flow.c (calculate_global_regs_live): Force stack pointer live at end.

        * flow.c (calculate_global_regs_live): Force stack pointer
        live at end.

From-SVN: r33476

gcc/ChangeLog

@@ -3,6 +3,9 @@
 	* flow.c (allocate_reg_life_data): Set max_regno here ...
 	(life_analysis): ... not here.
 
+	* flow.c (calculate_global_regs_live): Force stack pointer
+	live at end.
+
 2000-04-26  Richard Henderson  <rth@cygnus.com>
 
 	* jump.c (redirect_exp_1): Rework from old redirect_exp.  Never

gcc/flow.c

@@ -3050,6 +3050,10 @@ calculate_global_regs_live (blocks_in, blocks_out, flags)
 	  IOR_REG_SET (new_live_at_end, sb->global_live_at_start);
 	}
 
+      /* Force the stack pointer to be live -- which might not already be 
+	 the case for blocks within infinite loops.  */
+      SET_REGNO_REG_SET (new_live_at_end, STACK_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