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nir: simplify nir_addition_might_overflow

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nir_unsigned_upper_bound is good enough that this isn't needed anymore.

No fossil-db changes.

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 2025-06-12 17:22:15 +01:00 • committed by Marge Bot
parent f3b7ac730c
commit ea0670dfb5
1 changed files with 0 additions and 34 deletions
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34
src/compiler/nir/nir_range_analysis.c
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@ -2093,40 +2093,6 @@ nir_addition_might_overflow(nir_shader *shader, struct hash_table *range_ht,
nir_scalar ssa, unsigned const_val,
const nir_unsigned_upper_bound_config *config)
{
if (nir_scalar_is_alu(ssa)) {
nir_op alu_op = nir_scalar_alu_op(ssa);
/* iadd(imul(a, #b), #c) */
if (alu_op == nir_op_imul || alu_op == nir_op_ishl) {
nir_scalar mul_src0 = nir_scalar_chase_alu_src(ssa, 0);
nir_scalar mul_src1 = nir_scalar_chase_alu_src(ssa, 1);
uint32_t stride = 1;
if (nir_scalar_is_const(mul_src0))
stride = nir_scalar_as_uint(mul_src0);
else if (nir_scalar_is_const(mul_src1))
stride = nir_scalar_as_uint(mul_src1);
if (alu_op == nir_op_ishl)
stride = 1u << (stride % 32u);
if (!stride || const_val <= UINT32_MAX - (UINT32_MAX / stride * stride))
return false;
}
/* iadd(iand(a, #b), #c) */
if (alu_op == nir_op_iand) {
nir_scalar and_src0 = nir_scalar_chase_alu_src(ssa, 0);
nir_scalar and_src1 = nir_scalar_chase_alu_src(ssa, 1);
uint32_t mask = 0xffffffff;
if (nir_scalar_is_const(and_src0))
mask = nir_scalar_as_uint(and_src0);
else if (nir_scalar_is_const(and_src1))
mask = nir_scalar_as_uint(and_src1);
if (mask == 0 || const_val < (1u << (ffs(mask) - 1)))
return false;
}
}
uint32_t ub = nir_unsigned_upper_bound(shader, range_ht, ssa, config);
return const_val + ub < const_val;
}