patch-2.4.4 linux/arch/s390/kernel/floatlib.c

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diff -u --recursive --new-file v2.4.3/linux/arch/s390/kernel/floatlib.c linux/arch/s390/kernel/floatlib.c
@@ -1,1021 +0,0 @@
-/*
-** libgcc support for software floating point.
-** Copyright (C) 1991 by Pipeline Associates, Inc.  All rights reserved.
-** Permission is granted to do *anything* you want with this file,
-** commercial or otherwise, provided this message remains intact.  So there!
-** I would appreciate receiving any updates/patches/changes that anyone
-** makes, and am willing to be the repository for said changes (am I
-** making a big mistake?).
-
-Warning! Only single-precision is actually implemented.  This file
-won't really be much use until double-precision is supported.
-
-However, once that is done, this file might eventually become a
-replacement for libgcc1.c.  It might also make possible
-cross-compilation for an IEEE target machine from a non-IEEE
-host such as a VAX.
-
-If you'd like to work on completing this, please talk to rms@gnu.ai.mit.edu.
-
---> Double precision floating support added by James Carlson on 20 April 1998.
-
-**
-** Pat Wood
-** Pipeline Associates, Inc.
-** pipeline!phw@motown.com or
-** sun!pipeline!phw or
-** uunet!motown!pipeline!phw
-**
-** 05/01/91 -- V1.0 -- first release to gcc mailing lists
-** 05/04/91 -- V1.1 -- added float and double prototypes and return values
-**                  -- fixed problems with adding and subtracting zero
-**                  -- fixed rounding in truncdfsf2
-**                  -- fixed SWAP define and tested on 386
-*/
-
-/*
-** The following are routines that replace the libgcc soft floating point
-** routines that are called automatically when -msoft-float is selected.
-** The support single and double precision IEEE format, with provisions
-** for byte-swapped machines (tested on 386).  Some of the double-precision
-** routines work at full precision, but most of the hard ones simply punt
-** and call the single precision routines, producing a loss of accuracy.
-** long long support is not assumed or included.
-** Overall accuracy is close to IEEE (actually 68882) for single-precision
-** arithmetic.  I think there may still be a 1 in 1000 chance of a bit
-** being rounded the wrong way during a multiply.  I'm not fussy enough to
-** bother with it, but if anyone is, knock yourself out.
-**
-** Efficiency has only been addressed where it was obvious that something
-** would make a big difference.  Anyone who wants to do this right for
-** best speed should go in and rewrite in assembler.
-**
-** I have tested this only on a 68030 workstation and 386/ix integrated
-** in with -msoft-float.
-*/
-
-#define float long
-#define double long long
-
-/* the following deal with IEEE single-precision numbers */
-#define EXCESS          126
-#define SIGNBIT         0x80000000
-#define HIDDEN          (1 << 23)
-#define SIGN(fp)        ((fp) & SIGNBIT)
-#define EXP(fp)         (((fp) >> 23) & 0xFF)
-#define MANT(fp)        (((fp) & 0x7FFFFF) | HIDDEN)
-#define PACK(s,e,m)     ((s) | ((e) << 23) | (m))
-
-/* the following deal with IEEE double-precision numbers */
-#define EXCESSD         1022
-#define HIDDEND         (1 << 20)
-#define EXPD(fp)        (((fp.l.upper) >> 20) & 0x7FF)
