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nir/lower_bit_size: Fix subgroup lowering for floats

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Using u2u is always correct for integers, including signed integers,
because we're doing a down-cast.  It's wrong for floats, though.

Fixes: f95665cfeb ("nir/lower_bit_size: Add support for lowering subgroup ops")
Reviewed-by: Daniel Schürmann <daniel@schuermann.dev>
Reviewed-by: Timur Kristóf <timur.kristof@gmail.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/25894>
This commit is contained in:
Faith Ekstrand 2023-10-26 08:01:15 -05:00 • committed by Marge Bot
parent 16664b74a2
commit 5979e74177
1 changed files with 1 additions and 1 deletions
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src/compiler/nir/nir_lower_bit_size.c
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@ -203,7 +203,7 @@ lower_intrinsic_instr(nir_builder *b, nir_intrinsic_instr *intrin,
if (intrin->intrinsic != nir_intrinsic_vote_feq &&
intrin->intrinsic != nir_intrinsic_vote_ieq)
res = nir_u2uN(b, res, old_bit_size);
res = nir_convert_to_bit_size(b, res, type, old_bit_size);
nir_def_rewrite_uses(&intrin->def, res);
break;