From: Kristian Høgsberg <krh@bitplanet.net>
Date: Tue, 28 Oct 2014 06:42:41 +0000 (-0700)
Subject: i965: Don't copy propagate constants from sources with saturate
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=840e8fc9203390615f051259efeab0f61f48bbfc;p=mesa.git

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 e1989cb5e4c..611cff13846 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)