[PATCH] D58744: [CodeGen] Fix some broken IR generated by -fsanitize=unsigned-integer-overflow

[Erik Pilkington via Phabricator via cfe-commits]

erik.pilkington created this revision.
erik.pilkington added reviewers: rjmccall, arphaman, ahatanak.
Herald added subscribers: jdoerfert, jfb, dexonsmith, jkorous.
Herald added a project: clang.

I think the author of the function assumed that `GetInsertBlock()` wouldn't change from where `atomicPHI` was created, but this isn't true when `-fsanitize=unsigned-integer-overflow` is enabled (we generate an overflow/continuation label). Fix by keeping track of the block we want to return to to complete the cmpxchg loop.

rdar://48406558

Thanks!


Repository:
  rC Clang

https://reviews.llvm.org/D58744

Files:
  clang/lib/CodeGen/CGExprScalar.cpp
  clang/test/CodeGen/sanitize-atomic-int-overflow.c

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