def float_bytes_to_real(bytes, signed):
# XXX Currently does not make use of the signed parameter
if len(bytes) not in (4, 8):
raise SchemeException(
"floating-point-bytes->real: byte string must have length 2, 4, or 8")
try:
if objectmodel.we_are_translated():
val = rarithmetic.r_int64(0)
for i, v in enumerate(bytes):
val += rarithmetic.r_int64(ord(v)) << (i * 8)
return values.W_Flonum(longlong2float.longlong2float(val))
else:
# use unsigned to avoid rlib bug
val = rarithmetic.r_uint64(0)
for i, v in enumerate(bytes):
val += rarithmetic.r_uint64(ord(v)) << (i * 8)
return values.W_Flonum(pycket_longlong2float(val))
except OverflowError, e:
# Uncomment the check below to run Pycket on the
# interpreter with compiled (zo) files
# (fasl makes a call that blows the longlong2float on rpython)
# if val == 18442240474082181120L:
# return values.W_Flonum.NEGINF
raise SchemeException("RPython overflow : %s" % e)
def float_bytes_to_real(bytes, signed):
# XXX Currently does not make use of the signed parameter
if len(bytes) not in (4, 8):
raise SchemeException(
"floating-point-bytes->real: byte string must have length 2, 4, or 8")
try:
if objectmodel.we_are_translated():
val = rarithmetic.r_int64(0)
for i, v in enumerate(bytes):
val += rarithmetic.r_int64(ord(v)) << (i * 8)
return values.W_Flonum(longlong2float.longlong2float(val))
else:
# use unsigned to avoid rlib bug
val = rarithmetic.r_uint64(0)
for i, v in enumerate(bytes):
val += rarithmetic.r_uint64(ord(v)) << (i * 8)
return values.W_Flonum(pycket_longlong2float(val))
except OverflowError, e:
# Uncomment the check below to run Pycket on the
# interpreter with compiled (zo) files
# (fasl makes a call that blows the longlong2float on rpython)
# if val == 18442240474082181120L:
# return values.W_Flonum.NEGINF
raise SchemeException("RPython overflow : %s" % e)
def _unbox(self, w_value):
space = self.space
assert type(w_value) is self.typ
if type(w_value) is space.IntObjectCls:
return longlong2float(space.int_w(w_value))
else:
return space.float_w(w_value)
def unpack_longlong2float(fmtiter):
from rpython.rlib.rstruct.runpack import runpack
from rpython.rlib.longlong2float import longlong2float
s = fmtiter.read(8)
llval = runpack('q', s) # this is a bit recursive, I know
doubleval = longlong2float(llval)
fmtiter.appendobj(doubleval)
def test_int_or_float_special_nan(self):
from rpython.rlib import longlong2float, rarithmetic
space = self.space
ll = rarithmetic.r_longlong(0xfffffffe12345678 - 2**64)
specialnan = longlong2float.longlong2float(ll)
w_l = W_ListObject(space, [space.wrap(1), space.wrap(specialnan)])
assert isinstance(w_l.strategy, ObjectListStrategy)
def unpack_longlong2float(fmtiter):
from rpython.rlib.rstruct.runpack import runpack
from rpython.rlib.longlong2float import longlong2float
s = fmtiter.read(8)
llval = runpack('q', s) # this is a bit recursive, I know
doubleval = longlong2float(llval)
fmtiter.appendobj(doubleval)
def float_unpack(Q, size):
"""Convert a 16-bit, 32-bit, or 64-bit integer created
by float_pack into a Python float."""
if size == 8:
MIN_EXP = -1021 # = sys.float_info.min_exp
MAX_EXP = 1024 # = sys.float_info.max_exp
MANT_DIG = 53 # = sys.float_info.mant_dig
BITS = 64
elif size == 4:
MIN_EXP = -125 # C's FLT_MIN_EXP
MAX_EXP = 128 # FLT_MAX_EXP
MANT_DIG = 24 # FLT_MANT_DIG
BITS = 32
elif size == 2:
MIN_EXP = -13
MAX_EXP = 16
MANT_DIG = 11
BITS = 16
else:
raise ValueError("invalid size value")
if not objectmodel.we_are_translated():
