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Revert "Add support for combining GEPs across PHI nodes"
This reverts commit r209755. it was the real cause of the libc++ build failure. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@209775 91177308-0d34-0410-b5e6-96231b3b80d8
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@ -1220,85 +1220,6 @@ Instruction *InstCombiner::visitGetElementPtrInst(GetElementPtrInst &GEP) {
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if (MadeChange) return &GEP;
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}
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// Check to see if the inputs to the PHI node are getelementptr instructions.
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if (PHINode *PN = dyn_cast<PHINode>(PtrOp)) {
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GetElementPtrInst *Op1 = dyn_cast<GetElementPtrInst>(PN->getOperand(0));
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if (!Op1)
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return nullptr;
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signed DI = -1;
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for (auto I = PN->op_begin()+1, E = PN->op_end(); I !=E; ++I) {
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GetElementPtrInst *Op2 = dyn_cast<GetElementPtrInst>(*I);
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if (!Op2 || Op1->getNumOperands() != Op2->getNumOperands())
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return nullptr;
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for (unsigned J = 0, F = Op1->getNumOperands(); J != F; ++J) {
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if (Op1->getOperand(J)->getType() != Op2->getOperand(J)->getType())
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return nullptr;
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if (Op1->getOperand(J) != Op2->getOperand(J)) {
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if (DI == -1) {
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// We have not seen any differences yet in the GEPs feeding the
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// PHI yet, so we record this one if it is allowed to be a
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// variable.
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// The first two arguments can vary for any GEP, the rest have to be
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// static for struct slots
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if (J > 1) {
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SmallVector<Value*, 8> Idxs(GEP.idx_begin(), GEP.idx_begin()+J);
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Type *Ty =
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GetElementPtrInst::getIndexedType(Op1->getOperand(0)->getType(),
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Idxs);
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if (Ty->isStructTy())
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return nullptr;
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}
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DI = J;
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} else {
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// The GEP is different by more than one input. While this could be
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// extended to support GEPs that vary by more than one variable it
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// doesn't make sense since it greatly increases the complexity and
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// would result in an R+R+R addressing mode which no backend
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// directly supports and would need to be broken into several
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// simpler instructions anyway.
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return nullptr;
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}
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}
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}
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}
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GetElementPtrInst *NewGEP = cast<GetElementPtrInst>(Op1->clone());
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if (DI == -1) {
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// All the GEPs feeding the PHI are identical. Clone one down into our
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// BB so that it can be merged with the current GEP.
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GEP.getParent()->getInstList().insert(GEP.getParent()->getFirstNonPHI(),
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NewGEP);
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} else {
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// All the GEPs feeding the PHI differ at a single offset. Clone a GEP
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// into the current block so it can be merged, and create a new PHI to
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// set that index.
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Instruction *InsertPt = Builder->GetInsertPoint();
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Builder->SetInsertPoint(PN);
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PHINode *NewPN = Builder->CreatePHI(Op1->getOperand(DI)->getType(),
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PN->getNumOperands());
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Builder->SetInsertPoint(InsertPt);
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for (auto &I : PN->operands())
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NewPN->addIncoming(cast<GEPOperator>(I)->getOperand(DI),
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PN->getIncomingBlock(I));
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NewGEP->setOperand(DI, NewPN);
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GEP.getParent()->getInstList().insert(GEP.getParent()->getFirstNonPHI(),
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NewGEP);
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NewGEP->setOperand(DI, NewPN);
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}
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GEP.setOperand(0, NewGEP);
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PtrOp = NewGEP;
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}
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// Combine Indices - If the source pointer to this getelementptr instruction
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// is a getelementptr instruction, combine the indices of the two
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// getelementptr instructions into a single instruction.
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@ -1,56 +0,0 @@
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; RUN: opt -instcombine -S < %s | FileCheck %s
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%struct1 = type { %struct2*, i32, i32, i32 }
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%struct2 = type { i32, i32 }
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define i32 @test1(%struct1* %dm, i1 %tmp4, i64 %tmp9, i64 %tmp19) {
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bb:
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%tmp = getelementptr inbounds %struct1* %dm, i64 0, i32 0
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%tmp1 = load %struct2** %tmp, align 8
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br i1 %tmp4, label %bb1, label %bb2
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bb1:
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%tmp10 = getelementptr inbounds %struct2* %tmp1, i64 %tmp9
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%tmp11 = getelementptr inbounds %struct2* %tmp10, i64 0, i32 0
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store i32 0, i32* %tmp11, align 4
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br label %bb3
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bb2:
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%tmp20 = getelementptr inbounds %struct2* %tmp1, i64 %tmp19
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%tmp21 = getelementptr inbounds %struct2* %tmp20, i64 0, i32 0
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store i32 0, i32* %tmp21, align 4
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br label %bb3
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bb3:
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%phi = phi %struct2* [ %tmp10, %bb1 ], [ %tmp20, %bb2 ]
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%tmp24 = getelementptr inbounds %struct2* %phi, i64 0, i32 1
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%tmp25 = load i32* %tmp24, align 4
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ret i32 %tmp25
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; CHECK-LABEL: @test1(
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; CHECK: getelementptr inbounds %struct2* %tmp1, i64 %tmp9, i32 0
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; CHECK: getelementptr inbounds %struct2* %tmp1, i64 %tmp19, i32 0
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; CHECK: %[[PHI:[0-9A-Za-z]+]] = phi i64 [ %tmp9, %bb1 ], [ %tmp19, %bb2 ]
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; CHECK: getelementptr inbounds %struct2* %tmp1, i64 %[[PHI]], i32 1
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}
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define i32 @test2(%struct1* %dm, i1 %tmp4, i64 %tmp9, i64 %tmp19) {
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bb:
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%tmp = getelementptr inbounds %struct1* %dm, i64 0, i32 0
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%tmp1 = load %struct2** %tmp, align 8
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%tmp10 = getelementptr inbounds %struct2* %tmp1, i64 %tmp9
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%tmp11 = getelementptr inbounds %struct2* %tmp10, i64 0, i32 0
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store i32 0, i32* %tmp11, align 4
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%tmp20 = getelementptr inbounds %struct2* %tmp1, i64 %tmp19
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%tmp21 = getelementptr inbounds %struct2* %tmp20, i64 0, i32 0
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store i32 0, i32* %tmp21, align 4
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%tmp24 = getelementptr inbounds %struct2* %tmp10, i64 0, i32 1
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%tmp25 = load i32* %tmp24, align 4
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ret i32 %tmp25
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; CHECK-LABEL: @test2(
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; CHECK: getelementptr inbounds %struct2* %tmp1, i64 %tmp9, i32 0
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; CHECK: getelementptr inbounds %struct2* %tmp1, i64 %tmp19, i32 0
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; CHECK: getelementptr inbounds %struct2* %tmp1, i64 %tmp9, i32 1
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}
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