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big: bug fix for division
Fixes #784. R=rsc CC=golang-dev https://golang.org/cl/1196043
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@ -528,10 +528,15 @@ func (z nat) divLarge(u, uIn, v nat) (q, r nat) {
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n := len(v)
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m := len(uIn) - n
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// determine if z can be reused
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if alias(z, uIn) || alias(z, v) {
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z = nil // z is an alias for uIn or v - cannot reuse
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}
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q = z.make(m + 1)
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qhatv := make(nat, n+1)
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if alias(u, uIn) {
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u = nil // u is an alias for uIn - cannot reuse
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if alias(u, uIn) || alias(u, v) {
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u = nil // u is an alias for uIn or v - cannot reuse
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}
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u = u.make(len(uIn) + 1)
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u.clear()
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