-#define SIGND(fp)       ((fp.l.upper) & SIGNBIT)
-#define MANTD(fp)       (((((fp.l.upper) & 0xFFFFF) | HIDDEND) << 10) |(fp.l.lower >> 22))
-#define HIDDEND_LL      ((long long)1 << 52)
-#define MANTD_LL(fp)    ((fp.ll & (HIDDEND_LL-1)) | HIDDEND_LL)
-#define PACKD_LL(s,e,m) (((long long)((s)+((e)<<20))<<32)|(m))
-
-/* define SWAP for 386/960 reverse-byte-order brain-damaged CPUs */
-union double_long {
-    double d;
-#ifdef SWAP
-    struct {
-      unsigned long lower;
-      long upper;
-    } l;
-#else
-    struct {
-      long upper;
-      unsigned long lower;
-    } l;
-#endif
-    long long ll;
-};
-
-union float_long
-  {
-    float f;
-    long l;
-  };
-
-long long
-__negdi2 (long long u)
-{
-
-  union lll {
-    long long ll;
-    long s[2];
-  };
-
-  union lll w,uu;
-
-  uu.ll = u;
-
-  w.s[1] = -uu.s[1];
-  w.s[0] = -uu.s[0] - ((int) w.s[1] != 0);
-
-  return w.ll;
-}
-
-
-
-/* add two floats */
-float
-__addsf3 (float a1, float a2)
-{
-  register long mant1, mant2;
-  register union float_long fl1, fl2;
-  register int exp1, exp2;
-  int sign = 0;
-
-  fl1.f = a1;
-  fl2.f = a2;
-
-  /* check for zero args */
-  if (!fl1.l) {
-      fl1.f = fl2.f;
-      goto test_done;
-  }
-  if (!fl2.l)
-      goto test_done;
-
-  exp1 = EXP (fl1.l);
-  exp2 = EXP (fl2.l);
-
-  if (exp1 > exp2 + 25)
-      goto test_done;
-  if (exp2 > exp1 + 25) {
-      fl1.f = fl2.f;
-      goto test_done;
-  }
-
-  /* do everything in excess precision so's we can round later */
-  mant1 = MANT (fl1.l) << 6;
-  mant2 = MANT (fl2.l) << 6;
-
-  if (SIGN (fl1.l))
-    mant1 = -mant1;
-  if (SIGN (fl2.l))
-    mant2 = -mant2;
-
-  if (exp1 > exp2)
-    {
-      mant2 >>= exp1 - exp2;
-    }
-  else
-    {
-      mant1 >>= exp2 - exp1;
-      exp1 = exp2;
-    }
-  mant1 += mant2;
-
-  if (mant1 < 0)
-    {
-      mant1 = -mant1;
-      sign = SIGNBIT;
-    }
-  else if (!mant1) {
-      fl1.f = 0;
-      goto test_done;
-  }
-
-  /* normalize up */
-  while (!(mant1 & 0xE0000000))
-    {
-      mant1 <<= 1;
-      exp1--;
-    }
-
-  /* normalize down? */
-  if (mant1 & (1 << 30))
-    {
-      mant1 >>= 1;
-      exp1++;
-    }
-
-  /* round to even */
-  mant1 += (mant1 & 0x40) ? 0x20 : 0x1F;
-
-  /* normalize down? */
-  if (mant1 & (1 << 30))
-    {
-      mant1 >>= 1;
-      exp1++;
-    }
-
-  /* lose extra precision */
-  mant1 >>= 6;
-
-  /* turn off hidden bit */
-  mant1 &= ~HIDDEN;
-
-  /* pack up and go home */
-  fl1.l = PACK (sign, exp1, mant1);
-test_done:
-  return (fl1.f);
-}
-
-/* subtract two floats */
-float
-__subsf3 (float a1, float a2)
-{
-  register union float_long fl1, fl2;
-
-  fl1.f = a1;
-  fl2.f = a2;
-
-  /* check for second arg zero */
-  if (!fl2.l)
-    return (fl1.f);
-  /* twiddle sign bit */
-  fl2.l ^= SIGNBIT;
-  /* check for first arg zero */
-  if (!fl1.l)
-    return (fl2.f);
-  /* add values */ 
-  return __addsf3 (a1, fl2.f);
-}
-
-/* compare two floats */
-long
-__cmpsf2 (float a1, float a2)
-{
-  register union float_long fl1, fl2;
-
-  fl1.f = a1;
-  fl2.f = a2;
-
-  if (SIGN (fl1.l) && SIGN (fl2.l))
-    {
-      fl1.l ^= SIGNBIT;
-      fl2.l ^= SIGNBIT;
-      if (fl1.l < fl2.l)
-	return (-1);
-      if (fl1.l > fl2.l)
-	return (1);
-      return 0;
-    } else {
-      if (fl1.l < fl2.l)
