Hi! 19.12.2021 19:28, J. Gareth Moreton via fpc-devel:
To throw my hat into the ring, I'd be willing to help out with developing some library routines. I did experiment once with using a truncated and factorised MacLaurin series to calculate Double-precision sin and cos simultaneously in native SSE2 (with sin and cos filling two elements of the same register), mainly so one wouldn't be forced to use the floating-point stack on 64-bit (the speed was about the same). For 128-bit though, I imagine it would have to be fully emulated, down to how the mantissa and exponent are interpreted. I admit I haven't studied the sfpu128 unit yet. If you need "log" and "exp" implmented in software, if you can give me the exact requirements and specifications, I'll see what I can do.
Well x87 does include log and exp (kind of), so bochs does too. It is known to successfully run lots of ancient 86/87 software, so I'd suppose this x87 emulation should be pretty much stable. Apparently, x87 implementation in bochs is not tied to any sort of host-side floating-point capabilities, so it is portable. IIRC some people reported they used it on ARM.
Regards, Nikolai
Gareth aka. Kit
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