# This tests generates wrong code when translated:
# with gcc, shifting a 64bit int by 64 bits does
# not change the value.
if Q >> BITS:
raise ValueError("input '%r' out of range '%r'" % (Q, Q >> BITS))
# extract pieces with assumed 1.mant values
one = r_ulonglong(1)
sign = rarithmetic.intmask(Q >> BITS - 1)
exp = rarithmetic.intmask((Q & ((one << BITS - 1) -
(one << MANT_DIG - 1))) >> MANT_DIG - 1)
mant = Q & ((one << MANT_DIG - 1) - 1)
if exp == MAX_EXP - MIN_EXP + 2:
# nan or infinity
if mant == 0:
result = rfloat.INFINITY
else:
# preserve at most 52 bits of mant value, but pad w/zeros
exp = r_ulonglong(0x7ff) << 52
sign = r_ulonglong(sign) << 63
if MANT_DIG < 53:
mant = r_ulonglong(mant) << (53 - MANT_DIG)
if mant == 0:
result = rfloat.NAN
else:
uint = exp | mant | sign
result = longlong2float(cast(LONGLONG, uint))
return result
elif exp == 0:
# subnormal or zero
result = math.ldexp(mant, MIN_EXP - MANT_DIG)
else:
# normal: add implicit one value
mant += one << MANT_DIG - 1
result = math.ldexp(mant, exp + MIN_EXP - MANT_DIG - 1)
return -result if sign else result
def read_location(self, obj):
# assert isinstance(obj, Object)
if self.is_set(obj):
double_val = longlong2float(
getattr(obj, "_primField" + str(field_idx)))
return Double(double_val)
else:
return nilObject
def test_consistency_longlong2float_ll2ctypes(llval):
# these definitions are used only in tests, when not translated
#return struct.unpack('@d', struct.pack('@q', llval))[0]
with lltype.scoped_alloc(DOUBLE_ARRAY_PTR.TO, 1) as d_array:
ll_array = rffi.cast(LONGLONG_ARRAY_PTR, d_array)
ll_array[0] = llval
floatval = d_array[0]
assert repr(floatval) == repr(longlong2float(llval))
def read_location(self, obj):
# assert isinstance(obj, Object)
if self.is_set(obj):
double_val = longlong2float(
getattr(obj, "_primField" + str(field_idx)))
return Double(double_val)
else:
return nilObject
def float_unpack(Q, size):
"""Convert a 16-bit, 32-bit, or 64-bit integer created
by float_pack into a Python float."""
if size == 8:
MIN_EXP = -1021 # = sys.float_info.min_exp
MAX_EXP = 1024 # = sys.float_info.max_exp
MANT_DIG = 53 # = sys.float_info.mant_dig
BITS = 64
elif size == 4:
MIN_EXP = -125 # C's FLT_MIN_EXP
MAX_EXP = 128 # FLT_MAX_EXP
MANT_DIG = 24 # FLT_MANT_DIG
BITS = 32
elif size == 2:
MIN_EXP = -13
MAX_EXP = 16
MANT_DIG = 11
BITS = 16
else:
raise ValueError("invalid size value")
if not objectmodel.we_are_translated():
