eesrajm@cc.brunel.ac.uk (Andrew J Michael) (01/15/91)
Has anyone got any PD floating point routines that I can use for a port of gcc-1.38 to the 386 ? I'm not using a 80387, and gas assembler format would be preferred ..... Thanks in advance Andy Michael -- Andy Michael (eesrajm@cc.brunel.ac.uk) "You might think that. I 85 Hawthorne Crescent couldn't possibly comment." West Drayton Middlesex UB7 9PA
steveq@syd.dms.CSIRO.AU (Stephen Quigg) (01/18/91)
In article <1950@Terra.cc.brunel.ac.uk> eesrajm@cc.brunel.ac.uk (Andrew J Michael) writes: >Has anyone got any PD floating point routines that I can use for >a port of gcc-1.38 to the 386 ? I'm not using a 80387, and gas >assembler format would be preferred ..... > >Thanks in advance > >Andy Michael > ------------------------------------------------------------------------------ This has been asked a few times, and the following may be of interest. It is part of the README file for a package available via ftp from; suphys.physics.su.oz.au (129.78.129.1) in directory Esix/src/math. You will still need an emulator for the 387 if you do not have one, (any offers :-) ), but it's a good start. ------------------------------------------------------------------------------- VERSION: This is version 2.0 -------- This is version 2.0 of the alternative 386 math library. It supplants all previous versions. Version Notes ------------- The main change between 1.1 and 2.0 is that all functions are now available in float versions. To use them you need gcc/gas in order to create the library (libffpu.a) and an ANSI C compiler to compile your source code because K&R-1 compilers pass all floating point argumnets to functions as doubles and this is not the desired behaviour. The float function names are formed from the double versions by appending an 'f', for example sin -> sinf. These functions are fully prototyped in fpumath.h. Note that jn and yn are not available at this time. Three libraries are now built: libfpu.a - double version libffpu.a - float version libcfpu.a - combined version The speed difference between floats and doubles is dependent on the instruction mix - from memory operands or on stack operands. Floats are faster to load from memory but once on the stack, all operations occur on the 80 bit temporary real representation. To use the float version effectively you really need an ANSI stdio implementation. Introduction ------------ The files in this directory consist of assembler and C source for an alternative maths library for Unices (including Xenix) running on an 80386/80387 combination and using gcc/gas as the compiler system. These routines are typically from 2 to 10 times faster than those in the supplied maths library; assuming that your library, like mine (ESIX rev. D and Xenix 2.3.2), does not use the '387 inbuilts to perform transcendental calculations. For those of you without a '387 you must use the full emulator and consequently may not see any speed up. I haven't tried. Under Xenix you must have a '387---some of the '387 instructions are not emulated. If you have a '287 your in the same boat; some of the assembler routines won't work. I have coded the additional IEEE 754 required functions to provide a conforming double precision implementation. You require gcc/gas in order to compile the assembler source code. People who are using SUN 386i's (Roadrunner) may also find this useful. I have found that writing good low level numerical code is far harder than I initially thought it would be. But I've learnt a lot, and I still enjoy doing it. File List --------- CHANGELOG atanhf.s expm1f.s j0.c rint.s COPYING ceil.s fabs.s j0f.c rintf.s COPYRIGHT ceilf.s fabsf.s j1.c scalb.s Makefile copysign.s finite.s j1f.c scalbf.s PROBLEMS copysignf.s finitef.s lgamma.c setcont.s README cos.s floor.s lgammaf.c setinternal.s TODO cosf.s floorf.s log.s sin.s _getsw.s cosh.s fmod.s log10.s sinf.s acos.s coshf.s fmodf.s log10f.s sinh.s acosf.s d2dcomb.summ fpumath.h log1p.s sinhf.s acosh.s drem.s gamma.c log1pf.s sqrt.s acoshf.s dremf.s gammaf.c log2.s sqrtf.s asin.s erf.c hypot.s log2f.s sqrtp.s asinf.s erff.c hypotf.s logb.s sqrtpf.s asinh.s exp.s ieee_ext.s logbf.s tan.s asinhf.s exp10.s ieee_extf.s logf.s tanf.s atan.s exp10f.s ieee_retro.c nextafter.c tanh.s atan2.s exp2.s ieee_values.s nextafterf.c tanhf.s atan2f.s exp2f.s ieee_valuesf.s paranoia.c atanf.s expf.s infinity.s pow.s atanh.s expm1.s infinityf.s powf.s