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nir_lower_bit_size: Support lowering ops with differing source/dest sizes

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Specifically the bit-finding routines always return int32. Don't complain
about the dest already being 32 bits when lowering to 32 bits, and
don't bother casting the dest if it's already right.

Reviewed-by: Boris Brezillon <boris.brezillon@collabora.com>
Reviewed-by: Jason Ekstrand <jason@jlekstrand.net>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/6313>
This commit is contained in:
Jesse Natalie
2020-06-22 11:51:09 -07:00
committed by Marge Bot
parent 0d595f72b2
commit ea715741b5
1 changed files with 7 additions and 5 deletions
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6
src/compiler/nir/nir_lower_bit_size.c
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@@ -70,9 +70,13 @@ lower_instr(nir_builder *bld, nir_alu_instr *alu, unsigned bit_size)
/* Convert result back to the original bit-size */
if (dst_bit_size != bit_size) {
nir_alu_type type = nir_op_infos[op].output_type;
nir_ssa_def *dst = nir_convert_to_bit_size(bld, lowered_dst, type, dst_bit_size);
nir_ssa_def_rewrite_uses(&alu->dest.dest.ssa, nir_src_for_ssa(dst));
} else {
nir_ssa_def_rewrite_uses(&alu->dest.dest.ssa, nir_src_for_ssa(lowered_dst));
}
}
static bool
@@ -96,8 +100,6 @@ lower_impl(nir_function_impl *impl,
if (lower_bit_size == 0)
continue;
assert(lower_bit_size != alu->dest.dest.ssa.bit_size);
lower_instr(&b, alu, lower_bit_size);
progress = true;
}