[mypyc] lib-rt base64: support pyodide for Python 3.12 #20342
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For Python 3.12, pyodide requires emscripten 3.1.{46,52,58}, which uses an older
version of SIMDe that doesn't include all the NEON 64-bit intrinsics we need.
So we use the 32-bit NEON intrinsics implementation of base64 for Pyodide on
Python 3.12, and use the 64-bit NEON intrinsics implementations of
base64 for Pyodide on Python 3.13.
Pyodide for Python 3.13 uses emscripten 4.0.{6,8,9}
Emscripten versdion 3.1.63 appears to be the first version with the
updated SIMDe versions:
emscripten-core/emscripten@6223c43
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I tested locally with the librt smoke tests using pyodide & Python 3.13 and Python 3.12 😃 |
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mr-c
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Dec 1, 2025
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Thank you @ilevkivskyi test builds are running over in the librt repo: https://github.com/mypyc/librt/actions/runs/19826036041/job/56799561968?pr=19 |
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Fixes the issue reported at mypyc/librt#14 (comment)
For Python 3.12, the pyodide_2024_0 ABI requires emscripten 3.1.58, which uses an older version of SIMDe that doesn't include all the NEON 64-bit intrinsics we need.
So we use the 32-bit NEON intrinsics implementation of base64 for Pyodide on Python 3.12, and use the 64-bit NEON intrinsics implementations of base64 for Pyodide on Python 3.13.
Pyodide for Python 3.13, the pyodide_2025_0 ABI, uses emscripten 4.0.9
Emscripten versdion 3.1.63 appears to be the first version with the updated SIMDe versions:
emscripten-core/emscripten@6223c43