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

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Reviewed-by: Jordan Justen <jordan.l.justen@intel.com>
This commit is contained in:
Eric Anholt 2013-11-07 12:10:25 -08:00
parent 58a98d32e4
commit 477f8cd08b
1 changed files with 3 additions and 1 deletions
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4
src/glsl/opt_algebraic.cpp
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@ -377,7 +377,6 @@ ir_algebraic_visitor::handle_expression(ir_expression *ir)
break;
case ir_binop_logic_xor:
/* FINISHME: Also simplify (a ^^ a) to (false). */
if (is_vec_zero(op_const[0])) {
return ir->operands[1];
} else if (is_vec_zero(op_const[1])) {
@ -386,6 +385,9 @@ ir_algebraic_visitor::handle_expression(ir_expression *ir)
return logic_not(ir->operands[1]);
} else if (is_vec_one(op_const[1])) {
return logic_not(ir->operands[0]);
} else if (ir->operands[0]->equals(ir->operands[1])) {
/* (a ^^ a) == false */
return ir_constant::zero(mem_ctx, ir->type);
}
break;