-	return (-1);
-      if (fl1.l > fl2.l)
-	return (1);
-      return (0);
-    }
-}
-
-/* multiply two floats */
-float
-__mulsf3 (float a1, float a2)
-{
-  register union float_long fl1, fl2;
-  register unsigned long result;
-  register int exp;
-  int sign;
-
-  fl1.f = a1;
-  fl2.f = a2;
-
-  if (!fl1.l || !fl2.l) {
-      fl1.f = 0;
-      goto test_done;
-  }
-
-  /* compute sign and exponent */
-  sign = SIGN (fl1.l) ^ SIGN (fl2.l);
-  exp = EXP (fl1.l) - EXCESS;
-  exp += EXP (fl2.l);
-
-  fl1.l = MANT (fl1.l);
-  fl2.l = MANT (fl2.l);
-
-  /* the multiply is done as one 16x16 multiply and two 16x8 multiples */
-  result = (fl1.l >> 8) * (fl2.l >> 8);
-  result += ((fl1.l & 0xFF) * (fl2.l >> 8)) >> 8;
-  result += ((fl2.l & 0xFF) * (fl1.l >> 8)) >> 8;
-
-  result >>= 2;
-  if (result & 0x20000000)
-    {
-      /* round */
-      result += 0x20;
-      result >>= 6;
-    }
-  else
-    {
-      /* round */
-      result += 0x10;
-      result >>= 5;
-      exp--;
-    }
-  if (result & (HIDDEN<<1)) {
-    result >>= 1;
-    exp++;
-  }
-
-  result &= ~HIDDEN;
-
-  /* pack up and go home */
-  fl1.l = PACK (sign, exp, result);
-test_done:
-  return (fl1.f);
-}
-
-/* divide two floats */
-float
-__divsf3 (float a1, float a2)
-{
-  register union float_long fl1, fl2;
-  register int result;
-  register int mask;
-  register int exp, sign;
-
-  fl1.f = a1;
-  fl2.f = a2;
-
-  /* subtract exponents */
-  exp = EXP (fl1.l) - EXP (fl2.l) + EXCESS;
-
-  /* compute sign */
-  sign = SIGN (fl1.l) ^ SIGN (fl2.l);
-
-  /* divide by zero??? */
-  if (!fl2.l)
-    /* return NaN or -NaN */
-    return (sign ? 0xFFFFFFFF : 0x7FFFFFFF);
-
-  /* numerator zero??? */
-  if (!fl1.l)
-    return (0);
-
-  /* now get mantissas */
-  fl1.l = MANT (fl1.l);
-  fl2.l = MANT (fl2.l);
-
-  /* this assures we have 25 bits of precision in the end */
-  if (fl1.l < fl2.l)
-    {
-      fl1.l <<= 1;
-      exp--;
-    }
-
-  /* now we perform repeated subtraction of fl2.l from fl1.l */
-  mask = 0x1000000;
-  result = 0;
-  while (mask)
-    {
-      if (fl1.l >= fl2.l)
-        {
-          result |= mask;
-          fl1.l -= fl2.l;
-        }
-      fl1.l <<= 1;
-      mask >>= 1;
-    }
-
-  /* round */
-  result += 1;
-
-  /* normalize down */
-  exp++;
-  result >>= 1;
-
-  result &= ~HIDDEN;
-
-  /* pack up and go home */
-  fl1.l = PACK (sign, exp, result);
-  return (fl1.f);
-}
-
-/* convert double to float */
-float
-__truncdfsf2 (double a1)
-{
-  register int exp;
-  register long mant;
-  register union float_long fl;
-  register union double_long dl1;
-
-  dl1.d = a1;
-
-  if (!dl1.l.upper && !dl1.l.lower)
-    return (float)(0);
-
-  exp = EXPD (dl1) - EXCESSD + EXCESS;
-
-  /* shift double mantissa 6 bits so we can round */
-  mant = MANTD (dl1) >> 6;
-
-  /* now round and shift down */
-  mant += 1;
-  mant >>= 1;
-   
-  /* did the round overflow? */
-  if (mant & 0xFF000000)
-    {
-      mant >>= 1;
-      exp++;
-    }
-
-  mant &= ~HIDDEN;
-
-  /* pack up and go home */
-  fl.l = PACK (SIGND (dl1), exp, mant);
-  return (fl.f);
-}
-
-/* convert int to double */
-double
-__floatsidf (register long a1)
-{
-  register int sign = 0, exp = 31 + EXCESSD;
-  union double_long dl;
-
-  if (a1 == 0x80000000)
-    {
-      /*
-       * -a1 would be 0 !
