From: Russ Cox <rsc@golang.org>
Date: Fri, 9 May 2014 20:04:03 +0000 (-0400)
Subject: math/cmplx: specify which square root Sqrt returns
X-Git-Tag: go1.3beta2~114
X-Git-Url: http://www.git.cypherpunks.su/?a=commitdiff_plain;h=2182d5786b728bc2371b40f689ca73ee9df0cd88;p=gostls13.git

math/cmplx: specify which square root Sqrt returns

Fixes #7851.

LGTM=bradfitz
R=golang-codereviews, bradfitz
CC=golang-codereviews
https://golang.org/cl/93200043
---

diff --git a/src/pkg/math/cmplx/sqrt.go b/src/pkg/math/cmplx/sqrt.go
index 179b5396ab..4ef6807add 100644
--- a/src/pkg/math/cmplx/sqrt.go
+++ b/src/pkg/math/cmplx/sqrt.go
@@ -54,6 +54,7 @@ import "math"
 //    IEEE      -10,+10   1,000,000     2.9e-16     6.1e-17
 
 // Sqrt returns the square root of x.
+// The result r is chosen so that real(r) ≥ 0 and imag(r) has the same sign as imag(x).
 func Sqrt(x complex128) complex128 {
 	if imag(x) == 0 {
 		if real(x) == 0 {