xref: /openbsd/gnu/gcc/gcc/config/s390/fixdfdi.h (revision 404b540a)

/* Definitions of target machine for GNU compiler, for IBM S/390
   Copyright (C) 1999, 2000, 2001 Free Software Foundation, Inc.
   Contributed by Hartmut Penner (hpenner@de.ibm.com) and
                  Ulrich Weigand (uweigand@de.ibm.com).

This file is part of GCC.

GCC is free software; you can redistribute it and/or modify it under
the terms of the GNU General Public License as published by the Free
Software Foundation; either version 2, or (at your option) any later
version.

GCC is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or
FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
for more details.

You should have received a copy of the GNU General Public License
along with GCC; see the file COPYING.  If not, write to the Free
Software Foundation, 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301, USA.  */

#ifdef L_fixunstfdi

#define EXPD(fp)	   (((fp.l.i[0]) >> 16) & 0x7FFF)
#define EXPONENT_BIAS	   16383
#define MANTISSA_BITS      112
#define PRECISION          (MANTISSA_BITS + 1)
#define SIGNBIT		   0x80000000
#define SIGND(fp)	   ((fp.l.i[0]) & SIGNBIT)
#define MANTD_HIGH_LL(fp)  ((fp.ll[0] & HIGH_LL_FRAC_MASK) | HIGH_LL_UNIT_BIT)
#define MANTD_LOW_LL(fp)   (fp.ll[1])
#define FRACD_ZERO_P(fp)   (!fp.ll[1] && !(fp.ll[0] & HIGH_LL_FRAC_MASK))
#define HIGH_LL_FRAC_BITS  48
#define HIGH_LL_UNIT_BIT   ((UDItype_x)1 << HIGH_LL_FRAC_BITS)
#define HIGH_LL_FRAC_MASK  (HIGH_LL_UNIT_BIT - 1)

typedef int DItype_x __attribute__ ((mode (DI)));
typedef unsigned int UDItype_x __attribute__ ((mode (DI)));
typedef int SItype_x __attribute__ ((mode (SI)));
typedef unsigned int USItype_x __attribute__ ((mode (SI)));

union double_long {
  long double d;
  struct {
      SItype_x i[4]; /* 32 bit parts: 0 upper ... 3 lowest */
    } l;
  UDItype_x ll[2];   /* 64 bit parts: 0 upper, 1 lower */
};

UDItype_x __fixunstfdi (long double a1);

/* convert double to unsigned int */
UDItype_x
__fixunstfdi (long double a1)
{
    register union double_long dl1;
    register int exp;
    register UDItype_x l;

    dl1.d = a1;

    /* +/- 0, denormalized, negative */
    if (!EXPD (dl1) || SIGND(dl1))
      return 0;

    /* The exponent - considered the binary point at the right end of
       the mantissa.  */
    exp = EXPD (dl1) - EXPONENT_BIAS - MANTISSA_BITS;

    /* number < 1: If the mantissa would need to be right-shifted more bits than
       its size (plus the implied one bit on the left) the result would be
       zero.  */
    if (exp <= -PRECISION)
      return 0;

    /* NaN: All exponent bits set and a nonzero fraction.  */
    if ((EXPD(dl1) == 0x7fff) && !FRACD_ZERO_P (dl1))
      return 0x0ULL;

    /* If the upper ll part of the mantissa isn't
       zeroed out after shifting the number would be to large.  */
    if (exp >= -HIGH_LL_FRAC_BITS)
      return 0xFFFFFFFFFFFFFFFFULL;

    exp += HIGH_LL_FRAC_BITS + 1;

    l = MANTD_LOW_LL (dl1) >> (HIGH_LL_FRAC_BITS + 1)
        | MANTD_HIGH_LL (dl1) << (64 - (HIGH_LL_FRAC_BITS + 1));

    return l >> -exp;
}
#define __fixunstfdi ___fixunstfdi
#endif
#undef L_fixunstfdi

#ifdef L_fixtfdi
#define EXPD(fp)	   (((fp.l.i[0]) >> 16) & 0x7FFF)
#define EXPONENT_BIAS	   16383
#define MANTISSA_BITS      112
#define PRECISION          (MANTISSA_BITS + 1)
#define SIGNBIT		   0x80000000
#define SIGND(fp)	   ((fp.l.i[0]) & SIGNBIT)
#define MANTD_HIGH_LL(fp)  ((fp.ll[0] & HIGH_LL_FRAC_MASK) | HIGH_LL_UNIT_BIT)
#define MANTD_LOW_LL(fp)   (fp.ll[1])
#define FRACD_ZERO_P(fp)   (!fp.ll[1] && !(fp.ll[0] & HIGH_LL_FRAC_MASK))
#define HIGH_LL_FRAC_BITS  48
#define HIGH_LL_UNIT_BIT   ((UDItype_x)1 << HIGH_LL_FRAC_BITS)
#define HIGH_LL_FRAC_MASK  (HIGH_LL_UNIT_BIT - 1)

typedef int DItype_x __attribute__ ((mode (DI)));
typedef unsigned int UDItype_x __attribute__ ((mode (DI)));
typedef int SItype_x __attribute__ ((mode (SI)));
typedef unsigned int USItype_x __attribute__ ((mode (SI)));

union double_long {
  long double d;
  struct {
      SItype_x i[4]; /* 32 bit parts: 0 upper ... 3 lowest */
    } l;
  DItype_x ll[2];   /* 64 bit parts: 0 upper, 1 lower */
};

