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Diffstat (limited to 'llvm/docs/LangRef.rst')
| -rw-r--r-- | llvm/docs/LangRef.rst | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/llvm/docs/LangRef.rst b/llvm/docs/LangRef.rst index 8cbed7d87d1..b097230591f 100644 --- a/llvm/docs/LangRef.rst +++ b/llvm/docs/LangRef.rst @@ -14267,6 +14267,36 @@ not overflow at link time under the medium code model if ``x`` is an a constant initializer folded into a function body. This intrinsic can be used to avoid the possibility of overflows when loading from such a constant. +'``llvm.sideeffect``' Intrinsic +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +Syntax: +""""""" + +:: + + declare void @llvm.sideeffect() inaccessiblememonly nounwind + +Overview: +""""""""" + +The ``llvm.sideeffect`` intrinsic doesn't perform any operation. Optimizers +treat it as having side effects, so it can be inserted into a loop to +indicate that the loop shouldn't be assumed to terminate (which could +potentially lead to the loop being optimized away entirely), even if it's +an infinite loop with no other side effects. + +Arguments: +"""""""""" + +None. + +Semantics: +"""""""""" + +This intrinsic actually does nothing, but optimizers must assume that it +has externally observable side effects. + Stack Map Intrinsics -------------------- |
