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nir/algebraic: optimize a*#b & -4 

fossil-db (Sienna Cichlid):
Totals from 611 (0.47% of 128647) affected shaders:
CodeSize: 3096680 -> 3090976 (-0.18%)
Instrs: 570494 -> 569249 (-0.22%)
Latency: 5765865 -> 5759619 (-0.11%)
InvThroughput: 969840 -> 967608 (-0.23%)
VClause: 9690 -> 9688 (-0.02%)
Copies: 42884 -> 42894 (+0.02%); split: -0.01%, +0.03%
PreVGPRs: 28290 -> 28288 (-0.01%)

Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/13752>
This commit is contained in:
Rhys Perry 2021-11-11 11:16:06 +00:00 committed by Marge Bot
parent 2368c36427
commit a2d8c5b26d
2 changed files with 26 additions and 0 deletions
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5
src/compiler/nir/nir_opt_algebraic.py
View File

@ -408,6 +408,11 @@ for size, mask in ((8, 0xff), (16, 0xffff), (32, 0xffffffff), (64, 0xfffffffffff
(('ushr', ('ishl', a_sz, '#b'), b), ('iand', a, ('ushr', mask, b))),
])
optimizations.extend([
(('iand', ('ishl', 'a@32', '#b(is_first_5_bits_uge_2)'), -4), ('ishl', a, b)),
(('iand', ('imul', a, '#b(is_unsigned_multiple_of_4)'), -4), ('imul', a, b)),
])
for log2 in range(1, 7): # powers of two from 2 to 64
v = 1 << log2
mask = 0xffffffff & ~(v - 1)

21
src/compiler/nir/nir_search_helpers.h
View File

@ -226,6 +226,27 @@ is_ult_0xfffc07fc(UNUSED struct hash_table *ht, const nir_alu_instr *instr,
return true;
}
/** Is the first 5 bits of value unsigned greater than or equal 2? */
static inline bool
is_first_5_bits_uge_2(UNUSED struct hash_table *ht, const nir_alu_instr *instr,
unsigned src, unsigned num_components,
const uint8_t *swizzle)
{
/* only constant srcs: */
if (!nir_src_is_const(instr->src[src].src))
return false;
for (unsigned i = 0; i < num_components; i++) {
const unsigned val =
nir_src_comp_as_uint(instr->src[src].src, swizzle[i]);
if ((val & 0x1f) < 2)
return false;
}
return true;
}
static inline bool
is_not_const(UNUSED struct hash_table *ht, const nir_alu_instr *instr,
unsigned src, UNUSED unsigned num_components,