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
---
src/mesa/state_tracker/st_glsl_to_tgsi.cpp | 2 ++
1 file changed, 2 insertions(+)
diff --git a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
index f2eb3e7..b5d0534 100644
--- a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
+++ b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
@@ -3544,6 +3544,8 @@ glsl_to_tgsi_visitor::copy_propagate(void)
/* If this is a copy, add it to the ACP. */
if (inst->op == TGSI_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 &&
--
1.7.10.4
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