Optimize bytes.fromhex() and bytearray.fromhex()
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
diff --git a/Doc/whatsnew/3.6.rst b/Doc/whatsnew/3.6.rst
index d1e5045..edacea1 100644
--- a/Doc/whatsnew/3.6.rst
+++ b/Doc/whatsnew/3.6.rst
@@ -161,6 +161,9 @@
* ``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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