flow.c (calculate_global_regs_live): Mark frame pointer live everywhere before reload.

        * flow.c (calculate_global_regs_live): Mark frame pointer live
        everywhere before reload.

From-SVN: r35862

gcc/ChangeLog

+2000-08-21  Richard Henderson  <rth@cygnus.com>
+
+	* flow.c (calculate_global_regs_live): Mark frame pointer live
+	everywhere before reload.
+
 2000-08-21  Jim Wilson  <wilson@cygnus.com>
 
 	* real.c (ereal_from_int, ereal_from_uint, significand_size): Handle

gcc/flow.c

@@ -3191,6 +3191,12 @@ calculate_global_regs_live (blocks_in, blocks_out, flags)
 	 the case for blocks within infinite loops.  */
       SET_REGNO_REG_SET (new_live_at_end, STACK_POINTER_REGNUM);
 
+      /* Similarly for the frame pointer before reload.  Any reference
+	 to any pseudo before reload is a potential reference of the
+	 frame pointer.  */
+      if (! reload_completed)
+	SET_REGNO_REG_SET (new_live_at_end, FRAME_POINTER_REGNUM);
+
       /* Regs used in phi nodes are not included in
 	 global_live_at_start, since they are live only along a
 	 particular edge.  Set those regs that are live because of a