[tree-ssa] new testcase: copyprop on structs

[Dan Nicolaescu]

1 test showing that copyprop does not work on structs.
This is probably a known issue, but it would be good to have some
tests in the testsuite.

It wasn't clear which optimization should have taken care of 
this so the scan is done on the final .optimized dump.

If approved, please check it in, I don't have commit access.

2003-11-06  Dan Nicolaescu  <dann@ics.uci.edu>

	* gcc.dg/tree-ssa/20031106-6.c: New test.

*** /dev/null	Thu Apr 11 07:25:15 2002
--- gcc/testsuite/gcc.dg/tree-ssa/20031106-6.c	Thu Nov  6 10:50:49 2003
***************
*** 0 ****
--- 1,28 ----
+ /* { dg-do compile } */ 
+ /* { dg-options "-O1 -fdump-tree-optimized" } */
+ 
+ extern void link_error (void);
+ 
+ /* Check for copyprop on structs.  */
+ 
+ struct s
+ {
+   char d;
+   int a, b;
+   double m;
+ };
+ 
+ struct s foo (struct s r)
+ {
+   struct s temp_struct1;
+   struct s temp_struct2;
+   struct s temp_struct3;
+   temp_struct1 = r;
+   temp_struct2 = temp_struct1;
+   temp_struct3 = temp_struct2;
+   return temp_struct3;
+ }
+ 
+ /* There should be no references to any of "temp_struct*"
+    temporaries.  */
+ /* { dg-final { scan-tree-dump-times "temp_struct" 0 "optimized"} } */