1 files changed, 490 insertions, 0 deletions
diff --git a/mesalib/src/glsl/lower_mat_op_to_vec.cpp b/mesalib/src/glsl/lower_mat_op_to_vec.cpp
new file mode 100644
index 000000000..d61d94443
--- /dev/null
+++ b/mesalib/src/glsl/lower_mat_op_to_vec.cpp
@@ -0,0 +1,490 @@
+/*
+ * 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 lower_mat_op_to_vec.cpp
+ *
+ * Breaks matrix operation expressions down to a series of vector operations.
+ *
+ * Generally this is how we have to codegen matrix operations for a
+ * GPU, so this gives us the chance to constant fold operations on a
+ * column or row.
+ */
+
+#include "ir.h"
+#include "ir_expression_flattening.h"
+#include "glsl_types.h"
+
+class ir_mat_op_to_vec_visitor : public ir_hierarchical_visitor {
+public:
+   ir_mat_op_to_vec_visitor()
+   {
+      this->made_progress = false;
+      this->mem_ctx = NULL;
+   }
+
+   ir_visitor_status visit_leave(ir_assignment *);
+
+   ir_dereference *get_column(ir_variable *var, int col);
+   ir_rvalue *get_element(ir_variable *var, int col, int row);
+
+   void do_mul_mat_mat(ir_variable *result_var,
+		       ir_variable *a_var, ir_variable *b_var);
+   void do_mul_mat_vec(ir_variable *result_var,
+		       ir_variable *a_var, ir_variable *b_var);
+   void do_mul_vec_mat(ir_variable *result_var,
+		       ir_variable *a_var, ir_variable *b_var);
+   void do_mul_mat_scalar(ir_variable *result_var,
+			  ir_variable *a_var, ir_variable *b_var);
+   void do_equal_mat_mat(ir_variable *result_var, ir_variable *a_var,
+			 ir_variable *b_var, bool test_equal);
+
+   void *mem_ctx;
+   bool made_progress;
+};
+
+static bool
+mat_op_to_vec_predicate(ir_instruction *ir)
+{
+   ir_expression *expr = ir->as_expression();
+   unsigned int i;
+
+   if (!expr)
+      return false;
+
+   for (i = 0; i < expr->get_num_operands(); i++) {
+      if (expr->operands[i]->type->is_matrix())
+	 return true;
+   }
+
+   return false;
+}
+
+bool
+do_mat_op_to_vec(exec_list *instructions)
+{
+   ir_mat_op_to_vec_visitor v;
+
+   /* Pull out any matrix expression to a separate assignment to a
+    * temp.  This will make our handling of the breakdown to
+    * operations on the matrix's vector components much easier.
+    */
+   do_expression_flattening(instructions, mat_op_to_vec_predicate);
+
+   visit_list_elements(&v, instructions);
+
+   return v.made_progress;
+}
+
+ir_rvalue *
+ir_mat_op_to_vec_visitor::get_element(ir_variable *var, int col, int row)
+{
+   ir_dereference *deref;
+
+   deref = new(mem_ctx) ir_dereference_variable(var);
+
+   if (var->type->is_matrix()) {
+      deref = new(mem_ctx) ir_dereference_array(var,
+						new(mem_ctx) ir_constant(col));
+   } else {
+      assert(col == 0);
+   }
+
+   return new(mem_ctx) ir_swizzle(deref, row, 0, 0, 0, 1);
+}
+
+ir_dereference *
+ir_mat_op_to_vec_visitor::get_column(ir_variable *var, int row)
+{
+   ir_dereference *deref;
+
+   if (!var->type->is_matrix()) {
+      deref = new(mem_ctx) ir_dereference_variable(var);
+   } else {
+      deref = new(mem_ctx) ir_dereference_variable(var);
+      deref = new(mem_ctx) ir_dereference_array(deref,
+						new(mem_ctx) ir_constant(row));
+   }
+
+   return deref;
+}
+
+void
+ir_mat_op_to_vec_visitor::do_mul_mat_mat(ir_variable *result_var,
+					 ir_variable *a_var,
+					 ir_variable *b_var)
+{
