Mesa (master): glsl: Apply the transformation "(a ^^ a) -> false" in opt_algebraic.
Eric Anholt
anholt at kemper.freedesktop.org
Fri Nov 15 19:34:01 UTC 2013
Module: Mesa
Branch: master
Commit: 477f8cd08bb8467d28fdfd6c25fe358957e3da58
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=477f8cd08bb8467d28fdfd6c25fe358957e3da58
Author: Eric Anholt <eric at anholt.net>
Date: Thu Nov 7 12:10:25 2013 -0800
glsl: Apply the transformation "(a ^^ a) -> false" in opt_algebraic.
Reviewed-by: Jordan Justen <jordan.l.justen at intel.com>
---
src/glsl/opt_algebraic.cpp | 4 +++-
1 files changed, 3 insertions(+), 1 deletions(-)
diff --git a/src/glsl/opt_algebraic.cpp b/src/glsl/opt_algebraic.cpp
index ea3c386..448f27e 100644
--- a/src/glsl/opt_algebraic.cpp
+++ b/src/glsl/opt_algebraic.cpp
@@ -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;
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