From:	tph1001 AT cus DOT cam DOT ac DOT uk (T.P Harte)
Newsgroups:	comp.sys.sun.hardware,comp.lang.c++,comp.os.msdos.djgpp,comp.lang.asm.x86
Subject:	g++ assembler templates
Date:	18 Mar 1997 14:21:29 GMT
Organization:	University of Cambridge, England
Lines:	219
Message-ID:	<5gm8d9$96@lyra.csx.cam.ac.uk>
NNTP-Posting-Host:	ursa.cus.cam.ac.uk
To:	djgpp AT delorie DOT com
DJ-Gateway:	from newsgroup comp.os.msdos.djgpp

i picked up some code recently and need to translate its
80386-compatible g++assembler templates (see below) 
into something that i can run on my SPARC.

trouble is,  i haven't done any assembly for years (it was on
a 8086 then) and don't know how to do so for a SPARC.

i want to know if code such as below can be translated into
something that can be compiled for a SPARCclassic or 
whether it is generic Intel asm stuff and would need major re-working
obviously some degree of rooting around is going to have to be done
but i don't know if the job is too large as the architectures 
are obviously substantially different being RISC/CISC resp.

the asm templates are ~1% of the actual code but render the whole thing
meaningless if they're left out.

_-_-_-_
thomas @ medical informatics
cambridge university -_-_-_-
_-_-_-_+44 1223 330305


PS could anyone point me in the direction of a g++ Solaris 2.3 binary?

here's the code. it's for making modular arithmetic reasonably
efficient and implements basic things such as multiplication &c.
and is thus concerned (mainly) with overloading the basic
arithmetic operators: 


  inline mersenne&
  operator *=(const mersenne &b)
  {
    unsigned dummy;
    asm("mull %3;addl %1,%0;adcl %4,%0"
        : "=d,a" (value), "=a,d" (dummy)
        : "%a" (value), "rm" (b.value), "ir" (0)
        : "cc");
    return *this;
  }

  inline friend mersenne
  operator *(const mersenne &a, const mersenne &b)
  {
    unsigned r, dummy;
    asm("mull %3;addl %1,%0;adcl %4,%0"
        : "=d,a" (r), "=a,d" (dummy)
        : "%a" (a.value), "rm" (b.value), "ir" (0)
        : "cc");
    return r;
  }
  inline mersenne &
  operator +=(const mersenne &b)
  {
    asm("addl %2,%0;adcl %3,%0"
        : "=r" (value)
        : "%0" (value), "g" (b.value), "ir" (0)
        : "cc");
    return *this;
  }

  inline friend mersenne
  operator +(const mersenne&a, const mersenne&b)
  {
    unsigned r;
    asm("addl %2,%0;adcl %3,%0"
        : "=r" (r)
        : "%0" (value), "g" (b.value), "ir" (0)
        : "cc");
    return r;
  }
  inline mersenne &
  operator -=(const mersenne &b)
  {
    asm("subl %2,%0;sbbl %3,%0"
        : "=r" (value)
        : "0" (value), "g" (b.value), "ir" (0)
        : "cc");
    return *this;
  }

  inline friend mersenne
  operator -(const mersenne &a)
  {
    return ~a.value;
  }

  inline friend mersenne
  operator -(const mersenne&a, const mersenne&b)
  {
    unsigned r;
    asm("subl %2,%0;sbbl %3,%0"
        : "=r" (r)
        : "0" (value), "g" (b.value), "ir" (0)
        : "cc");
    return r;
  }
  inline
  mersenne & operator >>=(unsigned width)
  {
    asm("ror %2,%0"
        : "=g" (value)
        : "0" (value), "ic" ((unsigned char)width)
        : "cc");
    return *this;
  }
  inline friend
  mersenne operator >>(unsigned width)
  {
    unsigned r;
    asm("ror %2,%0"
        : "=g" (r)
        : "0" (value), "ic" ((unsigned char)width)
        : "cc");
    return r;
  }

  inline
  mersenne & operator <<=(unsigned width)
  {
    asm("rol %2,%0"
        : "=g" (value)
        : "0" (value), "ic" ((unsigned char)width)
        : "cc");
    return *this;
  }

  inline friend
  mersenne operator <<(unsigned width)
  {
    unsigned r;
    asm("rol %2,%0"
        : "=g" (r)
        : "0" (value), "ic" ((unsigned char)width)
        : "cc");
    return r;
  }


// next file



  inline modular<modul>&
  operator *=(const modular<modul> &b)
  {
    asm("mull %2;divl %3"
        : "=&d" (value)
        : "%&a" (value), "mr0" (b.value) , "mr" (
        : "%&a" (value), "mr0" (b.value) , "mr" (*modul)
        : "cc");
    return *this;
  }

  inline friend modular<modul>
  operator *(const modular<modul> &a, const modular<modul> &b)
  {
    unsigned r;
    asm("mull %2;divl %3"
        : "=&d" (r)
        : "%&a" (a.value), "mr0" (b.value) , "mr" (*modul)
        : "cc");
    return r;
  }
  inline modular<modul>&
  operator +=(const modular<modul>&b)
  {
    asm("addl %2,%0;jnc 1f;0:subl %3,%0;jnc 0b;1:"
        : "=&r" (value)
        : "%0" (value), "g" (b.value), "ri" (*modul)
        : "cc");
    return *this;
  }

  inline friend modular<modul>
  operator +(const modular<modul>&a, const modular<modul>&b)
  {
    unsigned r;
    asm("addl %2,%0;jnc 1f;0:subl %3,%0;jnc 0b;1:"
        : "=&r" (r)
        : "%0" (a.value), "g" (b.value), "ri" (*modul)
        : "cc");
    return r;
  }
  inline modular<modul>&
  operator -=(const modular<modul>&b)
  {
    asm("subl %2,%0;jnc 1f;0:addl %3,%0;jnc 0b;1:"
        : "=&r" (value)
        : "0" (value), "g" (b.value), "ri" (*modul)
        : "cc");
    return *this;
  }
  inline friend modular<modul>
  operator -(const modular<modul>&a)
  {
    unsigned r;
    asm("negl %0;jnc 1f;0:addl %2,%0;jnc 0b;1:"
        : "=&r" (r)
        : "0" (a.value), "ri" (*modul)
        : "cc");
    return r;
  }

  inline friend modular<modul>
  operator -(const modular<modul>&a, const modular<modul> &b)
  {
    unsigned r;
    asm("subl %2,%0;jnc 1f;0:addl %3,%0;jnc 0b;1:"
        : "=&r" (r)
        : "0" (a.value), "g" (b.value), "ri" (*modul)
        : "cc");
    return r;
  }

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