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.
Gareth aka. Kit
On 19/12/2021 13:52, Florian Klämpfl via fpc-devel wrote:
Am 19.12.2021 um 14:38 schrieb Jonas Maebe via fpc-devel
<fpc-devel@lists.freepascal.org>:
On 19/12/2021 14:21, Nikolai Zhubr via fpc-devel wrote:
Just out of curiosity, couldn't bochs' x87 fpu implementation be of some use
here?
It is approx 12k of C code and it is LGPL. Supposedly it is not fast but
conformant.
Or does it need to be (re-)implemented in Pascal itself?
(Not implying it would be easy anyway, but still)
Note that FPC needs LGPL + static linking exception (the softfloat units are in
the RTL).
Nikolai might be right, looking at it’s license it seems usable:
https://github.com/lubomyr/bochs/blob/master/cpu/fpu/fsincos.cc
Same as the softfloat code we use it seems.
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