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glsl: Apply the transformation "(a || a) -> a" in opt_algebraic.

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total instructions in shared programs: 1732385 -> 1732373 (-0.00%)
instructions in affected programs:     416 -> 404 (-2.88%)
GAINED:                                0
LOST:                                  0

(That's 4 already-short fragment shaders in dota2)

Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
This commit is contained in:
Eric Anholt 2013-10-31 00:10:32 -07:00
parent 8957c6b887
commit ee27048262
1 changed files with 3 additions and 1 deletions
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4
src/glsl/opt_algebraic.cpp
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@ -388,7 +388,6 @@ ir_algebraic_visitor::handle_expression(ir_expression *ir)
break;
case ir_binop_logic_or:
/* FINISHME: Also simplify (a || a) to (a). */
if (is_vec_zero(op_const[0])) {
return ir->operands[1];
} else if (is_vec_zero(op_const[1])) {
@ -407,6 +406,9 @@ ir_algebraic_visitor::handle_expression(ir_expression *ir)
*/
return logic_not(logic_and(op_expr[0]->operands[0],
op_expr[1]->operands[0]));
} else if (ir->operands[0]->equals(ir->operands[1])) {
/* (a || a) == a */
return ir->operands[0];
}
break;