reload.c (find_equiv_reg): If need_stable_sp is set, check if stack pointer is changed directly.

	* reload.c (find_equiv_reg): If need_stable_sp is set,
	check if stack pointer is changed directly.

From-SVN: r20984

gcc/ChangeLog

@@ -76,6 +76,9 @@ Mon Jul  6 22:50:48 1998  Jason Merrill  <jason@yorick.cygnus.com>
 
 Mon Jul  6 22:47:55 1998  J"orn Rennecke <amylaar@cygnus.co.uk>
 
+	* reload.c (find_equiv_reg): If need_stable_sp is set,
+	check if stack pointer is changed directly.
+
 	* reload1.c (delete_dead_insn): Don't delete feeding insn
 	if that insn has side effects.
 

gcc/reload.c

@@ -6220,6 +6220,8 @@ find_equiv_reg (goal, insn, class, other, reload_reg_p, goalreg, mode)
 		  if (goal_mem_addr_varies
 		      && reg_overlap_mentioned_for_reload_p (dest, goal))
 		    return 0;
+		  if (xregno == STACK_POINTER_REGNUM && need_stable_sp)
+		    return 0;
 		}
 	      else if (goal_mem && GET_CODE (dest) == MEM
 		       && ! push_operand (dest, GET_MODE (dest)))