llvm-project

638bd11c - [msan] Handle SSE/AVX pshuf intrinsic by applying to shadow (#153895)

[msan] Handle SSE/AVX pshuf intrinsic by applying to shadow (#153895) llvm.x86.sse.pshuf.w(<1 x i64>, i8) and llvm.x86.avx512.pshuf.b.512(<64 x i8>, <64 x i8>) are currently handled strictly, which is suboptimal. llvm.x86.ssse3.pshuf.b(<1 x i64>, <1 x i64>) llvm.x86.ssse3.pshuf.b.128(<16 x i8>, <16 x i8>) and llvm.x86.avx2.pshuf.b(<32 x i8>, <32 x i8>) are currently heuristically handled using maybeHandleSimpleNomemIntrinsic, which is incorrect. Since the second argument is the shuffle order, we instrument all these intrinsics using `handleIntrinsicByApplyingToShadow(..., /*trailingVerbatimArgs=*/1)` (https://github.com/llvm/llvm-project/pull/114490).