[cfe-commits] Patch for review/integration: __sync_swap()

[Dave Zarzycki]

Background:

The __sync_*() atomic intrinsics do not directly expose the fundamental atomic swap operation that many processors support. One can indirectly get at the instruction by using __sync_lock_test_and_set(), but the documentation for that intrinsic does not promise to be an atomic swap on all architectures or even be a full barrier like the other __sync_*() intrinsics. This patch fixes this oversight:

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This is my first clang patch, so please be understanding if I made any newbie mistakes.

Thanks for considering this change,

davez