Emscripten: use better _Py_Version computation for worker module
#129757
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_Py_Version computation for worker module_Py_Version computation for worker module
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…ython#129757) Use integer bit shifting instead of conversion to strings to compute Python version.
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…ython#129757) Use integer bit shifting instead of conversion to strings to compute Python version.
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Related to gh-127113
This is a small PR that improves the _Py_Version check for the Python worker module file for the Emscripten builds, which was last modified in https://github.com/python/cpython/pull/127113/files#diff-31f61a127a59386957acba86e9acedf0a96bc6ebe1ac159a48e39b1a291111b5R73-R75. I reviewed the corresponding change downstream in pyodide/pyodide#5406 and suggested this change, and @hoodmane suggested that I should upstream the change here.
The idea is that we were converting a number to a hex string, then padding that string, splitting it up, and then bringing it back by parsing it to an integer – these operations are unnecessary. We can instead use an unsigned right shift and apply a bitmask to grab the relevant bytes. For the format
0xMMmmpp00, this means that the major version is in bits 24–31, the minor version in bits 16–23, and the patch/micro version in bits 8–15. These bit operations should be more direct.