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nir/uub: fix exclusive scans

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Reviewed-by: Rhys Perry <pendingchaos02@gmail.com>

Cc: mesa-stable
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/36874>
This commit is contained in:
Georg Lehmann 2025-08-20 12:29:03 +02:00 • committed by Marge Bot
parent c7e48f79b7
commit a2e48d2ede
1 changed files with 7 additions and 0 deletions
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7
src/compiler/nir/nir_range_analysis.c
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@ -1751,12 +1751,19 @@ get_intrinsic_uub(struct analysis_state *state, struct uub_query q, uint32_t *re
case nir_intrinsic_inclusive_scan:
case nir_intrinsic_exclusive_scan: {
nir_op op = nir_intrinsic_reduction_op(intrin);
unsigned bit_size = q.scalar.def->bit_size;
bool exclusive = intrin->intrinsic == nir_intrinsic_exclusive_scan;
if (op == nir_op_umin || op == nir_op_umax || op == nir_op_imin || op == nir_op_imax) {
if (!q.head.pushed_queries) {
push_uub_query(state, nir_get_scalar(intrin->src[0].ssa, q.scalar.comp));
return;
} else {
*result = src[0];
if (exclusive) {
uint32_t identity = nir_const_value_as_uint(nir_alu_binop_identity(op, bit_size), bit_size);
*result = MAX2(*result, identity);
}
}
}
break;