xserver and mesa git update 28-12-2010

1 files changed, 1354 insertions, 1194 deletions

diff --git a/mesalib/src/glsl/ir_constant_expression.cpp b/mesalib/src/glsl/ir_constant_expression.cpp
index 61a708f6e..53162f127 100644
--- a/mesalib/src/glsl/ir_constant_expression.cpp
+++ b/mesalib/src/glsl/ir_constant_expression.cpp
@@ -1,1194 +1,1354 @@
-/*
- * Copyright © 2010 Intel Corporation
- *
- * Permission is hereby granted, free of charge, to any person obtaining a
- * copy of this software and associated documentation files (the "Software"),
- * to deal in the Software without restriction, including without limitation
- * the rights to use, copy, modify, merge, publish, distribute, sublicense,
- * and/or sell copies of the Software, and to permit persons to whom the
- * Software is furnished to do so, subject to the following conditions:
- *
- * The above copyright notice and this permission notice (including the next
- * paragraph) shall be included in all copies or substantial portions of the
- * Software.
- *
- * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
- * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
- * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL
- * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
- * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
- * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
- * DEALINGS IN THE SOFTWARE.
- */
-
-/**
- * \file ir_constant_expression.cpp
- * Evaluate and process constant valued expressions
- *
- * In GLSL, constant valued expressions are used in several places.  These
- * must be processed and evaluated very early in the compilation process.
- *
- *    * Sizes of arrays
- *    * Initializers for uniforms
- *    * Initializers for \c const variables
- */
-
-#include <math.h>
-#include "main/core.h" /* for MAX2, MIN2, CLAMP */
-#include "ir.h"
-#include "ir_visitor.h"
-#include "glsl_types.h"
-
-static float
-dot(ir_constant *op0, ir_constant *op1)
-{
-   assert(op0->type->is_float() && op1->type->is_float());
-
-   float result = 0;
-   for (unsigned c = 0; c < op0->type->components(); c++)
-      result += op0->value.f[c] * op1->value.f[c];
-
-   return result;
-}
-
-ir_constant *
-ir_expression::constant_expression_value()
-{
-   ir_constant *op[2] = { NULL, NULL };
-   ir_constant_data data;
-
-   memset(&data, 0, sizeof(data));
-
-   for (unsigned operand = 0; operand < this->get_num_operands(); operand++) {
-      op[operand] = this->operands[operand]->constant_expression_value();
-      if (!op[operand])
-	 return NULL;
-   }
-
-   if (op[1] != NULL)
-      assert(op[0]->type->base_type == op[1]->type->base_type);
-
-   bool op0_scalar = op[0]->type->is_scalar();
-   bool op1_scalar = op[1] != NULL && op[1]->type->is_scalar();
-
-   /* When iterating over a vector or matrix's components, we want to increase
-    * the loop counter.  However, for scalars, we want to stay at 0.
-    */
-   unsigned c0_inc = op0_scalar ? 0 : 1;
-   unsigned c1_inc = op1_scalar ? 0 : 1;
-   unsigned components;
-   if (op1_scalar || !op[1]) {
-      components = op[0]->type->components();
-   } else {
-      components = op[1]->type->components();
-   }
-
-   void *ctx = talloc_parent(this);
-
-   /* Handle array operations here, rather than below. */
-   if (op[0]->type->is_array()) {
-      assert(op[1] != NULL && op[1]->type->is_array());
-      switch (this->operation) {
-      case ir_binop_all_equal:
-	 return new(ctx) ir_constant(op[0]->has_value(op[1]));
-      case ir_binop_any_nequal:
-	 return new(ctx) ir_constant(!op[0]->has_value(op[1]));
-      default:
-	 break;
-      }
-      return NULL;
-   }
-
-   switch (this->operation) {
-   case ir_unop_logic_not:
-      assert(op[0]->type->base_type == GLSL_TYPE_BOOL);
-      for (unsigned c = 0; c < op[0]->type->components(); c++)
-	 data.b[c] = !op[0]->value.b[c];
-      break;
-
-   case ir_unop_f2i:
-      assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);
-      for (unsigned c = 0; c < op[0]->type->components(); c++) {
-	 data.i[c] = op[0]->value.f[c];
-      }
-      break;
-   case ir_unop_i2f:
-      assert(op[0]->type->base_type == GLSL_TYPE_INT);
-      for (unsigned c = 0; c < op[0]->type->components(); c++) {
-	 data.f[c] = op[0]->value.i[c];
-      }
-      break;
-   case ir_unop_u2f:
-      assert(op[0]->type->base_type == GLSL_TYPE_UINT);
-      for (unsigned c = 0; c < op[0]->type->components(); c++) {
-	 data.f[c] = op[0]->value.u[c];
-      }
-      break;
-   case ir_unop_b2f:
-      assert(op[0]->type->base_type == GLSL_TYPE_BOOL);
-      for (unsigned c = 0; c < op[0]->type->components(); c++) {
-	 data.f[c] = op[0]->value.b[c] ? 1.0 : 0.0;
-      }
-      break;
-   case ir_unop_f2b:
-      assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);
-      for (unsigned c = 0; c < op[0]->type->components(); c++) {
-	 data.b[c] = bool(op[0]->value.f[c]);
-      }
-      break;
-   case ir_unop_b2i:
-      assert(op[0]->type->base_type == GLSL_TYPE_BOOL);
-      for (unsigned c = 0; c < op[0]->type->components(); c++) {
-	 data.u[c] = op[0]->value.b[c] ? 1 : 0;
-      }
-      break;
-   case ir_unop_i2b:
-      assert(op[0]->type->is_integer());
-      for (unsigned c = 0; c < op[0]->type->components(); c++) {
-	 data.b[c] = bool(op[0]->value.u[c]);
-      }
-      break;
-
-   case ir_unop_any:
-      assert(op[0]->type->is_boolean());
-      data.b[0] = false;
-      for (unsigned c = 0; c < op[0]->type->components(); c++) {
-	 if (op[0]->value.b[c])
-	    data.b[0] = true;
-      }
-      break;
-
-   case ir_unop_trunc:
-      assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);
-      for (unsigned c = 0; c < op[0]->type->components(); c++) {
-	 data.f[c] = truncf(op[0]->value.f[c]);
-      }
-      break;
-
-   case ir_unop_ceil:
-      assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);
-      for (unsigned c = 0; c < op[0]->type->components(); c++) {
-	 data.f[c] = ceilf(op[0]->value.f[c]);
-      }
-      break;
-
-   case ir_unop_floor:
-      assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);
-      for (unsigned c = 0; c < op[0]->type->components(); c++) {
-	 data.f[c] = floorf(op[0]->value.f[c]);
-      }
-      break;
-
-   case ir_unop_fract:
-      for (unsigned c = 0; c < op[0]->type->components(); c++) {
-	 switch (this->type->base_type) {
-	 case GLSL_TYPE_UINT:
-	    data.u[c] = 0;
-	    break;
-	 case GLSL_TYPE_INT:
-	    data.i[c] = 0;
-	    break;
-	 case GLSL_TYPE_FLOAT:
-	    data.f[c] = op[0]->value.f[c] - floor(op[0]->value.f[c]);
-	    break;
-	 default:
-	    assert(0);
-	 }
-      }
-      break;
-
-   case ir_unop_sin:
-      assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);
-      for (unsigned c = 0; c < op[0]->type->components(); c++) {
-	 data.f[c] = sinf(op[0]->value.f[c]);
-      }
-      break;
-
-   case ir_unop_cos:
-      assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);
-      for (unsigned c = 0; c < op[0]->type->components(); c++) {
-	 data.f[c] = cosf(op[0]->value.f[c]);
-      }
-      break;
-
-   case ir_unop_neg:
-      for (unsigned c = 0; c < op[0]->type->components(); c++) {
-	 switch (this->type->base_type) {
-	 case GLSL_TYPE_UINT:
-	    data.u[c] = -op[0]->value.u[c];
-	    break;
-	 case GLSL_TYPE_INT:
-	    data.i[c] = -op[0]->value.i[c];
-	    break;
-	 case GLSL_TYPE_FLOAT:
-	    data.f[c] = -op[0]->value.f[c];
-	    break;
-	 default:
-	    assert(0);
-	 }
-      }
-      break;
-
-   case ir_unop_abs:
-      for (unsigned c = 0; c < op[0]->type->components(); c++) {
-	 switch (this->type->base_type) {
-	 case GLSL_TYPE_UINT:
-	    data.u[c] = op[0]->value.u[c];
-	    break;
-	 case GLSL_TYPE_INT:
-	    data.i[c] = op[0]->value.i[c];
-	    if (data.i[c] < 0)
-	       data.i[c] = -data.i[c];
-	    break;
-	 case GLSL_TYPE_FLOAT:
-	    data.f[c] = fabs(op[0]->value.f[c]);
-	    break;
-	 default:
-	    assert(0);
-	 }
-      }
-      break;
-
-   case ir_unop_sign:
-      for (unsigned c = 0; c < op[0]->type->components(); c++) {
-	 switch (this->type->base_type) {
-	 case GLSL_TYPE_UINT:
-	    data.u[c] = op[0]->value.i[c] > 0;
-	    break;
-	 case GLSL_TYPE_INT:
-	    data.i[c] = (op[0]->value.i[c] > 0) - (op[0]->value.i[c] < 0);
-	    break;
-	 case GLSL_TYPE_FLOAT:
-	    data.f[c] = float((op[0]->value.f[c] > 0)-(op[0]->value.f[c] < 0));
-	    break;
-	 default:
-	    assert(0);
-	 }
-      }
-      break;
-
-   case ir_unop_rcp:
-      assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);
-      for (unsigned c = 0; c < op[0]->type->components(); c++) {
-	 switch (this->type->base_type) {
-	 case GLSL_TYPE_UINT:
-	    if (op[0]->value.u[c] != 0.0)
-	       data.u[c] = 1 / op[0]->value.u[c];
-	    break;
-	 case GLSL_TYPE_INT:
-	    if (op[0]->value.i[c] != 0.0)
-	       data.i[c] = 1 / op[0]->value.i[c];
-	    break;
-	 case GLSL_TYPE_FLOAT:
-	    if (op[0]->value.f[c] != 0.0)
-	       data.f[c] = 1.0 / op[0]->value.f[c];
-	    break;
-	 default:
-	    assert(0);
-	 }
-      }
-      break;
-
-   case ir_unop_rsq:
-      assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);
-      for (unsigned c = 0; c < op[0]->type->components(); c++) {
-	 data.f[c] = 1.0 / sqrtf(op[0]->value.f[c]);
-      }
-      break;
-
-   case ir_unop_sqrt:
-      assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);
-      for (unsigned c = 0; c < op[0]->type->components(); c++) {
-	 data.f[c] = sqrtf(op[0]->value.f[c]);
-      }
-      break;
-
-   case ir_unop_exp:
-      assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);
-      for (unsigned c = 0; c < op[0]->type->components(); c++) {
-	 data.f[c] = expf(op[0]->value.f[c]);
-      }
-      break;
-
-   case ir_unop_exp2:
-      assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);
-      for (unsigned c = 0; c < op[0]->type->components(); c++) {
-	 data.f[c] = exp2f(op[0]->value.f[c]);
-      }
-      break;
-
-   case ir_unop_log:
-      assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);
-      for (unsigned c = 0; c < op[0]->type->components(); c++) {
-	 data.f[c] = logf(op[0]->value.f[c]);
-      }
-      break;
-
-   case ir_unop_log2:
-      assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);
-      for (unsigned c = 0; c < op[0]->type->components(); c++) {
-	 data.f[c] = log2f(op[0]->value.f[c]);
-      }
-      break;
-
-   case ir_unop_dFdx:
-   case ir_unop_dFdy:
-      assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);
-      for (unsigned c = 0; c < op[0]->type->components(); c++) {
-	 data.f[c] = 0.0;
-      }
-      break;
-
-   case ir_binop_pow:
-      assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);
-      for (unsigned c = 0; c < op[0]->type->components(); c++) {
-	 data.f[c] = powf(op[0]->value.f[c], op[1]->value.f[c]);
-      }
-      break;
-
-   case ir_binop_dot:
-      data.f[0] = dot(op[0], op[1]);
-      break;
-
-   case ir_binop_min:
-      assert(op[0]->type == op[1]->type || op0_scalar || op1_scalar);
-      for (unsigned c = 0, c0 = 0, c1 = 0;
-	   c < components;
-	   c0 += c0_inc, c1 += c1_inc, c++) {
-
-	 switch (op[0]->type->base_type) {
-	 case GLSL_TYPE_UINT:
-	    data.u[c] = MIN2(op[0]->value.u[c0], op[1]->value.u[c1]);
-	    break;
-	 case GLSL_TYPE_INT:
-	    data.i[c] = MIN2(op[0]->value.i[c0], op[1]->value.i[c1]);
-	    break;
-	 case GLSL_TYPE_FLOAT:
-	    data.f[c] = MIN2(op[0]->value.f[c0], op[1]->value.f[c1]);
-	    break;
-	 default:
-	    assert(0);
-	 }
-      }
-
-      break;
-   case ir_binop_max:
-      assert(op[0]->type == op[1]->type || op0_scalar || op1_scalar);
-      for (unsigned c = 0, c0 = 0, c1 = 0;
-	   c < components;
-	   c0 += c0_inc, c1 += c1_inc, c++) {
-
-	 switch (op[0]->type->base_type) {
-	 case GLSL_TYPE_UINT:
-	    data.u[c] = MAX2(op[0]->value.u[c0], op[1]->value.u[c1]);
-	    break;
-	 case GLSL_TYPE_INT:
-	    data.i[c] = MAX2(op[0]->value.i[c0], op[1]->value.i[c1]);
-	    break;
-	 case GLSL_TYPE_FLOAT:
-	    data.f[c] = MAX2(op[0]->value.f[c0], op[1]->value.f[c1]);
-	    break;
-	 default:
-	    assert(0);
-	 }
-      }
-      break;
-
-   case ir_binop_cross:
-      assert(op[0]->type == glsl_type::vec3_type);
-      assert(op[1]->type == glsl_type::vec3_type);
-      data.f[0] = (op[0]->value.f[1] * op[1]->value.f[2] -
-		   op[1]->value.f[1] * op[0]->value.f[2]);
-      data.f[1] = (op[0]->value.f[2] * op[1]->value.f[0] -
-		   op[1]->value.f[2] * op[0]->value.f[0]);
-      data.f[2] = (op[0]->value.f[0] * op[1]->value.f[1] -
-		   op[1]->value.f[0] * op[0]->value.f[1]);
-      break;
-
-   case ir_binop_add:
-      assert(op[0]->type == op[1]->type || op0_scalar || op1_scalar);
-      for (unsigned c = 0, c0 = 0, c1 = 0;
-	   c < components;
-	   c0 += c0_inc, c1 += c1_inc, c++) {
-
-	 switch (op[0]->type->base_type) {
-	 case GLSL_TYPE_UINT:
-	    data.u[c] = op[0]->value.u[c0] + op[1]->value.u[c1];
-	    break;
-	 case GLSL_TYPE_INT:
-	    data.i[c] = op[0]->value.i[c0] + op[1]->value.i[c1];
-	    break;
-	 case GLSL_TYPE_FLOAT:
-	    data.f[c] = op[0]->value.f[c0] + op[1]->value.f[c1];
