softfloat/internals.h

   1
   2 /*============================================================================
   3
   4 This C header file is part of the SoftFloat IEEE Floating-Point Arithmetic
   5 Package, Release 3a, by John R. Hauser.
   6
   7 Copyright 2011, 2012, 2013, 2014 The Regents of the University of California.
   8 All rights 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 internals_h
  38 #define internals_h 1
  39
  40 #include <stdbool.h>
  41 #include <stdint.h>
  42 #include "primitives.h"
  43 #include "softfloat_types.h"
  44
  45 union ui32_f32 { uint32_t ui; float32_t f; };
  46 union ui64_f64 { uint64_t ui; float64_t f; };
  47
  48 #ifdef SOFTFLOAT_FAST_INT64
  49 union extF80M_extF80 { struct extFloat80M fM; extFloat80_t f; };
  50 union ui128_f128 { struct uint128 ui; float128_t f; };
  51 #endif
  52
  53 enum {
  54     softfloat_mulAdd_subC    = 1,
  55     softfloat_mulAdd_subProd = 2
  56 };
  57
  58 /*----------------------------------------------------------------------------
  59 *----------------------------------------------------------------------------*/
  60 uint_fast32_t
  61  softfloat_roundPackToUI32( bool, uint_fast64_t, uint_fast8_t, bool );
  62
  63 #ifdef SOFTFLOAT_FAST_INT64
  64 uint_fast64_t
  65  softfloat_roundPackToUI64(
  66      bool, uint_fast64_t, uint_fast64_t, uint_fast8_t, bool );
  67 #else
  68 uint_fast64_t
  69  softfloat_roundPackMToUI64( bool, uint32_t *, uint_fast8_t, bool );
  70 #endif
  71
  72 int_fast32_t
  73  softfloat_roundPackToI32( bool, uint_fast64_t, uint_fast8_t, bool );
  74
  75 #ifdef SOFTFLOAT_FAST_INT64
  76 int_fast64_t
  77  softfloat_roundPackToI64(
  78      bool, uint_fast64_t, uint_fast64_t, uint_fast8_t, bool );
  79 #else
  80 int_fast64_t softfloat_roundPackMToI64( bool, uint32_t *, uint_fast8_t, bool );
  81 #endif
  82
  83 /*----------------------------------------------------------------------------
  84 *----------------------------------------------------------------------------*/
  85 #define signF32UI( a ) ((bool) ((uint32_t) (a)>>31))
  86 #define expF32UI( a ) ((int_fast16_t) ((a)>>23) & 0xFF)
  87 #define fracF32UI( a ) ((a) & 0x007FFFFF)
  88 #define packToF32UI( sign, exp, sig ) (((uint32_t) (sign)<<31) + ((uint32_t) (exp)<<23) + (sig))
  89
  90 #define isNaNF32UI( a ) ((((a) & 0x7F800000) == 0x7F800000) && ((a) & 0x007FFFFF))
  91
  92 struct exp16_sig32 { int_fast16_t exp; uint_fast32_t sig; };
  93 struct exp16_sig32 softfloat_normSubnormalF32Sig( uint_fast32_t );
  94
  95 float32_t softfloat_roundPackToF32( bool, int_fast16_t, uint_fast32_t );
  96 float32_t softfloat_normRoundPackToF32( bool, int_fast16_t, uint_fast32_t );
  97
  98 float32_t softfloat_addMagsF32( uint_fast32_t, uint_fast32_t, bool );
  99 float32_t softfloat_subMagsF32( uint_fast32_t, uint_fast32_t, bool );
 100 float32_t
 101  softfloat_mulAddF32(
 102      uint_fast32_t, uint_fast32_t, uint_fast32_t, uint_fast8_t );
 103
 104 /*----------------------------------------------------------------------------
 105 *----------------------------------------------------------------------------*/
