gcc/testsuite/gcc.dg/builtin-assume-aligned-1.c

   1 /* { dg-do compile } */
   2 /* { dg-options "-O3 -fdump-tree-optimized" } */
   3
   4 void
   5 test1 (double *out1, double *out2, double *out3, double *in1,
   6        double *in2, int len)
   7 {
   8   int i;
   9   double *__restrict o1 = __builtin_assume_aligned (out1, 16);
  10   double *__restrict o2 = __builtin_assume_aligned (out2, 16);
  11   double *__restrict o3 = __builtin_assume_aligned (out3, 16);
  12   double *__restrict i1 = __builtin_assume_aligned (in1, 16);
  13   double *__restrict i2 = __builtin_assume_aligned (in2, 16);
  14   for (i = 0; i < len; ++i)
  15     {
  16       o1[i] = i1[i] * i2[i];
  17       o2[i] = i1[i] + i2[i];
  18       o3[i] = i1[i] - i2[i];
  19     }
  20 }
  21
  22 void
  23 test2 (double *out1, double *out2, double *out3, double *in1,
  24        double *in2, int len)
  25 {
  26   int i, align = 32, misalign = 16;
  27   out1 = __builtin_assume_aligned (out1, align, misalign);
  28   out2 = __builtin_assume_aligned (out2, align, 16);
  29   out3 = __builtin_assume_aligned (out3, 32, misalign);
  30   in1 = __builtin_assume_aligned (in1, 32, 16);
  31   in2 = __builtin_assume_aligned (in2, 32, 0);
  32   for (i = 0; i < len; ++i)
  33     {
  34       out1[i] = in1[i] * in2[i];
  35       out2[i] = in1[i] + in2[i];
  36       out3[i] = in1[i] - in2[i];
  37     }
  38 }
  39
  40 /* { dg-final { scan-tree-dump-not "__builtin_assume_aligned" "optimized" } } */