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authorMatt Turner <[email protected]>2014-02-24 15:00:45 -0800
committerMatt Turner <[email protected]>2014-02-28 10:36:12 -0800
commitd5fa8a956211692441b9c3ffc97b7486599ab3a3 (patch)
tree5cb6b7339c046f62088950bf97a104ad7fe71578 /src/glsl
parentecc6c3d4ab31c6cd848bce02790000c165a02229 (diff)
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 <[email protected]>
Diffstat (limited to 'src/glsl')
-rw-r--r--src/glsl/opt_algebraic.cpp2
1 files changed, 2 insertions, 0 deletions
diff --git a/src/glsl/opt_algebraic.cpp b/src/glsl/opt_algebraic.cpp
index 28f95a44c7f..778638cf261 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;