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Diffstat (limited to 'docs/LangRef.rst')
| -rw-r--r-- | docs/LangRef.rst | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/docs/LangRef.rst b/docs/LangRef.rst index 24a73150da..ec34a31cd4 100644 --- a/docs/LangRef.rst +++ b/docs/LangRef.rst @@ -1080,6 +1080,11 @@ volatile operations. The optimizers *may* change the order of volatile operations relative to non-volatile operations. This is not Java's "volatile" and has no cross-thread synchronization behavior. +IR-level volatile loads and stores cannot safely be optimized into +llvm.memcpy or llvm.memmove intrinsics even when those intrinsics are +flagged volatile. Likewise, the backend should never split or merge +target-legal volatile load/store instructions. + .. _memmodel: Memory Model for Concurrent Operations |