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 <[email protected]>
Reviewed-by: Paul Berry <[email protected]>

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 56284d94e0b..7064910281f 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;
             }