From a3a64825006605c8428533670ec28c73f8e3498b Mon Sep 17 00:00:00 2001
From: law <law@138bc75d-0d04-0410-961f-82ee72b054a4>
Date: Wed, 30 Sep 1998 17:21:12 +0000
Subject:         * 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
---
 gcc/tm.texi | 8 ++++++++
 1 file changed, 8 insertions(+)

(limited to 'gcc/tm.texi')

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
-- 
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