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math/big: update comment on Int.GCD 

Per the suggestion https://golang.org/cl/216200/2/doc/go1.14.html#423.

Updates #28878.

Change-Id: I654d2d114409624219a0041916f0a4030efc7573
Reviewed-on: https://go-review.googlesource.com/c/go/+/217104
Reviewed-by: Ian Lance Taylor <iant@golang.org>
This commit is contained in:
Robert Griesemer 2020-01-30 12:26:20 -08:00
parent 68b55ab513
commit 9bb40ed8ec
1 changed files with 2 additions and 0 deletions
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2
src/math/big/int.go
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@ -504,6 +504,8 @@ func (z *Int) Exp(x, y, m *Int) *Int {
// GCD sets z to the greatest common divisor of a and b and returns z.
// If x or y are not nil, GCD sets their value such that z = a*x + b*y.
// As of Go 1.14, a and b may be zero or negative (before Go 1.14 both
// a and b had to be > 0).
// Regardless of the signs of a and b, z is always >= 0.
// If a == b == 0, GCD sets z = x = y = 0.
// If a == 0 and b != 0, GCD sets z = |b|, x = 0, y = sign(b) * 1.