Mesa (master): glsl: Optimize various cases of fma (aka MAD).
Eric Anholt
anholt at kemper.freedesktop.org
Fri Feb 7 20:49:52 UTC 2014
Module: Mesa
Branch: master
Commit: de796b0ef09f05ca3f8a568ed07293e28ae697b0
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=de796b0ef09f05ca3f8a568ed07293e28ae697b0
Author: Eric Anholt <eric at anholt.net>
Date: Sat Jan 18 11:06:16 2014 -0800
glsl: Optimize various cases of fma (aka MAD).
Reviewed-by: Matt Turner <mattst88 at gmail.com>
---
src/glsl/opt_algebraic.cpp | 13 +++++++++++++
1 file changed, 13 insertions(+)
diff --git a/src/glsl/opt_algebraic.cpp b/src/glsl/opt_algebraic.cpp
index 392051f..7863fe8 100644
--- a/src/glsl/opt_algebraic.cpp
+++ b/src/glsl/opt_algebraic.cpp
@@ -547,6 +547,19 @@ ir_algebraic_visitor::handle_expression(ir_expression *ir)
break;
+ case ir_triop_fma:
+ /* Operands are op0 * op1 + op2. */
+ if (is_vec_zero(op_const[0]) || is_vec_zero(op_const[1])) {
+ return ir->operands[2];
+ } else if (is_vec_zero(op_const[2])) {
+ return mul(ir->operands[0], ir->operands[1]);
+ } else if (is_vec_one(op_const[0])) {
+ return add(ir->operands[1], ir->operands[2]);
+ } else if (is_vec_one(op_const[1])) {
+ return add(ir->operands[0], ir->operands[2]);
+ }
+ break;
+
case ir_triop_lrp:
/* Operands are (x, y, a). */
if (is_vec_zero(op_const[2])) {
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