http://gcc.gnu.org/bugzilla/show_bug.cgi?id=49942
Jakub Jelinek <jakub at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
CC| |jakub at gcc dot gnu.org
--- Comment #8 from Jakub Jelinek <jakub at gcc dot gnu.org> 2011-08-02
12:42:56 UTC ---
Can't reproduce on:
struct oper { char *digits; char sign; };
struct oper oper0 = {"900000000", '+'};
struct oper oper1 = {"400000000", '+'};
static int
comp (struct oper *op0, struct oper *op1)
{
int i;
__builtin_printf ("%s vs %s ", op0->digits, op1->digits);
for (i = 0; 9 > i; i++)
{
int diff = (0xff & op0->digits[i]) - (0xff & op1->digits[i]);
if (diff) return '-' == op0->sign ? (0 < diff ? -1 : 1) : (0 > diff ? -1
: 1);
}
return 0;
}
int
main ()
{
__builtin_printf (" is %d\n", comp (&oper0, &oper1));
__builtin_printf (" is %d\n", comp (&oper1, &oper0));
return 0;
}
With current 4.6 branch as well as trunk, compiling with with -m31 -O{0,1,2}
on x86_64-linux -> s390x-linux cross, then running on s390 always results in:
900000000 vs 400000000 is 1
400000000 vs 900000000 is -1
