gcc/testsuite/gcc.dg/torture/pr45720.c

   1 /* { dg-do run } */
   2 /* { dg-options "-ftree-vectorize" } */
   3
   4 float val[256];
   5 float x;
   6 void __attribute__((noinline,noclone))
   7 foo(int len, int beg)
   8 {
   9   int i;
  10   for (i = len - 1; i >= beg; --i)
  11     x += val[i] * 2;
  12 }
  13 void __attribute__((noinline,noclone))
  14 bar(void)
  15 {
  16   int i;
  17   for (i = 255; i >= 0; --i)
  18     x += val[i] * 2;
  19   for (i = 254; i >= 0; --i)
  20     x += val[i] * 2;
  21   for (i = 253; i >= 0; --i)
  22     x += val[i] * 2;
  23   for (i = 252; i >= 0; --i)
  24     x += val[i] * 2;
  25 }
  26 float y[256];
  27 void __attribute__((noinline,noclone))
  28 foobar(void)
  29 {
  30   int i;
  31   for (i = 0; i < 252; ++i)
  32     {
  33       float l = 0;
  34       l += val[255 - i] * 2;
  35       l += val[254 - i] * 2;
  36       l += val[253 - i] * 2;
  37       l += val[252 - i] * 2;
  38       y[i] = l;
  39     }
  40 }
  41 int main()
  42 {
  43   foo(256-1, 0);
  44   foo(256-2, 0);
  45   foo(256-3, 0);
  46   foo(256-4, 0);
  47   bar();
  48   foobar();
  49   return 0;
  50 }