softfloat/internals.h

   1
   2 /*============================================================================
   3
   4 This C header file is part of the SoftFloat IEEE Floating-Point Arithmetic
   5 Package, Release 3d, by John R. Hauser.
   6
   7 Copyright 2011, 2012, 2013, 2014, 2015, 2016, 2017 The Regents of the
   8 University of California.  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 #ifdef __cplusplus
  46 extern "C" {
  47 #endif
  48
  49 union ui16_f16 { uint16_t ui; float16_t f; };
  50 union ui32_f32 { uint32_t ui; float32_t f; };
  51 union ui64_f64 { uint64_t ui; float64_t f; };
  52
  53 #ifdef SOFTFLOAT_FAST_INT64
  54 union extF80M_extF80 { struct extFloat80M fM; extFloat80_t f; };
  55 union ui128_f128 { struct uint128 ui; float128_t f; };
  56 #endif
  57
  58 enum {
  59     softfloat_mulAdd_subC    = 1,
  60     softfloat_mulAdd_subProd = 2
  61 };
  62
  63 /*----------------------------------------------------------------------------
  64 *----------------------------------------------------------------------------*/
  65 uint_fast32_t softfloat_roundToUI32( bool, uint_fast64_t, uint_fast8_t, bool );
  66
  67 #ifdef SOFTFLOAT_FAST_INT64
  68 uint_fast64_t
  69  softfloat_roundToUI64(
  70      bool, uint_fast64_t, uint_fast64_t, uint_fast8_t, bool );
  71 #else
  72 uint_fast64_t softfloat_roundMToUI64( bool, uint32_t *, uint_fast8_t, bool );
  73 #endif
  74
  75 int_fast32_t softfloat_roundToI32( bool, uint_fast64_t, uint_fast8_t, bool );
  76
  77 #ifdef SOFTFLOAT_FAST_INT64
  78 int_fast64_t
  79  softfloat_roundToI64(
  80      bool, uint_fast64_t, uint_fast64_t, uint_fast8_t, bool );
  81 #else
  82 int_fast64_t softfloat_roundMToI64( bool, uint32_t *, uint_fast8_t, bool );
  83 #endif
  84
  85 /*----------------------------------------------------------------------------
  86 *----------------------------------------------------------------------------*/
  87 #define signF16UI( a ) ((bool) ((uint16_t) (a)>>15))
  88 #define expF16UI( a ) ((int_fast8_t) ((a)>>10) & 0x1F)
  89 #define fracF16UI( a ) ((a) & 0x03FF)
  90 #define packToF16UI( sign, exp, sig ) (((uint16_t) (sign)<<15) + ((uint16_t) (exp)<<10) + (sig))
  91
  92 #define isNaNF16UI( a ) (((~(a) & 0x7C00) == 0) && ((a) & 0x03FF))
  93
  94 struct exp8_sig16 { int_fast8_t exp; uint_fast16_t sig; };
  95 struct exp8_sig16 softfloat_normSubnormalF16Sig( uint_fast16_t );
  96
  97 float16_t softfloat_roundPackToF16( bool, int_fast16_t, uint_fast16_t );
  98 float16_t softfloat_normRoundPackToF16( bool, int_fast16_t, uint_fast16_t );
  99
 100 float16_t softfloat_addMagsF16( uint_fast16_t, uint_fast16_t );
 101 float16_t softfloat_subMagsF16( uint_fast16_t, uint_fast16_t );
 102 float16_t
 103  softfloat_mulAddF16(
 104      uint_fast16_t, uint_fast16_t, uint_fast16_t, uint_fast8_t );
 105
 106 /*----------------------------------------------------------------------------
 107 *----------------------------------------------------------------------------*/
 108 #define signF32UI( a ) ((bool) ((uint32_t) (a)>>31))
 109 #define expF32UI( a ) ((int_fast16_t) ((a)>>23) & 0xFF)
 110 #define fracF32UI( a ) ((a) & 0x007FFFFF)
 111 #define packToF32UI( sign, exp, sig ) (((uint32_t) (sign)<<31) + ((uint32_t) (exp)<<23) + (sig))
 112
 113 #define isNaNF32UI( a ) (((~(a) & 0x7F800000) == 0) && ((a) & 0x007FFFFF))
 114
 115 struct exp16_sig32 { int_fast16_t exp; uint_fast32_t sig; };
 116 struct exp16_sig32 softfloat_normSubnormalF32Sig( uint_fast32_t );
