From 85ef9930f56bf15181f9a0b238f03d55303cf411 Mon Sep 17 00:00:00 2001
From: marha <marha@users.sourceforge.net>
Date: Mon, 22 Nov 2010 19:42:40 +0000
Subject: Updated to mesalib 7.9

---
 mesalib/src/glsl/ir_constant_expression.cpp | 1194 +++++++++++++++++++++++++++
 1 file changed, 1194 insertions(+)
 create mode 100644 mesalib/src/glsl/ir_constant_expression.cpp

(limited to 'mesalib/src/glsl/ir_constant_expression.cpp')

diff --git a/mesalib/src/glsl/ir_constant_expression.cpp b/mesalib/src/glsl/ir_constant_expression.cpp
new file mode 100644
index 000000000..61a708f6e
--- /dev/null
+++ b/mesalib/src/glsl/ir_constant_expression.cpp
@@ -0,0 +1,1194 @@
+/*
+ * 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);
+}
-- 
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