gcc/testsuite/gcc.dg/tree-ssa/tail-merge-1.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2 -fdump-tree-dce4" } */
   3
   4 void foo1 (int *restrict a, int *restrict b, int *restrict c,
   5            int *restrict d, int *restrict res, int n)
   6 {
   7   for (int i = 0; i < n; i++)
   8     res[i] = a[i] ? b[i] : (c[i] ? b[i] : d[i]);
   9 }
  10
  11 /* After tail-merging (run during PRE) we should end up merging the two
  12    blocks dereferencing 'b', ending up with two iftmp assigns and the
  13    iftmp PHI def.  */
  14 /* { dg-final { scan-tree-dump-times "iftmp\[^\r\n\]* = " 3 "dce4" } } */