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a59a27564b
The bug number was a typo, and I forgot to switch the implementation back to if statements after the change from Float64bits in the first patchset back to branching. if statements can currently be inlined, but switch cannot (#13071) Change-Id: I81d0cf64bda69186c3d747a07047f6a694f8fa70 Reviewed-on: https://go-review.googlesource.com/16446 Reviewed-by: Robert Griesemer <gri@golang.org> Run-TryBot: Brad Fitzpatrick <bradfitz@golang.org> TryBot-Result: Gobot Gobot <gobot@golang.org>
24 lines
591 B
Go
24 lines
591 B
Go
// Copyright 2009 The Go Authors. All rights reserved.
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// Use of this source code is governed by a BSD-style
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// license that can be found in the LICENSE file.
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package math
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// Abs returns the absolute value of x.
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//
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// Special cases are:
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// Abs(±Inf) = +Inf
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// Abs(NaN) = NaN
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func Abs(x float64) float64 {
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// TODO: once golang.org/issue/13095 is fixed, change this to:
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// return Float64frombits(Float64bits(x) &^ (1 << 63))
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// But for now, this generates better code and can also be inlined:
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if x < 0 {
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return -x
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}
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if x == 0 {
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return 0 // return correctly abs(-0)
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}
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return x
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}
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