gcc/testsuite/gcc.dg/pr23911.c

   1 /* This was a missed optimization in tree constant propagation
   2    that CSE would catch later on.  */
   3 /* { dg-do compile } */
   4 /* { dg-options "-O -fdump-tree-dce2" } */
   5
   6 double _Complex *a;
   7 static const double _Complex b[10] = {0, 1, 2, 3, 4, 5, 6, 7, 8, 9};
   8
   9 void
  10 test (void)
  11 {
  12   a[0] = b[0] + b[1];
  13   a[1] = b[0] + b[1];
  14   return;
  15 }
  16
  17 /* After DCE2 which runs after FRE, the expressions should be fully
  18    constant folded.  There should be no loads from b left.  */
  19 /* { dg-final { scan-tree-dump-times "__complex__ \\\(1.0e\\\+0, 0.0\\\)" 2 "dce2" } } */
  20 /* { dg-final { scan-tree-dump-times "= b" 0 "dce2" } } */
  21 /* { dg-final { cleanup-tree-dump "dce2" } } */