re PR rtl-optimization/12372 (miscompilation of execute/20030307-1.c at -O2 and -Os)

	PR optimization/12372
	* calls.c (expand_call): Add call_fusage data for stack arguments in
	constant calls.

From-SVN: r75926

gcc/ChangeLog

+2004-01-15  John David Anglin  <dave.anglin@nrc-cnrc.gc.ca>
+
+	PR optimization/12372
+	* calls.c (expand_call): Add call_fusage data for stack arguments in
+	constant calls.
+
 2004-01-15  Alan Modra  <amodra@bigpond.net.au>
 
 	* config/rs6000/rs6000.c (uses_TOC): Correct comment.  Make static.

gcc/calls.c

@@ -3025,6 +3025,14 @@ expand_call (tree exp, rtx target, int ignore)
 		    && check_sibcall_argument_overlap (before_arg,
 						       &args[i], 1)))
 	      sibcall_failure = 1;
+
+	    if (flags & ECF_CONST
+		&& args[i].stack
+		&& args[i].value == args[i].stack)
+	      call_fusage = gen_rtx_EXPR_LIST (VOIDmode,
+					       gen_rtx_USE (VOIDmode,
+							    args[i].value),
+					       call_fusage);
 	  }
 
       /* If we have a parm that is passed in registers but not in memory