def test_fromfloat(self):
x = 1234567890.1234567890
f1 = rbigint.fromfloat(x)
y = f1.tofloat()
assert f1.tolong() == long(x)
# check overflow
#x = 12345.6789e10000000000000000000000000000
# XXX don't use such consts. marshal doesn't handle them right.
x = 12345.6789e200
x *= x
assert py.test.raises(OverflowError, rbigint.fromfloat, x)
assert py.test.raises(ValueError, rbigint.fromfloat, NAN)
#
f1 = rbigint.fromfloat(9007199254740991.0)
assert f1.tolong() == 9007199254740991
def get_stat_ns_as_bigint(st, name):
"""'name' is one of the strings "atime", "mtime" or "ctime".
Returns a bigint that represents the number of nanoseconds
stored inside the RPython-level os.stat_result 'st'.
Note that when running untranslated, the os.stat_result type
is from Python 2.7, which doesn't store more precision than
a float anyway. You will only get more after translation.
"""
from rpython.rlib.rbigint import rbigint
if not we_are_translated():
as_float = getattr(st, "st_" + name)
return rbigint.fromfloat(as_float * 1e9)
if name == "atime":
i, j = 7, -3
elif name == "mtime":
i, j = 8, -2
elif name == "ctime":
i, j = 9, -1
else:
raise AssertionError(name)
sec = st[i]
nsec = st[j]
result = rbigint.fromrarith_int(sec).int_mul(1000000000)
result = result.int_add(nsec)
return result
def get_stat_ns_as_bigint(st, name):
"""'name' is one of the strings "atime", "mtime" or "ctime".
Returns a bigint that represents the number of nanoseconds
stored inside the RPython-level os.stat_result 'st'.
Note that when running untranslated, the os.stat_result type
is from Python 2.7, which doesn't store more precision than
a float anyway. You will only get more after translation.
"""
from rpython.rlib.rbigint import rbigint
if not we_are_translated():
as_float = getattr(st, "st_" + name)
return rbigint.fromfloat(as_float * 1e9)
if name == "atime":
i, j = 7, -3
elif name == "mtime":
i, j = 8, -2
elif name == "ctime":
i, j = 9, -1
else:
raise AssertionError(name)
sec = st[i]
nsec = st[j]
result = rbigint.fromrarith_int(sec).int_mul(1000000000)
result = result.int_add(nsec)
return result
def test_tofloat_precision(self):
assert rbigint.fromlong(0).tofloat() == 0.0
for sign in [1, -1]:
for p in xrange(100):
x = long(2**p * (2**53 + 1) + 1) * sign
y = long(2**p * (2**53+ 2)) * sign
rx = rbigint.fromlong(x)
rxf = rx.tofloat()
assert rxf == float(y)
assert rbigint.fromfloat(rxf).tolong() == y
#
x = long(2**p * (2**53 + 1)) * sign
y = long(2**p * 2**53) * sign
rx = rbigint.fromlong(x)
rxf = rx.tofloat()
assert rxf == float(y)
assert rbigint.fromfloat(rxf).tolong() == y
def test_fromfloat(self):
x = 1234567890.1234567890
f1 = rbigint.fromfloat(x)
y = f1.tofloat()
assert f1.tolong() == long(x)
# check overflow
#x = 12345.6789e10000000000000000000000000000
# XXX don't use such consts. marshal doesn't handle them right.
x = 12345.6789e200
x *= x
assert py.test.raises(OverflowError, rbigint.fromfloat, x)
assert py.test.raises(ValueError, rbigint.fromfloat, NAN)
#
f1 = rbigint.fromfloat(9007199254740991.0)
assert f1.tolong() == 9007199254740991
null = rbigint.fromfloat(-0.0)
assert null.int_eq(0)
def do_compare_bigint(f1, b2):
"""f1 is a float. b2 is a bigint."""
if not isfinite(f1) or math.floor(f1) != f1:
return opname == 'ne'
b1 = rbigint.fromfloat(f1)
res = b1.eq(b2)
if opname == 'ne':
res = not res
return res
def arith_round(self):
fval = self.floatval
if fval >= 0:
factor = 1
else:
factor = -1
fval = fval * factor
try:
val = ovfcheck_float_to_int(math.floor(fval + 0.5) * factor)
except OverflowError:
return term.BigInt(rbigint.fromfloat(math.floor(self.floatval + 0.5) * factor))
return term.Number(val)
def do_compare_bigint(f1, b2):
"""f1 is a float. b2 is a bigint."""
