gcc/testsuite/g++.dg/vect/pr87914.cc

   1 // { dg-do run }
   2 // { dg-additional-options "-fopenmp-simd" }
   3 // { dg-additional-options "-mavx2" { target { avx2_runtime } } }
   4
   5 extern "C" int memcmp(const void *s1, const void *s2, __SIZE_TYPE__ n);
   6 extern "C" void abort(void);
   7
   8 template <typename T>
   9 T reverseBits(T x)
  10 {
  11   unsigned int s = sizeof(x) * 8;
  12   T mask = ~T(0);
  13   while ((s >>= 1) > 0)
  14     {
  15       mask ^= (mask << s);
  16       x = ((x >> s) & mask) | ((x << s) & ~mask); // unsupported use in stmt
  17     }
  18   return x;
  19 }
  20
  21 void __attribute__((noinline,noipa))
  22 test_reverseBits(unsigned* x)
  23 {
  24 #pragma omp simd aligned(x:32)
  25   for (int i = 0; i < 16; ++i)
  26     x[i] = reverseBits(x[i]); // couldn't vectorize loop
  27 }
  28
  29 int main()
  30 {
  31   unsigned arr[16] __attribute__((aligned(32)))
  32     = { 0x01020304, 0x05060708, 0x0a0b0c0d, 0x0e0f1011,
  33         0x11121314, 0x45065708, 0xfa0b3c0du, 0x0e0f1211,
  34         0x21222324, 0x55066708, 0xfa0b2c0du, 0x1e0f1011,
  35         0x31323334, 0x65067708, 0xfa0b5c0du, 0x0e3f1011 };
  36   unsigned arr2[16]
  37     = { 0x20c04080, 0x10e060a0, 0xb030d050, 0x8808f070u,
  38         0x28c84888, 0x10ea60a2, 0xb03cd05f, 0x8848f070u,
  39         0x24c44484, 0x10e660aa, 0xb034d05f, 0x8808f078u,
  40         0x2ccc4c8c, 0x10ee60a6, 0xb03ad05f, 0x8808fc70u };
  41
  42   test_reverseBits (arr);
  43
  44   if (memcmp (arr, arr2, sizeof (arr)) != 0)
  45     abort ();
  46   return 0;
  47 }
  48
  49 // { dg-final { scan-tree-dump "OUTER LOOP VECTORIZED" "vect" { target { vect_var_shift && vect_int } } } }