-       */
-      dl.l.upper = 0xc1e00000;
-      dl.l.lower = 0x0;
-      return (dl.d);
-    }
-
-  if (!a1)
-    {
-      dl.l.upper = dl.l.lower = 0;
-      return (dl.d);
-    }
-
-  if (a1 < 0)
-    {
-      sign = SIGNBIT;
-      a1 = -a1;
-    }
-
-  while (a1 < 0x1000000)
-    {
-      a1 <<= 4;
-      exp -= 4;
-    }
-
-  while (a1 < 0x40000000)
-    {
-      a1 <<= 1;
-      exp--;
-    }
-
-  /* pack up and go home */
-  dl.l.upper = sign;
-  dl.l.upper |= exp << 20;
-  dl.l.upper |= (a1 >> 10) & ~HIDDEND;
-  dl.l.lower = a1 << 22;
-
-  return (dl.d);
-}
-
-double
-__floatdidf (register long long a1)
-{
-    register int exp = 63 + EXCESSD;
-    union double_long dl;
-
-    dl.l.upper = dl.l.lower = 0;
-    if (a1 == 0)
-        return (dl.d);
-
-    if (a1 < 0) {
-        dl.l.upper = SIGNBIT;
-        a1 = -a1;
-    }
-
-    while (a1 < (long long)1<<54) {
-        a1 <<= 8;
-        exp -= 8;
-    }
-    while (a1 < (long long)1<<62) {
-        a1 <<= 1;
-        exp -= 1;
-    }
-  /* pack up and go home */
-    dl.ll |= (a1 >> 10) & ~HIDDEND_LL;
-    dl.l.upper |= exp << 20;
-
-    return (dl.d);
-}
-
-float
-__floatsisf (register long a1)
-{
-    return __truncdfsf2(__floatsidf(a1));
-}
-
-float
-__floatdisf (register long long a1)
-{
-    return (float)__floatdidf(a1);
-}
-/* negate a float */
-float
-__negsf2 (float a1)
-{
-  register union float_long fl1;
-
-  fl1.f = a1;
-  if (!fl1.l)
-    return (0);
-
-  fl1.l ^= SIGNBIT;
-  return (fl1.f);
-}
-
-/* negate a double */
-double
-__negdf2 (double a1)
-{
-  register union double_long dl1;
-
-  dl1.d = a1;
-
-  if (!dl1.l.upper && !dl1.l.lower)
-      return (dl1.d);
-
-  dl1.l.upper ^= SIGNBIT;
-  return (dl1.d);
-}
-
-/* convert float to double */
-double
-__extendsfdf2 (float a1)
-{
-  register union float_long fl1;
-  register union double_long dl;
-  register int exp;
-
-  fl1.f = a1;
-
-  if (!fl1.l)
-    {
-      dl.l.upper = dl.l.lower = 0;
-      return (dl.d);
-    }
-
-  dl.l.upper = SIGN (fl1.l);
-  exp = EXP (fl1.l) - EXCESS + EXCESSD;
-  dl.l.upper |= exp << 20;
-  dl.l.upper |= (MANT (fl1.l) & ~HIDDEN) >> 3;
-  dl.l.lower = MANT (fl1.l) << 29;
-
-  return (dl.d);
-}
-
-
-/* compare two doubles */
-long
-__cmpdf2 (double a1, double a2)
-{
-  register union double_long dl1, dl2;
-
-  dl1.d = a1;
-  dl2.d = a2;
-
-  if (SIGND (dl1) && SIGND (dl2))
-    {
-      dl1.l.upper ^= SIGNBIT;
-      dl2.l.upper ^= SIGNBIT;
-      if (dl1.l.upper < dl2.l.upper)
-	return (1);
-      if (dl1.l.upper > dl2.l.upper)
-	return (-1);
-      if (dl1.l.lower < dl2.l.lower)
-	return (1);
-      if (dl1.l.lower > dl2.l.lower)
-	return (-1);
-      return (0);
-    } else {
-      if (dl1.l.upper < dl2.l.upper)
-	return (-1);
-      if (dl1.l.upper > dl2.l.upper)