+   int b_col, i;
+   ir_assignment *assign;
+   ir_expression *expr;
+
+   for (b_col = 0; b_col < b_var->type->matrix_columns; b_col++) {
+      ir_rvalue *a = get_column(a_var, 0);
+      ir_rvalue *b = get_element(b_var, b_col, 0);
+
+      /* first column */
+      expr = new(mem_ctx) ir_expression(ir_binop_mul,
+					a->type,
+					a,
+					b);
+
+      /* following columns */
+      for (i = 1; i < a_var->type->matrix_columns; i++) {
+	 ir_expression *mul_expr;
+
+	 a = get_column(a_var, i);
+	 b = get_element(b_var, b_col, i);
+
+	 mul_expr = new(mem_ctx) ir_expression(ir_binop_mul,
+					       a->type,
+					       a,
+					       b);
+	 expr = new(mem_ctx) ir_expression(ir_binop_add,
+					   a->type,
+					   expr,
+					   mul_expr);
+      }
+
+      ir_rvalue *result = get_column(result_var, b_col);
+      assign = new(mem_ctx) ir_assignment(result,
+					  expr,
+					  NULL);
+      base_ir->insert_before(assign);
+   }
+}
+
+void
+ir_mat_op_to_vec_visitor::do_mul_mat_vec(ir_variable *result_var,
+					 ir_variable *a_var,
+					 ir_variable *b_var)
+{
+   int i;
+   ir_rvalue *a = get_column(a_var, 0);
+   ir_rvalue *b = get_element(b_var, 0, 0);
+   ir_assignment *assign;
+   ir_expression *expr;
+
+   /* first column */
+   expr = new(mem_ctx) ir_expression(ir_binop_mul,
+				     result_var->type,
+				     a,
+				     b);
+
+   /* following columns */
+   for (i = 1; i < a_var->type->matrix_columns; i++) {
+      ir_expression *mul_expr;
+
+      a = get_column(a_var, i);
+      b = get_element(b_var, 0, i);
+
+      mul_expr = new(mem_ctx) ir_expression(ir_binop_mul,
+					    result_var->type,
+					    a,
+					    b);
+      expr = new(mem_ctx) ir_expression(ir_binop_add,
+					result_var->type,
+					expr,
+					mul_expr);
+   }
+
+   ir_rvalue *result = new(mem_ctx) ir_dereference_variable(result_var);
+   assign = new(mem_ctx) ir_assignment(result,
+				       expr,
+				       NULL);
+   base_ir->insert_before(assign);
+}
+
+void
+ir_mat_op_to_vec_visitor::do_mul_vec_mat(ir_variable *result_var,
+					 ir_variable *a_var,
+					 ir_variable *b_var)
+{
+   int i;
+
+   for (i = 0; i < b_var->type->matrix_columns; i++) {
+      ir_rvalue *a = new(mem_ctx) ir_dereference_variable(a_var);
+      ir_rvalue *b = get_column(b_var, i);
+      ir_rvalue *result;
+      ir_expression *column_expr;
+      ir_assignment *column_assign;
+
+      result = new(mem_ctx) ir_dereference_variable(result_var);
+      result = new(mem_ctx) ir_swizzle(result, i, 0, 0, 0, 1);
+
+      column_expr = new(mem_ctx) ir_expression(ir_binop_dot,
+					       result->type,
+					       a,
+					       b);
+
+      column_assign = new(mem_ctx) ir_assignment(result,
+						 column_expr,
+						 NULL);
+      base_ir->insert_before(column_assign);
+   }
+}
+
+void
+ir_mat_op_to_vec_visitor::do_mul_mat_scalar(ir_variable *result_var,
+					    ir_variable *a_var,
+					    ir_variable *b_var)
+{
+   int i;
+
+   for (i = 0; i < a_var->type->matrix_columns; i++) {
+      ir_rvalue *a = get_column(a_var, i);
+      ir_rvalue *b = new(mem_ctx) ir_dereference_variable(b_var);
+      ir_rvalue *result = get_column(result_var, i);
+      ir_expression *column_expr;
+      ir_assignment *column_assign;
+
+      column_expr = new(mem_ctx) ir_expression(ir_binop_mul,
+					       result->type,
