[PATCH] D127812: [AArch64] FMV support and necessary target features dependencies.

[Pavel Iliin via Phabricator via cfe-commits]

ilinpv added a comment.

I've managed to reproduce "MemorySanitizer: use-of-uninitialized-value" error locally, thank you @hctim for help!
If I understand it right, it seems **MSan didn't handle correctly SmallVector** - a variable-sized array with some number of elements in-place and heap allocation for additional elements if needed:

  clang/lib/Sema/SemaDeclAttr.cpp:3615 SmallVector<SmallString<64>, 2> StringsBuffer;

There were 2 elements in-placed for StringsBuffer and tests which require 3 failed with MSan use-of-uninitialized-value error. 
With number of StringsBuffer in-placed elements set to 3

  SmallVector<SmallString<64>, 3> StringsBuffer;

all use-of-uninitialized-value errors have gone.


Repository:
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https://reviews.llvm.org/D127812