Stefan Krah <ste...@bytereef.org> added the comment:

I found an unused i386 box with OpenBSD and Linux (so no VM):

A C program with tan(1.5707963267948961) is wrong on both systems.

fdlibm (directly from netlib.org) is correct on both systems.


Both OS versions are relatively old, so I cannot file an upstream issue.

I was planning to dig through the fdlibm code if there was an issue,
but it produces the correct results.

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