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-rw-r--r--src/mesa/state_tracker/st_glsl_to_tgsi.cpp6
1 files changed, 3 insertions, 3 deletions
diff --git a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
index 0772b736275..fa51fef343b 100644
--- a/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
+++ b/src/mesa/state_tracker/st_glsl_to_tgsi.cpp
@@ -5252,7 +5252,7 @@ glsl_to_tgsi_visitor::merge_two_dsts(void)
defined = 0;
inst2 = (glsl_to_tgsi_instruction *) inst->next;
- do {
+ while (!inst2->is_tail_sentinel()) {
if (inst->op == inst2->op &&
inst2->dst[defined].file == PROGRAM_UNDEFINED &&
inst->src[0].file == inst2->src[0].file &&
@@ -5261,9 +5261,9 @@ glsl_to_tgsi_visitor::merge_two_dsts(void)
inst->src[0].swizzle == inst2->src[0].swizzle)
break;
inst2 = (glsl_to_tgsi_instruction *) inst2->next;
- } while (inst2);
+ }
- if (!inst2) {
+ if (inst2->is_tail_sentinel()) {
/* Undefined destinations are not allowed, substitute with an unused
* temporary register.
*/