rs6000.c (first_reg_to_save): Don't save fixed or call-used registers…

rs6000.c (first_reg_to_save): Don't save fixed or call-used registers (call-saved registers must still be...

* config/rs6000/rs6000.c (first_reg_to_save): Don't save fixed or
call-used registers (call-saved registers must still be contiguous
and end with r31, of course).

Co-Authored-By: Geoff Keating <geoffk@cygnus.com>
Co-Authored-By: Melissa O'Neill <oneill@cs.sfu.ca>

From-SVN: r29181

gcc/ChangeLog

+Wed Sep  8 14:34:42 1999  Ian Piumarta  <piumarta@prof.inria.fr>
+			  Melissa O'Neill  <oneill@cs.sfu.ca>
+			  Geoffrey Keating  <geoffk@cygnus.com>
+
+	* config/rs6000/rs6000.c (first_reg_to_save): Don't save fixed or
+ 	call-used registers (call-saved registers must still be contiguous
+ 	and end with r31, of course).
+
 Tue Sep  7 21:41:38 1999  Richard Henderson  <rth@cygnus.com>
 
 	* c-typeck.c (type_lists_compatible_p): Use simple_type_promotes_to.

gcc/config/rs6000/rs6000.c

@@ -3414,7 +3414,7 @@ first_reg_to_save ()
 
   /* Find lowest numbered live register.  */
   for (first_reg = 13; first_reg <= 31; first_reg++)
-    if (regs_ever_live[first_reg])
+    if (regs_ever_live[first_reg] && ! call_used_regs[first_reg])
       break;
 
   if (profile_flag)