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Diffstat (limited to 'docs')
| -rw-r--r-- | docs/LangRef.rst | 30 |
1 files changed, 30 insertions, 0 deletions
diff --git a/docs/LangRef.rst b/docs/LangRef.rst index c959f56ef1..d18d4ebac9 100644 --- a/docs/LangRef.rst +++ b/docs/LangRef.rst @@ -6939,6 +6939,36 @@ is lowered to a constant 0. Note that runtime support may be conditional on the privilege-level code is running at and the host platform. +'``llvm.clear_cache``' Intrinsic +^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^ + +Syntax: +""""""" + +:: + + declare void @llvm.clear_cache(i8*, i8*) + +Overview: +""""""""" + +The '``llvm.clear_cache``' intrinsic provides access to the systemcall +that flushes the cache at the range specified. Some targets need this +to specifically flush the instruction cache when executable data changes +in memory (self-modifying code). Other targets have unified intruction +and data cache, so they don't need any calls. + +Semantics: +"""""""""" + +When directly supported, this intrinsic will either return a call to +the appropriate cache clearing system call (usually ``__clear_cache``) +when the caches are not unified (ARM, Mips) or just remove the call +altogether when they are (ex. x86_64). + +Targets must implement it directly to have either behaviour, as the +default is to bail with "Not Implemented" message. + Standard C Library Intrinsics ----------------------------- |