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[TTI] getUserCost - Ensure a vector insert/extract index is in unsigned 32-bit range 

Otherwise fallback to the generic 'unknown index' path

Fixes https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=29050
This commit is contained in:
Simon Pilgrim 2021-09-25 10:50:54 +01:00
parent ed687c0211
commit 993f3c61b3
2 changed files with 22 additions and 10 deletions
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20
llvm/include/llvm/Analysis/TargetTransformInfoImpl.h
View File

@ -1068,8 +1068,10 @@ public:
auto *IE = dyn_cast<InsertElementInst>(U);
if (!IE)
return TTI::TCC_Basic; // FIXME
auto *CI = dyn_cast<ConstantInt>(IE->getOperand(2));
unsigned Idx = CI ? CI->getZExtValue() : -1;
unsigned Idx = -1;
if (auto *CI = dyn_cast<ConstantInt>(IE->getOperand(2)))
if (CI->getValue().getActiveBits() <= 32)
Idx = CI->getZExtValue();
return TargetTTI->getVectorInstrCost(Opcode, Ty, Idx);
}
case Instruction::ShuffleVector: {
@ -1132,17 +1134,15 @@ public:
Shuffle->getShuffleMask(), 0, nullptr);
}
case Instruction::ExtractElement: {
unsigned Idx = -1;
auto *EEI = dyn_cast<ExtractElementInst>(U);
if (!EEI)
return TTI::TCC_Basic; // FIXME
auto *CI = dyn_cast<ConstantInt>(EEI->getOperand(1));
if (CI)
Idx = CI->getZExtValue();
return TargetTTI->getVectorInstrCost(Opcode, U->getOperand(0)->getType(),
Idx);
unsigned Idx = -1;
if (auto *CI = dyn_cast<ConstantInt>(EEI->getOperand(1)))
if (CI->getValue().getActiveBits() <= 32)
Idx = CI->getZExtValue();
Type *DstTy = U->getOperand(0)->getType();
return TargetTTI->getVectorInstrCost(Opcode, DstTy, Idx);
}
}
// By default, just classify everything as 'basic'.

12
llvm/test/Transforms/LICM/crash.ll
View File

@ -73,3 +73,15 @@ define void @test4() noreturn nounwind {
store i32 undef, i32* @g_47, align 4
br label %1
}
; OSS-Fuzz #29050
; https://bugs.chromium.org/p/oss-fuzz/issues/detail?id=29050
define <2 x i177> @ossfuzz_29050(<2 x i177> %X) {
bb:
br label %BB
BB:
%I3 = insertelement <2 x i177> undef, i177 95780971304118053647396689196894323976171195136475135, i177 95780971304118053647396689196894323976171195136475135
br i1 true, label %BB, label %BB1
BB1:
ret <2 x i177> %I3
}