path: root/gcc-1.40/gnulib2.c

/* More subroutines needed by GCC output code on some machines.  */
/* Compile this one with gcc.  */

#include "config.h"
#include <stddef.h>

#ifndef SItype
#define SItype long int
#endif

/* long long ints are pairs of long ints in the order determined by
   WORDS_BIG_ENDIAN.  */

#ifdef WORDS_BIG_ENDIAN
  struct longlong {long high, low;};
#else
  struct longlong {long low, high;};
#endif

/* We need this union to unpack/pack longlongs, since we don't have
   any arithmetic yet.  Incoming long long parameters are stored
   into the `ll' field, and the unpacked result is read from the struct
   longlong.  */

typedef union
{
  struct longlong s;
  long long ll;
  SItype i[2];
  unsigned SItype ui[2];
} long_long;

/* Internally, long long ints are strings of unsigned shorts in the
   order determined by BYTES_BIG_ENDIAN.  */

#define B 0x10000
#define low16 (B - 1)

#ifdef BYTES_BIG_ENDIAN

/* Note that HIGH and LOW do not describe the order
   of words in a long long.  They describe the order of words
   in vectors ordered according to the byte order.  */

#define HIGH 0
#define LOW 1

#define big_end(n)	0 
#define little_end(n)	((n) - 1)
#define next_msd(i)	((i) - 1)
#define next_lsd(i)	((i) + 1)
#define is_not_msd(i,n)	((i) >= 0)
#define is_not_lsd(i,n)	((i) < (n))

#else

#define LOW 0
#define HIGH 1

#define big_end(n)	((n) - 1)
#define little_end(n)	0 
#define next_msd(i)	((i) + 1)
#define next_lsd(i)	((i) - 1)
#define is_not_msd(i,n)	((i) < (n))
#define is_not_lsd(i,n)	((i) >= 0)

#endif

/* These algorithms are all straight out of Knuth, vol. 2, sec. 4.3.1. */

static int badd ();
static int bsub ();
static void bmul ();
static int bneg ();
static int bshift ();

#ifdef L_adddi3
long long 
__adddi3 (u, v)
     long long u, v;
{
  long a[2], b[2], c[2];
  long_long w;
  long_long uu, vv;

  uu.ll = u;
  vv.ll = v;

  a[HIGH] = uu.s.high;
  a[LOW] = uu.s.low;
  b[HIGH] = vv.s.high;
  b[LOW] = vv.s.low;

  badd (a, b, c, sizeof c);

  w.s.high = c[HIGH];
  w.s.low = c[LOW];
  return w.ll;
}

static int 
badd (a, b, c, n)
     unsigned short *a, *b, *c;
     size_t n;
{
  unsigned long acc;
  int i;

  n /= sizeof *c;

  acc = 0;
  for (i = little_end (n); is_not_msd (i, n); i = next_msd (i))
    {
      /* Widen before adding to avoid loss of high bits.  */
      acc += (unsigned long) a[i] + b[i];
      c[i] = acc & low16;
      acc = acc >> 16;
    }
  return acc;
}
#endif

#ifdef L_anddi3
long long 
__anddi3 (u, v)
     long long u, v;
{
  long_long w;
  long_long uu, vv;

  uu.ll = u;
  vv.ll = v;

  w.s.high = uu.s.high & vv.s.high;
  w.s.low = uu.s.low & vv.s.low;

  return w.ll;
}
#endif

#ifdef L_iordi3
long long 
__iordi3 (u, v)
     long long u, v;
{
  long_long w;
  long_long uu, vv;

  uu.ll = u;
  vv.ll = v;

  w.s.high = uu.s.high | vv.s.high;
  w.s.low = uu.s.low | vv.s.low;

  return w.ll;
}
#endif

#ifdef L_xordi3
long long 
__xordi3 (u, v)
     long long u, v;
{
  long_long w;
  long_long uu, vv;

  uu.ll = u;
  vv.ll = v;

