Example #1
0
JSBool /* ES5 15.8.2.15. */
js_math_round(JSContext *cx, unsigned argc, Value *vp)
{
    CallArgs args = CallArgsFromVp(argc, vp);

    if (args.length() == 0) {
        args.rval().setDouble(js_NaN);
        return true;
    }

    double x;
    if (!ToNumber(cx, args[0], &x))
        return false;

    int32_t i;
    if (DoubleIsInt32(x, &i)) {
        args.rval().setInt32(i);
        return true;
    }

    /* Some numbers are so big that adding 0.5 would give the wrong number. */
    if (ExponentComponent(x) >= 52) {
        args.rval().setNumber(x);
        return true;
    }

    args.rval().setNumber(js_copysign(floor(x + 0.5), x));
    return true;
}
Example #2
0
double
js::math_round_impl(double x)
{
    int32_t i;
    if (DoubleIsInt32(x, &i))
        return double(i);

    /* Some numbers are so big that adding 0.5 would give the wrong number. */
    if (ExponentComponent(x) >= 52)
        return x;

    return js_copysign(floor(x + 0.5), x);
}
Example #3
0
static void
TestPredicates()
{
  MOZ_ASSERT(IsNaN(UnspecifiedNaN()));
  MOZ_ASSERT(IsNaN(SpecificNaN(1, 17)));;
  MOZ_ASSERT(IsNaN(SpecificNaN(0, 0xfffffffffff0fULL)));
  MOZ_ASSERT(!IsNaN(0));
  MOZ_ASSERT(!IsNaN(-0.0));
  MOZ_ASSERT(!IsNaN(1.0));
  MOZ_ASSERT(!IsNaN(PositiveInfinity()));
  MOZ_ASSERT(!IsNaN(NegativeInfinity()));

  MOZ_ASSERT(IsInfinite(PositiveInfinity()));
  MOZ_ASSERT(IsInfinite(NegativeInfinity()));
  MOZ_ASSERT(!IsInfinite(UnspecifiedNaN()));
  MOZ_ASSERT(!IsInfinite(0));
  MOZ_ASSERT(!IsInfinite(-0.0));
  MOZ_ASSERT(!IsInfinite(1.0));

  MOZ_ASSERT(!IsFinite(PositiveInfinity()));
  MOZ_ASSERT(!IsFinite(NegativeInfinity()));
  MOZ_ASSERT(!IsFinite(UnspecifiedNaN()));
  MOZ_ASSERT(IsFinite(0));
  MOZ_ASSERT(IsFinite(-0.0));
  MOZ_ASSERT(IsFinite(1.0));

  MOZ_ASSERT(!IsNegative(PositiveInfinity()));
  MOZ_ASSERT(IsNegative(NegativeInfinity()));
  MOZ_ASSERT(IsNegative(-0.0));
  MOZ_ASSERT(!IsNegative(0.0));
  MOZ_ASSERT(IsNegative(-1.0));
  MOZ_ASSERT(!IsNegative(1.0));

  MOZ_ASSERT(!IsNegativeZero(PositiveInfinity()));
  MOZ_ASSERT(!IsNegativeZero(NegativeInfinity()));
  MOZ_ASSERT(!IsNegativeZero(SpecificNaN(1, 17)));;
  MOZ_ASSERT(!IsNegativeZero(SpecificNaN(1, 0xfffffffffff0fULL)));
  MOZ_ASSERT(!IsNegativeZero(SpecificNaN(0, 17)));;
  MOZ_ASSERT(!IsNegativeZero(SpecificNaN(0, 0xfffffffffff0fULL)));
  MOZ_ASSERT(!IsNegativeZero(UnspecifiedNaN()));
  MOZ_ASSERT(IsNegativeZero(-0.0));
  MOZ_ASSERT(!IsNegativeZero(0.0));
  MOZ_ASSERT(!IsNegativeZero(-1.0));
  MOZ_ASSERT(!IsNegativeZero(1.0));

  int32_t i;
  MOZ_ASSERT(DoubleIsInt32(0.0, &i)); MOZ_ASSERT(i == 0);
  MOZ_ASSERT(!DoubleIsInt32(-0.0, &i));
  MOZ_ASSERT(DoubleEqualsInt32(0.0, &i)); MOZ_ASSERT(i == 0);
  MOZ_ASSERT(DoubleEqualsInt32(-0.0, &i)); MOZ_ASSERT(i == 0);
  MOZ_ASSERT(DoubleIsInt32(INT32_MIN, &i)); MOZ_ASSERT(i == INT32_MIN);
  MOZ_ASSERT(DoubleIsInt32(INT32_MAX, &i)); MOZ_ASSERT(i == INT32_MAX);
  MOZ_ASSERT(DoubleEqualsInt32(INT32_MIN, &i)); MOZ_ASSERT(i == INT32_MIN);
  MOZ_ASSERT(DoubleEqualsInt32(INT32_MAX, &i)); MOZ_ASSERT(i == INT32_MAX);
  MOZ_ASSERT(!DoubleIsInt32(0.5, &i));
  MOZ_ASSERT(!DoubleIsInt32(double(INT32_MAX) + 0.1, &i));
  MOZ_ASSERT(!DoubleIsInt32(double(INT32_MIN) - 0.1, &i));
  MOZ_ASSERT(!DoubleIsInt32(NegativeInfinity(), &i));
  MOZ_ASSERT(!DoubleIsInt32(PositiveInfinity(), &i));
  MOZ_ASSERT(!DoubleIsInt32(UnspecifiedNaN(), &i));
  MOZ_ASSERT(!DoubleEqualsInt32(0.5, &i));
  MOZ_ASSERT(!DoubleEqualsInt32(double(INT32_MAX) + 0.1, &i));
  MOZ_ASSERT(!DoubleEqualsInt32(double(INT32_MIN) - 0.1, &i));
  MOZ_ASSERT(!DoubleEqualsInt32(NegativeInfinity(), &i));
  MOZ_ASSERT(!DoubleEqualsInt32(PositiveInfinity(), &i));
  MOZ_ASSERT(!DoubleEqualsInt32(UnspecifiedNaN(), &i));
}