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flier / pyfasthash

Python Non-cryptographic Hash Library
Apache License 2.0
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Improper detection of instruction set #48

Closed aschankler closed 3 years ago

aschankler commented 3 years ago

setup.py incorrectly enables instruction set extensions in two cases:

  1. As of 5f81262, all extensions are automatically enabled on an x64 cpu without the cpuid package. This guess is not always correct, but the user is never warned.
  2. The cpuid function _is_set returns strings 'YES' and '--' (both of which are truthy). This again enables all extensions, even if they are not present.