According to page 360 of the textbook, the proper formula for liveout
is:
CPout(n) = COPY(i) union (CPin(i) - KILL(i))
Previously, we omitted COPY.
Signed-off-by: Kenneth Graunke <kenn...@whitecape.org>
---
src/mesa/drivers/dri/i965/brw_fs_copy_propagation.cpp | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/src/mesa/drivers/dri/i965/brw_fs_copy_propagation.cpp
b/src/mesa/drivers/dri/i965/brw_fs_copy_propagation.cpp
index 2ab7734..fd726e0 100644
--- a/src/mesa/drivers/dri/i965/brw_fs_copy_propagation.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs_copy_propagation.cpp
@@ -196,7 +196,8 @@ fs_copy_prop_dataflow::run()
for (int i = 0; i < bitset_words; i++) {
const BITSET_WORD old_liveout = bd[b].liveout[i];
- bd[b].liveout[i] |= bd[b].livein[i] & ~bd[b].kill[i];
+ bd[b].liveout[i] |=
+ bd[b].copy[i] | (bd[b].livein[i] & ~bd[b].kill[i]);
if (old_liveout != bd[b].liveout[i])
progress = true;
--
1.8.3.4
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