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authorDamien George <damien@micropython.org>2021-11-30 00:31:46 +1100
committerDamien George <damien@micropython.org>2021-12-21 18:00:05 +1100
commit2c139bbf4e5724ab253b5b034ce925e04267a9c4 (patch)
tree68837dc2bebd0350d59b7ab50fbf0c4cab275676 /tests/basics/sys_path.py
parent05bea70979232629e059a7453fb7965545113d9f (diff)
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py/mpz: Fix bugs with bitwise of -0 by ensuring all 0's are positive.
This commit makes sure that the value zero is always encoded in an mpz_t as neg=0 and len=0 (previously it was just len=0). This invariant is needed for some of the bitwise operations that operate on negative numbers, because they cannot handle -0. For example (-((1<<100)-(1<<100)))|1 was being computed as -65535, instead of 1. Fixes issue #8042. Signed-off-by: Damien George <damien@micropython.org>
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