From: Matt Turner <mattst88@gmail.com>
Date: Thu, 4 Dec 2014 07:32:30 +0000 (-0800)
Subject: i965/vec4: Don't DCE flag-writing insts because dest was unused.
X-Git-Url: https://git.libre-soc.org/?a=commitdiff_plain;h=15f6118b77cbe42fb997174715bce4c2548aa1f1;p=mesa.git

i965/vec4: Don't DCE flag-writing insts because dest was unused.

Reviewed-by: Jason Ekstrand <jason.ekstrand@intel.com>
---

diff --git a/src/mesa/drivers/dri/i965/brw_vec4_dead_code_eliminate.cpp b/src/mesa/drivers/dri/i965/brw_vec4_dead_code_eliminate.cpp
index b8370ba63ec..9604e608778 100644
--- a/src/mesa/drivers/dri/i965/brw_vec4_dead_code_eliminate.cpp
+++ b/src/mesa/drivers/dri/i965/brw_vec4_dead_code_eliminate.cpp
@@ -103,7 +103,7 @@ vec4_visitor::dead_code_eliminate()
                   progress = true;
 
                   if (inst->dst.writemask == 0) {
-                     if (inst->writes_accumulator) {
+                     if (inst->writes_accumulator || inst->writes_flag()) {
                         inst->dst = dst_reg(retype(brw_null_reg(), inst->dst.type));
                      } else {
                         inst->opcode = BRW_OPCODE_NOP;