From 954a012b4c75db77b99b259d9cc4edd8ab551c68 Mon Sep 17 00:00:00 2001 From: Matt Arsenault Date: Wed, 21 Aug 2019 16:59:10 +0000 Subject: GlobalISel: Implement moreElementsVector for G_UNMERGE_VALUES sources This is necessary for handling <3 x s16> on AMDGPU, assuming this should be handled as 2 separate legalization actions. The alternative would be for fewerElementsVector to handle 3->2. llvm-svn: 369547 --- llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp | 20 ++++++++++++++++++++ 1 file changed, 20 insertions(+) (limited to 'llvm/lib/CodeGen') diff --git a/llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp b/llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp index 4622248102e..dd78718422f 100644 --- a/llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp +++ b/llvm/lib/CodeGen/GlobalISel/LegalizerHelper.cpp @@ -3144,6 +3144,26 @@ LegalizerHelper::moreElementsVector(MachineInstr &MI, unsigned TypeIdx, moreElementsVectorDst(MI, MoreTy, 0); Observer.changedInstr(MI); return Legalized; + case TargetOpcode::G_UNMERGE_VALUES: { + if (TypeIdx != 1) + return UnableToLegalize; + + LLT DstTy = MRI.getType(MI.getOperand(0).getReg()); + int NumDst = MI.getNumOperands() - 1; + moreElementsVectorSrc(MI, MoreTy, NumDst); + + auto MIB = MIRBuilder.buildInstr(TargetOpcode::G_UNMERGE_VALUES); + for (int I = 0; I != NumDst; ++I) + MIB.addDef(MI.getOperand(I).getReg()); + + int NewNumDst = MoreTy.getSizeInBits() / DstTy.getSizeInBits(); + for (int I = NumDst; I != NewNumDst; ++I) + MIB.addDef(MRI.createGenericVirtualRegister(DstTy)); + + MIB.addUse(MI.getOperand(NumDst).getReg()); + MI.eraseFromParent(); + return Legalized; + } case TargetOpcode::G_PHI: return moreElementsVectorPhi(MI, TypeIdx, MoreTy); default: -- cgit v1.2.3