gcc/testsuite/gcc.dg/tree-ssa/20040517-1.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O1 -fdump-tree-ssa-vops" } */
   3 int a;
   4
   5 extern void __attribute__ ((malloc)) *foo ();
   6
   7 void bar (void)
   8 {
   9   a = 1;
  10   foo ();
  11   if (a)
  12     abort ();
  13 }
  14
  15 /* We used to treat malloc functions like pure and const functions, but
  16    malloc functions may clobber global memory.  Only the function result
  17    does not alias any other pointer.
  18    Hence, we must have a VDEF for a before and after the call to foo().  */
  19 /* { dg-final { scan-tree-dump-times "V_MAY_DEF" 1 "ssa"} } */
  20