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| author | Nikita Popov <npopov@redhat.com> | 2022-01-17 16:59:23 +0100 |
|---|---|---|
| committer | Nikita Popov <npopov@redhat.com> | 2022-01-17 17:01:47 +0100 |
| commit | f104cc38f45ebbca065e78959c23d09f16b65bd5 (patch) | |
| tree | 2ef69be5e3eb609e05cf377391d73d9ccdff4691 /llvm/lib/Analysis/ConstantFolding.cpp | |
| parent | 4cdf30d9d36ea6a6dfee967414f9f0e1748350af (diff) | |
| download | llvm-f104cc38f45ebbca065e78959c23d09f16b65bd5.zip llvm-f104cc38f45ebbca065e78959c23d09f16b65bd5.tar.gz llvm-f104cc38f45ebbca065e78959c23d09f16b65bd5.tar.bz2 | |
[ConstantFold] Don't fold load from non-byte-sized vector
Following up on https://github.com/llvm/llvm-project/commit/1470f94d71c544327f76b85c55cb6f7cb43a6cbb#r63981173:
The result here (probably) depends on endianness. Don't bother
trying to handle this exotic case, just bail out.
Diffstat (limited to 'llvm/lib/Analysis/ConstantFolding.cpp')
| -rw-r--r-- | llvm/lib/Analysis/ConstantFolding.cpp | 6 |
1 files changed, 6 insertions, 0 deletions
diff --git a/llvm/lib/Analysis/ConstantFolding.cpp b/llvm/lib/Analysis/ConstantFolding.cpp index b504d33..253a724 100644 --- a/llvm/lib/Analysis/ConstantFolding.cpp +++ b/llvm/lib/Analysis/ConstantFolding.cpp @@ -399,6 +399,12 @@ Constant *llvm::ConstantFoldLoadThroughBitcast(Constant *C, Type *DestTy, } while (ElemC && DL.getTypeSizeInBits(ElemC->getType()).isZero()); C = ElemC; } else { + // For non-byte-sized vector elements, the first element is not + // necessarily located at the vector base address. + if (auto *VT = dyn_cast<VectorType>(SrcTy)) + if (!DL.typeSizeEqualsStoreSize(VT->getElementType())) + return nullptr; + C = C->getAggregateElement(0u); } } while (C); |