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nir: optimise min/max fadd combos

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shader-db results BDW:

total instructions in shared programs: 13060410 -> 13060313 (-0.00%)
instructions in affected programs: 24533 -> 24436 (-0.40%)
helped: 88
HURT: 0

total cycles in shared programs: 256585692 -> 256586698 (0.00%)
cycles in affected programs: 647290 -> 648296 (0.16%)
helped: 35
HURT: 30

Reviewed-by: Matt Turner <mattst88@gmail.com>
This commit is contained in:
Timothy Arceri
2017-01-12 21:51:56 +11:00
parent 0d5071db5e
commit 772cd31048
2 changed files with 26 additions and 0 deletions
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22
src/compiler/nir/nir_search_helpers.h
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@@ -130,6 +130,28 @@ is_used_more_than_once(nir_alu_instr *instr)
return true;
}
static inline bool
is_used_once(nir_alu_instr *instr)
{
bool zero_if_use = list_empty(&instr->dest.dest.ssa.if_uses);
bool zero_use = list_empty(&instr->dest.dest.ssa.uses);
if (zero_if_use && zero_use)
return false;
if (!zero_if_use && list_is_singular(&instr->dest.dest.ssa.uses))
return false;
if (!zero_use && list_is_singular(&instr->dest.dest.ssa.if_uses))
return false;
if (!list_is_singular(&instr->dest.dest.ssa.if_uses) &&
!list_is_singular(&instr->dest.dest.ssa.uses))
return false;
return true;
}
static inline bool
is_not_used_by_if(nir_alu_instr *instr)
{