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math: fix typo and braino in my earlier commit

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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>
This commit is contained in:
Brad Fitzpatrick 2015-10-29 13:02:28 -07:00
parent d821ae2a9e
commit a59a27564b
1 changed files with 4 additions and 4 deletions
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8
src/math/abs.go
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@ -10,13 +10,13 @@ package math
// Abs(±Inf) = +Inf
// Abs(NaN) = NaN
func Abs(x float64) float64 {
// TODO: once golang.org/issue/13905 is fixed, change this to:
// TODO: once golang.org/issue/13095 is fixed, change this to:
// return Float64frombits(Float64bits(x) &^ (1 << 63))
// But for now, this generates better code and can also be inlined:
switch {
case x < 0:
if x < 0 {
return -x
case x == 0:
}
if x == 0 {
return 0 // return correctly abs(-0)
}
return x