 106 #define signF64UI( a ) ((bool) ((uint64_t) (a)>>63))
 107 #define expF64UI( a ) ((int_fast16_t) ((a)>>52) & 0x7FF)
 108 #define fracF64UI( a ) ((a) & UINT64_C( 0x000FFFFFFFFFFFFF ))
 109 #define packToF64UI( sign, exp, sig ) ((uint64_t) (((uint_fast64_t) (sign)<<63) + ((uint_fast64_t) (exp)<<52) + (sig)))
 110
 111 #define isNaNF64UI( a ) ((((a) & UINT64_C( 0x7FF0000000000000 )) == UINT64_C( 0x7FF0000000000000 )) && ((a) & UINT64_C( 0x000FFFFFFFFFFFFF )))
 112
 113 struct exp16_sig64 { int_fast16_t exp; uint_fast64_t sig; };
 114 struct exp16_sig64 softfloat_normSubnormalF64Sig( uint_fast64_t );
 115
 116 float64_t softfloat_roundPackToF64( bool, int_fast16_t, uint_fast64_t );
 117 float64_t softfloat_normRoundPackToF64( bool, int_fast16_t, uint_fast64_t );
 118
 119 float64_t softfloat_addMagsF64( uint_fast64_t, uint_fast64_t, bool );
 120 float64_t softfloat_subMagsF64( uint_fast64_t, uint_fast64_t, bool );
 121 float64_t
 122  softfloat_mulAddF64(
 123      uint_fast64_t, uint_fast64_t, uint_fast64_t, uint_fast8_t );
 124
 125 /*----------------------------------------------------------------------------
 126 *----------------------------------------------------------------------------*/
 127 #define signExtF80UI64( a64 ) ((bool) ((uint16_t) (a64)>>15))
 128 #define expExtF80UI64( a64 ) ((a64) & 0x7FFF)
 129 #define packToExtF80UI64( sign, exp ) ((uint_fast16_t) (sign)<<15 | (exp))
 130
 131 #define isNaNExtF80UI( a64, a0 ) ((((a64) & 0x7FFF) == 0x7FFF) && ((a0) & UINT64_C( 0x7FFFFFFFFFFFFFFF )))
 132
 133 #ifdef SOFTFLOAT_FAST_INT64
 134
 135 /*----------------------------------------------------------------------------
 136 *----------------------------------------------------------------------------*/
 137
 138 struct exp32_sig64 { int_fast32_t exp; uint64_t sig; };
 139 struct exp32_sig64 softfloat_normSubnormalExtF80Sig( uint_fast64_t );
 140
 141 extFloat80_t
 142  softfloat_roundPackToExtF80(
 143      bool, int_fast32_t, uint_fast64_t, uint_fast64_t, uint_fast8_t );
 144 extFloat80_t
 145  softfloat_normRoundPackToExtF80(
 146      bool, int_fast32_t, uint_fast64_t, uint_fast64_t, uint_fast8_t );
 147
 148 extFloat80_t
 149  softfloat_addMagsExtF80(
 150      uint_fast16_t, uint_fast64_t, uint_fast16_t, uint_fast64_t, bool );
 151 extFloat80_t
 152  softfloat_subMagsExtF80(
 153      uint_fast16_t, uint_fast64_t, uint_fast16_t, uint_fast64_t, bool );
 154
 155 /*----------------------------------------------------------------------------
 156 *----------------------------------------------------------------------------*/
 157 #define signF128UI64( a64 ) ((bool) ((uint64_t) (a64)>>63))
 158 #define expF128UI64( a64 ) ((int_fast32_t) ((a64)>>48) & 0x7FFF)
 159 #define fracF128UI64( a64 ) ((a64) & UINT64_C( 0x0000FFFFFFFFFFFF ))
 160 #define packToF128UI64( sign, exp, sig64 ) (((uint_fast64_t) (sign)<<63) + ((uint_fast64_t) (exp)<<48) + (sig64))
 161
 162 #define isNaNF128UI( a64, a0 ) ((((a64) & UINT64_C( 0x7FFF000000000000 )) == UINT64_C( 0x7FFF000000000000 )) && (a0 || ((a64) & UINT64_C( 0x0000FFFFFFFFFFFF ))))
 163
 164 struct exp32_sig128 { int_fast32_t exp; struct uint128 sig; };