# This tests generates wrong code when translated:
# with gcc, shifting a 64bit int by 64 bits does
# not change the value.
if Q >> BITS:
raise ValueError("input '%r' out of range '%r'" % (Q, Q >> BITS))
# extract pieces with assumed 1.mant values
one = r_ulonglong(1)
sign = rarithmetic.intmask(Q >> BITS - 1)
exp = rarithmetic.intmask((Q & ((one << BITS - 1) - (one << MANT_DIG - 1))) >> MANT_DIG - 1)
mant = Q & ((one << MANT_DIG - 1) - 1)
if exp == MAX_EXP - MIN_EXP + 2:
# nan or infinity
if mant == 0:
result = rfloat.INFINITY
else:
# preserve at most 52 bits of mant value, but pad w/zeros
exp = r_ulonglong(0x7FF) << 52
sign = r_ulonglong(sign) << 63
if MANT_DIG < 53:
mant = r_ulonglong(mant) << (53 - MANT_DIG)
if mant == 0:
result = rfloat.NAN
else:
uint = exp | mant | sign
result = longlong2float(cast(LONGLONG, uint))
return result
elif exp == 0:
# subnormal or zero
result = math.ldexp(mant, MIN_EXP - MANT_DIG)
else:
# normal: add implicit one value
mant += one << MANT_DIG - 1
result = math.ldexp(mant, exp + MIN_EXP - MANT_DIG - 1)
return -result if sign else result
def integer_bytes_to_integer(bstr, signed):
# XXX Currently does not make use of the signed parameter
bytes = bstr.value
if len(bytes) not in (4, 8):
raise SchemeException("floating-point-bytes->real: byte string must have length 2, 4, or 8")
val = 0
for i, v in enumerate(bytes):
val += ord(v) << (i * 8)
return values.W_Flonum(longlong2float.longlong2float(val))
def integer_bytes_to_integer(bstr, signed):
# XXX Currently does not make use of the signed parameter
bytes = bstr.value
if len(bytes) not in (4, 8):
raise SchemeException(
"floating-point-bytes->real: byte string must have length 2, 4, or 8")
val = 0
for i, v in enumerate(bytes):
val += ord(v) << (i * 8)
return values.W_Flonum(longlong2float.longlong2float(val))
def test_int_or_float_from_float_special_nan(self):
from rpython.rlib import longlong2float, rarithmetic
space = self.space
w = space.wrap
ll = rarithmetic.r_longlong(0xfffffffe12345678 - 2**64)
specialnan = longlong2float.longlong2float(ll)
w_l = W_ListObject(space, [space.wrap(specialnan)])
assert isinstance(w_l.strategy, FloatListStrategy)
w_l.append(w(42))
assert isinstance(w_l.strategy, ObjectListStrategy)
assert space.int_w(w_l.getitem(1)) == 42
assert space.len_w(w_l) == 2
def fn_encode_nan(f1, i2):
from rpython.rlib.longlong2float import can_encode_float, can_encode_int32
from rpython.rlib.longlong2float import encode_int32_into_longlong_nan
from rpython.rlib.longlong2float import decode_int32_from_longlong_nan
from rpython.rlib.longlong2float import is_int32_from_longlong_nan
assert can_encode_float(f1)
assert can_encode_int32(i2)
l1 = float2longlong(f1)
l2 = encode_int32_into_longlong_nan(i2)
assert not is_int32_from_longlong_nan(l1)
assert is_int32_from_longlong_nan(l2)
f1b = longlong2float(l1)
assert f1b == f1 or (math.isnan(f1b) and math.isnan(f1))
assert decode_int32_from_longlong_nan(l2) == i2
return 42
def fn_encode_nan(f1, i2):
from rpython.rlib.longlong2float import can_encode_float, can_encode_int32
from rpython.rlib.longlong2float import encode_int32_into_longlong_nan
from rpython.rlib.longlong2float import decode_int32_from_longlong_nan
from rpython.rlib.longlong2float import is_int32_from_longlong_nan
from rpython.rlib.rfloat import isnan
assert can_encode_float(f1)
assert can_encode_int32(i2)
l1 = float2longlong(f1)
l2 = encode_int32_into_longlong_nan(i2)
assert not is_int32_from_longlong_nan(l1)
assert is_int32_from_longlong_nan(l2)
f1b = longlong2float(l1)
assert f1b == f1 or (isnan(f1b) and isnan(f1))
assert decode_int32_from_longlong_nan(l2) == i2
return 42
def byteswap(arg):
""" Convert little->big endian and the opposite
"""
from rpython.rtyper.lltypesystem import lltype, rffi
from rpython.rlib.longlong2float import longlong2float, float2longlong,\
uint2singlefloat, singlefloat2uint
T = lltype.typeOf(arg)
if T == lltype.SingleFloat:
arg = singlefloat2uint(arg)
elif T == lltype.Float:
