diff options
Diffstat (limited to 'clang/lib/CodeGen/CGCall.cpp')
| -rw-r--r-- | clang/lib/CodeGen/CGCall.cpp | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/clang/lib/CodeGen/CGCall.cpp b/clang/lib/CodeGen/CGCall.cpp index 6cc0154..98365db 100644 --- a/clang/lib/CodeGen/CGCall.cpp +++ b/clang/lib/CodeGen/CGCall.cpp @@ -3892,6 +3892,10 @@ public: const auto *AlignmentCI = dyn_cast<llvm::ConstantInt>(Alignment); if (!AlignmentCI) return Attrs; + // We may legitimately have non-power-of-2 alignment here. + // If so, this is UB land, emit it via `@llvm.assume` instead. + if (!AlignmentCI->getValue().isPowerOf2()) + return Attrs; llvm::AttributeList NewAttrs = maybeRaiseRetAlignmentAttribute( CGF.getLLVMContext(), Attrs, llvm::Align( |