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Diffstat (limited to 'llvm/docs/LangRef.rst')
| -rw-r--r-- | llvm/docs/LangRef.rst | 10 |
1 files changed, 10 insertions, 0 deletions
diff --git a/llvm/docs/LangRef.rst b/llvm/docs/LangRef.rst index cf1ceab1f1c..82b33557c12 100644 --- a/llvm/docs/LangRef.rst +++ b/llvm/docs/LangRef.rst @@ -406,6 +406,16 @@ added in the future: This calling convention, like the `PreserveMost` calling convention, will be used by a future version of the ObjectiveC runtime and should be considered experimental at this time. +"``cxx_fast_tlscc``" - The `CXX_FAST_TLS` calling convention for access functions + This calling convention aims to minimize overhead in the caller by + preserving as many registers as possible. This calling convention behaves + identical to the `C` calling convention on how arguments and return values + are passed, but it uses a different set of caller/callee-saved registers. + Given that C-style TLS on Darwin has its own special CSRs, we can't use the + existing `PreserveMost`. + + - On X86-64 the callee preserves all general purpose registers, except for + RDI and RAX. "``cc <n>``" - Numbered convention Any calling convention may be specified by number, allowing target-specific calling conventions to be used. Target specific |
