1  /* Definitions of target machine for GNU compiler, for IBM S/390
       2     Copyright (C) 1999-2023 Free Software Foundation, Inc.
       3     Contributed by Hartmut Penner (hpenner@de.ibm.com) and
       4                    Ulrich Weigand (uweigand@de.ibm.com).
       5  
       6  This file is part of GCC.
       7  
       8  GCC is free software; you can redistribute it and/or modify it under
       9  the terms of the GNU General Public License as published by the Free
      10  Software Foundation; either version 3, or (at your option) any later
      11  version.
      12  
      13  GCC is distributed in the hope that it will be useful, but WITHOUT ANY
      14  WARRANTY; without even the implied warranty of MERCHANTABILITY or
      15  FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
      16  for more details.
      17  
      18  Under Section 7 of GPL version 3, you are granted additional
      19  permissions described in the GCC Runtime Library Exception, version
      20  3.1, as published by the Free Software Foundation.
      21  
      22  You should have received a copy of the GNU General Public License and
      23  a copy of the GCC Runtime Library Exception along with this program;
      24  see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
      25  <http://www.gnu.org/licenses/>.  */
      26  
      27  #ifndef __s390x__
      28  
      29  #define EXPONENT_BIAS   127
      30  #define MANTISSA_BITS   23
      31  #define EXP(fp)         (((fp.l) >> MANTISSA_BITS) & 0xFF)
      32  #define PRECISION       (MANTISSA_BITS + 1)
      33  #define SIGNBIT         0x80000000
      34  #define SIGN(fp)        ((fp.l) & SIGNBIT)
      35  #define HIDDEN          (1 << MANTISSA_BITS)
      36  #define MANT(fp)        (((fp.l) & 0x7FFFFF) | HIDDEN)
      37  #define FRAC(fp)        ((fp.l) & 0x7FFFFF)
      38  #define LLONG_MAX       9223372036854775807LL
      39  #define LLONG_MIN       (-LLONG_MAX - 1LL)
      40  
      41  typedef int DItype_x __attribute__ ((mode (DI)));
      42  typedef unsigned int UDItype_x __attribute__ ((mode (DI)));
      43  typedef int SItype_x __attribute__ ((mode (SI)));
      44  typedef unsigned int USItype_x __attribute__ ((mode (SI)));
      45  
      46  union float_long
      47    {
      48      float f;
      49      USItype_x l;
      50    };
      51  
      52  static __inline__ void
      53  fexceptdiv (float d, float e)
      54  {
      55    __asm__ __volatile__ ("debr %0,%1" : : "f" (d), "f" (e) );
      56  }
      57  
      58  DItype_x __fixsfdi (float a1);
      59  
      60  /* convert double to int */
      61  DItype_x
      62  __fixsfdi (float a1)
      63  {
      64      register union float_long fl1;
      65      register int exp;
      66      register DItype_x l;
      67  
      68      fl1.f = a1;
      69  
      70      /* +/- 0, denormalized */
      71      if (!EXP (fl1))
      72        return 0;
      73  
      74      exp = EXP (fl1) - EXPONENT_BIAS - MANTISSA_BITS;
      75  
      76      /* number < 1 */
      77      if (exp <= -PRECISION)
      78        return 0;
      79  
      80      /* NaN */
      81  
      82      if ((EXP (fl1) == 0xff) && (FRAC (fl1) != 0)) /* NaN */
      83        {
      84  	/* C99 Annex F.4 requires an "invalid" exception to be thrown.  */
      85  	fexceptdiv (0.0, 0.0);
      86  	return 0x8000000000000000ULL;
      87        }
      88  
      89      /* Number big number & +/- inf */
      90      if (exp >= 40) {      
      91        /* Don't throw an exception for -1p+63  */
      92        if (!SIGN (fl1) || exp > 40 || FRAC (fl1) != 0)
      93  	/* C99 Annex F.4 requires an "invalid" exception to be thrown.  */
      94  	fexceptdiv (0.0, 0.0);
      95        return SIGN (fl1) ? LLONG_MIN : LLONG_MAX;
      96      }
      97  
      98      l = MANT (fl1);
      99  
     100      if (exp > 0)
     101        l <<= exp;
     102      else
     103        l >>= -exp;
     104  
     105      return (SIGN (fl1) ? -l : l);
     106  }
     107  #endif /* !__s390x__ */