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.
---
src/mesa/program/ir_to_mesa.cpp | 2 ++
1 file changed, 2 insertions(+)
diff --git a/src/mesa/program/ir_to_mesa.cpp b/src/mesa/program/ir_to_mesa.cpp
index 14cf5ba..dff1762 100644
--- a/src/mesa/program/ir_to_mesa.cpp
+++ b/src/mesa/program/ir_to_mesa.cpp
@@ -2757,6 +2757,8 @@ 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 &&
--
1.8.1.2
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