diff options
| author | vries <vries@138bc75d-0d04-0410-961f-82ee72b054a4> | 2014-05-28 09:43:41 +0000 |
|---|---|---|
| committer | vries <vries@138bc75d-0d04-0410-961f-82ee72b054a4> | 2014-05-28 09:43:41 +0000 |
| commit | c72a450a93b2267ed467dccba674ffbf5cf422aa (patch) | |
| tree | d5af881420733d41b0a68193ad583b1fefbd1855 /gcc/doc | |
| parent | ec0d1d643fa3b5a0a4bb6cdc6e5bad494b84cb7e (diff) | |
| download | gcc-c72a450a93b2267ed467dccba674ffbf5cf422aa.tar.gz | |
-fuse-caller-save - Add documentation
2014-05-28 Radovan Obradovic <robradovic@mips.com>
Tom de Vries <tom@codesourcery.com>
* doc/invoke.texi (@item Optimization Options): Add -fuse-caller-save to
gccoptlist.
(@item -fuse-caller-save): New item.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@211009 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/doc')
| -rw-r--r-- | gcc/doc/invoke.texi | 12 |
1 files changed, 10 insertions, 2 deletions
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi index fcdcb1d04b4..7f137793698 100644 --- a/gcc/doc/invoke.texi +++ b/gcc/doc/invoke.texi @@ -429,8 +429,8 @@ Objective-C and Objective-C++ Dialects}. -ftree-vectorize -ftree-vrp @gol -funit-at-a-time -funroll-all-loops -funroll-loops @gol -funsafe-loop-optimizations -funsafe-math-optimizations -funswitch-loops @gol --fvariable-expansion-in-unroller -fvect-cost-model -fvpt -fweb @gol --fwhole-program -fwpa -fuse-ld=@var{linker} -fuse-linker-plugin @gol +-fuse-caller-save -fvariable-expansion-in-unroller -fvect-cost-model -fvpt @gol +-fweb -fwhole-program -fwpa -fuse-ld=@var{linker} -fuse-linker-plugin @gol --param @var{name}=@var{value} -O -O0 -O1 -O2 -O3 -Os -Ofast -Og} @@ -7741,6 +7741,14 @@ and then tries to find ways to combine them. Enabled by default at @option{-O1} and higher. +@item -fuse-caller-save +Use caller save registers for allocation if those registers are not used by +any called function. In that case it is not necessary to save and restore +them around calls. This is only possible if called functions are part of +same compilation unit as current function and they are compiled before it. + +Enabled at levels @option{-O2}, @option{-O3}, @option{-Os}. + @item -fconserve-stack @opindex fconserve-stack Attempt to minimize stack usage. The compiler attempts to use less |