-	return (1);
-      if (dl1.l.lower < dl2.l.lower)
-	return (-1);
-      if (dl1.l.lower > dl2.l.lower)
-	return (1);
-      return (0);
-    }
-}
-
-/* convert double to int */
-long
-__fixdfsi (double a1)
-{
-  register union double_long dl1;
-  register int exp;
-  register long l;
-
-  dl1.d = a1;
-
-  if (!dl1.l.upper && !dl1.l.lower)
-    return (0);
-
-  exp = EXPD (dl1) - EXCESSD - 31;
-  l = MANTD (dl1);
-
-  if (exp > 0)
-      return SIGND(dl1) ? (1<<31) : ((1ul<<31)-1);
-
-  /* shift down until exp = 0 or l = 0 */
-  if (exp <= 0 && exp > -32 && l)
-    l >>= -exp;
-  else
-    return (0);
-
-  return (SIGND (dl1) ? -l : l);
-}
-
-/* convert float to int */
-long
-__fixsfsi (float a1)
-{
-    return __fixdfsi(__extendsfdf2(a1));
-}
-
-/* convert double to int */
-long long
-__fixdfdi (double a1)
-{
-    register union double_long dl1;
-    register int exp;
-    register long long l;
-
-    dl1.d = a1;
-
-    if (!dl1.l.upper && !dl1.l.lower)
-        return (0);
-
-    exp = EXPD (dl1) - EXCESSD - 64;
-    l = MANTD_LL(dl1);
-
-    if (exp > 0) {
-        l = (long long)1<<63;
-        if (!SIGND(dl1))
-            l--;
-        return l;
-    }
-
-    /* shift down until exp = 0 or l = 0 */
-    if (exp <= 0 && exp > -64 && l)
-        l >>= -exp;
-    else
-        return (0);
-
-    return (SIGND (dl1) ? -l : l);
-}
-
-/* convert double to unsigned int */
-unsigned long
-__fixunsdfsi (double a1)
-{
-  register union double_long dl1;
-  register int exp;
-  register unsigned long l;
-
-  dl1.d = a1;
-
-  if (!dl1.l.upper && !dl1.l.lower)
-    return (0);
-
-  exp = EXPD (dl1) - EXCESSD - 32;
-  l = (((((dl1.l.upper) & 0xFFFFF) | HIDDEND) << 11) | (dl1.l.lower >> 21));
-
-  if (exp > 0)
-    return (0xFFFFFFFFul);      /* largest integer */
-
-  /* shift down until exp = 0 or l = 0 */
-  if (exp < 0 && exp > -32 && l)
-    l >>= -exp;
-  else
-    return (0);
-
-  return (l);
-}
-
-/* convert double to unsigned int */
-unsigned long long
-__fixunsdfdi (double a1)
-{
-    register union double_long dl1;
-    register int exp;
-    register unsigned long long l;
-
-    dl1.d = a1;
-
-    if (dl1.ll == 0)
-        return (0);
-
-    exp = EXPD (dl1) - EXCESSD - 64;
-
-    l = dl1.ll;
-
-    if (exp > 0)
-        return (unsigned long long)-1;
-
-    /* shift down until exp = 0 or l = 0 */
-    if (exp < 0 && exp > -64 && l)
-        l >>= -exp;
-    else
-        return (0);
-
-    return (l);
-}
-
-/* addtwo doubles */
-double
-__adddf3 (double a1, double a2)
-{
-    register long long mant1, mant2;
-    register union double_long fl1, fl2;
-    register int exp1, exp2;
-    int sign = 0;
-
-    fl1.d = a1;
-    fl2.d = a2;
-
-    /* check for zero args */
-    if (!fl2.ll)
-        goto test_done;
