nir/lower_bit_size: fix lowering of {imul,umul}_high
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>
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@ -70,8 +70,18 @@ lower_instr(nir_builder *bld, nir_alu_instr *alu, unsigned bit_size)
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}
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/* Emit the lowered ALU instruction */
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nir_ssa_def *lowered_dst =
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nir_build_alu(bld, op, srcs[0], srcs[1], srcs[2], srcs[3]);
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nir_ssa_def *lowered_dst = NULL;
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if (op == nir_op_imul_high || op == nir_op_umul_high) {
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assert(dst_bit_size * 2 <= bit_size);
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nir_ssa_def *lowered_dst = nir_imul(bld, srcs[0], srcs[1]);
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if (nir_op_infos[op].output_type & nir_type_uint)
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lowered_dst = nir_ushr(bld, lowered_dst, nir_imm_int(bld, dst_bit_size));
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else
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lowered_dst = nir_ishr(bld, lowered_dst, nir_imm_int(bld, dst_bit_size));
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} else {
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lowered_dst = nir_build_alu(bld, op, srcs[0], srcs[1], srcs[2], srcs[3]);
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}
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/* Convert result back to the original bit-size */
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nir_alu_type type = nir_op_infos[op].output_type;
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