Mesa (master): i965/fs: Allow constant propagation into IF with embedded compare.
Eric Anholt
anholt at kemper.freedesktop.org
Thu Dec 29 17:45:47 UTC 2011
Module: Mesa
Branch: master
Commit: 069901e2f5a8f4a58047d25335f2526f1acc7234
URL: http://cgit.freedesktop.org/mesa/mesa/commit/?id=069901e2f5a8f4a58047d25335f2526f1acc7234
Author: Eric Anholt <eric at anholt.net>
Date: Mon Dec 19 09:20:57 2011 -0800
i965/fs: Allow constant propagation into IF with embedded compare.
This saves a couple of instructions on most programs with control
flow. More interestingly, 6 shaders from unigine sanctuary now fit
into 16-wide without register spilling.
---
src/mesa/drivers/dri/i965/brw_fs.cpp | 1 +
1 files changed, 1 insertions(+), 0 deletions(-)
diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp b/src/mesa/drivers/dri/i965/brw_fs.cpp
index 8ca4a87..b6aa60e 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs.cpp
@@ -1144,6 +1144,7 @@ fs_visitor::propagate_constants()
break;
case BRW_OPCODE_CMP:
+ case BRW_OPCODE_IF:
if (i == 1) {
scan_inst->src[i] = inst->src[0];
progress = true;
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