gcc/testsuite/gcc.target/i386/pr57003.c

   1 /* PR rtl-optimization/57003 */
   2 /* { dg-do run } */
   3 /* { dg-options "-O2" } */
   4
   5 #define N 2001
   6 unsigned short *b, *c, *d;
   7
   8 __attribute__ ((noinline, noclone)) unsigned
   9 bar (void)
  10 {
  11   asm volatile ("" : : : "memory");
  12   return N;
  13 }
  14
  15 __attribute__ ((noinline, noclone)) unsigned short *
  16 baz (unsigned long x)
  17 {
  18   if (x != N * sizeof (unsigned short) + 20)
  19     __builtin_abort ();
  20   asm volatile ("" : : : "memory");
  21   return d;
  22 }
  23
  24 __attribute__ ((ms_abi, noinline, noclone)) void
  25 foo (void)
  26 {
  27   unsigned d;
  28   unsigned short *e;
  29   if ((d = bar ()))
  30     {
  31       e = baz (d * sizeof (unsigned short) + 20);
  32       __builtin_memcpy (e, b, d * sizeof (unsigned short));
  33       c = e;
  34     }
  35 }
  36
  37 int
  38 main ()
  39 {
  40   unsigned short a[2 * N];
  41   int i;
  42   for (i = 0; i < 2 * N; i++)
  43     a[i] = i + 1;
  44   b = a;
  45   d = a + N;
  46   asm volatile ("" : : : "memory");
  47   foo ();
  48   for (i = 0; i < N; i++)
  49     if (a[i] != i + 1 || a[i + N] != i + 1)
  50       __builtin_abort ();
  51   if (c != a + N)
  52     __builtin_abort ();
  53   return 0;
  54 }