Mesa (master): i965/fs: Optimize saturating SEL.G(E) with imm val <= 0.0f.

[Matt Turner]

Module: Mesa
Branch: master
Commit: 3c28b2c09f491bfa55dc9e5d7858a8b900c25432
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=3c28b2c09f491bfa55dc9e5d7858a8b900c25432

Author: Matt Turner <mattst88 at gmail.com>
Date:   Sun Oct 27 21:26:36 2013 -0700

i965/fs: Optimize saturating SEL.G(E) with imm val <= 0.0f.

Only one program's instruction count is changed, but a shader in Tropics
is also affected.

instructions in affected programs:     326 -> 320 (-1.84%)

Reviewed-by: Eric Anholt <eric at anholt.net>
Reviewed-by: Paul Berry <stereotype441 at gmail.com>

---

 src/mesa/drivers/dri/i965/brw_fs.cpp |   14 ++++++++++++++
 1 files changed, 14 insertions(+), 0 deletions(-)

diff --git a/src/mesa/drivers/dri/i965/brw_fs.cpp b/src/mesa/drivers/dri/i965/brw_fs.cpp
index 56284d9..7064910 100644
--- a/src/mesa/drivers/dri/i965/brw_fs.cpp
+++ b/src/mesa/drivers/dri/i965/brw_fs.cpp
@@ -1897,6 +1897,20 @@ fs_visitor::opt_algebraic()
                   break;
                }
                break;
+            case BRW_CONDITIONAL_GE:
+            case BRW_CONDITIONAL_G:
+               switch (inst->src[1].type) {
+               case BRW_REGISTER_TYPE_F:
+                  if (inst->src[1].imm.f <= 0.0f) {
+                     inst->opcode = BRW_OPCODE_MOV;
+                     inst->src[1] = reg_undef;
+                     inst->conditional_mod = BRW_CONDITIONAL_NONE;
+                     progress = true;
+                  }
+                  break;
+               default:
+                  break;
+               }
             default:
                break;
             }