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AMDGPU: Fix mfma scale source legalization #117238

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Nov 21, 2024
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AMDGPU: Fix mfma scale source legalization #117238

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5 changes: 2 additions & 3 deletions llvm/lib/Target/AMDGPU/SIISelLowering.cpp
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Original file line number Diff line number Diff line change
Expand Up @@ -15462,9 +15462,8 @@ void SITargetLowering::AdjustInstrPostInstrSelection(MachineInstr &MI,
int Src0Idx = AMDGPU::getNamedOperandIdx(MI.getOpcode(),
AMDGPU::OpName::scale_src0);
if (Src0Idx != -1) {
int Src1Idx = Src0Idx + 2;
assert(Src1Idx = AMDGPU::getNamedOperandIdx(
MI.getOpcode(), AMDGPU::OpName::scale_src1));
int Src1Idx = AMDGPU::getNamedOperandIdx(MI.getOpcode(),
AMDGPU::OpName::scale_src1);
if (TII->usesConstantBus(MRI, MI, Src0Idx) &&
TII->usesConstantBus(MRI, MI, Src1Idx))
TII->legalizeOpWithMove(MI, Src1Idx);
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