DItype_x __fixtfdi (long double a1);

/* convert double to unsigned int */
DItype_x
__fixtfdi (long double a1)
{
    register union double_long dl1;
    register int exp;
    register UDItype_x l;

    dl1.d = a1;

    /* +/- 0, denormalized */
    if (!EXPD (dl1))
      return 0;

    /* The exponent - considered the binary point at the right end of
       the mantissa.  */
    exp = EXPD (dl1) - EXPONENT_BIAS - MANTISSA_BITS;

    /* number < 1: If the mantissa would need to be right-shifted more bits than
       its size the result would be zero.  */
    if (exp <= -PRECISION)
      return 0;

    /* NaN: All exponent bits set and a nonzero fraction.  */
    if ((EXPD(dl1) == 0x7fff) && !FRACD_ZERO_P (dl1))
      return 0x8000000000000000ULL;

    /* If the upper ll part of the mantissa isn't
       zeroed out after shifting the number would be to large.  */
    if (exp >= -HIGH_LL_FRAC_BITS)
      {
	l = (long long)1 << 63; /* long int min */
	return SIGND (dl1) ? l : l - 1;
      }

    /* The extra bit is needed for the sign bit.  */
    exp += HIGH_LL_FRAC_BITS + 1;

    l = MANTD_LOW_LL (dl1) >> (HIGH_LL_FRAC_BITS + 1)
        | MANTD_HIGH_LL (dl1) << (64 - (HIGH_LL_FRAC_BITS + 1));

    return SIGND (dl1) ? -(l >> -exp) : l >> -exp;
}
#define __fixtfdi ___fixtfdi
#endif
#undef L_fixtfdi

#ifdef L_fixunsdfdi
#define EXPD(fp)	(((fp.l.upper) >> 20) & 0x7FF)
#define EXCESSD		1022
#define SIGNBIT		0x80000000
#define SIGND(fp)	((fp.l.upper) & SIGNBIT)
#define MANTD_LL(fp)	((fp.ll & (HIDDEND_LL-1)) | HIDDEND_LL)
#define FRACD_LL(fp)	(fp.ll & (HIDDEND_LL-1))
#define HIDDEND_LL	((UDItype_x)1 << 52)

typedef int DItype_x __attribute__ ((mode (DI)));
typedef unsigned int UDItype_x __attribute__ ((mode (DI)));
typedef int SItype_x __attribute__ ((mode (SI)));
typedef unsigned int USItype_x __attribute__ ((mode (SI)));

union double_long {
    double d;
    struct {
      SItype_x upper;
      USItype_x lower;
    } l;
    UDItype_x ll;
};

UDItype_x __fixunsdfdi (double a1);

/* convert double to unsigned int */
UDItype_x
__fixunsdfdi (double a1)
{
    register union double_long dl1;
    register int exp;
    register UDItype_x l;

    dl1.d = a1;

    /* +/- 0, denormalized, negative */

    if (!EXPD (dl1) || SIGND(dl1))
      return 0;

    exp = EXPD (dl1) - EXCESSD - 53;

    /* number < 1 */

    if (exp < -53)
      return 0;

    /* NaN */

    if ((EXPD(dl1) == 0x7ff) && (FRACD_LL(dl1) != 0)) /* NaN */
      return 0x0ULL;

    /* Number big number & + inf */

    if (exp >= 12) {
      return 0xFFFFFFFFFFFFFFFFULL;
    }

    l = MANTD_LL(dl1);

    /* shift down until exp < 12 or l = 0 */
    if (exp > 0)
      l <<= exp;
    else
      l >>= -exp;

    return l;
}
#define __fixunsdfdi ___fixunsdfdi
#endif
#undef L_fixunsdfdi

#ifdef L_fixdfdi
#define EXPD(fp)	(((fp.l.upper) >> 20) & 0x7FF)
#define EXCESSD		1022
#define SIGNBIT		0x80000000
#define SIGND(fp)	((fp.l.upper) & SIGNBIT)
#define MANTD_LL(fp)	((fp.ll & (HIDDEND_LL-1)) | HIDDEND_LL)
#define FRACD_LL(fp)	(fp.ll & (HIDDEND_LL-1))
#define HIDDEND_LL	((UDItype_x)1 << 52)

typedef int DItype_x __attribute__ ((mode (DI)));
typedef unsigned int UDItype_x __attribute__ ((mode (DI)));
typedef int SItype_x __attribute__ ((mode (SI)));
typedef unsigned int USItype_x __attribute__ ((mode (SI)));

union double_long {
    double d;
    struct {
      SItype_x upper;
      USItype_x lower;
    } l;
    UDItype_x ll;
};

