rtlanal.c: (rtx_unstable_p): HARD_FRAME_POINTER_REGNUM is not an unstable register.

* rtlanal.c: (rtx_unstable_p): HARD_FRAME_POINTER_REGNUM is not
an unstable register.
(rtx_varies_p, case REG): hard_frame_pointer_rtx is invariant.
(rtx_addr_can_trap_p, case REG): hard_frame_pointer_rtx won't trap.

From-SVN: r5465

gcc/rtlanal.c

@@ -54,6 +54,7 @@ rtx_unstable_p (x)
 
   if (code == REG)
     return ! (REGNO (x) == FRAME_POINTER_REGNUM
+	      || REGNO (x) == HARD_FRAME_POINTER_REGNUM
 	      || REGNO (x) == ARG_POINTER_REGNUM
 	      || RTX_UNCHANGING_P (x));
 
@@ -96,7 +97,8 @@ rtx_varies_p (x)
 	 and arg pointers and not just the register number in case we have
 	 eliminated the frame and/or arg pointer and are using it
 	 for pseudos.  */
-      return ! (x == frame_pointer_rtx || x == arg_pointer_rtx);
+      return ! (x == frame_pointer_rtx || x == hard_frame_pointer_rtx
+		|| x == arg_pointer_rtx);
 
     case LO_SUM:
       /* The operand 0 of a LO_SUM is considered constant
@@ -132,8 +134,8 @@ rtx_addr_can_trap_p (x)
 
     case REG:
       /* As in rtx_varies_p, we have to use the actual rtx, not reg number.  */
-      return ! (x == frame_pointer_rtx || x == stack_pointer_rtx
-		|| x == arg_pointer_rtx);
+      return ! (x == frame_pointer_rtx || x == hard_frame_pointer_rtx
+		|| x == stack_pointer_rtx || x == arg_pointer_rtx);
 
     case CONST:
       return rtx_addr_can_trap_p (XEXP (x, 0));