github.com/igggame/nebulas-go@v2.1.0+incompatible/nbre/3rd_party/SoftFloat-3e/source/include/opts-GCC.h (about)

     1  
     2  /*============================================================================
     3  
     4  This C header file is part of the SoftFloat IEEE Floating-Point Arithmetic
     5  Package, Release 3e, by John R. Hauser.
     6  
     7  Copyright 2017 The Regents of the University of California.  All rights
     8  reserved.
     9  
    10  Redistribution and use in source and binary forms, with or without
    11  modification, are permitted provided that the following conditions are met:
    12  
    13   1. Redistributions of source code must retain the above copyright notice,
    14      this list of conditions, and the following disclaimer.
    15  
    16   2. Redistributions in binary form must reproduce the above copyright notice,
    17      this list of conditions, and the following disclaimer in the documentation
    18      and/or other materials provided with the distribution.
    19  
    20   3. Neither the name of the University nor the names of its contributors may
    21      be used to endorse or promote products derived from this software without
    22      specific prior written permission.
    23  
    24  THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS "AS IS", AND ANY
    25  EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
    26  WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE
    27  DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
    28  DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
    29  (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
    30  LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
    31  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
    32  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
    33  SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
    34  
    35  =============================================================================*/
    36  
    37  #ifndef opts_GCC_h
    38  #define opts_GCC_h 1
    39  
    40  #ifdef INLINE
    41  
    42  #include <stdint.h>
    43  #include "primitiveTypes.h"
    44  
    45  #ifdef SOFTFLOAT_BUILTIN_CLZ
    46  
    47  INLINE uint_fast8_t softfloat_countLeadingZeros16( uint16_t a )
    48      { return a ? __builtin_clz( a ) - 16 : 16; }
    49  #define softfloat_countLeadingZeros16 softfloat_countLeadingZeros16
    50  
    51  INLINE uint_fast8_t softfloat_countLeadingZeros32( uint32_t a )
    52      { return a ? __builtin_clz( a ) : 32; }
    53  #define softfloat_countLeadingZeros32 softfloat_countLeadingZeros32
    54  
    55  INLINE uint_fast8_t softfloat_countLeadingZeros64( uint64_t a )
    56      { return a ? __builtin_clzll( a ) : 64; }
    57  #define softfloat_countLeadingZeros64 softfloat_countLeadingZeros64
    58  
    59  #endif
    60  
    61  #ifdef SOFTFLOAT_INTRINSIC_INT128
    62  
    63  INLINE struct uint128 softfloat_mul64ByShifted32To128( uint64_t a, uint32_t b )
    64  {
    65      union { unsigned __int128 ui; struct uint128 s; } uZ;
    66      uZ.ui = (unsigned __int128) a * ((uint_fast64_t) b<<32);
    67      return uZ.s;
    68  }
    69  #define softfloat_mul64ByShifted32To128 softfloat_mul64ByShifted32To128
    70  
    71  INLINE struct uint128 softfloat_mul64To128( uint64_t a, uint64_t b )
    72  {
    73      union { unsigned __int128 ui; struct uint128 s; } uZ;
    74      uZ.ui = (unsigned __int128) a * b;
    75      return uZ.s;
    76  }
    77  #define softfloat_mul64To128 softfloat_mul64To128
    78  
    79  INLINE
    80  struct uint128 softfloat_mul128By32( uint64_t a64, uint64_t a0, uint32_t b )
    81  {
    82      union { unsigned __int128 ui; struct uint128 s; } uZ;
    83      uZ.ui = ((unsigned __int128) a64<<64 | a0) * b;
    84      return uZ.s;
    85  }
    86  #define softfloat_mul128By32 softfloat_mul128By32
    87  
    88  INLINE
    89  void
    90   softfloat_mul128To256M(
    91       uint64_t a64, uint64_t a0, uint64_t b64, uint64_t b0, uint64_t *zPtr )
    92  {
    93      unsigned __int128 z0, mid1, mid, z128;
    94      z0 = (unsigned __int128) a0 * b0;
    95      mid1 = (unsigned __int128) a64 * b0;
    96      mid = mid1 + (unsigned __int128) a0 * b64;
    97      z128 = (unsigned __int128) a64 * b64;
    98      z128 += (unsigned __int128) (mid < mid1)<<64 | mid>>64;
    99      mid <<= 64;
   100      z0 += mid;
   101      z128 += (z0 < mid);
   102      zPtr[indexWord( 4, 0 )] = z0;
   103      zPtr[indexWord( 4, 1 )] = z0>>64;
   104      zPtr[indexWord( 4, 2 )] = z128;
   105      zPtr[indexWord( 4, 3 )] = z128>>64;
   106  }
   107  #define softfloat_mul128To256M softfloat_mul128To256M
   108  
   109  #endif
   110  
   111  #endif
   112  
   113  #endif
   114