[libcxx-commits] [clang] [libcxx] [clang] [libc++] fix _Atomic c11 compare exchange does not update expected results (PR #78707)

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huixie90 wrote:

@efriedma-quic I found another problem. The way it works for non-power-of-two types is that, it creates temporary with power of two sizes and copy the original value into the memory then do the CAS. The problem is that the temporary was not zeroed. so the CAS and spuriously fail if the last unused bytes in the temporary has some different value. I have fixed this as well.  see line 1436

https://github.com/llvm/llvm-project/pull/78707