arg = float2longlong(arg)
elif T == lltype.LongFloat:
assert False
else:
# we cannot do arithmetics on small ints
arg = widen(arg)
if rffi.sizeof(T) == 1:
res = arg
elif rffi.sizeof(T) == 2:
a, b = arg & 0xFF, arg & 0xFF00
res = (a << 8) | (b >> 8)
elif rffi.sizeof(T) == 4:
FF = r_uint(0xFF)
arg = r_uint(arg)
a, b, c, d = (arg & FF, arg & (FF << 8), arg & (FF << 16),
arg & (FF << 24))
res = (a << 24) | (b << 8) | (c >> 8) | (d >> 24)
elif rffi.sizeof(T) == 8:
FF = r_ulonglong(0xFF)
arg = r_ulonglong(arg)
a, b, c, d = (arg & FF, arg & (FF << 8), arg & (FF << 16),
arg & (FF << 24))
e, f, g, h = (arg & (FF << 32), arg & (FF << 40), arg & (FF << 48),
arg & (FF << 56))
res = ((a << 56) | (b << 40) | (c << 24) | (d << 8) | (e >> 8) |
(f >> 24) | (g >> 40) | (h >> 56))
else:
assert False # unreachable code
if T == lltype.SingleFloat:
return uint2singlefloat(rffi.cast(rffi.UINT, res))
if T == lltype.Float:
return longlong2float(rffi.cast(rffi.LONGLONG, res))
return rffi.cast(T, res)
def float_unpack80(QQ, size):
'''Unpack a (mant, exp) tuple of r_ulonglong in 80-bit extended format
into a python float (a double)
'''
if size == 10 or size == 12 or size == 16:
MIN_EXP = -16381
MAX_EXP = 16384
MANT_DIG = 64
TOP_BITS = 80 - 64
else:
raise ValueError("invalid size value")
if len(QQ) != 2:
raise ValueError("QQ must be two 64 bit uints")
if not objectmodel.we_are_translated():
# This tests generates wrong code when translated:
# with gcc, shifting a 64bit int by 64 bits does
# not change the value.
if QQ[1] >> TOP_BITS:
raise ValueError("input '%r' out of range '%r'" %
(QQ, QQ[1] >> TOP_BITS))
# extract pieces with explicit one in MANT_DIG
one = r_ulonglong(1)
sign = rarithmetic.intmask(QQ[1] >> TOP_BITS - 1)
exp = rarithmetic.intmask((QQ[1] & ((one << TOP_BITS - 1) - 1)))
mant = QQ[0]
if exp == MAX_EXP - MIN_EXP + 2:
# nan or infinity
if mant == 0:
result = rfloat.INFINITY
else:
exp = r_ulonglong(0x7ff) << 52
mant = r_ulonglong(mant) >> size + 1
if mant == 0:
result = rfloat.NAN
else:
uint = exp | r_ulonglong(mant) | r_ulonglong(sign)
result = longlong2float(cast(LONGLONG, uint))
return result
else:
# normal
result = math.ldexp(mant, exp + MIN_EXP - MANT_DIG - 1)
return -result if sign else result
def byteswap(arg):
""" Convert little->big endian and the opposite
"""
from rpython.rtyper.lltypesystem import lltype, rffi
from rpython.rlib.longlong2float import longlong2float, float2longlong,\
uint2singlefloat, singlefloat2uint
T = lltype.typeOf(arg)
if T == lltype.SingleFloat:
arg = singlefloat2uint(arg)
elif T == lltype.Float:
arg = float2longlong(arg)
elif T == lltype.LongFloat:
assert False
else:
# we cannot do arithmetics on small ints
arg = widen(arg)
if rffi.sizeof(T) == 1:
res = arg
elif rffi.sizeof(T) == 2:
a, b = arg & 0xFF, arg & 0xFF00
res = (a << 8) | (b >> 8)
elif rffi.sizeof(T) == 4:
FF = r_uint(0xFF)
arg = r_uint(arg)
a, b, c, d = (arg & FF, arg & (FF << 8), arg & (FF << 16),
arg & (FF << 24))
res = (a << 24) | (b << 8) | (c >> 8) | (d >> 24)
elif rffi.sizeof(T) == 8:
FF = r_ulonglong(0xFF)
arg = r_ulonglong(arg)
a, b, c, d = (arg & FF, arg & (FF << 8), arg & (FF << 16),
arg & (FF << 24))
e, f, g, h = (arg & (FF << 32), arg & (FF << 40), arg & (FF << 48),
arg & (FF << 56))
res = ((a << 56) | (b << 40) | (c << 24) | (d << 8) | (e >> 8) |
(f >> 24) | (g >> 40) | (h >> 56))
else:
assert False # unreachable code
if T == lltype.SingleFloat:
return uint2singlefloat(rffi.cast(rffi.UINT, res))
if T == lltype.Float:
return longlong2float(rffi.cast(rffi.LONGLONG, res))
return rffi.cast(T, res)
def float_unpack80(QQ, size):
"""Unpack a (mant, exp) tuple of r_ulonglong in 80-bit extended format
into a python float (a double)
"""
if size == 10 or size == 12 or size == 16:
MIN_EXP = -16381
MAX_EXP = 16384
MANT_DIG = 64
TOP_BITS = 80 - 64
else:
raise ValueError("invalid size value")
if len(QQ) != 2:
raise ValueError("QQ must be two 64 bit uints")
if not objectmodel.we_are_translated():
