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nir: Turn imov/fmov of undef into undef.

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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@whitecape.org>
Reviewed-by: Iago Toral Quiroga <itoral@igalia.com>
This commit is contained in:
Kenneth Graunke 2016-07-29 01:29:10 -07:00
parent 12a912586f
commit 6aa730000f
1 changed files with 3 additions and 1 deletions
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4
src/compiler/nir/nir_opt_undef.c
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@ -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);