Mesa (master): glsl: Optimize lrp(x, 0, a) into x - (x * a).
Matt Turner
mattst88 at kemper.freedesktop.org
Fri Feb 28 18:39:37 UTC 2014
Module: Mesa
Branch: master
Commit: d5fa8a956211692441b9c3ffc97b7486599ab3a3
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=d5fa8a956211692441b9c3ffc97b7486599ab3a3
Author: Matt Turner <mattst88 at gmail.com>
Date: Mon Feb 24 15:00:45 2014 -0800
glsl: Optimize lrp(x, 0, a) into x - (x * a).
Helps one program in shader-db:
instructions in affected programs: 96 -> 92 (-4.17%)
Reviewed-by: Ian Romanick <ian.d.romanick at intel.com>
---
src/glsl/opt_algebraic.cpp | 2 ++
1 file changed, 2 insertions(+)
diff --git a/src/glsl/opt_algebraic.cpp b/src/glsl/opt_algebraic.cpp
index 28f95a4..778638c 100644
--- a/src/glsl/opt_algebraic.cpp
+++ b/src/glsl/opt_algebraic.cpp
@@ -570,6 +570,8 @@ ir_algebraic_visitor::handle_expression(ir_expression *ir)
return ir->operands[0];
} else if (is_vec_zero(op_const[0])) {
return mul(ir->operands[1], ir->operands[2]);
+ } else if (is_vec_zero(op_const[1])) {
+ return add(ir->operands[0], neg(mul(ir->operands[0], ir->operands[2])));
}
break;
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