ftp.nice.ch/pub/next/developer/languages/lisp/AKCL.1.599.s.tar.gz#/akcl-1-599/mp/mp_addmul.c

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#include "include.h"
#include "arith.h"  
/*
   (h = hiremainder, y = addmul(a,b), hiremainder:y == a*b + h) is true
*/

int addmul(x,y)
     ulong x,y;
{
  ulong xlo,xhi,ylo,yhi;
  ulong z,z2; TEMPVARS

  xlo=x&65535;xhi=x>>16;ylo=y&65535;yhi=y>>16;
  z=addll(xlo*yhi,xhi*ylo);
  z2=(overflow)?xhi*yhi+65536+(z>>16):xhi*yhi+(z>>16);
  z=addll(xlo*ylo,(z<<16));z2+=overflow;
  z=addll(z,hiremainder);hiremainder=z2+overflow;
  return z;
}

These are the contents of the former NiCE NeXT User Group NeXTSTEP/OpenStep software archive, currently hosted by Netfuture.ch.