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Optimize bytes.fromhex() and bytearray.fromhex()

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Issue #25401: Optimize bytes.fromhex() and bytearray.fromhex(): they are now
between 2x and 3.5x faster. Changes:

* Use a fast-path working on a char* string for ASCII string
* Use a slow-path for non-ASCII string
* Replace slow hex_digit_to_int() function with a O(1) lookup in
  _PyLong_DigitValue precomputed table
* Use _PyBytesWriter API to handle the buffer
* Add unit tests to check the error position in error messages
This commit is contained in:
Victor Stinner 2015-10-14 11:25:33 +02:00
parent ebcf9edc05
commit 2bf8993db9
7 changed files with 101 additions and 95 deletions
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Doc/whatsnew/3.6.rst
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@ -161,6 +161,9 @@ Optimizations
* ``bytearray % args`` is now between 2.5 and 5 times faster. (Contributed by
Victor Stinner in :issue:`25399`).
* Optimize :meth:`bytes.fromhex` and :meth:`bytearray.fromhex`: they are now
between 2x and 3.5x faster. (Contributed by Victor Stinner in :issue:`25401`).
Build and C API Changes
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