DItype_x __fixdfdi (double a1);

/* convert double to int */
DItype_x
__fixdfdi (double a1)
{
    register union double_long dl1;
    register int exp;
    register DItype_x l;

    dl1.d = a1;

    /* +/- 0, denormalized */

    if (!EXPD (dl1))
      return 0;

    exp = EXPD (dl1) - EXCESSD - 53;

    /* number < 1 */

    if (exp < -53)
      return 0;

    /* NaN */

    if ((EXPD(dl1) == 0x7ff) && (FRACD_LL(dl1) != 0)) /* NaN */
      return 0x8000000000000000ULL;

    /* Number big number & +/- inf */

    if (exp >= 11) {
	l = (long long)1<<63;
	if (!SIGND(dl1))
	    l--;
	return l;
    }

    l = MANTD_LL(dl1);

    /* shift down until exp < 12 or l = 0 */
    if (exp > 0)
      l <<= exp;
    else
      l >>= -exp;

    return (SIGND (dl1) ? -l : l);
}
#define __fixdfdi ___fixdfdi
#endif
#undef L_fixdfdi

#ifdef L_fixunssfdi
#define EXP(fp)         (((fp.l) >> 23) & 0xFF)
#define EXCESS          126
#define SIGNBIT         0x80000000
#define SIGN(fp)        ((fp.l) & SIGNBIT)
#define HIDDEN          (1 << 23)
#define MANT(fp)        (((fp.l) & 0x7FFFFF) | HIDDEN)
#define FRAC(fp)        ((fp.l) & 0x7FFFFF)

typedef int DItype_x __attribute__ ((mode (DI)));
typedef unsigned int UDItype_x __attribute__ ((mode (DI)));
typedef int SItype_x __attribute__ ((mode (SI)));
typedef unsigned int USItype_x __attribute__ ((mode (SI)));

union float_long
  {
    float f;
    USItype_x l;
  };

UDItype_x __fixunssfdi (float a1);

/* convert float to unsigned int */
UDItype_x
__fixunssfdi (float a1)
{
    register union float_long fl1;
    register int exp;
    register UDItype_x l;

    fl1.f = a1;

    /* +/- 0, denormalized, negative */

    if (!EXP (fl1) || SIGN(fl1))
      return 0;

    exp = EXP (fl1) - EXCESS - 24;

    /* number < 1 */

    if (exp < -24)
      return 0;

    /* NaN */

    if ((EXP(fl1) == 0xff) && (FRAC(fl1) != 0)) /* NaN */
      return 0x0ULL;

    /* Number big number & + inf */

    if (exp >= 41) {
      return 0xFFFFFFFFFFFFFFFFULL;
    }

    l = MANT(fl1);

    if (exp > 0)
      l <<= exp;
    else
      l >>= -exp;

    return l;
}
#define __fixunssfdi ___fixunssfdi
#endif
#undef L_fixunssfdi

#ifdef L_fixsfdi
#define EXP(fp)         (((fp.l) >> 23) & 0xFF)
#define EXCESS          126
#define SIGNBIT         0x80000000
#define SIGN(fp)        ((fp.l) & SIGNBIT)
#define HIDDEN          (1 << 23)
#define MANT(fp)        (((fp.l) & 0x7FFFFF) | HIDDEN)
#define FRAC(fp)        ((fp.l) & 0x7FFFFF)

typedef int DItype_x __attribute__ ((mode (DI)));
typedef unsigned int UDItype_x __attribute__ ((mode (DI)));
typedef int SItype_x __attribute__ ((mode (SI)));
typedef unsigned int USItype_x __attribute__ ((mode (SI)));

union float_long
  {
    float f;
    USItype_x l;
  };

DItype_x __fixsfdi (float a1);

/* convert double to int */
DItype_x
__fixsfdi (float a1)
{
    register union float_long fl1;
    register int exp;
    register DItype_x l;

    fl1.f = a1;

    /* +/- 0, denormalized */

    if (!EXP (fl1))
      return 0;

    exp = EXP (fl1) - EXCESS - 24;

    /* number < 1 */

    if (exp < -24)
      return 0;

    /* NaN */

    if ((EXP(fl1) == 0xff) && (FRAC(fl1) != 0)) /* NaN */
      return 0x8000000000000000ULL;

    /* Number big number & +/- inf */

    if (exp >= 40) {
	l = (long long)1<<63;
	if (!SIGN(fl1))
	    l--;
	return l;
    }

    l = MANT(fl1);

    if (exp > 0)
      l <<= exp;
    else
      l >>= -exp;

    return (SIGN (fl1) ? -l : l);
}
#define __fixsfdi ___fixsfdi
#endif
#undef L_fixsfdi