-    if (!fl1.ll) {
-        fl1.d = fl2.d;
-        goto test_done;
-    }
-
-    exp1 = EXPD(fl1);
-    exp2 = EXPD(fl2);
-
-    if (exp1 > exp2 + 54)
-        goto test_done;
-    if (exp2 > exp1 + 54) {
-        fl1.d = fl2.d;
-        goto test_done;
-    }
-
-    /* do everything in excess precision so's we can round later */
-    mant1 = MANTD_LL(fl1) << 9;
-    mant2 = MANTD_LL(fl2) << 9;
-
-    if (SIGND(fl1))
-        mant1 = -mant1;
-    if (SIGND(fl2))
-        mant2 = -mant2;
-
-    if (exp1 > exp2)
-        mant2 >>= exp1 - exp2;
-    else {
-        mant1 >>= exp2 - exp1;
-        exp1 = exp2;
-    }
-    mant1 += mant2;
-
-    if (mant1 < 0) {
-        mant1 = -mant1;
-        sign = SIGNBIT;
-    } else if (!mant1) {
-        fl1.d = 0;
-        goto test_done;
-    }
-
-    /* normalize up */
-    while (!(mant1 & ((long long)7<<61))) {
-        mant1 <<= 1;
-        exp1--;
-    }
-
-    /* normalize down? */
-    if (mant1 & ((long long)3<<62)) {
-        mant1 >>= 1;
-        exp1++;
-    }
-
-    /* round to even */
-    mant1 += (mant1 & (1<<9)) ? (1<<8) : ((1<<8)-1);
-
-    /* normalize down? */
-    if (mant1 & ((long long)3<<62)) {
-        mant1 >>= 1;
-        exp1++;
-    }
-
-    /* lose extra precision */
-    mant1 >>= 9;
-
-    /* turn off hidden bit */
-    mant1 &= ~HIDDEND_LL;
-
-    /* pack up and go home */
-    fl1.ll = PACKD_LL(sign,exp1,mant1);
-
-test_done:
-    return (fl1.d);
-}
-
-/* subtract two doubles */
-double
-__subdf3 (double a1, double a2)
-{
-    register union double_long fl1, fl2;
-
-    fl1.d = a1;
-    fl2.d = a2;
-
-    /* check for zero args */
-    if (!fl2.ll)
-        return (fl1.d);
-    /* twiddle sign bit and add */
-    fl2.l.upper ^= SIGNBIT;
-    if (!fl1.ll)
-        return (fl2.d);
-    return __adddf3 (a1, fl2.d);
-}
-
-/* multiply two doubles */
-double
-__muldf3 (double a1, double a2)
-{
-    register union double_long fl1, fl2;
-    register unsigned long long result=0ULL;
-    register int exp;
-    int sign;
-
-    fl1.d = a1;
-    fl2.d = a2;
-
-    if (!fl1.ll || !fl2.ll) {
-        fl1.d = 0;
-        goto test_done;
-    }
-
-    /* compute sign and exponent */
-    sign = SIGND(fl1) ^ SIGND(fl2);
-    exp = EXPD(fl1) - EXCESSD;
-    exp += EXPD(fl2);
-
-    fl1.ll = MANTD_LL(fl1);
-    fl2.ll = MANTD_LL(fl2);
-
-  /* the multiply is done as one 31x31 multiply and two 31x21 multiples */
-    result = (fl1.ll >> 21) * (fl2.ll >> 21);
-    result += ((fl1.ll & 0x1FFFFF) * (fl2.ll >> 21)) >> 21;
-    result += ((fl2.ll & 0x1FFFFF) * (fl1.ll >> 21)) >> 21;
-
-    result >>= 2;
-    if (result & ((long long)1<<61)) {
-        /* round */
-        result += 1<<8;
-        result >>= 9;
-    } else {
-        /* round */
-        result += 1<<7;