# This tests generates wrong code when translated:
# with gcc, shifting a 64bit int by 64 bits does
# not change the value.
if QQ[1] >> TOP_BITS:
raise ValueError("input '%r' out of range '%r'" % (QQ, QQ[1] >> TOP_BITS))
# extract pieces with explicit one in MANT_DIG
one = r_ulonglong(1)
sign = rarithmetic.intmask(QQ[1] >> TOP_BITS - 1)
exp = rarithmetic.intmask((QQ[1] & ((one << TOP_BITS - 1) - 1)))
mant = QQ[0]
if exp == MAX_EXP - MIN_EXP + 2:
# nan or infinity
if mant == 0:
result = rfloat.INFINITY
else:
exp = r_ulonglong(0x7FF) << 52
mant = r_ulonglong(mant) >> size + 1
if mant == 0:
result = rfloat.NAN
else:
uint = exp | r_ulonglong(mant) | r_ulonglong(sign)
result = longlong2float(cast(LONGLONG, uint))
return result
else:
# normal
result = math.ldexp(mant, exp + MIN_EXP - MANT_DIG - 1)
return -result if sign else result
def _store(self, space, w_obj, w_value):
w_obj.unboxed_storage[self.pos] = longlong2float.longlong2float(
rffi.cast(lltype.SignedLongLong, space.int_w(w_value)))
def unwrap(self, w_val):
if isinstance(w_val, W_Fixnum):
bits = encode_int32_into_longlong_nan(w_val.value)
return longlong2float(bits)
assert isinstance(w_val, W_Flonum)
return w_val.value
def fn(f1):
ll = float2longlong(f1)
f2 = longlong2float(ll)
return f2
def f(f1):
try:
ll = float2longlong(f1)
return longlong2float(ll)
except Exception:
return 500
def f(f1):
try:
ll = float2longlong(f1)
return longlong2float(ll)
except Exception:
return 500
def read_location(self, obj):
if self.is_set(obj):
val = longlong2float(obj._primFields[self._ext_idx])
return Double(val)
else:
return nilObject
def unwrap(self, w_val):
if isinstance(w_val, W_Fixnum):
bits = encode_int32_into_longlong_nan(w_val.value)
return longlong2float(bits)
assert isinstance(w_val, W_Flonum)
return w_val.value
def fn(f1):
ll = float2longlong(f1)
f2 = longlong2float(ll)
return f2
def op_convert_longlong_bytes_to_float(a):
from rpython.rlib.longlong2float import longlong2float
return longlong2float(a)
def f(x):
ll = float2longlong(x)
return longlong2float(ll)
def op_convert_longlong_bytes_to_float(a):
from rpython.rlib.longlong2float import longlong2float
return longlong2float(a)
def read_location(self, obj):
if self.is_set(obj):
val = longlong2float(obj._primFields[self._ext_idx])
return Double(val)
else:
return nilObject
def _store(self, space, w_obj, w_value):
w_obj.unboxed_storage[self.pos] = longlong2float.longlong2float(
rffi.cast(lltype.SignedLongLong, space.int_w(w_value)))
def f(x):
ll = float2longlong(x)
return longlong2float(ll)