  w.s.high = uu.s.high ^ vv.s.high;
  w.s.low = uu.s.low ^ vv.s.low;

  return w.ll;
}
#endif

#ifdef L_one_cmpldi2
long long
__one_cmpldi2 (u)
     long long u;
{
  long_long w;
  long_long uu;

  uu.ll = u;

  w.s.high = ~uu.s.high;
  w.s.low = ~uu.s.low;

  return w.ll;
}
#endif

#ifdef L_lshldi3
long long
__lshldi3 (u, b1)
     long long u;
     long long b1;
{
  long_long w;
  unsigned long carries;
  int bm;
  long_long uu;
  int b = b1;

  if (b == 0)
    return u;

  uu.ll = u;

  bm = (sizeof (int) * BITS_PER_UNIT) - b;
  if (bm <= 0)
    {
      w.s.low = 0;
      w.s.high = (unsigned long)uu.s.low << -bm;
    }
  else
    {
      carries = (unsigned long)uu.s.low >> bm;
      w.s.low = (unsigned long)uu.s.low << b;
      w.s.high = ((unsigned long)uu.s.high << b) | carries;
    }

  return w.ll;
}
#endif

#ifdef L_lshrdi3
long long
__lshrdi3 (u, b1)
     long long u;
     long long b1;
{
  long_long w;
  unsigned long carries;
  int bm;
  long_long uu;
  int b = b1;

  if (b == 0)
    return u;

  uu.ll = u;

  bm = (sizeof (int) * BITS_PER_UNIT) - b;
  if (bm <= 0)
    {
      w.s.high = 0;
      w.s.low = (unsigned long)uu.s.high >> -bm;
    }
  else
    {
      carries = (unsigned long)uu.s.high << bm;
      w.s.high = (unsigned long)uu.s.high >> b;
      w.s.low = ((unsigned long)uu.s.low >> b) | carries;
    }

  return w.ll;
}
#endif

#ifdef L_ashldi3
long long
__ashldi3 (u, b1)
     long long u;
     long long b1;
{
  long_long w;
  unsigned long carries;
  int bm;
  long_long uu;
  int b = b1;

  if (b == 0)
    return u;

  uu.ll = u;

  bm = (sizeof (int) * BITS_PER_UNIT) - b;
  if (bm <= 0)
    {
      w.s.low = 0;
      w.s.high = (unsigned long)uu.s.low << -bm;
    }
  else
    {
      carries = (unsigned long)uu.s.low >> bm;
      w.s.low = (unsigned long)uu.s.low << b;
      w.s.high = ((unsigned long)uu.s.high << b) | carries;
    }

  return w.ll;
}
#endif

#ifdef L_ashrdi3
long long
__ashrdi3 (u, b1)
     long long u;
     long long b1;
{
  long_long w;
  unsigned long carries;
  int bm;
  long_long uu;
  int b = b1;

  if (b == 0)
    return u;

  uu.ll = u;

  bm = (sizeof (int) * BITS_PER_UNIT) - b;
  if (bm <= 0)
    {
      w.s.high = uu.s.high >> 31; /* just to make w.s.high 1..1 or 0..0 */
      w.s.low = uu.s.high >> -bm;
    }
  else
    {
      carries = (unsigned long)uu.s.high << bm;
      w.s.high = uu.s.high >> b;
      w.s.low = ((unsigned long)uu.s.low >> b) | carries;
    }

  return w.ll;
}
#endif

#ifdef L_subdi3
long long 
__subdi3 (u, v)
     long long u, v;
{
  long a[2], b[2], c[2];
  long_long w;
  long_long uu, vv;

  uu.ll = u;
  vv.ll = v;

  a[HIGH] = uu.s.high;
  a[LOW] = uu.s.low;
  b[HIGH] = vv.s.high;
  b[LOW] = vv.s.low;

  bsub (a, b, c, sizeof c);

  w.s.high = c[HIGH];
  w.s.low = c[LOW];
  return w.ll;
}

static int 
bsub (a, b, c, n)
     unsigned short *a, *b, *c;
     size_t n;
{
  signed long acc;
  int i;

  n /= sizeof *c;

  acc = 0;
  for (i = little_end (n); is_not_msd (i, n); i = next_msd (i))
    {
      /* Widen before subtracting to avoid loss of high bits.  */
      acc += (long) a[i] - b[i];
      c[i] = acc & low16;
      acc = acc >> 16;
    }
  return acc;
}
#endif

