gcc/testsuite/gcc.dg/wmul-1.c

   1 /* Not to fuse widening multiply with accumulate if the multiply has more than
   2    one uses.
   3    Note that for targets where pointer and int are of the same size or
   4    widening multiply-and-accumulate is not available, this test just passes.  */
   5
   6 /* { dg-do compile } */
   7 /* { dg-options "-O2 -fdump-tree-widening_mul" } */
   8
   9 typedef int ArrT [10][10];
  10
  11 void
  12 foo (ArrT Arr, int Idx)
  13 {
  14   Arr[Idx][Idx] = 1;
  15   Arr[Idx + 10][Idx] = 2;
  16 }
  17
  18 /* { dg-final { scan-tree-dump-not "WIDEN_MULT_PLUS_EXPR" "widening_mul" } } */