regrename.c (copy_value): Don't replace fixed or global regs with older regs.

	* regrename.c (copy_value): Don't replace fixed or global
	regs with older regs.

From-SVN: r101330

gcc/ChangeLog

 2005-06-26  Jakub Jelinek  <jakub@redhat.com>
 
+	* regrename.c (copy_value): Don't replace fixed or global
+	regs with older regs.
+
 	* defaults.h (FRAME_GROWS_DOWNWARD): Define to 0 if not defined.
 	* function.c (get_func_frame_size): Use if (FRAME_GROWS_DOWNWARD)
 	instead of preprocessor conditionals.

gcc/regrename.c

@@ -1225,6 +1225,10 @@ copy_value (rtx dest, rtx src, struct value_data *vd)
   if (frame_pointer_needed && dr == HARD_FRAME_POINTER_REGNUM)
     return;
 
+  /* Likewise for fixed or global registers.  */
+  if (fixed_regs[dr] || global_regs[dr])
+    return;
+
   /* If SRC and DEST overlap, don't record anything.  */
   dn = hard_regno_nregs[dr][GET_MODE (dest)];
   sn = hard_regno_nregs[sr][GET_MODE (dest)];