-	    break;
-	 default:
-	    assert(0);
-	 }
-      }
-
-      break;
-   case ir_binop_sub:
-      assert(op[0]->type == op[1]->type || op0_scalar || op1_scalar);
-      for (unsigned c = 0, c0 = 0, c1 = 0;
-	   c < components;
-	   c0 += c0_inc, c1 += c1_inc, c++) {
-
-	 switch (op[0]->type->base_type) {
-	 case GLSL_TYPE_UINT:
-	    data.u[c] = op[0]->value.u[c0] - op[1]->value.u[c1];
-	    break;
-	 case GLSL_TYPE_INT:
-	    data.i[c] = op[0]->value.i[c0] - op[1]->value.i[c1];
-	    break;
-	 case GLSL_TYPE_FLOAT:
-	    data.f[c] = op[0]->value.f[c0] - op[1]->value.f[c1];
-	    break;
-	 default:
-	    assert(0);
-	 }
-      }
-
-      break;
-   case ir_binop_mul:
-      /* Check for equal types, or unequal types involving scalars */
-      if ((op[0]->type == op[1]->type && !op[0]->type->is_matrix())
-	  || op0_scalar || op1_scalar) {
-	 for (unsigned c = 0, c0 = 0, c1 = 0;
-	      c < components;
-	      c0 += c0_inc, c1 += c1_inc, c++) {
-
-	    switch (op[0]->type->base_type) {
-	    case GLSL_TYPE_UINT:
-	       data.u[c] = op[0]->value.u[c0] * op[1]->value.u[c1];
-	       break;
-	    case GLSL_TYPE_INT:
-	       data.i[c] = op[0]->value.i[c0] * op[1]->value.i[c1];
-	       break;
-	    case GLSL_TYPE_FLOAT:
-	       data.f[c] = op[0]->value.f[c0] * op[1]->value.f[c1];
-	       break;
-	    default:
-	       assert(0);
-	    }
-	 }
-      } else {
-	 assert(op[0]->type->is_matrix() || op[1]->type->is_matrix());
-
-	 /* Multiply an N-by-M matrix with an M-by-P matrix.  Since either
-	  * matrix can be a GLSL vector, either N or P can be 1.
-	  *
-	  * For vec*mat, the vector is treated as a row vector.  This
-	  * means the vector is a 1-row x M-column matrix.
-	  *
-	  * For mat*vec, the vector is treated as a column vector.  Since
-	  * matrix_columns is 1 for vectors, this just works.
-	  */
-	 const unsigned n = op[0]->type->is_vector()
-	    ? 1 : op[0]->type->vector_elements;
-	 const unsigned m = op[1]->type->vector_elements;
-	 const unsigned p = op[1]->type->matrix_columns;
-	 for (unsigned j = 0; j < p; j++) {
-	    for (unsigned i = 0; i < n; i++) {
-	       for (unsigned k = 0; k < m; k++) {
-		  data.f[i+n*j] += op[0]->value.f[i+n*k]*op[1]->value.f[k+m*j];
-	       }
-	    }
-	 }
-      }
-
-      break;
-   case ir_binop_div:
-      assert(op[0]->type == op[1]->type || op0_scalar || op1_scalar);
-      for (unsigned c = 0, c0 = 0, c1 = 0;
-	   c < components;
-	   c0 += c0_inc, c1 += c1_inc, c++) {
-
-	 switch (op[0]->type->base_type) {
-	 case GLSL_TYPE_UINT:
-	    data.u[c] = op[0]->value.u[c0] / op[1]->value.u[c1];
-	    break;
-	 case GLSL_TYPE_INT:
-	    data.i[c] = op[0]->value.i[c0] / op[1]->value.i[c1];
-	    break;
-	 case GLSL_TYPE_FLOAT:
-	    data.f[c] = op[0]->value.f[c0] / op[1]->value.f[c1];
-	    break;
-	 default:
-	    assert(0);
-	 }
-      }
-
-      break;
-   case ir_binop_mod:
-      assert(op[0]->type == op[1]->type || op0_scalar || op1_scalar);
-      for (unsigned c = 0, c0 = 0, c1 = 0;
-	   c < components;
-	   c0 += c0_inc, c1 += c1_inc, c++) {
-
-	 switch (op[0]->type->base_type) {
-	 case GLSL_TYPE_UINT:
-	    data.u[c] = op[0]->value.u[c0] % op[1]->value.u[c1];
-	    break;
-	 case GLSL_TYPE_INT:
-	    data.i[c] = op[0]->value.i[c0] % op[1]->value.i[c1];
-	    break;
-	 case GLSL_TYPE_FLOAT:
-	    /* We don't use fmod because it rounds toward zero; GLSL specifies
-	     * the use of floor.
-	     */
-	    data.f[c] = op[0]->value.f[c0] - op[1]->value.f[c1]
-	       * floorf(op[0]->value.f[c0] / op[1]->value.f[c1]);
-	    break;
-	 default:
-	    assert(0);
-	 }
-      }
-
-      break;
-
-   case ir_binop_logic_and:
-      assert(op[0]->type->base_type == GLSL_TYPE_BOOL);
-      for (unsigned c = 0; c < op[0]->type->components(); c++)
-	 data.b[c] = op[0]->value.b[c] && op[1]->value.b[c];
-      break;
-   case ir_binop_logic_xor:
-      assert(op[0]->type->base_type == GLSL_TYPE_BOOL);
-      for (unsigned c = 0; c < op[0]->type->components(); c++)
-	 data.b[c] = op[0]->value.b[c] ^ op[1]->value.b[c];
-      break;
-   case ir_binop_logic_or:
-      assert(op[0]->type->base_type == GLSL_TYPE_BOOL);
-      for (unsigned c = 0; c < op[0]->type->components(); c++)
-	 data.b[c] = op[0]->value.b[c] || op[1]->value.b[c];
-      break;
-
-   case ir_binop_less:
-      switch (op[0]->type->base_type) {
-      case GLSL_TYPE_UINT:
-	 data.b[0] = op[0]->value.u[0] < op[1]->value.u[0];
-	 break;
-      case GLSL_TYPE_INT:
-	 data.b[0] = op[0]->value.i[0] < op[1]->value.i[0];
-	 break;
-      case GLSL_TYPE_FLOAT:
-	 data.b[0] = op[0]->value.f[0] < op[1]->value.f[0];
-	 break;
-      default:
-	 assert(0);
-      }
-      break;
-   case ir_binop_greater:
-      switch (op[0]->type->base_type) {
-      case GLSL_TYPE_UINT:
-	 data.b[0] = op[0]->value.u[0] > op[1]->value.u[0];
-	 break;
-      case GLSL_TYPE_INT:
-	 data.b[0] = op[0]->value.i[0] > op[1]->value.i[0];
-	 break;
-      case GLSL_TYPE_FLOAT:
-	 data.b[0] = op[0]->value.f[0] > op[1]->value.f[0];
-	 break;
-      default:
-	 assert(0);
-      }
-      break;
-   case ir_binop_lequal:
-      switch (op[0]->type->base_type) {
-      case GLSL_TYPE_UINT:
-	 data.b[0] = op[0]->value.u[0] <= op[1]->value.u[0];
-	 break;
-      case GLSL_TYPE_INT:
-	 data.b[0] = op[0]->value.i[0] <= op[1]->value.i[0];
-	 break;
-      case GLSL_TYPE_FLOAT:
-	 data.b[0] = op[0]->value.f[0] <= op[1]->value.f[0];
-	 break;
-      default:
-	 assert(0);
-      }
-      break;
-   case ir_binop_gequal:
-      switch (op[0]->type->base_type) {
-      case GLSL_TYPE_UINT:
-	 data.b[0] = op[0]->value.u[0] >= op[1]->value.u[0];
-	 break;
-      case GLSL_TYPE_INT:
-	 data.b[0] = op[0]->value.i[0] >= op[1]->value.i[0];
-	 break;
-      case GLSL_TYPE_FLOAT:
-	 data.b[0] = op[0]->value.f[0] >= op[1]->value.f[0];
-	 break;
-      default:
-	 assert(0);
-      }
-      break;
-   case ir_binop_equal:
-      assert(op[0]->type == op[1]->type);
-      for (unsigned c = 0; c < components; c++) {
-	 switch (op[0]->type->base_type) {
-	 case GLSL_TYPE_UINT:
-	    data.b[c] = op[0]->value.u[c] == op[1]->value.u[c];
-	    break;
-	 case GLSL_TYPE_INT:
-	    data.b[c] = op[0]->value.i[c] == op[1]->value.i[c];
-	    break;
-	 case GLSL_TYPE_FLOAT:
-	    data.b[c] = op[0]->value.f[c] == op[1]->value.f[c];
-	    break;
-	 default:
-	    assert(0);
-	 }
-      }
-      break;
-   case ir_binop_nequal:
-      assert(op[0]->type != op[1]->type);
-      for (unsigned c = 0; c < components; c++) {
-	 switch (op[0]->type->base_type) {
-	 case GLSL_TYPE_UINT:
-	    data.b[c] = op[0]->value.u[c] != op[1]->value.u[c];
-	    break;
-	 case GLSL_TYPE_INT:
-	    data.b[c] = op[0]->value.i[c] != op[1]->value.i[c];
-	    break;
-	 case GLSL_TYPE_FLOAT:
-	    data.b[c] = op[0]->value.f[c] != op[1]->value.f[c];
-	    break;
-	 default:
-	    assert(0);
-	 }
-      }
-      break;
-   case ir_binop_all_equal:
-      data.b[0] = op[0]->has_value(op[1]);
-      break;
-   case ir_binop_any_nequal:
-      data.b[0] = !op[0]->has_value(op[1]);
-      break;
-
-   default:
-      /* FINISHME: Should handle all expression types. */
-      return NULL;
-   }
-
-   return new(ctx) ir_constant(this->type, &data);
-}
-
-
-ir_constant *
-ir_texture::constant_expression_value()
-{
-   /* texture lookups aren't constant expressions */
-   return NULL;
-}
-
-
-ir_constant *
-ir_swizzle::constant_expression_value()
-{
-   ir_constant *v = this->val->constant_expression_value();
-
-   if (v != NULL) {
-      ir_constant_data data = { { 0 } };
-
-      const unsigned swiz_idx[4] = {
-	 this->mask.x, this->mask.y, this->mask.z, this->mask.w
-      };
-
-      for (unsigned i = 0; i < this->mask.num_components; i++) {
-	 switch (v->type->base_type) {
-	 case GLSL_TYPE_UINT:
-	 case GLSL_TYPE_INT:   data.u[i] = v->value.u[swiz_idx[i]]; break;
-	 case GLSL_TYPE_FLOAT: data.f[i] = v->value.f[swiz_idx[i]]; break;
-	 case GLSL_TYPE_BOOL:  data.b[i] = v->value.b[swiz_idx[i]]; break;
-	 default:              assert(!"Should not get here."); break;
-	 }
-      }
-
-      void *ctx = talloc_parent(this);
-      return new(ctx) ir_constant(this->type, &data);
-   }
-   return NULL;
-}
-
-
-ir_constant *
-ir_dereference_variable::constant_expression_value()
-{
-   /* This may occur during compile and var->type is glsl_type::error_type */
-   if (!var)
-      return NULL;
-
-   /* The constant_value of a uniform variable is its initializer,
-    * not the lifetime constant value of the uniform.
-    */
-   if (var->mode == ir_var_uniform)
-      return NULL;
-
-   if (!var->constant_value)
-      return NULL;
-
-   return var->constant_value->clone(talloc_parent(var), NULL);
-}
-
-
-ir_constant *
-ir_dereference_array::constant_expression_value()
-{
-   ir_constant *array = this->array->constant_expression_value();
-   ir_constant *idx = this->array_index->constant_expression_value();
-
-   if ((array != NULL) && (idx != NULL)) {
-      void *ctx = talloc_parent(this);
-      if (array->type->is_matrix()) {
-	 /* Array access of a matrix results in a vector.
-	  */
-	 const unsigned column = idx->value.u[0];
-
-	 const glsl_type *const column_type = array->type->column_type();
-
-	 /* Offset in the constant matrix to the first element of the column
-	  * to be extracted.
-	  */
-	 const unsigned mat_idx = column * column_type->vector_elements;
-
-	 ir_constant_data data;
-
-	 switch (column_type->base_type) {
-	 case GLSL_TYPE_UINT:
-	 case GLSL_TYPE_INT:
-	    for (unsigned i = 0; i < column_type->vector_elements; i++)
-	       data.u[i] = array->value.u[mat_idx + i];
-
-	    break;
-
-	 case GLSL_TYPE_FLOAT:
-	    for (unsigned i = 0; i < column_type->vector_elements; i++)
-	       data.f[i] = array->value.f[mat_idx + i];
-
-	    break;
-
-	 default:
-	    assert(!"Should not get here.");
-	    break;
-	 }
-
-	 return new(ctx) ir_constant(column_type, &data);
-      } else if (array->type->is_vector()) {
-	 const unsigned component = idx->value.u[0];
-
-	 return new(ctx) ir_constant(array, component);
-      } else {
-	 const unsigned index = idx->value.u[0];
-	 return array->get_array_element(index)->clone(ctx, NULL);
-      }
-   }
-   return NULL;
-}
-
-
-ir_constant *
-ir_dereference_record::constant_expression_value()
-{
-   ir_constant *v = this->record->constant_expression_value();
-
-   return (v != NULL) ? v->get_record_field(this->field) : NULL;
-}
-
-
-ir_constant *
-ir_assignment::constant_expression_value()
-{
-   /* FINISHME: Handle CEs involving assignment (return RHS) */
-   return NULL;
-}
-
-
-ir_constant *
-ir_constant::constant_expression_value()
-{
-   return this;
-}
-
-
-ir_constant *
-ir_call::constant_expression_value()
-{
-   if (this->type == glsl_type::error_type)
-      return NULL;
-
-   /* From the GLSL 1.20 spec, page 23:
-    * "Function calls to user-defined functions (non-built-in functions)
-    *  cannot be used to form constant expressions."
-    */
-   if (!this->callee->is_builtin)
-      return NULL;
-
-   unsigned num_parameters = 0;
-
-   /* Check if all parameters are constant */
-   ir_constant *op[3];
-   foreach_list(n, &this->actual_parameters) {
-      ir_constant *constant = ((ir_rvalue *) n)->constant_expression_value();
-      if (constant == NULL)
-	 return NULL;
-
-      op[num_parameters] = constant;
-
-      assert(num_parameters < 3);
-      num_parameters++;
-   }
-
-   /* Individual cases below can either:
-    * - Assign "expr" a new ir_expression to evaluate (for basic opcodes)
-    * - Fill "data" with appopriate constant data
-    * - Return an ir_constant directly.
-    */
-   void *mem_ctx = talloc_parent(this);
-   ir_expression *expr = NULL;
-
-   ir_constant_data data;
-   memset(&data, 0, sizeof(data));
-
-   const char *callee = this->callee_name();
-   if (strcmp(callee, "abs") == 0) {
-      expr = new(mem_ctx) ir_expression(ir_unop_abs, type, op[0], NULL);
-   } else if (strcmp(callee, "all") == 0) {
-      assert(op[0]->type->is_boolean());
-      for (unsigned c = 0; c < op[0]->type->components(); c++) {
-	 if (!op[0]->value.b[c])
-	    return new(mem_ctx) ir_constant(false);
-      }
-      return new(mem_ctx) ir_constant(true);
-   } else if (strcmp(callee, "any") == 0) {
-      assert(op[0]->type->is_boolean());
-      for (unsigned c = 0; c < op[0]->type->components(); c++) {
-	 if (op[0]->value.b[c])
-	    return new(mem_ctx) ir_constant(true);
-      }
-      return new(mem_ctx) ir_constant(false);
-   } else if (strcmp(callee, "acos") == 0) {
-      assert(op[0]->type->is_float());
-      for (unsigned c = 0; c < op[0]->type->components(); c++)
-	 data.f[c] = acosf(op[0]->value.f[c]);
-   } else if (strcmp(callee, "asin") == 0) {
-      assert(op[0]->type->is_float());
-      for (unsigned c = 0; c < op[0]->type->components(); c++)
-	 data.f[c] = asinf(op[0]->value.f[c]);
-   } else if (strcmp(callee, "atan") == 0) {
-      assert(op[0]->type->is_float());
-      if (num_parameters == 2) {
-	 assert(op[1]->type->is_float());
-	 for (unsigned c = 0; c < op[0]->type->components(); c++)
