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math/big: recognize squaring for Floats

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Updates #13745

Recognize z.Mul(x, x) as squaring for Floats and use
the internal z.sqr(x) method for nat on the mantissa.

Change-Id: I0f792157bad93a13cae1aecc4c10bd20c6397693
Reviewed-on: https://go-review.googlesource.com/56774
Reviewed-by: Robert Griesemer <gri@golang.org>
Run-TryBot: Robert Griesemer <gri@golang.org>
TryBot-Result: Gobot Gobot <gobot@golang.org>
This commit is contained in:
Brian Kessler 2017-08-17 23:26:31 -07:00 committed by Robert Griesemer
parent fe08ebaebb
commit 497f891fce
1 changed files with 5 additions and 2 deletions
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7
src/math/big/float.go
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@ -1311,8 +1311,11 @@ func (z *Float) umul(x, y *Float) {
// TODO(gri) Optimize this for the common case.
e := int64(x.exp) + int64(y.exp)
z.mant = z.mant.mul(x.mant, y.mant)
if x == y {
z.mant = z.mant.sqr(x.mant)
} else {
z.mant = z.mant.mul(x.mant, y.mant)
}
z.setExpAndRound(e-fnorm(z.mant), 0)
}