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It's much clearer if you read one of the source code of the libm.

Plan 9: https://9p.io/sources/plan9/sys/src/libc/port/sin.c

Freebsd: https://cgit.freebsd.org/src/tree/lib/msun/src/k_sin.c



FreeBSD code is missing the range reduction step (it's named a "kernel" for the reason): https://cgit.freebsd.org/src/tree/lib/msun/src/e_rem_pio2.c


Ah, I always referred to the musl implmenetation, but I just now realized that they copied the Freebsd one.


it says "Copyright (C) 1993 by Sun Microsystems, Inc. All rights reserved."

and the directory name is literally: `msun`


Does 9front keep the same sin.c implementation?


http://git.9front.org/plan9front/plan9front/HEAD/sys/src/lib...




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