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[AMDGPU] Select mul_lohi to V_MAD_NC_{I|U}64_I32 on gfx1250 #153851

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Merged
merged 1 commit into from
Aug 15, 2025
Merged

[AMDGPU] Select mul_lohi to V_MAD_NC_{I|U}64_I32 on gfx1250 #153851

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21 changes: 14 additions & 7 deletions llvm/lib/Target/AMDGPU/AMDGPUISelDAGToDAG.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -1196,18 +1196,25 @@ void AMDGPUDAGToDAGISel::SelectMAD_64_32(SDNode *N) {
void AMDGPUDAGToDAGISel::SelectMUL_LOHI(SDNode *N) {
SDLoc SL(N);
bool Signed = N->getOpcode() == ISD::SMUL_LOHI;
SDVTList VTList;
unsigned Opc;
if (Subtarget->hasMADIntraFwdBug())
Opc = Signed ? AMDGPU::V_MAD_I64_I32_gfx11_e64
: AMDGPU::V_MAD_U64_U32_gfx11_e64;
else
Opc = Signed ? AMDGPU::V_MAD_I64_I32_e64 : AMDGPU::V_MAD_U64_U32_e64;
if (Subtarget->hasMadU64U32NoCarry()) {
VTList = CurDAG->getVTList(MVT::i64);
Opc = Signed ? AMDGPU::V_MAD_NC_I64_I32_e64 : AMDGPU::V_MAD_NC_U64_U32_e64;
} else {
VTList = CurDAG->getVTList(MVT::i64, MVT::i1);
if (Subtarget->hasMADIntraFwdBug()) {
Opc = Signed ? AMDGPU::V_MAD_I64_I32_gfx11_e64
: AMDGPU::V_MAD_U64_U32_gfx11_e64;
} else {
Opc = Signed ? AMDGPU::V_MAD_I64_I32_e64 : AMDGPU::V_MAD_U64_U32_e64;
}
}

SDValue Zero = CurDAG->getTargetConstant(0, SL, MVT::i64);
SDValue Clamp = CurDAG->getTargetConstant(0, SL, MVT::i1);
SDValue Ops[] = {N->getOperand(0), N->getOperand(1), Zero, Clamp};
SDNode *Mad = CurDAG->getMachineNode(
Opc, SL, CurDAG->getVTList(MVT::i64, MVT::i1), Ops);
SDNode *Mad = CurDAG->getMachineNode(Opc, SL, VTList, Ops);
if (!SDValue(N, 0).use_empty()) {
SDValue Sub0 = CurDAG->getTargetConstant(AMDGPU::sub0, SL, MVT::i32);
SDNode *Lo = CurDAG->getMachineNode(TargetOpcode::EXTRACT_SUBREG, SL,
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