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Pull in r327638 from upstream llvm trunk (by Matthew Simpson):

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[ConstantFolding, InstSimplify] Handle more vector GEPs

  This patch addresses some additional cases where the compiler crashes
  upon encountering vector GEPs. This should fix PR36116.

  Differential Revision: https://reviews.llvm.org/D44219
  Reference: https://bugs.llvm.org/show_bug.cgi?id=36116

This fixes an assertion when building the emulators/snes9x port.

Reported by:	jbeich
PR:		225471
MFC after:	3 months
X-MFC-With:	r327952
This commit is contained in:
Dimitry Andric 2018-03-16 17:50:44 +00:00
parent 29c29cbb40
commit 077d36ae02
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=331065
2 changed files with 20 additions and 9 deletions
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4
contrib/llvm/lib/Analysis/InstructionSimplify.cpp
View file

@ -3697,7 +3697,7 @@ static Value *SimplifyGEPInst(Type *SrcTy, ArrayRef<Value *> Ops,
if (Ops.size() == 2) {
// getelementptr P, 0 -> P.
if (match(Ops[1], m_Zero()))
if (match(Ops[1], m_Zero()) && Ops[0]->getType() == GEPTy)
return Ops[0];
Type *Ty = SrcTy;
@ -3706,7 +3706,7 @@ static Value *SimplifyGEPInst(Type *SrcTy, ArrayRef<Value *> Ops,
uint64_t C;
uint64_t TyAllocSize = Q.DL.getTypeAllocSize(Ty);
// getelementptr P, N -> P if P points to a type of zero size.
if (TyAllocSize == 0)
if (TyAllocSize == 0 && Ops[0]->getType() == GEPTy)
return Ops[0];
// The following transforms are only safe if the ptrtoint cast

25
contrib/llvm/lib/IR/ConstantFold.cpp
View file

@ -2018,8 +2018,16 @@ static bool isInBoundsIndices(ArrayRef<IndexTy> Idxs) {
// If the first index is one and all the rest are zero, it's in bounds,
// by the one-past-the-end rule.
if (!cast<ConstantInt>(Idxs[0])->isOne())
return false;
if (auto *CI = dyn_cast<ConstantInt>(Idxs[0])) {
if (!CI->isOne())
return false;
} else {
auto *CV = cast<ConstantDataVector>(Idxs[0]);
CI = dyn_cast_or_null<ConstantInt>(CV->getSplatValue());
if (!CI || !CI->isOne())
return false;
}
for (unsigned i = 1, e = Idxs.size(); i != e; ++i)
if (!cast<Constant>(Idxs[i])->isNullValue())
return false;
@ -2049,15 +2057,18 @@ Constant *llvm::ConstantFoldGetElementPtr(Type *PointeeTy, Constant *C,
ArrayRef<Value *> Idxs) {
if (Idxs.empty()) return C;
if (isa<UndefValue>(C)) {
Type *GEPTy = GetElementPtrInst::getGEPReturnType(
C, makeArrayRef((Value * const *)Idxs.data(), Idxs.size()));
Type *GEPTy = GetElementPtrInst::getGEPReturnType(
C, makeArrayRef((Value *const *)Idxs.data(), Idxs.size()));
if (isa<UndefValue>(C))
return UndefValue::get(GEPTy);
}
Constant *Idx0 = cast<Constant>(Idxs[0]);
if (Idxs.size() == 1 && (Idx0->isNullValue() || isa<UndefValue>(Idx0)))
return C;
return GEPTy->isVectorTy() && !C->getType()->isVectorTy()
? ConstantVector::getSplat(
cast<VectorType>(GEPTy)->getNumElements(), C)
: C;
if (C->isNullValue()) {
bool isNull = true;