if not isfinite(f1):
return op(f1, 0.0)
if opname == 'gt' or opname == 'le':
# 'float > long' <==> 'ceil(float) > long'
# 'float <= long' <==> 'ceil(float) <= long'
f1 = math.ceil(f1)
else:
# 'float < long' <==> 'floor(float) < long'
# 'float >= long' <==> 'floor(float) >= long'
f1 = math.floor(f1)
b1 = rbigint.fromfloat(f1)
return getattr(b1, opname)(b2)
def float_as_rbigint_ratio(value):
from rpython.rlib.rbigint import rbigint
if isinf(value):
raise OverflowError("cannot pass infinity to as_integer_ratio()")
elif isnan(value):
raise ValueError("cannot pass nan to as_integer_ratio()")
float_part, exp_int = math.frexp(value)
for i in range(300):
if float_part == math.floor(float_part):
break
float_part *= 2.0
exp_int -= 1
num = rbigint.fromfloat(float_part)
den = rbigint.fromint(1)
exp = den.lshift(abs(exp_int))
if exp_int > 0:
num = num.mul(exp)
else:
den = exp
return num, den
def float_as_rbigint_ratio(value):
from rpython.rlib.rbigint import rbigint
if isinf(value):
raise OverflowError("cannot pass infinity to as_integer_ratio()")
elif isnan(value):
raise ValueError("cannot pass nan to as_integer_ratio()")
float_part, exp_int = math.frexp(value)
for i in range(300):
if float_part == math.floor(float_part):
break
float_part *= 2.0
exp_int -= 1
num = rbigint.fromfloat(float_part)
den = rbigint.fromint(1)
exp = den.lshift(abs(exp_int))
if exp_int > 0:
num = num.mul(exp)
else:
den = exp
return num, den
def fromfloat(space, f):
return newlong(space, rbigint.fromfloat(f))
def floorDivideDouble(self, other):
# Of the two ways to lose precision, we had to choose one. ~ C.
return rbigint.fromfloat(self.bi.tofloat() / other)
def _arith_float_fractional_part(self):
try:
val = rarithmetic.ovfcheck_float_to_int(self.value)
except OverflowError:
val = rbigint.fromfloat(self.value).tofloat()
return float(self.value - val)
def fromfloat(value):
try:
val = rarithmetic.ovfcheck_float_to_int(value)
except OverflowError:
return W_Bignum(rbigint.fromfloat(value))
return W_Fixnum(val)
def arith_float_fractional_part(self):
try:
val = ovfcheck_float_to_int(self.floatval)
except OverflowError:
val = rbigint.fromfloat(self.floatval).tofloat()
return term.Float(float(self.floatval - val))
def arith_float_fractional_part(self):
try:
val = rarithmetic.ovfcheck_float_to_int(self.value)
except OverflowError:
val = rbigint.fromfloat(self.value).tofloat()
return values.W_Flonum(float(self.value - val))
def fromfloat(space, f):
return newlong(space, rbigint.fromfloat(f))
def arith_float_integer_part(self):
try:
val = ovfcheck_float_to_int(self.floatval)
except OverflowError:
return term.BigInt(rbigint.fromfloat(self.floatval))
return term.Number(val)
def fromfloat(value):
try:
val = rarithmetic.ovfcheck_float_to_int(value)
except OverflowError:
return W_Bignum(rbigint.fromfloat(value))
return W_Fixnum(val)
def arith_ceiling(self):
try:
val = ovfcheck_float_to_int(math.ceil(self.floatval))
except OverflowError:
return term.BigInt(rbigint.fromfloat(math.ceil(self.floatval)))
return term.Number(val)
def bigint_w(self, space):
return rbigint.fromfloat(self.floatvalue)
def bigint_w(self, space):
return rbigint.fromfloat(self.floatvalue)
def newbigint_fromfloat(space, floatvalue):
return W_BignumObject(space, rbigint.fromfloat(floatvalue))
def newbigint_fromfloat(space, floatvalue):
return W_BignumObject(space, rbigint.fromfloat(floatvalue))
def floorDivideDouble(self, other):
# Of the two ways to lose precision, we had to choose one. ~ C.
return rbigint.fromfloat(self.bi.tofloat() / other)
