There may not be a previous block. In this case, there's no real work
to do, so just continue on to the next one.
v2: Update for bblock->prev() API change.
Signed-off-by: Kenneth Graunke <kenn...@whitecape.org>
---
src/mesa/drivers/dri/i965/brw_dead_control_flow.cpp | 4 ++++
1 file changed, 4 insertions(+)
diff --git a/src/mesa/drivers/dri/i965/brw_dead_control_flow.cpp
b/src/mesa/drivers/dri/i965/brw_dead_control_flow.cpp
index 2c1abaf..114dc6c 100644
--- a/src/mesa/drivers/dri/i965/brw_dead_control_flow.cpp
+++ b/src/mesa/drivers/dri/i965/brw_dead_control_flow.cpp
@@ -42,6 +42,10 @@ dead_control_flow_eliminate(backend_shader *s)
foreach_block_safe (block, s->cfg) {
bblock_t *prev_block = block->prev();
+
+ if (!prev_block)
+ continue;
+
backend_instruction *const inst = block->start();
backend_instruction *const prev_inst = prev_block->end();
--
2.7.4
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