[issue38252] Use 8-byte step to detect ASCII sequence in 64bit Windows builds

[Ma Lin]

Change by Ma Lin <malincns at 163.com>:


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title: micro-optimize ucs1lib_find_max_char in Windows 64-bit build -> Use 8-byte step to detect ASCII sequence in 64bit Windows builds

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Python tracker <report at bugs.python.org>
<https://bugs.python.org/issue38252>
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