[issue42176] Valgrind reports "Conditional jump or move depends on uninitialised value(s)" in `PyUnicode_AsEncodedString` and `PyUnicode_Decode`

[Serhiy Storchaka]

Serhiy Storchaka <storchaka+cpython at gmail.com> added the comment:

It points on strcmp(lower, "us_ascii") == 0.

Seems that the compiler optimizes calling strcmp() with compile-time constant "us_ascii" by reading and comparing first 8 bytes as single word. But if lower contains "latin1" it has only 7 bytes initialized, and the 8-th is not initialized. It does not affect the result, but valgrind complains. Looks like a bug in valgrind.

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nosy: +serhiy.storchaka

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<https://bugs.python.org/issue42176>
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