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nir: Support upper bound of unsigned bit size conversions.

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These allow us to generate slightly better code in some cases,
eg. multiplications in ACO.

Signed-off-by: Timur Kristóf <timur.kristof@gmail.com>
Reviewed-by: Daniel Schürmann <daniel@schuermann.dev>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/10740>
This commit is contained in:
Timur Kristóf
2021-04-23 08:48:46 +02:00
committed by Marge Bot
parent 9a2ffe1abb
commit e905e0938a
1 changed files with 15 additions and 0 deletions
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15
src/compiler/nir/nir_range_analysis.c
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@@ -1457,6 +1457,15 @@ nir_unsigned_upper_bound(nir_shader *shader, struct hash_table *range_ht,
case nir_op_f2u32:
case nir_op_fmul:
break;
case nir_op_u2u1:
case nir_op_u2u8:
case nir_op_u2u16:
case nir_op_u2u32:
if (nir_ssa_scalar_chase_alu_src(scalar, 0).def->bit_size > 32) {
/* If src is >32 bits, return max */
return max;
}
break;
default:
return max;
}
@@ -1570,6 +1579,12 @@ nir_unsigned_upper_bound(nir_shader *shader, struct hash_table *range_ht,
memcpy(&res, &max_f, 4);
}
break;
case nir_op_u2u1:
case nir_op_u2u8:
case nir_op_u2u16:
case nir_op_u2u32:
res = MIN2(src0, max);
break;
default:
res = max;
break;