From 6d792989924ce79363f181462904fa46692a99b5 Mon Sep 17 00:00:00 2001 From: Rhys Perry Date: Tue, 31 Mar 2020 13:52:43 +0100 Subject: [PATCH] nir/lower_bit_size: fix lowering of {imul,umul}_high Signed-off-by: Rhys Perry Reviewed-by: Erik Faye-Lund Part-of: --- src/compiler/nir/nir_lower_bit_size.c | 14 ++++++++++++-- 1 file changed, 12 insertions(+), 2 deletions(-) diff --git a/src/compiler/nir/nir_lower_bit_size.c b/src/compiler/nir/nir_lower_bit_size.c index 3ba63c81adc..100ac4864a5 100644 --- a/src/compiler/nir/nir_lower_bit_size.c +++ b/src/compiler/nir/nir_lower_bit_size.c @@ -70,8 +70,18 @@ lower_instr(nir_builder *bld, nir_alu_instr *alu, unsigned bit_size) } /* Emit the lowered ALU instruction */ - nir_ssa_def *lowered_dst = - nir_build_alu(bld, op, srcs[0], srcs[1], srcs[2], srcs[3]); + nir_ssa_def *lowered_dst = NULL; + if (op == nir_op_imul_high || op == nir_op_umul_high) { + assert(dst_bit_size * 2 <= bit_size); + nir_ssa_def *lowered_dst = nir_imul(bld, srcs[0], srcs[1]); + if (nir_op_infos[op].output_type & nir_type_uint) + lowered_dst = nir_ushr(bld, lowered_dst, nir_imm_int(bld, dst_bit_size)); + else + lowered_dst = nir_ishr(bld, lowered_dst, nir_imm_int(bld, dst_bit_size)); + } else { + lowered_dst = nir_build_alu(bld, op, srcs[0], srcs[1], srcs[2], srcs[3]); + } + /* Convert result back to the original bit-size */ nir_alu_type type = nir_op_infos[op].output_type; -- 2.30.2