Some notes while I continue investigating the problem:

 - while I used the last test in test/test.js to highlight the problem,
it isn't the only one that is failing

 - both sha.js and sha1.js are affected (unsurprisingly, as they have
very similar implementations), other algorithms (sha224, sha256, sha384
and sha512) behave correctly

 - I don't have a good understanding of what's going on yet, but
successive calls to the update() method on the hash object start
diverging values when calling ft(s, b, c, d), and the divergence happens
only when s === 2. Inlining the function doesn't fix the problem.

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https://bugs.launchpad.net/bugs/1887144

Title:
  autopkgtest failures on ppc64el with nodejs 12.18.1

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