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glsl: Optimize (f2i(trunc x)) into (f2i x). 

total instructions in shared programs: 5950326 -> 5949286 (-0.02%)
instructions in affected programs:     88264 -> 87224 (-1.18%)
helped:                                692
This commit is contained in:
Matt Turner 2015-01-30 13:42:19 -08:00
parent c262b2b582
commit 69ad5fd4ce
1 changed files with 9 additions and 0 deletions
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9
src/glsl/opt_algebraic.cpp
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@ -376,6 +376,15 @@ ir_algebraic_visitor::handle_expression(ir_expression *ir)
}
break;
case ir_unop_f2i:
case ir_unop_f2u:
if (op_expr[0] && op_expr[0]->operation == ir_unop_trunc) {
return new(mem_ctx) ir_expression(ir->operation,
ir->type,
op_expr[0]->operands[0]);
}
break;
case ir_unop_logic_not: {
enum ir_expression_operation new_op = ir_unop_logic_not;