blob: b7dd90ee8282888e0781441187d64e4f52a59833 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
|
// Copyright 2009 The Go Authors. All rights reserved.
// Use of this source code is governed by a BSD-style
// license that can be found in the LICENSE file.
package math
export fmod
/*
* floating-point mod func without infinity or NaN checking
*/
func
fmod(x, y float64) float64
{
var yexp, rexp int;
var r, yfr, rfr float64;
var sign bool;
if y == 0 {
return x;
}
if y < 0 {
y = -y;
}
yfr,yexp = sys.frexp(y);
sign = false;
if x < 0 {
r = -x;
sign = true;
} else {
r = x;
}
for r >= y {
rfr,rexp = sys.frexp(r);
if rfr < yfr {
rexp = rexp - 1;
}
r = r - sys.ldexp(y, rexp-yexp);
}
if sign {
r = -r;
}
return r;
}
|
