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glsl2: Refactor constant folding of rvalues to a function.

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This commit is contained in:
Eric Anholt
2010-08-04 16:06:00 -07:00
parent 0ef79a5f11
commit 3d23f0a90c
1 changed files with 21 additions and 26 deletions
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47
src/glsl/ir_constant_folding.cpp
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@@ -73,8 +73,24 @@ public:
virtual void visit(ir_loop *);
virtual void visit(ir_loop_jump *);
/*@}*/
void fold_constant(ir_rvalue **rvalue);
};
void
ir_constant_folding_visitor::fold_constant(ir_rvalue **rvalue)
{
if ((*rvalue)->ir_type == ir_type_constant)
return;
ir_constant *constant = (*rvalue)->constant_expression_value();
if (constant) {
*rvalue = constant;
} else {
(*rvalue)->accept(this);
}
}
void
ir_constant_folding_visitor::visit(ir_variable *ir)
{
@@ -101,16 +117,10 @@ ir_constant_folding_visitor::visit(ir_function *ir)
void
ir_constant_folding_visitor::visit(ir_expression *ir)
{
ir_constant *op[2];
unsigned int operand;
for (operand = 0; operand < ir->get_num_operands(); operand++) {
op[operand] = ir->operands[operand]->constant_expression_value();
if (op[operand]) {
ir->operands[operand] = op[operand];
} else {
ir->operands[operand]->accept(this);
}
fold_constant(&ir->operands[operand]);
}
}
@@ -140,14 +150,7 @@ ir_constant_folding_visitor::visit(ir_dereference_variable *ir)
void
ir_constant_folding_visitor::visit(ir_dereference_array *ir)
{
ir_constant *const_val =
ir->array_index->constant_expression_value();
if (const_val)
ir->array_index = const_val;
else
ir->array_index->accept(this);
fold_constant(&ir->array_index);
ir->array->accept(this);
}
@@ -162,17 +165,13 @@ ir_constant_folding_visitor::visit(ir_dereference_record *ir)
void
ir_constant_folding_visitor::visit(ir_assignment *ir)
{
ir_constant *const_val = ir->rhs->constant_expression_value();
if (const_val)
ir->rhs = const_val;
else
ir->rhs->accept(this);
fold_constant(&ir->rhs);
if (ir->condition) {
/* If the condition is constant, either remove the condition or
* remove the never-executed assignment.
*/
const_val = ir->condition->constant_expression_value();
ir_constant *const_val = ir->condition->constant_expression_value();
if (const_val) {
if (const_val->value.b[0])
ir->condition = NULL;
@@ -214,11 +213,7 @@ ir_constant_folding_visitor::visit(ir_discard *ir)
void
ir_constant_folding_visitor::visit(ir_if *ir)
{
ir_constant *const_val = ir->condition->constant_expression_value();
if (const_val)
ir->condition = const_val;
else
ir->condition->accept(this);
fold_constant(&ir->condition);
visit_exec_list(&ir->then_instructions, this);
visit_exec_list(&ir->else_instructions, this);