SHTns runtime error on Apple M1: bad SHT accuracy

[Former user]

Compiling and using SHTns on the new Apple M1 computer (ARM based) leads to Accuracy test failed. Please file a.... *** [SHTns] Run-time error : bad SHT accuracy

[Martin Schreiber]

This seems to be related to the chosen number of spectral modes. E.g. 336 works without this error and the results look nice, but 334 creates this error output.

[Nathanaël Schaeffer]

mmm… I don’t have access to the M1.
Can you tell me more? What version/commit? What simd flavour is detected (if any)? This information is available on the output line starting with “[SHTns”

What happens when configured with --disable-simd ?

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[Martin Schreiber]

II tried this recently with the version 3.5.2 and this problem doesn’t show up anymore.

It might have been related to a buggy toolchain.

[Nathanaël Schaeffer]

Maybe a bggy toolchain, but it was possibly also fixed by commit 737d0da which made it in v3.5.2.