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i965/fs: Optimize OR with identical sources into a MOV.
author
Matt Turner
<mattst88@gmail.com>
Mon, 28 Oct 2013 02:34:48 +0000
(19:34 -0700)
committer
Matt Turner
<mattst88@gmail.com>
Fri, 1 Nov 2013 22:21:07 +0000
(15:21 -0700)
Helps a lot of Steam games.
total instructions in shared programs:
1409360
->
1409124
(-0.02%)
instructions in affected programs: 20842 -> 20606 (-1.13%)
Reviewed-by: Eric Anholt <eric@anholt.net>
Reviewed-by: Paul Berry <stereotype441@gmail.com>
src/mesa/drivers/dri/i965/brw_fs.cpp
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diff --git
a/src/mesa/drivers/dri/i965/brw_fs.cpp
b/src/mesa/drivers/dri/i965/brw_fs.cpp
index
236e86c
..
2350cd0
100644
(file)
--- a/
src/mesa/drivers/dri/i965/brw_fs.cpp
+++ b/
src/mesa/drivers/dri/i965/brw_fs.cpp
@@
-1872,6
+1872,14
@@
fs_visitor::opt_algebraic()
break;
}
break;
+ case BRW_OPCODE_OR:
+ if (inst->src[0].equals(inst->src[1])) {
+ inst->opcode = BRW_OPCODE_MOV;
+ inst->src[1] = reg_undef;
+ progress = true;
+ break;
+ }
+ break;
default:
break;
}