#ifdef L_muldi3
long long 
__muldi3 (u, v)
     long long u, v;
{
  long a[2], b[2], c[2][2];
  long_long w;
  long_long uu, vv;

  uu.ll = u;
  vv.ll = v;

  a[HIGH] = uu.s.high;
  a[LOW] = uu.s.low;
  b[HIGH] = vv.s.high;
  b[LOW] = vv.s.low;

  bmul (a, b, c, sizeof a, sizeof b);

  w.s.high = c[LOW][HIGH];
  w.s.low = c[LOW][LOW];
  return w.ll;
}

static void 
bmul (a, b, c, m, n)
    unsigned short *a, *b, *c;
    size_t m, n;
{
  int i, j;
  unsigned long acc;

  bzero (c, m + n);

  m /= sizeof *a;
  n /= sizeof *b;

  for (j = little_end (n); is_not_msd (j, n); j = next_msd (j))
    {
      unsigned short *c1 = c + j + little_end (2);
      acc = 0;
      for (i = little_end (m); is_not_msd (i, m); i = next_msd (i))
	{
	  /* Widen before arithmetic to avoid loss of high bits.  */
	  acc += (unsigned long) a[i] * b[j] + c1[i];
	  c1[i] = acc & low16;
	  acc = acc >> 16;
	}
      c1[i] = acc;
    }
}
#endif

#ifdef L_divdi3
long long
__divdi3 (u, v)
     long long u, v;
{
  if (u < 0)
    if (v < 0)
      return (unsigned long long) -u / (unsigned long long) -v;
    else
      return - ((unsigned long long) -u / (unsigned long long) v);
  else
    if (v < 0)
      return - ((unsigned long long) u / (unsigned long long) -v);
    else
      return (unsigned long long) u / (unsigned long long) v;
}
#endif

#ifdef L_moddi3
long long
__moddi3 (u, v)
     long long u, v;
{
  if (u < 0)
    if (v < 0)
      return - ((unsigned long long) -u % (unsigned long long) -v);
    else
      return - ((unsigned long long) -u % (unsigned long long) v);
  else
    if (v < 0)
      return (unsigned long long) u % (unsigned long long) -v;
    else
      return (unsigned long long) u % (unsigned long long) v;
}
#endif

#ifdef L_udivdi3
long long 
__udivdi3 (u, v)
     long long u, v;
{
  unsigned long a[2][2], b[2], q[2], r[2];
  long_long w;
  long_long uu, vv;

  uu.ll = u;
  vv.ll = v;

  a[HIGH][HIGH] = 0;
  a[HIGH][LOW] = 0;
  a[LOW][HIGH] = uu.s.high;
  a[LOW][LOW] = uu.s.low;
  b[HIGH] = vv.s.high;
  b[LOW] = vv.s.low;

  __bdiv (a, b, q, r, sizeof a, sizeof b);

  w.s.high = q[HIGH];
  w.s.low = q[LOW];
  return w.ll;
}
#endif

#ifdef L_umoddi3
long long 
__umoddi3 (u, v)
     long long u, v;
{
  unsigned long a[2][2], b[2], q[2], r[2];
  long_long w;
  long_long uu, vv;

  uu.ll = u;
  vv.ll = v;

  a[HIGH][HIGH] = 0;
  a[HIGH][LOW] = 0;
  a[LOW][HIGH] = uu.s.high;
  a[LOW][LOW] = uu.s.low;
  b[HIGH] = vv.s.high;
  b[LOW] = vv.s.low;

