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nir/lower_bit_size: fix lowering of shifts

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Signed-off-by: Rhys Perry <pendingchaos02@gmail.com>
Reviewed-by: Erik Faye-Lund <erik.faye-lund@collabora.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/4387>
This commit is contained in:
Rhys Perry
2020-03-31 13:51:32 +01:00
committed by Marge Bot
parent 58f25098a0
commit 715ef95700
1 changed files with 9 additions and 4 deletions
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13
src/compiler/nir/nir_lower_bit_size.c
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@@ -48,6 +48,7 @@ static void
lower_instr(nir_builder *bld, nir_alu_instr *alu, unsigned bit_size)
{
const nir_op op = alu->op;
unsigned dst_bit_size = alu->dest.dest.ssa.bit_size;
bld->cursor = nir_before_instr(&alu->instr);
@@ -58,9 +59,14 @@ lower_instr(nir_builder *bld, nir_alu_instr *alu, unsigned bit_size)
nir_alu_type type = nir_op_infos[op].input_types[i];
if (nir_alu_type_get_type_size(type) == 0)
srcs[i] = convert_to_bit_size(bld, src, type, bit_size);
else
srcs[i] = src;
src = convert_to_bit_size(bld, src, type, bit_size);
if (i == 1 && (op == nir_op_ishl || op == nir_op_ishr || op == nir_op_ushr)) {
assert(util_is_power_of_two_nonzero(dst_bit_size));
src = nir_iand(bld, src, nir_imm_int(bld, dst_bit_size - 1));
}
srcs[i] = src;
}
/* Emit the lowered ALU instruction */
@@ -68,7 +74,6 @@ lower_instr(nir_builder *bld, nir_alu_instr *alu, unsigned bit_size)
nir_build_alu(bld, op, srcs[0], srcs[1], srcs[2], srcs[3]);
/* Convert result back to the original bit-size */
unsigned dst_bit_size = alu->dest.dest.ssa.bit_size;
nir_alu_type type = nir_op_infos[op].output_type;
nir_ssa_def *dst = 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));