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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-28 13:16:40 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-28 13:16:40 +0000
commit47ab3d4a42e9ab51c465c4322d2ec233f6324e6b (patch)
treea61a0ffd83f4a3def4b36e5c8e99630c559aa723 /src/math/mod.go
parentInitial commit. (diff)
downloadgolang-1.18-upstream.tar.xz
golang-1.18-upstream.zip
Adding upstream version 1.18.10.upstream/1.18.10upstream
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/math/mod.go')
-rw-r--r--src/math/mod.go51
1 files changed, 51 insertions, 0 deletions
diff --git a/src/math/mod.go b/src/math/mod.go
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+++ b/src/math/mod.go
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+// Copyright 2009-2010 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
+
+/*
+ Floating-point mod function.
+*/
+
+// Mod returns the floating-point remainder of x/y.
+// The magnitude of the result is less than y and its
+// sign agrees with that of x.
+//
+// Special cases are:
+// Mod(±Inf, y) = NaN
+// Mod(NaN, y) = NaN
+// Mod(x, 0) = NaN
+// Mod(x, ±Inf) = x
+// Mod(x, NaN) = NaN
+func Mod(x, y float64) float64 {
+ if haveArchMod {
+ return archMod(x, y)
+ }
+ return mod(x, y)
+}
+
+func mod(x, y float64) float64 {
+ if y == 0 || IsInf(x, 0) || IsNaN(x) || IsNaN(y) {
+ return NaN()
+ }
+ y = Abs(y)
+
+ yfr, yexp := Frexp(y)
+ r := x
+ if x < 0 {
+ r = -x
+ }
+
+ for r >= y {
+ rfr, rexp := Frexp(r)
+ if rfr < yfr {
+ rexp = rexp - 1
+ }
+ r = r - Ldexp(y, rexp-yexp)
+ }
+ if x < 0 {
+ r = -r
+ }
+ return r
+}