  __bdiv (a, b, q, r, sizeof a, sizeof b);

  w.s.high = r[HIGH];
  w.s.low = r[LOW];
  return w.ll;
}
#endif

#ifdef L_negdi2
long long 
__negdi2 (u)
     long long u;
{
  unsigned long a[2], b[2];
  long_long w;
  long_long uu;

  uu.ll = u;

  a[HIGH] = uu.s.high;
  a[LOW] = uu.s.low;

  bneg (a, b, sizeof b);

  w.s.high = b[HIGH];
  w.s.low = b[LOW];
  return w.ll;
}

static int
bneg (a, b, n)
     unsigned short *a, *b;
     size_t n;
{
  signed long acc;
  int i;

  n /= sizeof (short);

  acc = 0;
  for (i = little_end (n); is_not_msd (i, n); i = next_msd (i))
    {
      acc -= a[i];
      b[i] = acc & low16;
      acc = acc >> 16;
    }
  return acc;
}
#endif

/* Divide a by b, producing quotient q and remainder r.

       sizeof a is m
       sizeof b is n
       sizeof q is m - n
       sizeof r is n

   The quotient must fit in m - n bytes, i.e., the most significant
   n digits of a must be less than b, and m must be greater than n.  */

/* The name of this used to be __div_internal,
   but that is too long for SYSV.  */

#ifdef L_bdiv
void 
__bdiv (a, b, q, r, m, n)
     unsigned short *a, *b, *q, *r;
     size_t m, n;
{
  unsigned long qhat, rhat;
  unsigned long acc;
  unsigned short *u = (unsigned short *) alloca (m);
  unsigned short *v = (unsigned short *) alloca (n);
  unsigned short *u0, *u1, *u2;
  unsigned short *v0;
  int d, qn;
  int i, j;

  m /= sizeof *a;
  n /= sizeof *b;
  qn = m - n;

  /* Remove leading zero digits from divisor, and the same number of
     digits (which must be zero) from dividend.  */

  while (b[big_end (n)] == 0)
    {
      r[big_end (n)] = 0;

      a += little_end (2);
      b += little_end (2);
      r += little_end (2);
      m--;
      n--;

      /* Check for zero divisor.  */
      if (n == 0)
	abort ();
    }
      
  /* If divisor is a single digit, do short division.  */

  if (n == 1)
    {
      acc = a[big_end (m)];
      a += little_end (2);
      for (j = big_end (qn); is_not_lsd (j, qn); j = next_lsd (j))
	{
	  acc = (acc << 16) | a[j];
	  q[j] = acc / *b;
	  acc = acc % *b;
	}
      *r = acc;
      return;
    }

  /* No such luck, must do long division. Shift divisor and dividend
     left until the high bit of the divisor is 1.  */

  for (d = 0; d < 16; d++)
    if (b[big_end (n)] & (1 << (16 - 1 - d)))
      break;

  bshift (a, d, u, 0, m);
  bshift (b, d, v, 0, n);

  /* Get pointers to the high dividend and divisor digits.  */

  u0 = u + big_end (m) - big_end (qn);
  u1 = next_lsd (u0);
  u2 = next_lsd (u1);
  u += little_end (2);

  v0 = v + big_end (n);

  /* Main loop: find a quotient digit, multiply it by the divisor,
     and subtract that from the dividend, shifted over the right amount. */

  for (j = big_end (qn); is_not_lsd (j, qn); j = next_lsd (j))
    {
      /* Quotient digit initial guess: high 2 dividend digits over high
	 divisor digit.  */

      if (u0[j] == *v0)
	{
	  qhat = B - 1;
	  rhat = (unsigned long) *v0 + u1[j];
	}
      else
	{
	  unsigned long numerator = ((unsigned long) u0[j] << 16) | u1[j];
	  qhat = numerator / *v0;
	  rhat = numerator % *v0;
	}

