gcc/testsuite/gcc.dg/20020517-1.c

   1 /* This testcase caused ICE in do_SUBST on IA-32, because 0xf6 constant
   2    was not sign-extended for QImode.  */
   3 /* { dg-do run } */
   4 /* { dg-options "-O2" } */
   5 /* { dg-options "-O2 -mtune=i686" { target { { i?86-*-* x86_64-*-* } && ia32 } } } */
   6
   7 #include <limits.h>
   8
   9 void abort (void);
  10 void exit (int);
  11
  12 void foo (void)
  13 {
  14   int i;
  15   char *p;
  16
  17   p = (char *) &i;
  18   *p = -10;
  19   if (* (unsigned char *) p != 0x100 - 10)
  20     abort ();
  21 }
  22
  23 int main (void)
  24 {
  25   if (UCHAR_MAX == 255)
  26     foo ();
  27   exit (0);
  28 }