Mesa (master): glsl: Optimize abs(-expr) and abs(abs(expr)) into abs(expr).
Matt Turner
mattst88 at kemper.freedesktop.org
Tue Oct 22 05:54:18 UTC 2013
Module: Mesa
Branch: master
Commit: 963df4d37da7a7a1ee02cf26e142386a62a611f8
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=963df4d37da7a7a1ee02cf26e142386a62a611f8
Author: Matt Turner <mattst88 at gmail.com>
Date: Wed Oct 16 16:56:44 2013 -0700
glsl: Optimize abs(-expr) and abs(abs(expr)) into abs(expr).
Reviewed-by: Paul Berry <stereotype441 at gmail.com>
Reviewed-by: Eric Anholt <eric at anholt.net>
---
src/glsl/opt_algebraic.cpp | 18 ++++++++++++++++++
1 files changed, 18 insertions(+), 0 deletions(-)
diff --git a/src/glsl/opt_algebraic.cpp b/src/glsl/opt_algebraic.cpp
index b915f3c..9b0596c 100644
--- a/src/glsl/opt_algebraic.cpp
+++ b/src/glsl/opt_algebraic.cpp
@@ -210,6 +210,24 @@ ir_algebraic_visitor::handle_expression(ir_expression *ir)
this->mem_ctx = ralloc_parent(ir);
switch (ir->operation) {
+ case ir_unop_abs:
+ if (op_expr[0] == NULL)
+ break;
+
+ switch (op_expr[0]->operation) {
+ case ir_unop_abs:
+ case ir_unop_neg:
+ this->progress = true;
+ temp = new(mem_ctx) ir_expression(ir_unop_abs,
+ ir->type,
+ op_expr[0]->operands[0],
+ NULL);
+ return swizzle_if_required(ir, temp);
+ default:
+ break;
+ }
+ break;
+
case ir_unop_logic_not: {
enum ir_expression_operation new_op = ir_unop_logic_not;
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