gcc/testsuite/gcc.dg/tree-ssa/ssa-pre-19.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O2 -fdump-tree-pre-stats" } */
   3
   4 struct Loc {
   5     int x[3];
   6 };
   7
   8 void bar (struct Loc *);
   9
  10 int foo (int i, int j, int k, int b)
  11 {
  12   struct Loc IND;
  13   int res;
  14
  15   if (b)
  16     {
  17       IND.x[0] = i;
  18       IND.x[1] = j;
  19       IND.x[2] = k-1;
  20     }
  21   else
  22     {
  23       IND.x[0] = i;
  24       IND.x[1] = j;
  25       IND.x[2] = k;
  26     }
  27
  28   /* This should be optimized to i + j + {k, k + 1}.  */
  29   res = IND.x[0] + IND.x[1] + IND.x[2];
  30
  31   /* This is just to prevent SRA.  */
  32   bar (&IND);
  33
  34   return res;
  35 }
  36
  37 /* All three loads should be eliminated.  */
  38 /* { dg-final { scan-tree-dump "Eliminated: 3" "pre" } } */
  39 /* { dg-final { cleanup-tree-dump "pre" } } */