[PATCH] D74453: [LegalizeTypes][RISCV] Correctly sign-extend comparison for ATOMIC_CMP_XCHG

[Alexander Richardson via Phabricator via llvm-commits]

arichardson added a comment.

As this is such a simple change and fixes a nasty code generation bug, should this be backported to the release branch?

For our CHERI version of FreeBSD, I changed the atomic.h header to use __atomic_foo instead of hand-written assembly and this causes freezes on startup without this change.
I am considering upstreaming this change to FreeBSD, so it would be nice if clang 10 had a working `__atomic_compare_exchange` for uint32_t.
If this is backported, I could just guard it with `#if __clang_major__ < 10`.


Repository:
  rG LLVM Github Monorepo

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https://reviews.llvm.org/D74453