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 SIGNBIT         0x80000000
      33  #define SIGN(fp)        ((fp.l) & SIGNBIT)
      34  #define HIDDEN          (1 << MANTISSA_BITS)
      35  #define MANT(fp)        (((fp.l) & 0x7FFFFF) | HIDDEN)
      36  #define FRAC(fp)        ((fp.l) & 0x7FFFFF)
      37  
      38  typedef int DItype_x __attribute__ ((mode (DI)));
      39  typedef unsigned int UDItype_x __attribute__ ((mode (DI)));
      40  typedef int SItype_x __attribute__ ((mode (SI)));
      41  typedef unsigned int USItype_x __attribute__ ((mode (SI)));
      42  
      43  union float_long
      44    {
      45      float f;
      46      USItype_x l;
      47    };
      48  
      49  static __inline__ void
      50  fexceptdiv (float d, float e)
      51  {
      52    __asm__ __volatile__ ("debr %0,%1" : : "f" (d), "f" (e) );
      53  }
      54  
      55  UDItype_x __fixunssfdi (float a1);
      56  
      57  /* convert float to unsigned int */
      58  UDItype_x
      59  __fixunssfdi (float a1)
      60  {
      61      register union float_long fl1;
      62      register int exp;
      63      register UDItype_x l;
      64  
      65      fl1.f = a1;
      66  
      67      /* +/- 0, denormalized  */
      68      if (!EXP (fl1))
      69        return 0;
      70  
      71      /* Negative.  */
      72      if (SIGN (fl1))
      73        { 
      74  	/* Value is <= -1.0
      75  	   C99 Annex F.4 requires an "invalid" exception to be thrown.  */
      76  	if (EXP (fl1) >= EXPONENT_BIAS)
      77  	  fexceptdiv (0.0, 0.0);
      78  	return 0;
      79        }
      80  
      81      exp = EXP (fl1) - EXPONENT_BIAS - MANTISSA_BITS;
      82  
      83      /* number < 1 */
      84      if (exp < -24)
      85        return 0;
      86  
      87      /* NaN */
      88  
      89      if ((EXP (fl1) == 0xff) && (FRAC (fl1) != 0)) /* NaN */
      90        {
      91  	/* C99 Annex F.4 requires an "invalid" exception to be thrown.  */
      92  	fexceptdiv (0.0, 0.0);	
      93  	return 0x0ULL;
      94        }
      95  
      96      /* Number big number & + inf */
      97  
      98      if (exp >= 41)
      99        {
     100  	/* C99 Annex F.4 requires an "invalid" exception to be thrown.  */
     101  	fexceptdiv (0.0, 0.0);
     102  	return 0xFFFFFFFFFFFFFFFFULL;
     103        }
     104  
     105      l = MANT (fl1);
     106  
     107      if (exp > 0)
     108        l <<= exp;
     109      else
     110        l >>= -exp;
     111  
     112      return l;
     113  }
     114  #endif /* !__s390x__ */