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big: do not modify divisor

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Fixes #1907.

R=rsc
CC=golang-dev
https://golang.org/cl/4527096
This commit is contained in:
Robert Griesemer 2011-06-02 11:07:41 -07:00
parent 4d15577783
commit 191a6bfc5e
1 changed files with 6 additions and 2 deletions
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8
src/pkg/big/nat.go
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@ -551,7 +551,12 @@ func (z nat) divLarge(u, uIn, v nat) (q, r nat) {
// D1.
shift := Word(leadingZeros(v[n-1]))
shlVW(v, v, shift)
if shift > 0 {
// do not modify v, it may be used by another goroutine simultaneously
v1 := make(nat, n)
shlVW(v1, v, shift)
v = v1
}
u[len(uIn)] = shlVW(u[0:len(uIn)], uIn, shift)
// D2.
@ -592,7 +597,6 @@ func (z nat) divLarge(u, uIn, v nat) (q, r nat) {
q = q.norm()
shrVW(u, u, shift)
shrVW(v, v, shift)
r = u.norm()
return q, r