 165 struct exp32_sig128
 166  softfloat_normSubnormalF128Sig( uint_fast64_t, uint_fast64_t );
 167
 168 float128_t
 169  softfloat_roundPackToF128(
 170      bool, int_fast32_t, uint_fast64_t, uint_fast64_t, uint_fast64_t );
 171 float128_t
 172  softfloat_normRoundPackToF128(
 173      bool, int_fast32_t, uint_fast64_t, uint_fast64_t );
 174
 175 float128_t
 176  softfloat_addMagsF128(
 177      uint_fast64_t, uint_fast64_t, uint_fast64_t, uint_fast64_t, bool );
 178 float128_t
 179  softfloat_subMagsF128(
 180      uint_fast64_t, uint_fast64_t, uint_fast64_t, uint_fast64_t, bool );
 181 float128_t
 182  softfloat_mulAddF128(
 183      uint_fast64_t,
 184      uint_fast64_t,
 185      uint_fast64_t,
 186      uint_fast64_t,
 187      uint_fast64_t,
 188      uint_fast64_t,
 189      uint_fast8_t
 190  );
 191
 192 #else
 193
 194 /*----------------------------------------------------------------------------
 195 *----------------------------------------------------------------------------*/
 196
 197 bool
 198  softfloat_tryPropagateNaNExtF80M(
 199      const struct extFloat80M *,
 200      const struct extFloat80M *,
 201      struct extFloat80M *
 202  );
 203 void softfloat_invalidExtF80M( struct extFloat80M * );
 204
 205 int softfloat_normExtF80SigM( uint64_t * );
 206
 207 void
 208  softfloat_roundPackMToExtF80M(
 209      bool, int32_t, uint32_t *, uint_fast8_t, struct extFloat80M * );
 210 void
 211  softfloat_normRoundPackMToExtF80M(
 212      bool, int32_t, uint32_t *, uint_fast8_t, struct extFloat80M * );
 213
 214 void
 215  softfloat_addExtF80M(
 216      const struct extFloat80M *,
 217      const struct extFloat80M *,
 218      struct extFloat80M *,
 219      bool
 220  );
 221
 222 int
 223  softfloat_compareNonnormExtF80M(
 224      const struct extFloat80M *, const struct extFloat80M * );
 225
 226 /*----------------------------------------------------------------------------
 227 *----------------------------------------------------------------------------*/
 228 #define signF128UI96( a96 ) ((bool) ((uint32_t) (a96)>>31))
 229 #define expF128UI96( a96 ) ((int32_t) ((a96)>>16) & 0x7FFF)
 230 #define fracF128UI96( a96 ) ((a96) & 0x0000FFFF)
 231 #define packToF128UI96( sign, exp, sig96 ) (((uint32_t) (sign)<<31) + ((uint32_t) (exp)<<16) + (sig96))
 232
 233 bool softfloat_isNaNF128M( const uint32_t * );
 234
 235 bool
 236  softfloat_tryPropagateNaNF128M(
 237      const uint32_t *, const uint32_t *, uint32_t * );
 238 void softfloat_invalidF128M( uint32_t * );
 239
 240 int softfloat_shiftNormSigF128M( const uint32_t *, uint_fast8_t, uint32_t * );
 241
 242 void softfloat_roundPackMToF128M( bool, int32_t, uint32_t *, uint32_t * );
 243 void softfloat_normRoundPackMToF128M( bool, int32_t, uint32_t *, uint32_t * );
 244
 245 void
 246  softfloat_addF128M( const uint32_t *, const uint32_t *, uint32_t *, bool );
 247 void
 248  softfloat_mulAddF128M(
 249      const uint32_t *,
 250      const uint32_t *,
 251      const uint32_t *,
 252      uint32_t *,
 253      uint_fast8_t
 254  );
 255
 256 #endif
 257
 258 #endif
 259