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| author | law <law@138bc75d-0d04-0410-961f-82ee72b054a4> | 1998-09-30 17:21:12 +0000 |
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| committer | law <law@138bc75d-0d04-0410-961f-82ee72b054a4> | 1998-09-30 17:21:12 +0000 |
| commit | a3a64825006605c8428533670ec28c73f8e3498b (patch) | |
| tree | 93f07283cba47ba79d733a55522f62a33876cd47 /gcc/tm.texi | |
| parent | 2e6e4a81d9020053e22e490c330d2b372ac5e91d (diff) | |
| download | gcc-a3a64825006605c8428533670ec28c73f8e3498b.tar.gz | |
* regs.h (HARD_REGNO_CALLER_SAVE_MODE): New macro.
* caller-save.c (init_caller_save): Use it.
* tm.texi: Document HARD_REGNO_CALLER_SAVE_MODE.
git-svn-id: svn+ssh://gcc.gnu.org/svn/gcc/trunk@22682 138bc75d-0d04-0410-961f-82ee72b054a4
Diffstat (limited to 'gcc/tm.texi')
| -rw-r--r-- | gcc/tm.texi | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/gcc/tm.texi b/gcc/tm.texi index ea3e8b3110a..a42eb67a619 100644 --- a/gcc/tm.texi +++ b/gcc/tm.texi @@ -3174,6 +3174,14 @@ this is worth doing, and 0 otherwise. If you don't define this macro, a default is used which is good on most machines: @code{4 * @var{calls} < @var{refs}}. + +@findex HARD_REGNO_CALLER_SAVE_MODE +@item HARD_REGNO_CALLER_SAVE_MODE (@var{regno}, @var{nregs}) +A C expression specifying which mode is required for saving @var{nregs} +of a pseudo-register in call-clobbered hard register @var{regno}. If +@var{regno} is unsuitable for caller save, @code{VOIDmode} should be +returned. For most machines this macro need not be defined since GCC +will select the smallest suitable mode. @end table @node Function Entry |