+					       a,
+					       b);
+
+      column_assign = new(mem_ctx) ir_assignment(result,
+						 column_expr,
+						 NULL);
+      base_ir->insert_before(column_assign);
+   }
+}
+
+void
+ir_mat_op_to_vec_visitor::do_equal_mat_mat(ir_variable *result_var,
+					   ir_variable *a_var,
+					   ir_variable *b_var,
+					   bool test_equal)
+{
+   /* This essentially implements the following GLSL:
+    *
+    * bool equal(mat4 a, mat4 b)
+    * {
+    *   return !any(bvec4(a[0] != b[0],
+    *                     a[1] != b[1],
+    *                     a[2] != b[2],
+    *                     a[3] != b[3]);
+    * }
+    *
+    * bool nequal(mat4 a, mat4 b)
+    * {
+    *   return any(bvec4(a[0] != b[0],
+    *                    a[1] != b[1],
+    *                    a[2] != b[2],
+    *                    a[3] != b[3]);
+    * }
+    */
+   const unsigned columns = a_var->type->matrix_columns;
+   const glsl_type *const bvec_type =
+      glsl_type::get_instance(GLSL_TYPE_BOOL, columns, 1);
+
+   ir_variable *const tmp_bvec =
+      new(this->mem_ctx) ir_variable(bvec_type, "mat_cmp_bvec",
+				     ir_var_temporary);
+   this->base_ir->insert_before(tmp_bvec);
+
+   for (unsigned i = 0; i < columns; i++) {
+      ir_dereference *const op0 = get_column(a_var, i);
+      ir_dereference *const op1 = get_column(b_var, i);
+
+      ir_expression *const cmp =
+	 new(this->mem_ctx) ir_expression(ir_binop_any_nequal,
+					  glsl_type::bool_type, op0, op1);
+
+      ir_dereference *const lhs =
+	 new(this->mem_ctx) ir_dereference_variable(tmp_bvec);
+
+      ir_assignment *const assign =
+	 new(this->mem_ctx) ir_assignment(lhs, cmp, NULL, (1U << i));
+
+      this->base_ir->insert_before(assign);
+   }
+
+   ir_rvalue *const val =
+      new(this->mem_ctx) ir_dereference_variable(tmp_bvec);
+
+   ir_expression *any =
+      new(this->mem_ctx) ir_expression(ir_unop_any, glsl_type::bool_type,
+				       val, NULL);
+
+   if (test_equal)
+      any = new(this->mem_ctx) ir_expression(ir_unop_logic_not,
+					     glsl_type::bool_type,
+					     any, NULL);
+
+   ir_rvalue *const result =
+      new(this->mem_ctx) ir_dereference_variable(result_var);
+
+   ir_assignment *const assign =
+	 new(mem_ctx) ir_assignment(result, any, NULL);
+   base_ir->insert_before(assign);
+}
+
+static bool
+has_matrix_operand(const ir_expression *expr, unsigned &columns)
+{
+   for (unsigned i = 0; i < expr->get_num_operands(); i++) {
+      if (expr->operands[i]->type->is_matrix()) {
+	 columns = expr->operands[i]->type->matrix_columns;
+	 return true;
+      }
+   }
+
+   return false;
+}
+
+
+ir_visitor_status
+ir_mat_op_to_vec_visitor::visit_leave(ir_assignment *orig_assign)
+{
+   ir_expression *orig_expr = orig_assign->rhs->as_expression();
+   unsigned int i, matrix_columns = 1;
+   ir_variable *op_var[2];
+
+   if (!orig_expr)
+      return visit_continue;
+
+   if (!has_matrix_operand(orig_expr, matrix_columns))
+      return visit_continue;
+
+   assert(orig_expr->get_num_operands() <= 2);
+
+   mem_ctx = talloc_parent(orig_assign);
+
+   ir_dereference_variable *lhs_deref =
+      orig_assign->lhs->as_dereference_variable();
+   assert(lhs_deref);
+
+   ir_variable *result_var = lhs_deref->var;
+
+   /* Store the expression operands in temps so we can use them
+    * multiple times.
