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-rw-r--r--src/math/modf.go37
1 files changed, 37 insertions, 0 deletions
diff --git a/src/math/modf.go b/src/math/modf.go
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+++ b/src/math/modf.go
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+// 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
+
+// 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 float64) (int float64, frac float64)
+
+func modf(f float64) (int float64, frac float64) {
+ 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 := Float64bits(f)
+ e := uint(x>>shift)&mask - bias
+
+ // Keep the top 12+e bits, the integer part; clear the rest.
+ if e < 64-12 {
+ x &^= 1<<(64-12-e) - 1
+ }
+ int = Float64frombits(x)
+ frac = f - int
+ return
+}