i965: Don't copy propagate constants from sources with saturate

We don't propagate the saturate bit and some instructions can't
saturate at all.  If the source has saturate set, just skip propagation.

Signed-off-by: Kristian Høgsberg <krh@bitplanet.net>
Reviewed-by: Kenneth Graunke <kenneth@whitecape.org>

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 (file)
--- 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)