Module Name: src
Committed By: isaki
Date: Fri Apr 19 13:31:11 UTC 2013
Modified Files:
src/sys/arch/m68k/fpe: files.fpe fpu_emulate.h fpu_hyperb.c fpu_trig.c
Added Files:
src/sys/arch/m68k/fpe: fpu_cordic.c
Log Message:
Introduce the CORDIC algorithm.
o sine and cosine (e.g., FSIN, FCOS and FSINCOS instructions) is now
calculated in the CORDIC instead of Taylor expansion.
o tangent (FTAN) is not touched from a viewpoint of the code size.
o The CORDIC is applicable for hyperbolic functions (e.g., FSINH,
FCOSH, FTANH instructions), but I didn't use it because its working
range is poor.
o The CORDIC is also usable for inverse trigonometric functions,
I will commit it at next phase.
o The code size becomes a bit big. I cannot evaluate speed on m68k
for some reasons, but in test on i386 the CORDIC is approximately
100 times faster in sin/cos.
To generate a diff of this commit:
cvs rdiff -u -r1.2 -r1.3 src/sys/arch/m68k/fpe/files.fpe
cvs rdiff -u -r0 -r1.1 src/sys/arch/m68k/fpe/fpu_cordic.c
cvs rdiff -u -r1.23 -r1.24 src/sys/arch/m68k/fpe/fpu_emulate.h
cvs rdiff -u -r1.8 -r1.9 src/sys/arch/m68k/fpe/fpu_hyperb.c
cvs rdiff -u -r1.10 -r1.11 src/sys/arch/m68k/fpe/fpu_trig.c
Please note that diffs are not public domain; they are subject to the
copyright notices on the relevant files.
