gcc/testsuite/gcc.dg/i386-signbit-1.c

   1 /* PR optimization/8746 */
   2 /* { dg-do run { target i?86-*-* } } */
   3 /* { dg-options "-O1 -mtune=i586" } */
   4
   5 extern void abort (void);
   6
   7 unsigned char r0;
   8
   9 int foo(int x)
  10 {
  11   unsigned char r = x&0xf0;
  12
  13   if (!(r&0x80))
  14   {
  15     r0 = r;
  16     return 0;
  17   }
  18   else
  19     return 1;
  20 }
  21
  22 int main(void)
  23 {
  24   if (foo(0x80) != 1)
  25     abort();
  26
  27    return 0;
  28 }