Mark Dickinson added the comment:
Okay, so after looking more closely, this *still* looks like a false positive:
`lo0bits` *can* return 32, but only for an input of zero. In the code in
question, we're doing `k = lo0bits(&y)`, so the only way we can get a `k` of
`32` is if `y = 0`. But the whole thing is inside an "if" block that looks
like `if ((y = word1(d))) { ... }` (yep, completely with the extra parentheses
and the misleading equality-test-lookalike assignment), so that `if` block
won't be executed if `y` is zero.
I edited the code to print out debugging information if `k` is ever 32 at that
point, and saw no output. So I don't think that line ever gets executed with
`k = 32`.
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<http://bugs.python.org/issue23999>
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