On Thu, Dec 4, 2014 at 10:02 PM, Kristian Høgsberg k...@bitplanet.net
wrote:
We don't propagate the saturate bit and some instructions can't
saturate at all. If the source has saturate set, just skip propagation.
I think the commit message could use some help.
The real point is that copy propagation propagates into sources but sat is
a destination modier. The only way you can propagate a mov.sat is into
another mov by making it a mov.sat.
Signed-off-by: Kristian Høgsberg k...@bitplanet.net
---
src/mesa/drivers/dri/i965/brw_fs_copy_propagation.cpp | 2 ++
1 file changed, 2 insertions(+)
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 e1989cb..611cff1 100644
--- a/src/mesa/drivers/dri/i965/brw_fs_copy_propagation.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs_copy_propagation.cpp
@@ -425,6 +425,8 @@ fs_visitor::try_constant_propagate(fs_inst *inst,
acp_entry *entry)
if (entry-src.file != IMM)
return false;
+ if (entry-saturate)
+ return false;
for (int i = inst-sources - 1; i = 0; i--) {
if (inst-src[i].file != GRF)
--
2.2.0
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