Mesa (master): i965/fs: Walk instructions in reverse in saturate propagation.

[Matt Turner]

Module: Mesa
Branch: master
Commit: 82bdb559a160129774d2e2f235cb2b18c907d713
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=82bdb559a160129774d2e2f235cb2b18c907d713

Author: Matt Turner <mattst88 at gmail.com>
Date:   Mon Sep  8 12:05:25 2014 -0700

i965/fs: Walk instructions in reverse in saturate propagation.

When we find a mov.sat, we search backwards. We might as well search
everything else backwards as well and potentially look at fewer
instructions.

This change enables the next patch.

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

---

 src/mesa/drivers/dri/i965/brw_fs_saturate_propagation.cpp |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/src/mesa/drivers/dri/i965/brw_fs_saturate_propagation.cpp b/src/mesa/drivers/dri/i965/brw_fs_saturate_propagation.cpp
index 4c4b6bf..6f8f8d0 100644
--- a/src/mesa/drivers/dri/i965/brw_fs_saturate_propagation.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs_saturate_propagation.cpp
@@ -32,10 +32,10 @@ static bool
 opt_saturate_propagation_local(fs_visitor *v, bblock_t *block)
 {
    bool progress = false;
-   int ip = block->start_ip - 1;
+   int ip = block->end_ip + 1;
 
-   foreach_inst_in_block(fs_inst, inst, block) {
-      ip++;
+   foreach_inst_in_block_reverse(fs_inst, inst, block) {
+      ip--;
 
       if (inst->opcode != BRW_OPCODE_MOV ||
           inst->dst.file != GRF ||