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math/big: implement fast path in Float.SetRat if argument is integer

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Change-Id: Ib82500e198b86e9fade278c7eea7a4b0c6b0b2e1
Reviewed-on: https://go-review.googlesource.com/4921
Reviewed-by: Rob Pike <r@golang.org>
This commit is contained in:
Robert Griesemer 2015-02-14 21:29:37 -08:00
parent 52dadc1f31
commit 61c9c3ddc4
1 changed files with 3 additions and 1 deletions
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4
src/math/big/float.go
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@ -582,7 +582,9 @@ func (z *Float) SetInt(x *Int) *Float {
// If z's precision is 0, it is changed to the largest of a.BitLen(),
// b.BitLen(), or 64; with x = a/b.
func (z *Float) SetRat(x *Rat) *Float {
// TODO(gri) can be more efficient if x is an integer
if x.IsInt() {
return z.SetInt(x.Num())
}
var a, b Float
a.SetInt(x.Num())
b.SetInt(x.Denom())