This is the mail archive of the
gcc-patches@gcc.gnu.org
mailing list for the GCC project.
[PATCH][09/10] -fuse-caller-save - Add documentation
- From: Tom de Vries <tom at codesourcery dot com>
- To: Vladimir Makarov <vmakarov at redhat dot com>
- Cc: gcc-patches <gcc-patches at gcc dot gnu dot org>
- Date: Sat, 30 Mar 2013 10:12:05 -0700
- Subject: [PATCH][09/10] -fuse-caller-save - Add documentation
Vladimir,
This patch adds the documentation of -fuse-caller-save.
Thanks,
-Tom
2013-03-30 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.
diff --git a/gcc/doc/invoke.texi b/gcc/doc/invoke.texi
index 475dcf0..efb8a1a 100644
--- a/gcc/doc/invoke.texi
+++ b/gcc/doc/invoke.texi
@@ -421,8 +421,8 @@ Objective-C and Objective-C++ Dialects}.
-ftree-ter -ftree-vect-loop-version -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}
@@ -7382,6 +7382,14 @@ 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