      /* Now get the quotient right for high 3 dividend digits over
	 high 2 divisor digits.  */

      while (rhat < B && qhat * *next_lsd (v0) > ((rhat << 16) | u2[j]))
	{
	  qhat -= 1;
	  rhat += *v0;
	}
	    
      /* Multiply quotient by divisor, subtract from dividend.  */

      acc = 0;
      for (i = little_end (n); is_not_msd (i, n); i = next_msd (i))
	{
	  acc += (unsigned long) (u + j)[i] - v[i] * qhat;
	  (u + j)[i] = acc & low16;
	  if (acc < B)
	    acc = 0;
	  else
	    acc = (acc >> 16) | -B;
	}

      q[j] = qhat;

      /* Quotient may have been too high by 1.  If dividend went negative,
	 decrement the quotient by 1 and add the divisor back.  */

      if ((signed long) (acc + u0[j]) < 0)
	{
	  q[j] -= 1;
	  acc = 0;
	  for (i = little_end (n); is_not_msd (i, n); i = next_msd (i))
	    {
	      acc += (unsigned long) (u + j)[i] + v[i];
	      (u + j)[i] = acc & low16;
	      acc = acc >> 16;
	    }
	}
    }

  /* Now the remainder is what's left of the dividend, shifted right
     by the amount of the normalizing left shift at the top.  */

  r[big_end (n)] = bshift (u + 1 + little_end (j - 1),
			   16 - d,
			   r + little_end (2),
			   u[little_end (m - 1)] >> d,
			   n - 1);
}

/* Left shift U by K giving W; fill the introduced low-order bits with
   CARRY_IN.  Length of U and W is N.  Return carry out.  K must be
   in 0 .. 16.  */

static int
bshift (u, k, w, carry_in, n)
     unsigned short *u, *w, carry_in;
     int k, n;
{
  unsigned long acc;
  int i;

  if (k == 0)
    {
      bcopy (u, w, n * sizeof *u);
      return 0;
    }

  acc = carry_in;
  for (i = little_end (n); is_not_msd (i, n); i = next_msd (i))
    {
      acc |= (unsigned long) u[i] << k;
      w[i] = acc & low16;
      acc = acc >> 16;
    }
  return acc;
}
#endif

#ifdef L_cmpdi2
SItype
__cmpdi2 (a, b)
     long long a, b;
{
  long_long au, bu;

  au.ll = a, bu.ll = b;

  if (au.s.high < bu.s.high)
    return 0;
  else if (au.s.high > bu.s.high)
    return 2;
  if ((unsigned) au.s.low < (unsigned) bu.s.low)
    return 0;
  else if ((unsigned) au.s.low > (unsigned) bu.s.low)
    return 2;
  return 1;
}
#endif

#ifdef L_ucmpdi2
SItype
__ucmpdi2 (a, b)
     long long a, b;
{
  long_long au, bu;

  au.ll = a, bu.ll = b;

  if ((unsigned) au.s.high < (unsigned) bu.s.high)
    return 0;
  else if ((unsigned) au.s.high > (unsigned) bu.s.high)
    return 2;
  if ((unsigned) au.s.low < (unsigned) bu.s.low)
    return 0;
  else if ((unsigned) au.s.low > (unsigned) bu.s.low)
    return 2;
  return 1;
}
#endif

#ifdef L_fixunsdfdi
#define HIGH_WORD_COEFF (((long long) 1) << BITS_PER_WORD)

long long
__fixunsdfdi (a)
     double a;
{
  double b;
  unsigned long long v;

  if (a < 0)
    return 0;

  /* Compute high word of result, as a flonum.  */
  b = (a / HIGH_WORD_COEFF);
  /* Convert that to fixed (but not to long long!),
     and shift it into the high word.  */
  v = (unsigned long int) b;
  v <<= BITS_PER_WORD;
  /* Remove high part from the double, leaving the low part as flonum.  */
  a -= (double)v;
  /* Convert that to fixed (but not to long long!) and add it in.
     Sometimes A comes out negative.  This is significant, since
     A has more bits than a long int does.  */
  if (a < 0)
    v -= (unsigned long int) (- a);
  else
    v += (unsigned long int) a;
  return v;
}
#endif