+    */
+   for (i = 0; i < orig_expr->get_num_operands(); i++) {
+      ir_assignment *assign;
+
+      op_var[i] = new(mem_ctx) ir_variable(orig_expr->operands[i]->type,
+					   "mat_op_to_vec",
+					   ir_var_temporary);
+      base_ir->insert_before(op_var[i]);
+
+      lhs_deref = new(mem_ctx) ir_dereference_variable(op_var[i]);
+      assign = new(mem_ctx) ir_assignment(lhs_deref,
+					  orig_expr->operands[i],
+					  NULL);
+      base_ir->insert_before(assign);
+   }
+
+   /* OK, time to break down this matrix operation. */
+   switch (orig_expr->operation) {
+   case ir_unop_neg: {
+      const unsigned mask = (1U << result_var->type->vector_elements) - 1;
+
+      /* Apply the operation to each column.*/
+      for (i = 0; i < matrix_columns; i++) {
+	 ir_rvalue *op0 = get_column(op_var[0], i);
+	 ir_dereference *result = get_column(result_var, i);
+	 ir_expression *column_expr;
+	 ir_assignment *column_assign;
+
+	 column_expr = new(mem_ctx) ir_expression(orig_expr->operation,
+						  result->type,
+						  op0,
+						  NULL);
+
+	 column_assign = new(mem_ctx) ir_assignment(result,
+						    column_expr,
+						    NULL,
+						    mask);
+	 assert(column_assign->write_mask != 0);
+	 base_ir->insert_before(column_assign);
+      }
+      break;
+   }
+   case ir_binop_add:
+   case ir_binop_sub:
+   case ir_binop_div:
+   case ir_binop_mod: {
+      const unsigned mask = (1U << result_var->type->vector_elements) - 1;
+
+      /* For most operations, the matrix version is just going
+       * column-wise through and applying the operation to each column
+       * if available.
+       */
+      for (i = 0; i < matrix_columns; i++) {
+	 ir_rvalue *op0 = get_column(op_var[0], i);
+	 ir_rvalue *op1 = get_column(op_var[1], i);
+	 ir_dereference *result = get_column(result_var, i);
+	 ir_expression *column_expr;
+	 ir_assignment *column_assign;
+
+	 column_expr = new(mem_ctx) ir_expression(orig_expr->operation,
+						  result->type,
+						  op0,
+						  op1);
+
+	 column_assign = new(mem_ctx) ir_assignment(result,
+						    column_expr,
+						    NULL,
+						    mask);
+	 assert(column_assign->write_mask != 0);
+	 base_ir->insert_before(column_assign);
+      }
+      break;
+   }
+   case ir_binop_mul:
+      if (op_var[0]->type->is_matrix()) {
+	 if (op_var[1]->type->is_matrix()) {
+	    do_mul_mat_mat(result_var, op_var[0], op_var[1]);
+	 } else if (op_var[1]->type->is_vector()) {
+	    do_mul_mat_vec(result_var, op_var[0], op_var[1]);
+	 } else {
+	    assert(op_var[1]->type->is_scalar());
+	    do_mul_mat_scalar(result_var, op_var[0], op_var[1]);
+	 }
+      } else {
+	 assert(op_var[1]->type->is_matrix());
+	 if (op_var[0]->type->is_vector()) {
+	    do_mul_vec_mat(result_var, op_var[0], op_var[1]);
+	 } else {
+	    assert(op_var[0]->type->is_scalar());
+	    do_mul_mat_scalar(result_var, op_var[1], op_var[0]);
+	 }
+      }
+      break;
+
+   case ir_binop_all_equal:
+   case ir_binop_any_nequal:
+      do_equal_mat_mat(result_var, op_var[1], op_var[0],
+		       (orig_expr->operation == ir_binop_all_equal));
+      break;
+
+   default:
+      printf("FINISHME: Handle matrix operation for %s\n",
+	     orig_expr->operator_string());
+      abort();
+   }
+   orig_assign->remove();
+   this->made_progress = true;
+
+   return visit_continue;
+}