/*Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002 Free Software Foundation,Inc.This file is part of the GNU MP Library.The GNU MP Library is free software; you can redistribute it and/or modifyit under the terms of the GNU Lesser General Public License as published bythe Free Software Foundation; either version 2.1 of the License, or (at youroption) any later version.The GNU MP Library is distributed in the hope that it will be useful, butWITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITYor FITNESS FOR A PARTICULAR PURPOSE.  See the GNU Lesser General PublicLicense for more details.You should have received a copy of the GNU Lesser General Public Licensealong with the GNU MP Library; see the file COPYING.LIB.  If not, write tothe Free Software Foundation, Inc., 59 Temple Place - Suite 330, Boston,MA 02111-1307, USA.*/#include <stdio.h>#include "gmp.h"#include "gmp-impl.h"#if defined (USG) || defined (__SVR4) || defined (_UNICOS) || defined (__hpux)#include <time.h>intcputime (){  if (CLOCKS_PER_SEC < 100000)    return clock () * 1000 / CLOCKS_PER_SEC;  return clock () / (CLOCKS_PER_SEC / 1000);}#else#include <sys/types.h>#include <sys/time.h>#include <sys/resource.h>intcputime (){  struct rusage rus;  getrusage (0, &rus);  return rus.ru_utime.tv_sec * 1000 + rus.ru_utime.tv_usec / 1000;}#endif#define M * 1000000#ifndef CLOCK#error "Don't know CLOCK of your machine"#endif#ifndef OPS#define OPS (CLOCK/5)#endif#ifndef SIZE#define SIZE 328#endif#ifndef TIMES#define TIMES OPS/SIZE#else#undef OPS#define OPS (SIZE*TIMES)#endifmp_limb_trefmpn_sub_n (mp_ptr res_ptr,	      mp_srcptr s1_ptr, mp_srcptr s2_ptr, mp_size_t size){  register mp_limb_t x, y, cy;  register mp_size_t j;  /* The loop counter and index J goes from -SIZE to -1.  This way     the loop becomes faster.  */  j = -size;  /* Offset the base pointers to compensate for the negative indices.  */  s1_ptr -= j;  s2_ptr -= j;  res_ptr -= j;  cy = 0;  do    {      y = s2_ptr[j];      x = s1_ptr[j];      y = (y + cy) & GMP_NUMB_MASK;	/* add previous carry to subtrahend */      cy = (y < cy);			/* get out carry from that addition */      y = (x - y) & GMP_NUMB_MASK;	/* main subtract */      cy = (y > x) + cy;		/* get out carry from the subtract, combine */      res_ptr[j] = y;    }  while (++j != 0);  return cy;}main (argc, argv)     int argc;     char **argv;{  mp_limb_t s1[SIZE];  mp_limb_t s2[SIZE];  mp_limb_t dx[SIZE+2];  mp_limb_t dy[SIZE+2];  int cyx, cyy;  int i;  long t0, t;  unsigned int test;  mp_size_t size;  unsigned int ntests;  ntests = ~(unsigned) 0;  if (argc == 2)    ntests = strtol (argv[1], 0, 0);  for (test = 1; test <= ntests; test++)    {#if TIMES == 1 && ! defined (PRINT)      if (test % (SIZE > 10000 ? 1 : 10000 / SIZE) == 0)	{	  printf ("\r%d", test);	  fflush (stdout);	}#endif#ifdef RANDOM      size = random () % SIZE + 1;#else      size = SIZE;#endif      dx[0] = 0x87654321;      dy[0] = 0x87654321;      dx[size+1] = 0x12345678;      dy[size+1] = 0x12345678;#if TIMES != 1      mpn_random (s1, size);      mpn_random (s2, size);#ifndef NOCHECK      t0 = cputime();      for (i = 0; i < TIMES; i++)	refmpn_sub_n (dx+1, s1, s2, size);      t = cputime() - t0;      printf ("refmpn_sub_n: %5ldms (%.2f cycles/limb)\n",	      t, ((double) t * CLOCK) / (OPS * 1000.0));#endif      t0 = cputime();      for (i = 0; i < TIMES; i++)	mpn_sub_n (dx+1, s1, s2, size);      t = cputime() - t0;      printf ("mpn_sub_n:    %5ldms (%.2f cycles/limb)\n",	      t, ((double) t * CLOCK) / (OPS * 1000.0));#endif#ifndef NOCHECK      mpn_random2 (s1, size);      mpn_random2 (s2, size);#ifdef PRINT      mpn_print (s1, size);      mpn_print (s2, size);#endif      /* Put garbage in the destination.  */      for (i = 0; i < size; i++)	{	  dx[i+1] = 0xdead;	  dy[i+1] = 0xbeef;	}      cyx = refmpn_sub_n (dx+1, s1, s2, size);      cyy = mpn_sub_n (dy+1, s1, s2, size);#ifdef PRINT      printf ("%d ", cyx); mpn_print (dx+1, size);      printf ("%d ", cyy); mpn_print (dy+1, size);#endif      if (cyx != cyy || mpn_cmp (dx, dy, size+2) != 0	  || dx[0] != 0x87654321 || dx[size+1] != 0x12345678)	{#ifndef PRINT	  printf ("%d ", cyx); mpn_print (dx+1, size);	  printf ("%d ", cyy); mpn_print (dy+1, size);#endif	  printf ("\n");	  if (dy[0] != 0x87654321)	    printf ("clobbered at low end\n");	  if (dy[size+1] != 0x12345678)	    printf ("clobbered at high end\n");	  printf ("TEST NUMBER %u\n", test);	  abort();	}#endif    }}mpn_print (mp_ptr p, mp_size_t size){  mp_size_t i;  for (i = size - 1; i >= 0; i--)    {#ifdef _LONG_LONG_LIMB      printf ("%0*lX%0*lX", (int) (sizeof(mp_limb_t)),	      (unsigned long) (p[i] >> (BITS_PER_MP_LIMB/2)),              (int) (sizeof(mp_limb_t)), (unsigned long) (p[i]));#else      printf ("%0*lX", (int) (2 * sizeof(mp_limb_t)), p[i]);#endif#ifdef SPACE      if (i != 0)	printf (" ");#endif    }  puts ("");}