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irutil.py
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irutil.py
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from llvmlite import ir
import struct
def _get_exponent(exp: str, frac: str):
is_less_than_one = int(exp) == 0
if is_less_than_one:
a = int(frac[0])
n = 1
b = 5 ** n
for _ in range(14):
out = 0
for __ in range(8):
out <<= 1
if a >= b:
return -n, str(a-b)
a *= 10
a += int(frac[n]) if n < len(frac) else 0
n += 1
b = 5 ** n
return -n, str(a)
else:
e = int(exp)
iexp = 63
n = 0
while iexp > 0:
if e & (1 << iexp):
e = e - (1 << iexp)
n = iexp
break
else:
iexp = iexp - 1
return n, str(e)
def _parse_significand(exp: str, frac: str, base_exp: int) -> list:
out_bytes = []
if base_exp >= 0:
a = int(frac[0])
elif 1-base_exp >= len(frac):
a = int(frac) * (10 ** max(-base_exp - len(frac), 0))
else:
a = int(frac[0:1-base_exp])
n = 1 if base_exp >= 0 else 1 - base_exp
b = 5 ** n
e = int(exp)
iexp = base_exp
# leftover = 7 - ((base_exp - 1) % 8)
for _ in range(14):
out = 0
for __ in range(8):
out <<= 1
if iexp > 0:
if e & (1 << iexp):
e = e - (1 << iexp)
# print(f'2^{iexp}=1')
iexp = iexp - 1
out |= 1
else:
# print(f'2^{iexp}=0')
iexp = iexp - 1
else:
if a >= b:
a = a - b
out |= 1
# print(f'2^-{n}=1')
else:
pass # print(f'2^-{n}=0')
a *= 10
a += int(frac[n]) if n < len(frac) else 0
n += 1
b = 5 ** n
out_bytes.append(out)
return out_bytes
def _format_float_as_hex(value, packfmt, unpackfmt):
x = value.split('.')
e, f = x[0], x[1] if len(x) > 1 else '0'
base_exp, rem = _get_exponent(e, f)
n = 0x3FFF + base_exp
if base_exp < 0:
f = rem
else:
e = rem
sbytes = _parse_significand(e, f, base_exp)
raw = struct.pack(packfmt, *reversed(sbytes[:]), n)
interp = struct.unpack(unpackfmt, raw)
quad1, quad2 = interp[0], interp[1]
out = f'0xL{quad1:016x}{quad2:016x}'
return out
def _format_quad(value):
"""
Format *value* as a hexadecimal string of its IEEE quad precision
representation.
"""
return _format_float_as_hex(value, 'B'*14 + 'H', '<QQ')
class FP128Type(ir.types.Type):
"""
The type for quad-precision floats.
"""
_instance_cache = 'fp128'
def __new__(cls):
return cls._instance_cache
def __eq__(self, other):
return isinstance(other, type(self))
def __hash__(self):
return hash(type(self))
@classmethod
def _create_instance(cls):
cls._instance_cache = super(FP128Type, cls).__new__(cls)
null = '0.0'
intrinsic_name = 'f128'
def __str__(self):
return 'fp128'
def format_constant(self, value):
return _format_quad(value)
FP128Type._create_instance()
class TokenType(ir.types.Type):
def _to_string(self):
return "token"
def __eq__(self, other):
return isinstance(other, TokenType)
def __hash__(self):
return hash(TokenType)