-        result >>= 8;
-        exp--;
-    }
-    if (result & (HIDDEND_LL<<1)) {
-        result >>= 1;
-        exp++;
-    }
-
-    result &= ~HIDDEND_LL;
-
-    /* pack up and go home */
-    fl1.ll = PACKD_LL(sign,exp,result);
-test_done:
-    return (fl1.d);
-}
-
-/* divide two doubles */
-double
-__divdf3 (double a1, double a2)
-{
-    register union double_long fl1, fl2;
-    register long long mask,result;
-    register int exp, sign;
-
-    fl1.d = a1;
-    fl2.d = a2;
-
-    /* subtract exponents */
-    exp = EXPD(fl1) - EXPD(fl2) + EXCESSD;
-
-    /* compute sign */
-    sign = SIGND(fl1) ^ SIGND(fl2);
-
-    /* numerator zero??? */
-    if (fl1.ll == 0) {
-        /* divide by zero??? */
-        if (fl2.ll == 0)
-            fl1.ll = ((unsigned long long)1<<63)-1;     /* NaN */
-        else
-            fl1.ll = 0;
-        goto test_done;
-    }
-
-    /* return +Inf or -Inf */
-    if (fl2.ll == 0) {
-        fl1.ll = PACKD_LL(SIGND(fl1),2047,0);
-        goto test_done;
-    }
-
-
-    /* now get mantissas */
-    fl1.ll = MANTD_LL(fl1);
-    fl2.ll = MANTD_LL(fl2);
-
-    /* this assures we have 54 bits of precision in the end */
-    if (fl1.ll < fl2.ll) {
-        fl1.ll <<= 1;
-        exp--;
-    }
-
-    /* now we perform repeated subtraction of fl2.ll from fl1.ll */
-    mask = (long long)1<<53;
-    result = 0;
-    while (mask) {
-        if (fl1.ll >= fl2.ll)
-        {
-            result |= mask;
-            fl1.ll -= fl2.ll;
-        }
-        fl1.ll <<= 1;
-        mask >>= 1;
-    }
-
-    /* round */
-    result += 1;
-
-    /* normalize down */
-    exp++;
-    result >>= 1;
-
-    result &= ~HIDDEND_LL;
-
-    /* pack up and go home */
-    fl1.ll = PACKD_LL(sign, exp, result);
-
-test_done:
-    return (fl1.d);
-}
-
-int
-__gtdf2 (double a1, double a2)
-{
-    return __cmpdf2 ((float) a1, (float) a2) > 0;
-}
-
-int
-__gedf2 (double a1, double a2)
-{
-    return (__cmpdf2 ((float) a1, (float) a2) >= 0) - 1;
-}
-
-int
-__ltdf2 (double a1, double a2)
-{
-    return - (__cmpdf2 ((float) a1, (float) a2) < 0);
-}
-
-int
-__ledf2 (double a1, double a2)
-{
-    return __cmpdf2 ((float) a1, (float) a2) > 0;
-}
-
-int
-__eqdf2 (double a1, double a2)
-{
-    return *(long long *) &a1 == *(long long *) &a2;
-}
-
-int
-__nedf2 (double a1, double a2)
-{
-    return *(long long *) &a1 != *(long long *) &a2;
-}
-
-/* absolute value of double */
-double
-__absdf2(double a1)
-{
-  if (__cmpdf2(a1,0.0) < 0)
-      return __negdf2(a1);
-  else
-      return a1;
-}
-
-/* absolute value of float */
-float
-__abssf2(float a1)
-{
-  if (__cmpsf2(a1,0.0) < 0)
-      return __negsf2(a1);
-  else
-      return a1;
-}

FUNET's LINUX-ADM group, linux-adm@nic.funet.fi
TCL-scripts by Sam Shen (who was at: slshen@lbl.gov)