softfloat/source/include/opts-GCC.h

   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