-	    data.f[c] = atan2f(op[0]->value.f[c], op[1]->value.f[c]);
-      } else {
-	 for (unsigned c = 0; c < op[0]->type->components(); c++)
-	    data.f[c] = atanf(op[0]->value.f[c]);
-      }
-   } else if (strcmp(callee, "dFdx") == 0 || strcmp(callee, "dFdy") == 0) {
-      return ir_constant::zero(mem_ctx, this->type);
-   } else if (strcmp(callee, "ceil") == 0) {
-      expr = new(mem_ctx) ir_expression(ir_unop_ceil, type, op[0], NULL);
-   } else if (strcmp(callee, "clamp") == 0) {
-      assert(num_parameters == 3);
-      unsigned c1_inc = op[1]->type->is_scalar() ? 0 : 1;
-      unsigned c2_inc = op[2]->type->is_scalar() ? 0 : 1;
-      for (unsigned c = 0, c1 = 0, c2 = 0;
-	   c < op[0]->type->components();
-	   c1 += c1_inc, c2 += c2_inc, c++) {
-
-	 switch (op[0]->type->base_type) {
-	 case GLSL_TYPE_UINT:
-	    data.u[c] = CLAMP(op[0]->value.u[c], op[1]->value.u[c1],
-			      op[2]->value.u[c2]);
-	    break;
-	 case GLSL_TYPE_INT:
-	    data.i[c] = CLAMP(op[0]->value.i[c], op[1]->value.i[c1],
-			      op[2]->value.i[c2]);
-	    break;
-	 case GLSL_TYPE_FLOAT:
-	    data.f[c] = CLAMP(op[0]->value.f[c], op[1]->value.f[c1],
-			      op[2]->value.f[c2]);
-	    break;
-	 default:
-	    assert(!"Should not get here.");
-	 }
-      }
-   } else if (strcmp(callee, "cos") == 0) {
-      expr = new(mem_ctx) ir_expression(ir_unop_cos, type, op[0], NULL);
-   } else if (strcmp(callee, "cosh") == 0) {
-      assert(op[0]->type->is_float());
-      for (unsigned c = 0; c < op[0]->type->components(); c++)
-	 data.f[c] = coshf(op[0]->value.f[c]);
-   } else if (strcmp(callee, "cross") == 0) {
-      expr = new(mem_ctx) ir_expression(ir_binop_cross, type, op[0], op[1]);
-   } else if (strcmp(callee, "degrees") == 0) {
-      assert(op[0]->type->is_float());
-      for (unsigned c = 0; c < op[0]->type->components(); c++)
-	 data.f[c] = 180.0/M_PI * op[0]->value.f[c];
-   } else if (strcmp(callee, "distance") == 0) {
-      assert(op[0]->type->is_float() && op[1]->type->is_float());
-      float length_squared = 0.0;
-      for (unsigned c = 0; c < op[0]->type->components(); c++) {
-	 float t = op[0]->value.f[c] - op[1]->value.f[c];
-	 length_squared += t * t;
-      }
-      return new(mem_ctx) ir_constant(sqrtf(length_squared));
-   } else if (strcmp(callee, "dot") == 0) {
-      return new(mem_ctx) ir_constant(dot(op[0], op[1]));
-   } else if (strcmp(callee, "equal") == 0) {
-      assert(op[0]->type->is_vector() && op[1] && op[1]->type->is_vector());
-      for (unsigned c = 0; c < op[0]->type->components(); c++) {
-	 switch (op[0]->type->base_type) {
-	 case GLSL_TYPE_UINT:
-	    data.b[c] = op[0]->value.u[c] == op[1]->value.u[c];
-	    break;
-	 case GLSL_TYPE_INT:
-	    data.b[c] = op[0]->value.i[c] == op[1]->value.i[c];
-	    break;
-	 case GLSL_TYPE_FLOAT:
-	    data.b[c] = op[0]->value.f[c] == op[1]->value.f[c];
-	    break;
-	 case GLSL_TYPE_BOOL:
-	    data.b[c] = op[0]->value.b[c] == op[1]->value.b[c];
-	    break;
-	 default:
-	    assert(!"Should not get here.");
-	 }
-      }
-   } else if (strcmp(callee, "exp") == 0) {
-      expr = new(mem_ctx) ir_expression(ir_unop_exp, type, op[0], NULL);
-   } else if (strcmp(callee, "exp2") == 0) {
-      expr = new(mem_ctx) ir_expression(ir_unop_exp2, type, op[0], NULL);
-   } else if (strcmp(callee, "faceforward") == 0) {
-      if (dot(op[2], op[1]) < 0)
-	 return op[0];
-      for (unsigned c = 0; c < op[0]->type->components(); c++)
-	 data.f[c] = -op[0]->value.f[c];
-   } else if (strcmp(callee, "floor") == 0) {
-      expr = new(mem_ctx) ir_expression(ir_unop_floor, type, op[0], NULL);
-   } else if (strcmp(callee, "fract") == 0) {
-      expr = new(mem_ctx) ir_expression(ir_unop_fract, type, op[0], NULL);
-   } else if (strcmp(callee, "fwidth") == 0) {
-      return ir_constant::zero(mem_ctx, this->type);
-   } else if (strcmp(callee, "greaterThan") == 0) {
-      assert(op[0]->type->is_vector() && op[1] && op[1]->type->is_vector());
-      for (unsigned c = 0; c < op[0]->type->components(); c++) {
-	 switch (op[0]->type->base_type) {
-	 case GLSL_TYPE_UINT:
-	    data.b[c] = op[0]->value.u[c] > op[1]->value.u[c];
-	    break;
-	 case GLSL_TYPE_INT:
-	    data.b[c] = op[0]->value.i[c] > op[1]->value.i[c];
-	    break;
-	 case GLSL_TYPE_FLOAT:
-	    data.b[c] = op[0]->value.f[c] > op[1]->value.f[c];
-	    break;
-	 default:
-	    assert(!"Should not get here.");
-	 }
-      }
-   } else if (strcmp(callee, "greaterThanEqual") == 0) {
-      assert(op[0]->type->is_vector() && op[1] && op[1]->type->is_vector());
-      for (unsigned c = 0; c < op[0]->type->components(); c++) {
-	 switch (op[0]->type->base_type) {
-	 case GLSL_TYPE_UINT:
-	    data.b[c] = op[0]->value.u[c] >= op[1]->value.u[c];
-	    break;
-	 case GLSL_TYPE_INT:
-	    data.b[c] = op[0]->value.i[c] >= op[1]->value.i[c];
-	    break;
-	 case GLSL_TYPE_FLOAT:
-	    data.b[c] = op[0]->value.f[c] >= op[1]->value.f[c];
-	    break;
-	 default:
-	    assert(!"Should not get here.");
-	 }
-      }
-   } else if (strcmp(callee, "inversesqrt") == 0) {
-      expr = new(mem_ctx) ir_expression(ir_unop_rsq, type, op[0], NULL);
-   } else if (strcmp(callee, "length") == 0) {
-      return new(mem_ctx) ir_constant(sqrtf(dot(op[0], op[0])));
-   } else if (strcmp(callee, "lessThan") == 0) {
-      assert(op[0]->type->is_vector() && op[1] && op[1]->type->is_vector());
-      for (unsigned c = 0; c < op[0]->type->components(); c++) {
-	 switch (op[0]->type->base_type) {
-	 case GLSL_TYPE_UINT:
-	    data.b[c] = op[0]->value.u[c] < op[1]->value.u[c];
-	    break;
-	 case GLSL_TYPE_INT:
-	    data.b[c] = op[0]->value.i[c] < op[1]->value.i[c];
-	    break;
-	 case GLSL_TYPE_FLOAT:
-	    data.b[c] = op[0]->value.f[c] < op[1]->value.f[c];
-	    break;
-	 default:
-	    assert(!"Should not get here.");
-	 }
-      }
-   } else if (strcmp(callee, "lessThanEqual") == 0) {
-      assert(op[0]->type->is_vector() && op[1] && op[1]->type->is_vector());
-      for (unsigned c = 0; c < op[0]->type->components(); c++) {
-	 switch (op[0]->type->base_type) {
-	 case GLSL_TYPE_UINT:
-	    data.b[c] = op[0]->value.u[c] <= op[1]->value.u[c];
-	    break;
-	 case GLSL_TYPE_INT:
-	    data.b[c] = op[0]->value.i[c] <= op[1]->value.i[c];
-	    break;
-	 case GLSL_TYPE_FLOAT:
-	    data.b[c] = op[0]->value.f[c] <= op[1]->value.f[c];
-	    break;
-	 default:
-	    assert(!"Should not get here.");
-	 }
-      }
-   } else if (strcmp(callee, "log") == 0) {
-      expr = new(mem_ctx) ir_expression(ir_unop_log, type, op[0], NULL);
-   } else if (strcmp(callee, "log2") == 0) {
-      expr = new(mem_ctx) ir_expression(ir_unop_log2, type, op[0], NULL);
-   } else if (strcmp(callee, "matrixCompMult") == 0) {
-      assert(op[0]->type->is_float() && op[1]->type->is_float());
-      for (unsigned c = 0; c < op[0]->type->components(); c++)
-	 data.f[c] = op[0]->value.f[c] * op[1]->value.f[c];
-   } else if (strcmp(callee, "max") == 0) {
-      expr = new(mem_ctx) ir_expression(ir_binop_max, type, op[0], op[1]);
-   } else if (strcmp(callee, "min") == 0) {
-      expr = new(mem_ctx) ir_expression(ir_binop_min, type, op[0], op[1]);
-   } else if (strcmp(callee, "mix") == 0) {
-      assert(op[0]->type->is_float() && op[1]->type->is_float());
-      if (op[2]->type->is_float()) {
-	 unsigned c2_inc = op[2]->type->is_scalar() ? 0 : 1;
-	 unsigned components = op[0]->type->components();
-	 for (unsigned c = 0, c2 = 0; c < components; c2 += c2_inc, c++) {
-	    data.f[c] = op[0]->value.f[c] * (1 - op[2]->value.f[c2]) +
-			op[1]->value.f[c] * op[2]->value.f[c2];
-	 }
-      } else {
-	 assert(op[2]->type->is_boolean());
-	 for (unsigned c = 0; c < op[0]->type->components(); c++)
-	    data.f[c] = op[op[2]->value.b[c] ? 1 : 0]->value.f[c];
-      }
-   } else if (strcmp(callee, "mod") == 0) {
-      expr = new(mem_ctx) ir_expression(ir_binop_mod, type, op[0], op[1]);
-   } else if (strcmp(callee, "normalize") == 0) {
-      assert(op[0]->type->is_float());
-      float length = sqrtf(dot(op[0], op[0]));
-
-      if (length == 0)
-	 return ir_constant::zero(mem_ctx, this->type);
-
-      for (unsigned c = 0; c < op[0]->type->components(); c++)
-	 data.f[c] = op[0]->value.f[c] / length;
-   } else if (strcmp(callee, "not") == 0) {
-      expr = new(mem_ctx) ir_expression(ir_unop_logic_not, type, op[0], NULL);
-   } else if (strcmp(callee, "notEqual") == 0) {
-      assert(op[0]->type->is_vector() && op[1] && op[1]->type->is_vector());
-      for (unsigned c = 0; c < op[0]->type->components(); c++) {
-	 switch (op[0]->type->base_type) {
-	 case GLSL_TYPE_UINT:
-	    data.b[c] = op[0]->value.u[c] != op[1]->value.u[c];
-	    break;
-	 case GLSL_TYPE_INT:
-	    data.b[c] = op[0]->value.i[c] != op[1]->value.i[c];
-	    break;
-	 case GLSL_TYPE_FLOAT:
-	    data.b[c] = op[0]->value.f[c] != op[1]->value.f[c];
-	    break;
-	 case GLSL_TYPE_BOOL:
-	    data.b[c] = op[0]->value.b[c] != op[1]->value.b[c];
-	    break;
-	 default:
-	    assert(!"Should not get here.");
-	 }
-      }
-   } else if (strcmp(callee, "outerProduct") == 0) {
-      assert(op[0]->type->is_vector() && op[1]->type->is_vector());
-      const unsigned m = op[0]->type->vector_elements;
-      const unsigned n = op[1]->type->vector_elements;
-      for (unsigned j = 0; j < n; j++) {
-	 for (unsigned i = 0; i < m; i++) {
-	    data.f[i+m*j] = op[0]->value.f[i] * op[1]->value.f[j];
-	 }
-      }
-   } else if (strcmp(callee, "pow") == 0) {
-      expr = new(mem_ctx) ir_expression(ir_binop_pow, type, op[0], op[1]);
-   } else if (strcmp(callee, "radians") == 0) {
-      assert(op[0]->type->is_float());
-      for (unsigned c = 0; c < op[0]->type->components(); c++)
-	 data.f[c] = M_PI/180.0 * op[0]->value.f[c];
-   } else if (strcmp(callee, "reflect") == 0) {
-      assert(op[0]->type->is_float());
-      float dot_NI = dot(op[1], op[0]);
-      for (unsigned c = 0; c < op[0]->type->components(); c++)
-	 data.f[c] = op[0]->value.f[c] - 2 * dot_NI * op[1]->value.f[c];
-   } else if (strcmp(callee, "refract") == 0) {
-      const float eta = op[2]->value.f[0];
-      const float dot_NI = dot(op[1], op[0]);
-      const float k = 1.0 - eta * eta * (1.0 - dot_NI * dot_NI);
-      if (k < 0.0) {
-	 return ir_constant::zero(mem_ctx, this->type);
-      } else {
-	 for (unsigned c = 0; c < type->components(); c++) {
-	    data.f[c] = eta * op[0]->value.f[c] - (eta * dot_NI + sqrtf(k))
-			    * op[1]->value.f[c];
-	 }
-      }
-   } else if (strcmp(callee, "sign") == 0) {
-      expr = new(mem_ctx) ir_expression(ir_unop_sign, type, op[0], NULL);
-   } else if (strcmp(callee, "sin") == 0) {
-      expr = new(mem_ctx) ir_expression(ir_unop_sin, type, op[0], NULL);
-   } else if (strcmp(callee, "sinh") == 0) {
-      assert(op[0]->type->is_float());
-      for (unsigned c = 0; c < op[0]->type->components(); c++)
-	 data.f[c] = sinhf(op[0]->value.f[c]);
-   } else if (strcmp(callee, "smoothstep") == 0) {
-      assert(num_parameters == 3);
-      assert(op[1]->type == op[0]->type);
-      unsigned edge_inc = op[0]->type->is_scalar() ? 0 : 1;
-      for (unsigned c = 0, e = 0; c < type->components(); e += edge_inc, c++) {
-	 const float edge0 = op[0]->value.f[e];
-	 const float edge1 = op[1]->value.f[e];
-	 if (edge0 == edge1) {
-	    data.f[c] = 0.0; /* Avoid a crash - results are undefined anyway */
-	 } else {
-	    const float numerator = op[2]->value.f[c] - edge0;
-	    const float denominator = edge1 - edge0;
-	    const float t = CLAMP(numerator/denominator, 0, 1);
-	    data.f[c] = t * t * (3 - 2 * t);
-	 }
-      }
-   } else if (strcmp(callee, "sqrt") == 0) {
-      expr = new(mem_ctx) ir_expression(ir_unop_sqrt, type, op[0], NULL);
-   } else if (strcmp(callee, "step") == 0) {
-      assert(op[0]->type->is_float() && op[1]->type->is_float());
-      /* op[0] (edge) may be either a scalar or a vector */
-      const unsigned c0_inc = op[0]->type->is_scalar() ? 0 : 1;
-      for (unsigned c = 0, c0 = 0; c < type->components(); c0 += c0_inc, c++)
-	 data.f[c] = (op[1]->value.f[c] < op[0]->value.f[c0]) ? 0.0 : 1.0;
-   } else if (strcmp(callee, "tan") == 0) {
-      assert(op[0]->type->is_float());
-      for (unsigned c = 0; c < op[0]->type->components(); c++)
-	 data.f[c] = tanf(op[0]->value.f[c]);
-   } else if (strcmp(callee, "tanh") == 0) {
-      assert(op[0]->type->is_float());
-      for (unsigned c = 0; c < op[0]->type->components(); c++)
-	 data.f[c] = tanhf(op[0]->value.f[c]);
-   } else if (strcmp(callee, "transpose") == 0) {
-      assert(op[0]->type->is_matrix());
-      const unsigned n = op[0]->type->vector_elements;
-      const unsigned m = op[0]->type->matrix_columns;
-      for (unsigned j = 0; j < m; j++) {
-	 for (unsigned i = 0; i < n; i++) {
-	    data.f[m*i+j] += op[0]->value.f[i+n*j];
-	 }
-      }
-   } else {
-      /* Unsupported builtin - some are not allowed in constant expressions. */
-      return NULL;
-   }
-
-   if (expr != NULL)
-      return expr->constant_expression_value();
-
-   return new(mem_ctx) ir_constant(this->type, &data);
-}
+/*

