bpo-46233: Minor speedup for bigint squaring #30345
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x_mul()'s special code for squaring does a bit of useless work at the end of each digit pass. Clean it up.
is in fact 0 or 1. Since 1 is unlikely, don't increment pz unless it is 1, to possibly save another trivial cycle in the common case.
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x_mul()'s special code for squaring does a bit of useless work at
the end of each digit pass. Clean it up.
https://bugs.python.org/issue46233