From 9bb40ed8ecb8e6e470c70e169cb3cecb2e9dc69a Mon Sep 17 00:00:00 2001 From: Robert Griesemer Date: Thu, 30 Jan 2020 12:26:20 -0800 Subject: [PATCH] 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 --- src/math/big/int.go | 2 ++ 1 file changed, 2 insertions(+) diff --git a/src/math/big/int.go b/src/math/big/int.go index bf1fa73cce..019af616d7 100644 --- a/src/math/big/int.go +++ b/src/math/big/int.go @@ -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. -- 2.50.0