+ * Copyright © 2010 Intel Corporation

+ *

+ * Permission is hereby granted, free of charge, to any person obtaining a

+ * copy of this software and associated documentation files (the "Software"),

+ * to deal in the Software without restriction, including without limitation

+ * the rights to use, copy, modify, merge, publish, distribute, sublicense,

+ * and/or sell copies of the Software, and to permit persons to whom the

+ * Software is furnished to do so, subject to the following conditions:

+ *

+ * The above copyright notice and this permission notice (including the next

+ * paragraph) shall be included in all copies or substantial portions of the

+ * Software.

+ *

+ * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR

+ * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,

+ * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.  IN NO EVENT SHALL

+ * THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER

+ * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING

+ * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER

+ * DEALINGS IN THE SOFTWARE.

+ */

+

+/**

+ * \file ir_constant_expression.cpp

+ * Evaluate and process constant valued expressions

+ *

+ * In GLSL, constant valued expressions are used in several places.  These

+ * must be processed and evaluated very early in the compilation process.

+ *

+ *    * Sizes of arrays

+ *    * Initializers for uniforms

+ *    * Initializers for \c const variables

+ */

+

+#include <math.h>

+#include "main/core.h" /* for MAX2, MIN2, CLAMP */

+#include "ir.h"

+#include "ir_visitor.h"

+#include "glsl_types.h"

+

+static float

+dot(ir_constant *op0, ir_constant *op1)

+{

+   assert(op0->type->is_float() && op1->type->is_float());

+

+   float result = 0;

+   for (unsigned c = 0; c < op0->type->components(); c++)

+      result += op0->value.f[c] * op1->value.f[c];

+

+   return result;

+}

+

+ir_constant *

+ir_expression::constant_expression_value()

+{

+   if (this->type->is_error())

+      return NULL;

+

+   ir_constant *op[Elements(this->operands)] = { NULL, };

+   ir_constant_data data;

+

+   memset(&data, 0, sizeof(data));

+

+   for (unsigned operand = 0; operand < this->get_num_operands(); operand++) {

+      op[operand] = this->operands[operand]->constant_expression_value();

+      if (!op[operand])

+	 return NULL;

+   }

+

+   if (op[1] != NULL)

+      assert(op[0]->type->base_type == op[1]->type->base_type);

+

+   bool op0_scalar = op[0]->type->is_scalar();

+   bool op1_scalar = op[1] != NULL && op[1]->type->is_scalar();

+

+   /* When iterating over a vector or matrix's components, we want to increase

+    * the loop counter.  However, for scalars, we want to stay at 0.

