fdo-mirrors/mesa
1
0
Fork 0
mirror of https://gitlab.freedesktop.org/mesa/mesa.git synced 2026-01-21 19:30:38 +01:00
Code Issues Projects Releases Packages Wiki Activity Actions 5

nir/uub: improve ishl/imul with constant sources

Browse source 
fossil-db (navi21):
Totals from 1 (0.00% of 79653) affected shaders:
Instrs: 1339 -> 1338 (-0.07%)
CodeSize: 7244 -> 7240 (-0.06%)
Latency: 19827 -> 19822 (-0.03%)
InvThroughput: 9913 -> 9911 (-0.02%)
SALU: 419 -> 418 (-0.24%)

Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Georg Lehmann <dadschoorse@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/35514>
This commit is contained in:
Rhys Perry 2025-06-13 11:06:49 +01:00 • committed by Marge Bot
parent 4a966fd28d
commit 8ee5440073
1 changed files with 18 additions and 1 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

19
src/compiler/nir/nir_range_analysis.c
View file

@ -1861,12 +1861,29 @@ get_alu_uub(struct analysis_state *state, struct uub_query q, uint32_t *result,
uint32_t src1 = MIN2(src[1], q.scalar.def->bit_size - 1u);
if (util_last_bit64(src[0]) + src1 <= q.scalar.def->bit_size) /* check overflow */
*result = src[0] << src1;
nir_scalar src1_scalar = nir_scalar_chase_alu_src(q.scalar, 1);
if (nir_scalar_is_const(src1_scalar)) {
uint32_t const_val = 1u << (nir_scalar_as_uint(src1_scalar) & (q.scalar.def->bit_size - 1u));
*result = MIN2(*result, max / const_val * const_val);
}
break;
}
case nir_op_imul:
case nir_op_imul: {
if (src[0] == 0 || (src[0] * src[1]) / src[0] == src[1]) /* check overflow */
*result = src[0] * src[1];
nir_scalar src0_scalar = nir_scalar_chase_alu_src(q.scalar, 0);
nir_scalar src1_scalar = nir_scalar_chase_alu_src(q.scalar, 1);
if (nir_scalar_is_const(src0_scalar)) {
uint32_t const_val = nir_scalar_as_uint(src0_scalar);
*result = MIN2(*result, max / const_val * const_val);
} else if (nir_scalar_is_const(src1_scalar)) {
uint32_t const_val = nir_scalar_as_uint(src1_scalar);
*result = MIN2(*result, max / const_val * const_val);
}
break;
}
case nir_op_ushr: {
nir_scalar src1_scalar = nir_scalar_chase_alu_src(q.scalar, 1);
uint32_t mask = q.scalar.def->bit_size - 1u;