gcc/testsuite/gcc.dg/charset/builtin1.c

   1 /* isdigit(c) can be optimized to ((unsigned)c) - '0' <= 9, but only if
   2    we know the correct value of '0'.  PR 18785.  */
   3
   4 /* { dg-do run } */
   5 /* { dg-require-iconv "IBM1047" } */
   6 /* { dg-options "-O2 -fno-inline -fexec-charset=IBM1047" } */
   7
   8 extern int isdigit(int);
   9 extern void abort(void);
  10
  11 static int str1(void) { return '1'; }
  12 static int strA(void) { return 'A'; }
  13
  14 int
  15 main(void)
  16 {
  17   if (!isdigit('1'))
  18     abort();
  19   if (isdigit('A'))
  20     abort();
  21   if (!isdigit(str1()))
  22     abort();
  23   if (isdigit(strA()))
  24     abort();
  25   return 0;
  26 }