+    */

+   unsigned c0_inc = op0_scalar ? 0 : 1;

+   unsigned c1_inc = op1_scalar ? 0 : 1;

+   unsigned components;

+   if (op1_scalar || !op[1]) {

+      components = op[0]->type->components();

+   } else {

+      components = op[1]->type->components();

+   }

+

+   void *ctx = talloc_parent(this);

+

+   /* Handle array operations here, rather than below. */

+   if (op[0]->type->is_array()) {

+      assert(op[1] != NULL && op[1]->type->is_array());

+      switch (this->operation) {

+      case ir_binop_all_equal:

+	 return new(ctx) ir_constant(op[0]->has_value(op[1]));

+      case ir_binop_any_nequal:

+	 return new(ctx) ir_constant(!op[0]->has_value(op[1]));

+      default:

+	 break;

+      }

+      return NULL;

+   }

+

+   switch (this->operation) {

+   case ir_unop_bit_not:

+       switch (op[0]->type->base_type) {

+       case GLSL_TYPE_INT:

+           for (unsigned c = 0; c < components; c++)

+               data.i[c] = ~ op[0]->value.i[c];

+           break;

+       case GLSL_TYPE_UINT:

+           for (unsigned c = 0; c < components; c++)

+               data.u[c] = ~ op[0]->value.u[c];

+           break;

+       default:

+           assert(0);

+       }

+       break;

+

+   case ir_unop_logic_not:

+      assert(op[0]->type->base_type == GLSL_TYPE_BOOL);

+      for (unsigned c = 0; c < op[0]->type->components(); c++)

+	 data.b[c] = !op[0]->value.b[c];

+      break;

+

+   case ir_unop_f2i:

+      assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);

+      for (unsigned c = 0; c < op[0]->type->components(); c++) {

+	 data.i[c] = (int) op[0]->value.f[c];

+      }

+      break;

+   case ir_unop_i2f:

+      assert(op[0]->type->base_type == GLSL_TYPE_INT);

+      for (unsigned c = 0; c < op[0]->type->components(); c++) {

+	 data.f[c] = (float) op[0]->value.i[c];

+      }

+      break;

+   case ir_unop_u2f:

+      assert(op[0]->type->base_type == GLSL_TYPE_UINT);

+      for (unsigned c = 0; c < op[0]->type->components(); c++) {

+	 data.f[c] = (float) op[0]->value.u[c];

+      }

+      break;

+   case ir_unop_b2f:

+      assert(op[0]->type->base_type == GLSL_TYPE_BOOL);

+      for (unsigned c = 0; c < op[0]->type->components(); c++) {

+	 data.f[c] = op[0]->value.b[c] ? 1.0F : 0.0F;

+      }

+      break;

+   case ir_unop_f2b:

+      assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);

+      for (unsigned c = 0; c < op[0]->type->components(); c++) {

+	 data.b[c] = op[0]->value.f[c] != 0.0F ? true : false;

+      }

+      break;

+   case ir_unop_b2i:

+      assert(op[0]->type->base_type == GLSL_TYPE_BOOL);

+      for (unsigned c = 0; c < op[0]->type->components(); c++) {

+	 data.u[c] = op[0]->value.b[c] ? 1 : 0;

+      }

+      break;

+   case ir_unop_i2b:

+      assert(op[0]->type->is_integer());

+      for (unsigned c = 0; c < op[0]->type->components(); c++) {

+	 data.b[c] = op[0]->value.u[c] ? true : false;

+      }

+      break;

+

+   case ir_unop_any:

+      assert(op[0]->type->is_boolean());

+      data.b[0] = false;

+      for (unsigned c = 0; c < op[0]->type->components(); c++) {

+	 if (op[0]->value.b[c])

+	    data.b[0] = true;

+      }

+      break;

+

+   case ir_unop_trunc:

+      assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);

+      for (unsigned c = 0; c < op[0]->type->components(); c++) {

+	 data.f[c] = truncf(op[0]->value.f[c]);

+      }

+      break;

+

+   case ir_unop_ceil:

+      assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);

+      for (unsigned c = 0; c < op[0]->type->components(); c++) {

+	 data.f[c] = ceilf(op[0]->value.f[c]);

+      }

+      break;

+

+   case ir_unop_floor:

+      assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);

+      for (unsigned c = 0; c < op[0]->type->components(); c++) {

+	 data.f[c] = floorf(op[0]->value.f[c]);

+      }

+      break;

+

+   case ir_unop_fract:

+      for (unsigned c = 0; c < op[0]->type->components(); c++) {

+	 switch (this->type->base_type) {

+	 case GLSL_TYPE_UINT:

+	    data.u[c] = 0;

+	    break;

+	 case GLSL_TYPE_INT:

+	    data.i[c] = 0;

+	    break;

+	 case GLSL_TYPE_FLOAT:

+	    data.f[c] = op[0]->value.f[c] - floor(op[0]->value.f[c]);

+	    break;

+	 default:

+	    assert(0);

+	 }

+      }

+      break;

+

+   case ir_unop_sin:

+   case ir_unop_sin_reduced:

+      assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);

+      for (unsigned c = 0; c < op[0]->type->components(); c++) {

+	 data.f[c] = sinf(op[0]->value.f[c]);

+      }

+      break;

+

+   case ir_unop_cos:

+   case ir_unop_cos_reduced:

+      assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);

+      for (unsigned c = 0; c < op[0]->type->components(); c++) {

+	 data.f[c] = cosf(op[0]->value.f[c]);

+      }

+      break;

+

+   case ir_unop_neg:

+      for (unsigned c = 0; c < op[0]->type->components(); c++) {

+	 switch (this->type->base_type) {

+	 case GLSL_TYPE_UINT:

+	    data.u[c] = -((int) op[0]->value.u[c]);

+	    break;

+	 case GLSL_TYPE_INT:

+	    data.i[c] = -op[0]->value.i[c];

+	    break;

+	 case GLSL_TYPE_FLOAT:

+	    data.f[c] = -op[0]->value.f[c];

+	    break;

+	 default:

+	    assert(0);

+	 }

+      }

+      break;

+

+   case ir_unop_abs:

+      for (unsigned c = 0; c < op[0]->type->components(); c++) {

+	 switch (this->type->base_type) {

+	 case GLSL_TYPE_UINT:

+	    data.u[c] = op[0]->value.u[c];

+	    break;

+	 case GLSL_TYPE_INT:

+	    data.i[c] = op[0]->value.i[c];

+	    if (data.i[c] < 0)

+	       data.i[c] = -data.i[c];

+	    break;

+	 case GLSL_TYPE_FLOAT:

+	    data.f[c] = fabs(op[0]->value.f[c]);

+	    break;

+	 default:

+	    assert(0);

+	 }

+      }

+      break;

+

+   case ir_unop_sign:

+      for (unsigned c = 0; c < op[0]->type->components(); c++) {

+	 switch (this->type->base_type) {

+	 case GLSL_TYPE_UINT:

+	    data.u[c] = op[0]->value.i[c] > 0;

+	    break;

+	 case GLSL_TYPE_INT:

+	    data.i[c] = (op[0]->value.i[c] > 0) - (op[0]->value.i[c] < 0);

+	    break;

+	 case GLSL_TYPE_FLOAT:

+	    data.f[c] = float((op[0]->value.f[c] > 0)-(op[0]->value.f[c] < 0));

+	    break;

+	 default:

+	    assert(0);

+	 }

+      }

+      break;

+

+   case ir_unop_rcp:

+      assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);

+      for (unsigned c = 0; c < op[0]->type->components(); c++) {

+	 switch (this->type->base_type) {

+	 case GLSL_TYPE_UINT:

+	    if (op[0]->value.u[c] != 0.0)

+	       data.u[c] = 1 / op[0]->value.u[c];

+	    break;

+	 case GLSL_TYPE_INT:

+	    if (op[0]->value.i[c] != 0.0)

+	       data.i[c] = 1 / op[0]->value.i[c];

+	    break;

+	 case GLSL_TYPE_FLOAT:

+	    if (op[0]->value.f[c] != 0.0)

+	       data.f[c] = 1.0F / op[0]->value.f[c];

+	    break;

+	 default:

+	    assert(0);

+	 }

+      }

+      break;

+

+   case ir_unop_rsq:

+      assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);

+      for (unsigned c = 0; c < op[0]->type->components(); c++) {

+	 data.f[c] = 1.0F / sqrtf(op[0]->value.f[c]);

+      }

+      break;

+

+   case ir_unop_sqrt:

+      assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);

+      for (unsigned c = 0; c < op[0]->type->components(); c++) {

+	 data.f[c] = sqrtf(op[0]->value.f[c]);

+      }

+      break;

+

+   case ir_unop_exp:

+      assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);

+      for (unsigned c = 0; c < op[0]->type->components(); c++) {

+	 data.f[c] = expf(op[0]->value.f[c]);

+      }

+      break;

+

+   case ir_unop_exp2:

+      assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);

+      for (unsigned c = 0; c < op[0]->type->components(); c++) {

+	 data.f[c] = exp2f(op[0]->value.f[c]);

+      }

+      break;

+

+   case ir_unop_log:

+      assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);

+      for (unsigned c = 0; c < op[0]->type->components(); c++) {

+	 data.f[c] = logf(op[0]->value.f[c]);

+      }

+      break;

+

+   case ir_unop_log2:

+      assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);

+      for (unsigned c = 0; c < op[0]->type->components(); c++) {

+	 data.f[c] = log2f(op[0]->value.f[c]);

+      }

+      break;

+

+   case ir_unop_dFdx:

+   case ir_unop_dFdy:

+      assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);

+      for (unsigned c = 0; c < op[0]->type->components(); c++) {

+	 data.f[c] = 0.0;

+      }

+      break;

+

+   case ir_binop_pow:

+      assert(op[0]->type->base_type == GLSL_TYPE_FLOAT);

+      for (unsigned c = 0; c < op[0]->type->components(); c++) {

+	 data.f[c] = powf(op[0]->value.f[c], op[1]->value.f[c]);

+      }

+      break;

+

+   case ir_binop_dot:

+      data.f[0] = dot(op[0], op[1]);

+      break;

+

+   case ir_binop_min:

+      assert(op[0]->type == op[1]->type || op0_scalar || op1_scalar);

+      for (unsigned c = 0, c0 = 0, c1 = 0;

+	   c < components;

+	   c0 += c0_inc, c1 += c1_inc, c++) {

+

+	 switch (op[0]->type->base_type) {

+	 case GLSL_TYPE_UINT:

+	    data.u[c] = MIN2(op[0]->value.u[c0], op[1]->value.u[c1]);

+	    break;

+	 case GLSL_TYPE_INT:

+	    data.i[c] = MIN2(op[0]->value.i[c0], op[1]->value.i[c1]);

+	    break;

+	 case GLSL_TYPE_FLOAT:

+	    data.f[c] = MIN2(op[0]->value.f[c0], op[1]->value.f[c1]);

+	    break;

+	 default:

+	    assert(0);

+	 }

+      }

+

+      break;

+   case ir_binop_max:

+      assert(op[0]->type == op[1]->type || op0_scalar || op1_scalar);

+      for (unsigned c = 0, c0 = 0, c1 = 0;

+	   c < components;

+	   c0 += c0_inc, c1 += c1_inc, c++) {

+

+	 switch (op[0]->type->base_type) {

+	 case GLSL_TYPE_UINT:

+	    data.u[c] = MAX2(op[0]->value.u[c0], op[1]->value.u[c1]);

+	    break;

+	 case GLSL_TYPE_INT:

+	    data.i[c] = MAX2(op[0]->value.i[c0], op[1]->value.i[c1]);

+	    break;

+	 case GLSL_TYPE_FLOAT:

+	    data.f[c] = MAX2(op[0]->value.f[c0], op[1]->value.f[c1]);

+	    break;

+	 default:

+	    assert(0);

+	 }

+      }

+      break;

+

+   case ir_binop_add:

+      assert(op[0]->type == op[1]->type || op0_scalar || op1_scalar);

+      for (unsigned c = 0, c0 = 0, c1 = 0;

+	   c < components;

+	   c0 += c0_inc, c1 += c1_inc, c++) {

+

+	 switch (op[0]->type->base_type) {

+	 case GLSL_TYPE_UINT:

+	    data.u[c] = op[0]->value.u[c0] + op[1]->value.u[c1];

+	    break;

+	 case GLSL_TYPE_INT:

+	    data.i[c] = op[0]->value.i[c0] + op[1]->value.i[c1];

+	    break;

+	 case GLSL_TYPE_FLOAT:

+	    data.f[c] = op[0]->value.f[c0] + op[1]->value.f[c1];

+	    break;

+	 default:

+	    assert(0);

+	 }

+      }

+

+      break;

+   case ir_binop_sub:

+      assert(op[0]->type == op[1]->type || op0_scalar || op1_scalar);

+      for (unsigned c = 0, c0 = 0, c1 = 0;

+	   c < components;

+	   c0 += c0_inc, c1 += c1_inc, c++) {

+

+	 switch (op[0]->type->base_type) {

+	 case GLSL_TYPE_UINT:

+	    data.u[c] = op[0]->value.u[c0] - op[1]->value.u[c1];

+	    break;

+	 case GLSL_TYPE_INT:

+	    data.i[c] = op[0]->value.i[c0] - op[1]->value.i[c1];

+	    break;

+	 case GLSL_TYPE_FLOAT:

+	    data.f[c] = op[0]->value.f[c0] - op[1]->value.f[c1];

+	    break;

+	 default:

+	    assert(0);

+	 }

+      }

+

+      break;

+   case ir_binop_mul:

+      /* Check for equal types, or unequal types involving scalars */

+      if ((op[0]->type == op[1]->type && !op[0]->type->is_matrix())

+	  || op0_scalar || op1_scalar) {

+	 for (unsigned c = 0, c0 = 0, c1 = 0;

+	      c < components;

+	      c0 += c0_inc, c1 += c1_inc, c++) {

+

+	    switch (op[0]->type->base_type) {

+	    case GLSL_TYPE_UINT:

+	       data.u[c] = op[0]->value.u[c0] * op[1]->value.u[c1];

+	       break;

+	    case GLSL_TYPE_INT:

+	       data.i[c] = op[0]->value.i[c0] * op[1]->value.i[c1];

+	       break;

+	    case GLSL_TYPE_FLOAT:

+	       data.f[c] = op[0]->value.f[c0] * op[1]->value.f[c1];

+	       break;

+	    default:

+	       assert(0);

+	    }

+	 }

+      } else {

+	 assert(op[0]->type->is_matrix() || op[1]->type->is_matrix());

+

+	 /* Multiply an N-by-M matrix with an M-by-P matrix.  Since either

+	  * matrix can be a GLSL vector, either N or P can be 1.