#ifdef L_fixdfdi
long long
__fixdfdi (a)
     double a;
{
  long long __fixunsdfdi (double a);

  if (a < 0)
    return - __fixunsdfdi (-a);
  return __fixunsdfdi (a);
}
#endif

#ifdef L_floatdidf
#define HIGH_HALFWORD_COEFF (((long long) 1) << (BITS_PER_WORD / 2))
#define HIGH_WORD_COEFF (((long long) 1) << BITS_PER_WORD)

double
__floatdidf (u)
     long long u;
{
  double d;
  int negate = 0;

  if (u < 0)
    u = -u, negate = 1;

  d = (unsigned int) (u >> BITS_PER_WORD);
  d *= HIGH_HALFWORD_COEFF;
  d *= HIGH_HALFWORD_COEFF;
  d += (unsigned int) (u & (HIGH_WORD_COEFF - 1));

  return (negate ? -d : d);
}
#endif

#ifdef L_varargs
#ifdef i860
	asm ("	.text");
	asm ("	.align	4");

	asm ("___builtin_saveregs::");
	asm ("	mov	sp,r30");
	asm ("	andnot	0x0f,sp,sp");
	asm ("	adds	-96,sp,sp");  /* allocate sufficient space on the stack */

	asm ("	st.l	r16, 0(sp)"); /* save integer regs (r16-r27) */
	asm ("	st.l	r17, 4(sp)"); /* int	fixed[12] */
	asm ("	st.l	r18, 8(sp)");
	asm ("	st.l	r19,12(sp)");
	asm ("	st.l	r20,16(sp)");
	asm ("	st.l	r21,20(sp)");
	asm ("	st.l	r22,24(sp)");
	asm ("	st.l	r23,28(sp)");
	asm ("	st.l	r24,32(sp)");
	asm ("	st.l	r25,36(sp)");
	asm ("	st.l	r26,40(sp)");
	asm ("	st.l	r27,44(sp)");

	asm ("	fst.q	f8, 48(sp)"); /* save floating regs (f8-f15) */
	asm ("	fst.q	f12,64(sp)"); /* int floating[8] */

	asm ("	st.l	r28,80(sp)"); /* pointer to more args */
	asm ("	st.l	r0, 84(sp)"); /* nfixed */
	asm ("	st.l	r0, 88(sp)"); /* nfloating */
	asm ("	st.l	r0, 92(sp)"); /* pad */

	asm ("	mov	sp,r16");
	asm ("	bri	r1");
	asm ("	mov	r30,sp");
				/* recover stack and pass address to start 
				   of data.  */
#endif
#ifdef sparc
	asm (".global ___builtin_saveregs");
	asm ("___builtin_saveregs:");
	asm ("st %i0,[%fp+68]");
	asm ("st %i1,[%fp+72]");
	asm ("st %i2,[%fp+76]");
	asm ("st %i3,[%fp+80]");
	asm ("st %i4,[%fp+84]");
	asm ("retl");
	asm ("st %i5,[%fp+88]");
#else /* not sparc */
#if defined(MIPSEL) | defined(R3000) | defined(R2000) | defined(mips)

  asm ("	.text");
  asm ("	.ent __builtin_saveregs");
  asm ("	.globl __builtin_saveregs");
  asm ("__builtin_saveregs:");
  asm ("	sw	$4,0($30)");
  asm ("	sw	$5,4($30)");
  asm ("	sw	$6,8($30)");
  asm ("	sw	$7,12($30)");
  asm ("	j	$31");
  asm ("	.end __builtin_saveregs");
#else /* not mips */
__builtin_saveregs ()
{
  abort ();
}
#endif /* not mips */
#endif /* not sparc */
#endif