function.c (keep_stack_depressed): Refine check for register clobbered over call.

	* function.c (keep_stack_depressed): Refine check for register
	clobbered over call.

From-SVN: r47664

gcc/ChangeLog

 Wed Dec  5 06:26:27 2001  Richard Kenner  <kenner@vlsi1.ultra.nyu.edu>
 
+	* function.c (keep_stack_depressed): Refine check for register
+	clobbered over call.
+
 	* expr.c (store_expr): When copying string constant into array,
 	use functions that update memrefs instead of computations on
 	addresses to better track MEMs.  Also properly handle 32/64 pointers.

gcc/function.c

@@ -7274,7 +7274,8 @@ keep_stack_depressed (seq)
 
 	      for (regno = 0; regno < FIRST_PSEUDO_REGISTER; regno++)
 		if (HARD_REGNO_MODE_OK (regno, Pmode)
-		    && !fixed_regs[regno] && call_used_regs[regno]
+		    && !fixed_regs[regno]
+		    && TEST_HARD_REG_BIT (regs_invalidated_by_call, regno)
 		    && !FUNCTION_VALUE_REGNO_P (regno))
 		  break;