diff options
| author | Juergen Ributzka <juergen@apple.com> | 2014-01-30 02:39:00 +0000 |
|---|---|---|
| committer | Juergen Ributzka <juergen@apple.com> | 2014-01-30 02:39:00 +0000 |
| commit | 6bf3966f7fd92217360877d1c04ea8ffe47c11cc (patch) | |
| tree | d9435262cdcce73f7de6c89bc20aa5f72127aca2 /docs | |
| parent | ab42578bdd00f1738a1a9ff41481faf9673110ce (diff) | |
| download | llvm-6bf3966f7fd92217360877d1c04ea8ffe47c11cc.tar.gz llvm-6bf3966f7fd92217360877d1c04ea8ffe47c11cc.tar.bz2 llvm-6bf3966f7fd92217360877d1c04ea8ffe47c11cc.tar.xz | |
Extend the preserve_most/all calling convention description in LangRef about the
fact that the argument registers will be preserved too.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200441 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'docs')
| -rw-r--r-- | docs/LangRef.rst | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/docs/LangRef.rst b/docs/LangRef.rst index 8bb834b45e..d1eaee16a6 100644 --- a/docs/LangRef.rst +++ b/docs/LangRef.rst @@ -366,7 +366,9 @@ added in the future: calling convention on how arguments and return values are passed, but it uses a different set of caller/callee-saved registers. This alleviates the burden of saving and recovering a large register set before and after the - call in the caller. + call in the caller. If the arguments are passed in callee-saved registers, + then they will be preserved by the callee across the call. This doesn't + apply for values returned in callee-saved registers. - On X86-64 the callee preserves all general purpose registers, except for R11. R11 can be used as a scratch register. Floating-point registers @@ -397,7 +399,10 @@ added in the future: convention also 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. This removes the burden of saving and - recovering a large register set before and after the call in the caller. + recovering a large register set before and after the call in the caller. If + the arguments are passed in callee-saved registers, then they will be + preserved by the callee across the call. This doesn't apply for values + returned in callee-saved registers. - On X86-64 the callee preserves all general purpose registers, except for R11. R11 can be used as a scratch register. Furthermore it also preserves |