mirror of
https://github.com/make-42/xyosc
synced 2025-01-18 18:57:10 +01:00
36 lines
706 B
Go
36 lines
706 B
Go
package math32
|
|
|
|
// Modf returns integer and fractional floating-point numbers
|
|
// that sum to f. Both values have the same sign as f.
|
|
//
|
|
// Special cases are:
|
|
// Modf(±Inf) = ±Inf, NaN
|
|
// Modf(NaN) = NaN, NaN
|
|
func Modf(f float32) (int float32, frac float32) {
|
|
return modf(f)
|
|
}
|
|
|
|
func modf(f float32) (int float32, frac float32) {
|
|
if f < 1 {
|
|
switch {
|
|
case f < 0:
|
|
int, frac = Modf(-f)
|
|
return -int, -frac
|
|
case f == 0:
|
|
return f, f // Return -0, -0 when f == -0
|
|
}
|
|
return 0, f
|
|
}
|
|
|
|
x := Float32bits(f)
|
|
e := uint(x>>shift)&mask - bias
|
|
|
|
// Keep the top 9+e bits, the integer part; clear the rest.
|
|
if e < 32-9 {
|
|
x &^= 1<<(32-9-e) - 1
|
|
}
|
|
int = Float32frombits(x)
|
|
frac = f - int
|
|
return
|
|
}
|