+	  *

+	  * For vec*mat, the vector is treated as a row vector.  This

+	  * means the vector is a 1-row x M-column matrix.

+	  *

+	  * For mat*vec, the vector is treated as a column vector.  Since

+	  * matrix_columns is 1 for vectors, this just works.

+	  */

+	 const unsigned n = op[0]->type->is_vector()

+	    ? 1 : op[0]->type->vector_elements;

+	 const unsigned m = op[1]->type->vector_elements;

+	 const unsigned p = op[1]->type->matrix_columns;

+	 for (unsigned j = 0; j < p; j++) {

+	    for (unsigned i = 0; i < n; i++) {

+	       for (unsigned k = 0; k < m; k++) {

+		  data.f[i+n*j] += op[0]->value.f[i+n*k]*op[1]->value.f[k+m*j];

+	       }

+	    }

+	 }

+      }

+

+      break;

+   case ir_binop_div:

+      assert(op[0]->type == op[1]->type || op0_scalar || op1_scalar);

+      for (unsigned c = 0, c0 = 0, c1 = 0;

+	   c < components;

+	   c0 += c0_inc, c1 += c1_inc, c++) {

+

+	 switch (op[0]->type->base_type) {

+	 case GLSL_TYPE_UINT:

+	    data.u[c] = op[0]->value.u[c0] / op[1]->value.u[c1];

+	    break;

+	 case GLSL_TYPE_INT:

+	    data.i[c] = op[0]->value.i[c0] / op[1]->value.i[c1];

+	    break;

+	 case GLSL_TYPE_FLOAT:

+	    data.f[c] = op[0]->value.f[c0] / op[1]->value.f[c1];

+	    break;

+	 default:

+	    assert(0);

+	 }

+      }

+

+      break;

+   case ir_binop_mod:

+      assert(op[0]->type == op[1]->type || op0_scalar || op1_scalar);

+      for (unsigned c = 0, c0 = 0, c1 = 0;

+	   c < components;

+	   c0 += c0_inc, c1 += c1_inc, c++) {

+

+	 switch (op[0]->type->base_type) {

+	 case GLSL_TYPE_UINT:

+	    data.u[c] = op[0]->value.u[c0] % op[1]->value.u[c1];

+	    break;

+	 case GLSL_TYPE_INT:

+	    data.i[c] = op[0]->value.i[c0] % op[1]->value.i[c1];

+	    break;

+	 case GLSL_TYPE_FLOAT:

+	    /* We don't use fmod because it rounds toward zero; GLSL specifies

+	     * the use of floor.

+	     */

+	    data.f[c] = op[0]->value.f[c0] - op[1]->value.f[c1]

+	       * floorf(op[0]->value.f[c0] / op[1]->value.f[c1]);

+	    break;

+	 default:

+	    assert(0);

+	 }

+      }

+

+      break;

+

+   case ir_binop_logic_and:

+      assert(op[0]->type->base_type == GLSL_TYPE_BOOL);

+      for (unsigned c = 0; c < op[0]->type->components(); c++)

+	 data.b[c] = op[0]->value.b[c] && op[1]->value.b[c];

+      break;

+   case ir_binop_logic_xor:

+      assert(op[0]->type->base_type == GLSL_TYPE_BOOL);

+      for (unsigned c = 0; c < op[0]->type->components(); c++)

+	 data.b[c] = op[0]->value.b[c] ^ op[1]->value.b[c];

+      break;

+   case ir_binop_logic_or:

+      assert(op[0]->type->base_type == GLSL_TYPE_BOOL);

+      for (unsigned c = 0; c < op[0]->type->components(); c++)

+	 data.b[c] = op[0]->value.b[c] || op[1]->value.b[c];

+      break;

+

+   case ir_binop_less:

+      assert(op[0]->type == op[1]->type);

+      for (unsigned c = 0; c < op[0]->type->components(); c++) {

+	 switch (op[0]->type->base_type) {

+	 case GLSL_TYPE_UINT:

+	    data.b[0] = op[0]->value.u[0] < op[1]->value.u[0];

+	    break;

+	 case GLSL_TYPE_INT:

+	    data.b[0] = op[0]->value.i[0] < op[1]->value.i[0];

+	    break;

+	 case GLSL_TYPE_FLOAT:

+	    data.b[0] = op[0]->value.f[0] < op[1]->value.f[0];

+	    break;

+	 default:

+	    assert(0);

+	 }

+      }

+      break;

+   case ir_binop_greater:

+      assert(op[0]->type == op[1]->type);

+      for (unsigned c = 0; c < op[0]->type->components(); c++) {

+	 switch (op[0]->type->base_type) {

+	 case GLSL_TYPE_UINT:

+	    data.b[c] = op[0]->value.u[c] > op[1]->value.u[c];

+	    break;

+	 case GLSL_TYPE_INT:

+	    data.b[c] = op[0]->value.i[c] > op[1]->value.i[c];

+	    break;

+	 case GLSL_TYPE_FLOAT:

+	    data.b[c] = op[0]->value.f[c] > op[1]->value.f[c];

+	    break;

+	 default:

+	    assert(0);

+	 }

+      }

+      break;

+   case ir_binop_lequal:

+      assert(op[0]->type == op[1]->type);

+      for (unsigned c = 0; c < op[0]->type->components(); c++) {

+	 switch (op[0]->type->base_type) {

+	 case GLSL_TYPE_UINT:

+	    data.b[0] = op[0]->value.u[0] <= op[1]->value.u[0];

+	    break;

+	 case GLSL_TYPE_INT:

+	    data.b[0] = op[0]->value.i[0] <= op[1]->value.i[0];

+	    break;

+	 case GLSL_TYPE_FLOAT:

+	    data.b[0] = op[0]->value.f[0] <= op[1]->value.f[0];

+	    break;

+	 default:

+	    assert(0);

+	 }

+      }

+      break;

+   case ir_binop_gequal:

+      assert(op[0]->type == op[1]->type);

+      for (unsigned c = 0; c < op[0]->type->components(); c++) {

+	 switch (op[0]->type->base_type) {

+	 case GLSL_TYPE_UINT:

+	    data.b[0] = op[0]->value.u[0] >= op[1]->value.u[0];

+	    break;

+	 case GLSL_TYPE_INT:

+	    data.b[0] = op[0]->value.i[0] >= op[1]->value.i[0];

+	    break;

+	 case GLSL_TYPE_FLOAT:

+	    data.b[0] = op[0]->value.f[0] >= op[1]->value.f[0];

+	    break;

+	 default:

+	    assert(0);

+	 }

+      }

+      break;

+   case ir_binop_equal:

+      assert(op[0]->type == op[1]->type);

+      for (unsigned c = 0; c < components; c++) {

+	 switch (op[0]->type->base_type) {

+	 case GLSL_TYPE_UINT:

+	    data.b[c] = op[0]->value.u[c] == op[1]->value.u[c];

+	    break;

+	 case GLSL_TYPE_INT:

+	    data.b[c] = op[0]->value.i[c] == op[1]->value.i[c];

+	    break;

+	 case GLSL_TYPE_FLOAT:

+	    data.b[c] = op[0]->value.f[c] == op[1]->value.f[c];

+	    break;

+	 default:

+	    assert(0);

+	 }

+      }

+      break;

+   case ir_binop_nequal:

+      assert(op[0]->type != op[1]->type);

+      for (unsigned c = 0; c < components; c++) {

+	 switch (op[0]->type->base_type) {

+	 case GLSL_TYPE_UINT:

+	    data.b[c] = op[0]->value.u[c] != op[1]->value.u[c];

+	    break;

+	 case GLSL_TYPE_INT:

+	    data.b[c] = op[0]->value.i[c] != op[1]->value.i[c];

+	    break;

+	 case GLSL_TYPE_FLOAT:

+	    data.b[c] = op[0]->value.f[c] != op[1]->value.f[c];

+	    break;

+	 default:

+	    assert(0);

+	 }

+      }

+      break;

+   case ir_binop_all_equal:

+      data.b[0] = op[0]->has_value(op[1]);

+      break;

+   case ir_binop_any_nequal:

+      data.b[0] = !op[0]->has_value(op[1]);

+      break;

+

+   case ir_binop_lshift:

+      for (unsigned c = 0, c0 = 0, c1 = 0;

+           c < components;

+           c0 += c0_inc, c1 += c1_inc, c++) {

+

+          if (op[0]->type->base_type == GLSL_TYPE_INT &&

+              op[1]->type->base_type == GLSL_TYPE_INT) {

+              data.i[c] = op[0]->value.i[c0] << op[1]->value.i[c1];

+

+          } else if (op[0]->type->base_type == GLSL_TYPE_INT &&

+                     op[1]->type->base_type == GLSL_TYPE_UINT) {

+              data.i[c] = op[0]->value.i[c0] << op[1]->value.u[c1];

+

+          } else if (op[0]->type->base_type == GLSL_TYPE_UINT &&

+                     op[1]->type->base_type == GLSL_TYPE_INT) {

+              data.u[c] = op[0]->value.u[c0] << op[1]->value.i[c1];

+

+          } else if (op[0]->type->base_type == GLSL_TYPE_UINT &&

+                     op[1]->type->base_type == GLSL_TYPE_UINT) {

+              data.u[c] = op[0]->value.u[c0] << op[1]->value.u[c1];

+          }

+      }

+      break;

+

+   case ir_binop_rshift:

+       for (unsigned c = 0, c0 = 0, c1 = 0;

+            c < components;

+            c0 += c0_inc, c1 += c1_inc, c++) {

+

+           if (op[0]->type->base_type == GLSL_TYPE_INT &&

+               op[1]->type->base_type == GLSL_TYPE_INT) {

+               data.i[c] = op[0]->value.i[c0] >> op[1]->value.i[c1];

+

+           } else if (op[0]->type->base_type == GLSL_TYPE_INT &&

+                      op[1]->type->base_type == GLSL_TYPE_UINT) {

+               data.i[c] = op[0]->value.i[c0] >> op[1]->value.u[c1];

+

+           } else if (op[0]->type->base_type == GLSL_TYPE_UINT &&

+                      op[1]->type->base_type == GLSL_TYPE_INT) {

+               data.u[c] = op[0]->value.u[c0] >> op[1]->value.i[c1];

+

+           } else if (op[0]->type->base_type == GLSL_TYPE_UINT &&

+                      op[1]->type->base_type == GLSL_TYPE_UINT) {

+               data.u[c] = op[0]->value.u[c0] >> op[1]->value.u[c1];

+           }

+       }

+       break;

+

+   case ir_binop_bit_and:

+      for (unsigned c = 0, c0 = 0, c1 = 0;

+           c < components;

+           c0 += c0_inc, c1 += c1_inc, c++) {

+

+          switch (op[0]->type->base_type) {

+          case GLSL_TYPE_INT:

+              data.i[c] = op[0]->value.i[c0] & op[1]->value.i[c1];

+              break;

+          case GLSL_TYPE_UINT:

+              data.u[c] = op[0]->value.u[c0] & op[1]->value.u[c1];

+              break;

+          default:

+              assert(0);

+          }

+      }

+      break;

+

+   case ir_binop_bit_or:

+      for (unsigned c = 0, c0 = 0, c1 = 0;

+           c < components;

+           c0 += c0_inc, c1 += c1_inc, c++) {

+

+          switch (op[0]->type->base_type) {

+          case GLSL_TYPE_INT:

+              data.i[c] = op[0]->value.i[c0] | op[1]->value.i[c1];

+              break;

+          case GLSL_TYPE_UINT:

+              data.u[c] = op[0]->value.u[c0] | op[1]->value.u[c1];

+              break;

+          default:

+              assert(0);

+          }

+      }

+      break;

+

+   case ir_binop_bit_xor:

+      for (unsigned c = 0, c0 = 0, c1 = 0;

+           c < components;

+           c0 += c0_inc, c1 += c1_inc, c++) {

+

+          switch (op[0]->type->base_type) {

+          case GLSL_TYPE_INT:

+              data.i[c] = op[0]->value.i[c0] ^ op[1]->value.i[c1];

+              break;

+          case GLSL_TYPE_UINT:

+              data.u[c] = op[0]->value.u[c0] ^ op[1]->value.u[c1];

+              break;

+          default:

+              assert(0);

+          }

+      }

+      break;

+

+   case ir_quadop_vector:

+      for (unsigned c = 0; c < this->type->vector_elements; c++) {

+	 switch (this->type->base_type) {

+	 case GLSL_TYPE_INT:

+	    data.i[c] = op[c]->value.i[0];

+	    break;

+	 case GLSL_TYPE_UINT:

+	    data.u[c] = op[c]->value.u[0];

+	    break;

+	 case GLSL_TYPE_FLOAT:

+	    data.f[c] = op[c]->value.f[0];

+	    break;

+	 default:

+	    assert(0);

+	 }

+      }

+      break;

+

+   default:

+      /* FINISHME: Should handle all expression types. */

+      return NULL;

+   }

+

+   return new(ctx) ir_constant(this->type, &data);

+}

+

+

+ir_constant *

+ir_texture::constant_expression_value()

+{

+   /* texture lookups aren't constant expressions */

+   return NULL;

+}

+

+

+ir_constant *

+ir_swizzle::constant_expression_value()

+{

+   ir_constant *v = this->val->constant_expression_value();

+

+   if (v != NULL) {

+      ir_constant_data data = { { 0 } };

+

+      const unsigned swiz_idx[4] = {

+	 this->mask.x, this->mask.y, this->mask.z, this->mask.w

+      };

+

+      for (unsigned i = 0; i < this->mask.num_components; i++) {

+	 switch (v->type->base_type) {

+	 case GLSL_TYPE_UINT:

+	 case GLSL_TYPE_INT:   data.u[i] = v->value.u[swiz_idx[i]]; break;

+	 case GLSL_TYPE_FLOAT: data.f[i] = v->value.f[swiz_idx[i]]; break;

+	 case GLSL_TYPE_BOOL:  data.b[i] = v->value.b[swiz_idx[i]]; break;

+	 default:              assert(!"Should not get here."); break;

+	 }

+      }

+

+      void *ctx = talloc_parent(this);

+      return new(ctx) ir_constant(this->type, &data);

+   }

+   return NULL;

+}

+

+

+ir_constant *

+ir_dereference_variable::constant_expression_value()

+{

+   /* This may occur during compile and var->type is glsl_type::error_type */

+   if (!var)

+      return NULL;

+

+   /* The constant_value of a uniform variable is its initializer,

+    * not the lifetime constant value of the uniform.

+    */

+   if (var->mode == ir_var_uniform)

+      return NULL;

+

+   if (!var->constant_value)

+      return NULL;

+

+   return var->constant_value->clone(talloc_parent(var), NULL);

+}

+

+

+ir_constant *

+ir_dereference_array::constant_expression_value()

+{

+   ir_constant *array = this->array->constant_expression_value();

+   ir_constant *idx = this->array_index->constant_expression_value();

+

+   if ((array != NULL) && (idx != NULL)) {

+      void *ctx = talloc_parent(this);

+      if (array->type->is_matrix()) {

+	 /* Array access of a matrix results in a vector.

+	  */

+	 const unsigned column = idx->value.u[0];

+

+	 const glsl_type *const column_type = array->type->column_type();

+

+	 /* Offset in the constant matrix to the first element of the column

+	  * to be extracted.

+	  */

+	 const unsigned mat_idx = column * column_type->vector_elements;

+

+	 ir_constant_data data = { { 0 } };

+

+	 switch (column_type->base_type) {

+	 case GLSL_TYPE_UINT:

+	 case GLSL_TYPE_INT:

+	    for (unsigned i = 0; i < column_type->vector_elements; i++)

+	       data.u[i] = array->value.u[mat_idx + i];

+

+	    break;

+

+	 case GLSL_TYPE_FLOAT:

+	    for (unsigned i = 0; i < column_type->vector_elements; i++)

+	       data.f[i] = array->value.f[mat_idx + i];

+

+	    break;

+

+	 default:

+	    assert(!"Should not get here.");

+	    break;

+	 }

+

+	 return new(ctx) ir_constant(column_type, &data);

+      } else if (array->type->is_vector()) {

+	 const unsigned component = idx->value.u[0];

+

+	 return new(ctx) ir_constant(array, component);

+      } else {

+	 const unsigned index = idx->value.u[0];

+	 return array->get_array_element(index)->clone(ctx, NULL);

+      }

+   }

+   return NULL;

+}

+

+

+ir_constant *

+ir_dereference_record::constant_expression_value()

+{

+   ir_constant *v = this->record->constant_expression_value();

+

+   return (v != NULL) ? v->get_record_field(this->field) : NULL;

+}

+

+

+ir_constant *

+ir_assignment::constant_expression_value()

+{

+   /* FINISHME: Handle CEs involving assignment (return RHS) */

+   return NULL;

+}

+

+

+ir_constant *

+ir_constant::constant_expression_value()

+{

+   return this;

+}

+

+

+ir_constant *

+ir_call::constant_expression_value()

+{

+   if (this->type == glsl_type::error_type)

+      return NULL;

+

+   /* From the GLSL 1.20 spec, page 23:

+    * "Function calls to user-defined functions (non-built-in functions)

+    *  cannot be used to form constant expressions."

+    */

+   if (!this->callee->is_builtin)

+      return NULL;

+

+   unsigned num_parameters = 0;

+

+   /* Check if all parameters are constant */

+   ir_constant *op[3];

+   foreach_list(n, &this->actual_parameters) {

+      ir_constant *constant = ((ir_rvalue *) n)->constant_expression_value();

+      if (constant == NULL)

+	 return NULL;

+

+      op[num_parameters] = constant;

+

+      assert(num_parameters < 3);

+      num_parameters++;

+   }

+

+   /* Individual cases below can either:

+    * - Assign "expr" a new ir_expression to evaluate (for basic opcodes)

+    * - Fill "data" with appopriate constant data

+    * - Return an ir_constant directly.

+    */

+   void *mem_ctx = talloc_parent(this);

+   ir_expression *expr = NULL;

+

+   ir_constant_data data;

+   memset(&data, 0, sizeof(data));

+

+   const char *callee = this->callee_name();

+   if (strcmp(callee, "abs") == 0) {

+      expr = new(mem_ctx) ir_expression(ir_unop_abs, type, op[0], NULL);

+   } else if (strcmp(callee, "all") == 0) {

+      assert(op[0]->type->is_boolean());

+      for (unsigned c = 0; c < op[0]->type->components(); c++) {

+	 if (!op[0]->value.b[c])

+	    return new(mem_ctx) ir_constant(false);

+      }

+      return new(mem_ctx) ir_constant(true);

+   } else if (strcmp(callee, "any") == 0) {

+      assert(op[0]->type->is_boolean());

+      for (unsigned c = 0; c < op[0]->type->components(); c++) {

+	 if (op[0]->value.b[c])

+	    return new(mem_ctx) ir_constant(true);

+      }

+      return new(mem_ctx) ir_constant(false);

+   } else if (strcmp(callee, "acos") == 0) {

+      assert(op[0]->type->is_float());

+      for (unsigned c = 0; c < op[0]->type->components(); c++)

+	 data.f[c] = acosf(op[0]->value.f[c]);

+   } else if (strcmp(callee, "acosh") == 0) {

+      assert(op[0]->type->is_float());

+      for (unsigned c = 0; c < op[0]->type->components(); c++)

+	 data.f[c] = acoshf(op[0]->value.f[c]);

+   } else if (strcmp(callee, "asin") == 0) {

+      assert(op[0]->type->is_float());

+      for (unsigned c = 0; c < op[0]->type->components(); c++)

+	 data.f[c] = asinf(op[0]->value.f[c]);

+   } else if (strcmp(callee, "asinh") == 0) {

+      assert(op[0]->type->is_float());

+      for (unsigned c = 0; c < op[0]->type->components(); c++)

+	 data.f[c] = asinhf(op[0]->value.f[c]);

+   } else if (strcmp(callee, "atan") == 0) {

+      assert(op[0]->type->is_float());

+      if (num_parameters == 2) {

+	 assert(op[1]->type->is_float());

+	 for (unsigned c = 0; c < op[0]->type->components(); c++)

+	    data.f[c] = atan2f(op[0]->value.f[c], op[1]->value.f[c]);

+      } else {

+	 for (unsigned c = 0; c < op[0]->type->components(); c++)

+	    data.f[c] = atanf(op[0]->value.f[c]);

+      }

+   } else if (strcmp(callee, "atanh") == 0) {

+      assert(op[0]->type->is_float());

+      for (unsigned c = 0; c < op[0]->type->components(); c++)

+	 data.f[c] = atanhf(op[0]->value.f[c]);

+   } else if (strcmp(callee, "dFdx") == 0 || strcmp(callee, "dFdy") == 0) {

+      return ir_constant::zero(mem_ctx, this->type);

+   } else if (strcmp(callee, "ceil") == 0) {

+      expr = new(mem_ctx) ir_expression(ir_unop_ceil, type, op[0], NULL);

+   } else if (strcmp(callee, "clamp") == 0) {

+      assert(num_parameters == 3);

+      unsigned c1_inc = op[1]->type->is_scalar() ? 0 : 1;

+      unsigned c2_inc = op[2]->type->is_scalar() ? 0 : 1;

+      for (unsigned c = 0, c1 = 0, c2 = 0;

+	   c < op[0]->type->components();

+	   c1 += c1_inc, c2 += c2_inc, c++) {

+

+	 switch (op[0]->type->base_type) {

+	 case GLSL_TYPE_UINT:

+	    data.u[c] = CLAMP(op[0]->value.u[c], op[1]->value.u[c1],

+			      op[2]->value.u[c2]);

+	    break;

+	 case GLSL_TYPE_INT:

+	    data.i[c] = CLAMP(op[0]->value.i[c], op[1]->value.i[c1],

+			      op[2]->value.i[c2]);

+	    break;

+	 case GLSL_TYPE_FLOAT:

+	    data.f[c] = CLAMP(op[0]->value.f[c], op[1]->value.f[c1],

+			      op[2]->value.f[c2]);

+	    break;

+	 default:

+	    assert(!"Should not get here.");

+	 }

+      }

+   } else if (strcmp(callee, "cos") == 0) {

+      expr = new(mem_ctx) ir_expression(ir_unop_cos, type, op[0], NULL);

+   } else if (strcmp(callee, "cosh") == 0) {

+      assert(op[0]->type->is_float());

+      for (unsigned c = 0; c < op[0]->type->components(); c++)

+	 data.f[c] = coshf(op[0]->value.f[c]);

+   } else if (strcmp(callee, "cross") == 0) {

+      assert(op[0]->type == glsl_type::vec3_type);

+      assert(op[1]->type == glsl_type::vec3_type);

+      data.f[0] = (op[0]->value.f[1] * op[1]->value.f[2] -

+		   op[1]->value.f[1] * op[0]->value.f[2]);

+      data.f[1] = (op[0]->value.f[2] * op[1]->value.f[0] -

+		   op[1]->value.f[2] * op[0]->value.f[0]);

+      data.f[2] = (op[0]->value.f[0] * op[1]->value.f[1] -

+		   op[1]->value.f[0] * op[0]->value.f[1]);

+   } else if (strcmp(callee, "degrees") == 0) {

+      assert(op[0]->type->is_float());

+      for (unsigned c = 0; c < op[0]->type->components(); c++)

+	 data.f[c] = 180.0F / M_PI * op[0]->value.f[c];

+   } else if (strcmp(callee, "distance") == 0) {

+      assert(op[0]->type->is_float() && op[1]->type->is_float());

+      float length_squared = 0.0;

+      for (unsigned c = 0; c < op[0]->type->components(); c++) {

+	 float t = op[0]->value.f[c] - op[1]->value.f[c];

+	 length_squared += t * t;

+      }

+      return new(mem_ctx) ir_constant(sqrtf(length_squared));

+   } else if (strcmp(callee, "dot") == 0) {

+      return new(mem_ctx) ir_constant(dot(op[0], op[1]));

+   } else if (strcmp(callee, "equal") == 0) {

+      assert(op[0]->type->is_vector() && op[1] && op[1]->type->is_vector());

+      for (unsigned c = 0; c < op[0]->type->components(); c++) {

+	 switch (op[0]->type->base_type) {

+	 case GLSL_TYPE_UINT:

+	    data.b[c] = op[0]->value.u[c] == op[1]->value.u[c];

+	    break;

+	 case GLSL_TYPE_INT:

+	    data.b[c] = op[0]->value.i[c] == op[1]->value.i[c];

+	    break;

+	 case GLSL_TYPE_FLOAT:

+	    data.b[c] = op[0]->value.f[c] == op[1]->value.f[c];

+	    break;

+	 case GLSL_TYPE_BOOL:

+	    data.b[c] = op[0]->value.b[c] == op[1]->value.b[c];

+	    break;

