https://gcc.gnu.org/bugzilla/show_bug.cgi?id=107174
Andrew Pinski <pinskia at gcc dot gnu.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Resolution|--- |INVALID
Status|UNCONFIRMED |RESOLVED
--- Comment #1 from Andrew Pinski <pinskia at gcc dot gnu.org> ---
There is no bug here as signed integer overflow is undefined.
You should do the following if you want unsigned conversion.
__attribute__((noinline)) double deltaToDouble(int a, int b) {
unsigned ua = a;
unsigned ub = b;
if (a < b) {
unsigned int delta = ub - ua;
return -((double)delta);
} else {
unsigned int delta = ua - ub;
return (double)delta;
}
}
Otherwise GCC will assume (a - b) and (b - a) will never be overflow (as it is
undefined) and you will get the signed coversions.
