tm.texi (Caller Saves): Say that DEFAULT_CALLER_SAVES has no effect when -O2 and higher.

        * tm.texi (Caller Saves): Say that DEFAULT_CALLER_SAVES has no
        effect when -O2 and higher.
        * invoke.texi (Optimize Options): Likewise for -fcaller-saves.

From-SVN: r21848

gcc/ChangeLog

+Wed Aug 19 13:51:35 1998  Hans-Peter Nilsson  <hp@axis.se>
+
+	* tm.texi (Caller Saves): Say that DEFAULT_CALLER_SAVES has no
+	effect when -O2 and higher.
+	* invoke.texi (Optimize Options): Likewise for -fcaller-saves.
+
 1998-08-19  Michael Hayes  <michaelh@ongaonga.chch.cri.nz>
 
 	* regclass.c: Changed register set documentation to be consistent

gcc/invoke.texi

@@ -2397,8 +2397,11 @@ function calls, by emitting extra instructions to save and restore the
 registers around such calls.  Such allocation is done only when it
 seems to result in better code than would otherwise be produced.
 
-This option is enabled by default on certain machines, usually those
-which have no call-preserved registers to use instead.
+This option is always enabled by default on certain machines, usually
+those which have no call-preserved registers to use instead.
+
+For all machines, optimization level 2 and higher enables this flag by
+default.
 
 @item -funroll-loops
 Perform the optimization of loop unrolling.  This is only done for loops

gcc/tm.texi

@@ -3150,9 +3150,9 @@ must live across calls.
 @item DEFAULT_CALLER_SAVES
 Define this macro if function calls on the target machine do not preserve
 any registers; in other words, if @code{CALL_USED_REGISTERS} has 1
-for all registers.  This macro enables @samp{-fcaller-saves} by default.
-Eventually that option will be enabled by default on all machines and both
-the option and this macro will be eliminated.
+for all registers.  When defined, this macro enables @samp{-fcaller-saves} 
+by default for all optimization levels.  It has no effect for optimization
+levels 2 and higher, where @samp{-fcaller-saves} is the default.
 
 @findex CALLER_SAVE_PROFITABLE
 @item CALLER_SAVE_PROFITABLE (@var{refs}, @var{calls})