+	 default:

+	    assert(!"Should not get here.");

+	 }

+      }

+   } else if (strcmp(callee, "exp") == 0) {

+      expr = new(mem_ctx) ir_expression(ir_unop_exp, type, op[0], NULL);

+   } else if (strcmp(callee, "exp2") == 0) {

+      expr = new(mem_ctx) ir_expression(ir_unop_exp2, type, op[0], NULL);

+   } else if (strcmp(callee, "faceforward") == 0) {

+      if (dot(op[2], op[1]) < 0)

+	 return op[0];

+      for (unsigned c = 0; c < op[0]->type->components(); c++)

+	 data.f[c] = -op[0]->value.f[c];

+   } else if (strcmp(callee, "floor") == 0) {

+      expr = new(mem_ctx) ir_expression(ir_unop_floor, type, op[0], NULL);

+   } else if (strcmp(callee, "fract") == 0) {

+      expr = new(mem_ctx) ir_expression(ir_unop_fract, type, op[0], NULL);

+   } else if (strcmp(callee, "fwidth") == 0) {

+      return ir_constant::zero(mem_ctx, this->type);

+   } else if (strcmp(callee, "greaterThan") == 0) {

+      assert(op[0]->type->is_vector() && op[1] && op[1]->type->is_vector());

+      for (unsigned c = 0; c < op[0]->type->components(); c++) {

+	 switch (op[0]->type->base_type) {

+	 case GLSL_TYPE_UINT:

+	    data.b[c] = op[0]->value.u[c] > op[1]->value.u[c];

+	    break;

+	 case GLSL_TYPE_INT:

+	    data.b[c] = op[0]->value.i[c] > op[1]->value.i[c];

+	    break;

+	 case GLSL_TYPE_FLOAT:

+	    data.b[c] = op[0]->value.f[c] > op[1]->value.f[c];

+	    break;

+	 default:

+	    assert(!"Should not get here.");

+	 }

+      }

+   } else if (strcmp(callee, "greaterThanEqual") == 0) {

+      assert(op[0]->type->is_vector() && op[1] && op[1]->type->is_vector());

+      for (unsigned c = 0; c < op[0]->type->components(); c++) {

+	 switch (op[0]->type->base_type) {

+	 case GLSL_TYPE_UINT:

+	    data.b[c] = op[0]->value.u[c] >= op[1]->value.u[c];

+	    break;

+	 case GLSL_TYPE_INT:

+	    data.b[c] = op[0]->value.i[c] >= op[1]->value.i[c];

+	    break;

+	 case GLSL_TYPE_FLOAT:

+	    data.b[c] = op[0]->value.f[c] >= op[1]->value.f[c];

+	    break;

+	 default:

+	    assert(!"Should not get here.");

+	 }

+      }

+   } else if (strcmp(callee, "inversesqrt") == 0) {

+      expr = new(mem_ctx) ir_expression(ir_unop_rsq, type, op[0], NULL);

+   } else if (strcmp(callee, "length") == 0) {

+      return new(mem_ctx) ir_constant(sqrtf(dot(op[0], op[0])));

+   } else if (strcmp(callee, "lessThan") == 0) {

+      assert(op[0]->type->is_vector() && op[1] && op[1]->type->is_vector());

+      for (unsigned c = 0; c < op[0]->type->components(); c++) {

+	 switch (op[0]->type->base_type) {

+	 case GLSL_TYPE_UINT:

+	    data.b[c] = op[0]->value.u[c] < op[1]->value.u[c];

+	    break;

+	 case GLSL_TYPE_INT:

+	    data.b[c] = op[0]->value.i[c] < op[1]->value.i[c];

+	    break;

+	 case GLSL_TYPE_FLOAT:

+	    data.b[c] = op[0]->value.f[c] < op[1]->value.f[c];

+	    break;

+	 default:

+	    assert(!"Should not get here.");

+	 }

+      }

+   } else if (strcmp(callee, "lessThanEqual") == 0) {

+      assert(op[0]->type->is_vector() && op[1] && op[1]->type->is_vector());

+      for (unsigned c = 0; c < op[0]->type->components(); c++) {

+	 switch (op[0]->type->base_type) {

+	 case GLSL_TYPE_UINT:

+	    data.b[c] = op[0]->value.u[c] <= op[1]->value.u[c];

+	    break;

+	 case GLSL_TYPE_INT:

+	    data.b[c] = op[0]->value.i[c] <= op[1]->value.i[c];

+	    break;

+	 case GLSL_TYPE_FLOAT:

+	    data.b[c] = op[0]->value.f[c] <= op[1]->value.f[c];

+	    break;

+	 default:

+	    assert(!"Should not get here.");

+	 }

+      }

+   } else if (strcmp(callee, "log") == 0) {

+      expr = new(mem_ctx) ir_expression(ir_unop_log, type, op[0], NULL);

+   } else if (strcmp(callee, "log2") == 0) {

+      expr = new(mem_ctx) ir_expression(ir_unop_log2, type, op[0], NULL);

+   } else if (strcmp(callee, "matrixCompMult") == 0) {

+      assert(op[0]->type->is_float() && op[1]->type->is_float());

+      for (unsigned c = 0; c < op[0]->type->components(); c++)

+	 data.f[c] = op[0]->value.f[c] * op[1]->value.f[c];

+   } else if (strcmp(callee, "max") == 0) {

+      expr = new(mem_ctx) ir_expression(ir_binop_max, type, op[0], op[1]);

+   } else if (strcmp(callee, "min") == 0) {

+      expr = new(mem_ctx) ir_expression(ir_binop_min, type, op[0], op[1]);

+   } else if (strcmp(callee, "mix") == 0) {

+      assert(op[0]->type->is_float() && op[1]->type->is_float());

+      if (op[2]->type->is_float()) {

+	 unsigned c2_inc = op[2]->type->is_scalar() ? 0 : 1;

+	 unsigned components = op[0]->type->components();

+	 for (unsigned c = 0, c2 = 0; c < components; c2 += c2_inc, c++) {

+	    data.f[c] = op[0]->value.f[c] * (1 - op[2]->value.f[c2]) +

+			op[1]->value.f[c] * op[2]->value.f[c2];

+	 }

+      } else {

+	 assert(op[2]->type->is_boolean());

+	 for (unsigned c = 0; c < op[0]->type->components(); c++)

+	    data.f[c] = op[op[2]->value.b[c] ? 1 : 0]->value.f[c];

+      }

+   } else if (strcmp(callee, "mod") == 0) {

+      expr = new(mem_ctx) ir_expression(ir_binop_mod, type, op[0], op[1]);

+   } else if (strcmp(callee, "normalize") == 0) {

+      assert(op[0]->type->is_float());

+      float length = sqrtf(dot(op[0], op[0]));

+

+      if (length == 0)

+	 return ir_constant::zero(mem_ctx, this->type);

+

+      for (unsigned c = 0; c < op[0]->type->components(); c++)

+	 data.f[c] = op[0]->value.f[c] / length;

+   } else if (strcmp(callee, "not") == 0) {

+      expr = new(mem_ctx) ir_expression(ir_unop_logic_not, type, op[0], NULL);

+   } else if (strcmp(callee, "notEqual") == 0) {

+      assert(op[0]->type->is_vector() && op[1] && op[1]->type->is_vector());

+      for (unsigned c = 0; c < op[0]->type->components(); c++) {

+	 switch (op[0]->type->base_type) {

+	 case GLSL_TYPE_UINT:

+	    data.b[c] = op[0]->value.u[c] != op[1]->value.u[c];

+	    break;

+	 case GLSL_TYPE_INT:

+	    data.b[c] = op[0]->value.i[c] != op[1]->value.i[c];

+	    break;

+	 case GLSL_TYPE_FLOAT:

+	    data.b[c] = op[0]->value.f[c] != op[1]->value.f[c];

+	    break;

+	 case GLSL_TYPE_BOOL:

+	    data.b[c] = op[0]->value.b[c] != op[1]->value.b[c];

+	    break;

+	 default:

+	    assert(!"Should not get here.");

+	 }

+      }

+   } else if (strcmp(callee, "outerProduct") == 0) {

+      assert(op[0]->type->is_vector() && op[1]->type->is_vector());

+      const unsigned m = op[0]->type->vector_elements;

+      const unsigned n = op[1]->type->vector_elements;

+      for (unsigned j = 0; j < n; j++) {

+	 for (unsigned i = 0; i < m; i++) {

+	    data.f[i+m*j] = op[0]->value.f[i] * op[1]->value.f[j];

+	 }

+      }

+   } else if (strcmp(callee, "pow") == 0) {

+      expr = new(mem_ctx) ir_expression(ir_binop_pow, type, op[0], op[1]);

+   } else if (strcmp(callee, "radians") == 0) {

+      assert(op[0]->type->is_float());

+      for (unsigned c = 0; c < op[0]->type->components(); c++)

+	 data.f[c] = M_PI / 180.0F * op[0]->value.f[c];

+   } else if (strcmp(callee, "reflect") == 0) {

+      assert(op[0]->type->is_float());

+      float dot_NI = dot(op[1], op[0]);

+      for (unsigned c = 0; c < op[0]->type->components(); c++)

+	 data.f[c] = op[0]->value.f[c] - 2 * dot_NI * op[1]->value.f[c];

+   } else if (strcmp(callee, "refract") == 0) {

+      const float eta = op[2]->value.f[0];

+      const float dot_NI = dot(op[1], op[0]);

+      const float k = 1.0F - eta * eta * (1.0F - dot_NI * dot_NI);

+      if (k < 0.0) {

+	 return ir_constant::zero(mem_ctx, this->type);

+      } else {

+	 for (unsigned c = 0; c < type->components(); c++) {

+	    data.f[c] = eta * op[0]->value.f[c] - (eta * dot_NI + sqrtf(k))

+			    * op[1]->value.f[c];

+	 }

+      }

+   } else if (strcmp(callee, "sign") == 0) {

+      expr = new(mem_ctx) ir_expression(ir_unop_sign, type, op[0], NULL);

+   } else if (strcmp(callee, "sin") == 0) {

+      expr = new(mem_ctx) ir_expression(ir_unop_sin, type, op[0], NULL);

+   } else if (strcmp(callee, "sinh") == 0) {

+      assert(op[0]->type->is_float());

+      for (unsigned c = 0; c < op[0]->type->components(); c++)

+	 data.f[c] = sinhf(op[0]->value.f[c]);

+   } else if (strcmp(callee, "smoothstep") == 0) {

+      assert(num_parameters == 3);

+      assert(op[1]->type == op[0]->type);

+      unsigned edge_inc = op[0]->type->is_scalar() ? 0 : 1;

+      for (unsigned c = 0, e = 0; c < type->components(); e += edge_inc, c++) {

+	 const float edge0 = op[0]->value.f[e];

+	 const float edge1 = op[1]->value.f[e];

+	 if (edge0 == edge1) {

+	    data.f[c] = 0.0; /* Avoid a crash - results are undefined anyway */

+	 } else {

+	    const float numerator = op[2]->value.f[c] - edge0;

+	    const float denominator = edge1 - edge0;

+	    const float t = CLAMP(numerator/denominator, 0, 1);

+	    data.f[c] = t * t * (3 - 2 * t);

+	 }

+      }

+   } else if (strcmp(callee, "sqrt") == 0) {

+      expr = new(mem_ctx) ir_expression(ir_unop_sqrt, type, op[0], NULL);

+   } else if (strcmp(callee, "step") == 0) {

+      assert(op[0]->type->is_float() && op[1]->type->is_float());

+      /* op[0] (edge) may be either a scalar or a vector */

+      const unsigned c0_inc = op[0]->type->is_scalar() ? 0 : 1;

+      for (unsigned c = 0, c0 = 0; c < type->components(); c0 += c0_inc, c++)

+	 data.f[c] = (op[1]->value.f[c] < op[0]->value.f[c0]) ? 0.0F : 1.0F;

+   } else if (strcmp(callee, "tan") == 0) {

+      assert(op[0]->type->is_float());

+      for (unsigned c = 0; c < op[0]->type->components(); c++)

+	 data.f[c] = tanf(op[0]->value.f[c]);

+   } else if (strcmp(callee, "tanh") == 0) {

+      assert(op[0]->type->is_float());

+      for (unsigned c = 0; c < op[0]->type->components(); c++)

+	 data.f[c] = tanhf(op[0]->value.f[c]);

+   } else if (strcmp(callee, "transpose") == 0) {

+      assert(op[0]->type->is_matrix());

+      const unsigned n = op[0]->type->vector_elements;

+      const unsigned m = op[0]->type->matrix_columns;

+      for (unsigned j = 0; j < m; j++) {

+	 for (unsigned i = 0; i < n; i++) {

+	    data.f[m*i+j] += op[0]->value.f[i+n*j];

+	 }

+      }

+   } else {

+      /* Unsupported builtin - some are not allowed in constant expressions. */

+      return NULL;

+   }

+

+   if (expr != NULL)

+      return expr->constant_expression_value();

+

+   return new(mem_ctx) ir_constant(this->type, &data);

+}