Difference: FloatingPointUnit (35 vs. 36)

Revision 362022-11-18 - PeterSchmid

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Do not use FPU in interrupt service routines.
Tasks/Threads with FPU operations need much more return stack depth.

Changed:

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Rounding is not always working properly. useful for precision more than 3.

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Rounding is not always working properly. Not useful for precision more than 3.

0.1005e fs. 1.01E-1  ok.
0.1005e fm. 101m ok.

Line: 107 to 107

Changed:

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<

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Newlib
The Forth Scientific Library e.g. for ANS Forth Complex Arithmetic Lexicon

Line: 411 to 412

vmov tos, s0 1 bx lr Cycles 5

Added:

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Added:

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Swift-Forth on a 64 bit Windows PC @ 3.4 GHz, HW FPU

: test ( --  ) \ test 1'000 times sin, displays time in us
  ucounter cr
  pi 2e f* 1000e f/  \ 2*pi/1000
  cr
  1000 0 do
    fdup i s>f f*      fdrop
\    fdup i s>f f* fsin fdrop
\    i .  fdup i s>f f* fsin fs.   cr
\    i .  fdup i s>f f* fsin hex. hex.  cr
  loop
  fdrop
  utimer
;

Added:

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> 91 us, 28 us -> 63 ns for fsin. 2 magnitudes faster than Mecrisp-Cube M4F @ 32 MHz

Conclusion

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