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math: special cases for Fmod

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Added special case tests to all_test.go for Fmod. Fixed Fmod [hung
for Fmod(+/-Inf, <finite>)]. Also added test for Ceil in all_test.go.

R=rsc
CC=golang-dev
https://golang.org/cl/186076
This commit is contained in:
Charles L. Dorian 2010-01-11 16:20:51 -08:00 • committed by Russ Cox
parent 14992a4e4b
commit 3c7534104a
2 changed files with 124 additions and 5 deletions
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16
src/pkg/math/fmod.go
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@ -1,4 +1,4 @@
// Copyright 2009 The Go Authors. All rights reserved.
// 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.
@ -6,13 +6,21 @@ package math
/*
Floating-point mod func without infinity or NaN checking
Floating-point mod function.
*/
// Fmod 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:
// if x is not finite, Fmod returns NaN
// if y is 0 or NaN, Fmod returns NaN
func Fmod(x, y float64) float64 {
if y == 0 {
return x
// TODO(rsc): Remove manual inlining of IsNaN, IsInf
// when compiler does it for us.
if y == 0 || x > MaxFloat64 || x < -MaxFloat64 || x != x || y != y { // y == 0 || IsInf(x, 0) || IsNaN(x) || IsNan(y)
return NaN()
}
if y < 0 {
y = -y