We can't propagate the conditional modifier from one instruction to
another of a different execution size / group, since that would change
the channels affected by the conditional.
---
src/mesa/drivers/dri/i965/brw_vec4_cmod_propagation.cpp | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/src/mesa/drivers/dri/i965/brw_vec4_cmod_propagation.cpp
b/src/mesa/drivers/dri/i965/brw_vec4_cmod_propagation.cpp
index c531fba..4454cdb 100644
--- a/src/mesa/drivers/dri/i965/brw_vec4_cmod_propagation.cpp
+++ b/src/mesa/drivers/dri/i965/brw_vec4_cmod_propagation.cpp
@@ -76,7 +76,9 @@ opt_cmod_propagation_local(bblock_t *block)
scan_inst->dst.writemask != WRITEMASK_XYZW) ||
(scan_inst->dst.writemask == WRITEMASK_XYZW &&
inst->src[0].swizzle != BRW_SWIZZLE_XYZW) ||
- (inst->dst.writemask & ~scan_inst->dst.writemask) != 0) {
+ (inst->dst.writemask & ~scan_inst->dst.writemask) != 0 ||
+ scan_inst->exec_size != inst->exec_size ||
+ scan_inst->group != inst->group) {
break;
}
--
2.7.4
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