Mesa (master): mesa/program: Don't copy propagate from swizzles.
Ian Romanick
idr at kemper.freedesktop.org
Wed May 8 21:02:53 UTC 2013
Module: Mesa
Branch: master
Commit: 4e9c7f9c5ac7b2564c1c7299bf688595e1f88372
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=4e9c7f9c5ac7b2564c1c7299bf688595e1f88372
Author: Fabian Bieler <fabianbieler at fastmail.fm>
Date: Thu Apr 25 01:30:15 2013 +0200
mesa/program: Don't copy propagate from swizzles.
Do not propagate a copy if source and destination are identical.
Otherwise code like
MOV TEMP[0].xyzw, TEMP[0].wzyx
MOV TEMP[1].xyzw, TEMP[0].xyzw
is changed to
MOV TEMP[0].xyzw, TEMP[0].wzyx
MOV TEMP[1].xyzw, TEMP[0].wzyx
This fixes Piglit test shaders/glsl-copy-propagation-self-2 for drivers that
use Mesa IR.
NOTE: This is a candidate for the stable branches.
Signed-off-by: Fabian Bieler <fabianbieler at fastmail.fm>
Reviewed-by: Ian Romanick <ian.d.romanick at intel.com>
---
src/mesa/program/ir_to_mesa.cpp | 2 ++
1 files changed, 2 insertions(+), 0 deletions(-)
diff --git a/src/mesa/program/ir_to_mesa.cpp b/src/mesa/program/ir_to_mesa.cpp
index 0848462..363efe7 100644
--- a/src/mesa/program/ir_to_mesa.cpp
+++ b/src/mesa/program/ir_to_mesa.cpp
@@ -2768,6 +2768,8 @@ ir_to_mesa_visitor::copy_propagate(void)
/* If this is a copy, add it to the ACP. */
if (inst->op == OPCODE_MOV &&
inst->dst.file == PROGRAM_TEMPORARY &&
+ !(inst->dst.file == inst->src[0].file &&
+ inst->dst.index == inst->src[0].index) &&
!inst->dst.reladdr &&
!inst->saturate &&
!inst->src[0].reladdr &&
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