func tc64(f float64) float64 {
if runtime.GOOS == "nacl" {
return hx.CallFloat("", "Go_haxegoruntime_FFloat64frombits.hx", 1,
hx.CallDynamic("", "Go_haxegoruntime_FFloat64bits.hx", 1, f))
}
return f
}
// Float64bits returns the IEEE 754 binary representation of f.
//func Float64bits(f float64) uint64 { return *(*uint64)(unsafe.Pointer(&f)) }
func Float64bits(f float64) uint64 {
if hx.GetBool("", "Object.nativeFloats") {
var t float64 = f
return *(*uint64)(unsafe.Pointer(&t))
}
switch runtime.GOARCH {
case "cs":
return uint64(hx.Int64(hx.CallDynamic("", "Force.Float64bits", 1, f)))
// TODO js/cpp/neko short-cut - using Force.f64byts
//case "js", "cpp", "neko":
// return uint64(hx.Int64(hx.CallDynamic("", "Force.Float64bits", 1, f)))
}
// below from math.IsInf
if f > MaxFloat64 {
return uvinf
}
if f < -MaxFloat64 {
return uvneginf
}
if f != f { // NaN
if f < 0 { // -NaN ?
return uvnan | uint64(1)<<63
}
//return 9221120237041090561
return uvnan
}
if f == 0 {
if 1/f < -MaxFloat64 { // dividing by -0 gives -Inf
return uint64(1) << 63
}
return 0
}
s := uint64(0)
if f < hx.GetFloat("", "0") {
s = 1 << 63
f = -f
}
e := uint32(1023 + 52)
for f >= float64(int64(1<<53)) {
f /= hx.GetFloat("", "2")
e++
if e == uint32((1<<11)-1) {
break
}
}
for f < float64(int64(1<<52)) {
e--
if e == 0 {
break
}
f *= hx.GetFloat("", "2")
}
return s | uint64(e)<<52 | (uint64(f) &^ (1 << 52))
}