math/big: incorrect handling of aliased inputs in GCD #30217
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Change https://golang.org/cl/162517 mentions this issue: |
katiehockman
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NeedsDecision
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/cc @griesemer |
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Change https://golang.org/cl/168257 mentions this issue: |
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What version of Go are you using (
go version)?Does this issue reproduce with the latest release?
Yes
What operating system and processor architecture are you using (
go env)?go envOutputWhat did you do?
Calculate the cofactors x, y using the input variables (a, b) to store the result
d.GCD(x, y, a, b) --> x = 1, y = -1 (correct)
d.GCD(a, b, a, b) --> a = 1, b = 1 (incorrect)
d.GCD(b, a, a, b) --> b = 1, a = -6 (incorrect)
https://play.golang.org/p/KwX7hGGIHu_k
What did you expect to see?
Correct results that match when independent x, y are used.
What did you see instead?
Incorrect results when x and y reference the input variables a, b.
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