Mesa (master): nir: Turn imov/fmov of undef into undef.

[Kenneth Graunke]

Module: Mesa
Branch: master
Commit: 6aa730000fea84a14b49828a4bb30761d43903bf
URL:    http://cgit.freedesktop.org/mesa/mesa/commit/?id=6aa730000fea84a14b49828a4bb30761d43903bf

Author: Kenneth Graunke <kenneth at whitecape.org>
Date:   Fri Jul 29 01:29:10 2016 -0700

nir: Turn imov/fmov of undef into undef.

On Broadwell:

total instructions in shared programs: 11640214 -> 11639872 (-0.00%)
instructions in affected programs: 17744 -> 17402 (-1.93%)
helped: 78
HURT: 0

total spills in shared programs: 2924 -> 2922 (-0.07%)
spills in affected programs: 104 -> 102 (-1.92%)
helped: 1
HURT: 0

total fills in shared programs: 4394 -> 4389 (-0.11%)
fills in affected programs: 237 -> 232 (-2.11%)
helped: 1
HURT: 0

Signed-off-by: Kenneth Graunke <kenneth at whitecape.org>
Reviewed-by: Iago Toral Quiroga <itoral at igalia.com>

---

 src/compiler/nir/nir_opt_undef.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/src/compiler/nir/nir_opt_undef.c b/src/compiler/nir/nir_opt_undef.c
index c4777a8..0f8ba31 100644
--- a/src/compiler/nir/nir_opt_undef.c
+++ b/src/compiler/nir/nir_opt_undef.c
@@ -79,7 +79,9 @@ opt_undef_vecN(nir_builder *b, nir_alu_instr *alu)
 {
    if (alu->op != nir_op_vec2 &&
        alu->op != nir_op_vec3 &&
-       alu->op != nir_op_vec4)
+       alu->op != nir_op_vec4 &&
+       alu->op != nir_op_fmov &&
+       alu->op != nir_op_imov)
       return false;
 
    assert(alu->dest.dest.is_ssa);