ref: 8e97c355d09f2bb8fe71956369272ce513cef0d1
dir: /libstd/floatbits.myr/
pkg std =
const float64bits : (flt : float64 -> int64)
const float32bits : (flt : float32 -> int32)
const float64frombits : (bits : uint64 -> float64)
const float32frombits : (bits : uint32 -> float32)
const float64explode : (flt : float64 -> (bool, int64, int64))
const float32explode : (flt : float32 -> (bool, int32, int32))
;;
const float64bits = {flt; -> (&flt castto(int64#))#}
const float32bits = {flt; -> (&flt castto(int32#))#}
const float64frombits = {bits; -> (&bits castto(float64#))#}
const float32frombits = {bits; -> (&bits castto(float32#))#}
const float64explode = {flt
var bits, isneg, mant, exp
bits = float64bits(flt)
isneg = (bits >> 63) == 0 /* msb is sign bit */
exp = (bits >> 52) & 0x7ff /* exp is in bits [52..63] */
mant = bits & ((1l << 52) - 1) /* msb is in bits [..51] */
/* add back the implicit bit if this is not a denormal */
if exp != 0
mant |= 1l << 52
else
exp = 1
;;
/*
adjust for exponent bias. nb: because we are
treating the mantissa as m.0 instead of 0.m,
our exponent bias needs to be offset by the
size of m
*/
-> (isneg, mant, exp)
}
const float32explode = {flt
var bits, isneg, mant, exp
bits = float32bits(flt)
isneg = (bits >> 31) == 0 /* msb is sign bit */
exp = (bits >> 22) & 0xff /* exp is in bits [23..30] */
mant = bits & ((1 << 22) - 1) /* msb is in bits [0..22] */
/* add back the implicit bit if this is not a denormal */
if exp != 0
mant |= 1 << 22
else
exp = 1
;;
/*
adjust for exponent bias. nb: because we are
treating the mantissa as m.0 instead of 0.m,
our exponent bias needs to be offset by the
size of m
*/
-> (isneg, mant, exp)
}