 117
 118 float32_t softfloat_roundPackToF32( bool, int_fast16_t, uint_fast32_t );
 119 float32_t softfloat_normRoundPackToF32( bool, int_fast16_t, uint_fast32_t );
 120
 121 float32_t softfloat_addMagsF32( uint_fast32_t, uint_fast32_t );
 122 float32_t softfloat_subMagsF32( uint_fast32_t, uint_fast32_t );
 123 float32_t
 124  softfloat_mulAddF32(
 125      uint_fast32_t, uint_fast32_t, uint_fast32_t, uint_fast8_t );
 126
 127 /*----------------------------------------------------------------------------
 128 *----------------------------------------------------------------------------*/
 129 #define signF64UI( a ) ((bool) ((uint64_t) (a)>>63))
 130 #define expF64UI( a ) ((int_fast16_t) ((a)>>52) & 0x7FF)
 131 #define fracF64UI( a ) ((a) & UINT64_C( 0x000FFFFFFFFFFFFF ))
 132 #define packToF64UI( sign, exp, sig ) ((uint64_t) (((uint_fast64_t) (sign)<<63) + ((uint_fast64_t) (exp)<<52) + (sig)))
 133
 134 #define isNaNF64UI( a ) (((~(a) & UINT64_C( 0x7FF0000000000000 )) == 0) && ((a) & UINT64_C( 0x000FFFFFFFFFFFFF )))
 135
 136 struct exp16_sig64 { int_fast16_t exp; uint_fast64_t sig; };
 137 struct exp16_sig64 softfloat_normSubnormalF64Sig( uint_fast64_t );
 138
 139 float64_t softfloat_roundPackToF64( bool, int_fast16_t, uint_fast64_t );
 140 float64_t softfloat_normRoundPackToF64( bool, int_fast16_t, uint_fast64_t );
 141
 142 float64_t softfloat_addMagsF64( uint_fast64_t, uint_fast64_t, bool );
 143 float64_t softfloat_subMagsF64( uint_fast64_t, uint_fast64_t, bool );
 144 float64_t
 145  softfloat_mulAddF64(
 146      uint_fast64_t, uint_fast64_t, uint_fast64_t, uint_fast8_t );
 147
 148 /*----------------------------------------------------------------------------
 149 *----------------------------------------------------------------------------*/
 150 #define signExtF80UI64( a64 ) ((bool) ((uint16_t) (a64)>>15))
 151 #define expExtF80UI64( a64 ) ((a64) & 0x7FFF)
 152 #define packToExtF80UI64( sign, exp ) ((uint_fast16_t) (sign)<<15 | (exp))
 153
 154 #define isNaNExtF80UI( a64, a0 ) ((((a64) & 0x7FFF) == 0x7FFF) && ((a0) & UINT64_C( 0x7FFFFFFFFFFFFFFF )))
 155
 156 #ifdef SOFTFLOAT_FAST_INT64
 157
 158 /*----------------------------------------------------------------------------
 159 *----------------------------------------------------------------------------*/
 160
 161 struct exp32_sig64 { int_fast32_t exp; uint64_t sig; };
 162 struct exp32_sig64 softfloat_normSubnormalExtF80Sig( uint_fast64_t );
 163
 164 extFloat80_t
 165  softfloat_roundPackToExtF80(
 166      bool, int_fast32_t, uint_fast64_t, uint_fast64_t, uint_fast8_t );
 167 extFloat80_t
 168  softfloat_normRoundPackToExtF80(
 169      bool, int_fast32_t, uint_fast64_t, uint_fast64_t, uint_fast8_t );
 170
 171 extFloat80_t
 172  softfloat_addMagsExtF80(
 173      uint_fast16_t, uint_fast64_t, uint_fast16_t, uint_fast64_t, bool );
 174 extFloat80_t
 175  softfloat_subMagsExtF80(
 176      uint_fast16_t, uint_fast64_t, uint_fast16_t, uint_fast64_t, bool );
 177
 178 /*----------------------------------------------------------------------------
 179 *----------------------------------------------------------------------------*/
 180 #define signF128UI64( a64 ) ((bool) ((uint64_t) (a64)>>63))
 181 #define expF128UI64( a64 ) ((int_fast32_t) ((a64)>>48) & 0x7FFF)
 182 #define fracF128UI64( a64 ) ((a64) & UINT64_C( 0x0000FFFFFFFFFFFF ))
 183 #define packToF128UI64( sign, exp, sig64 ) (((uint_fast64_t) (sign)<<63) + ((uint_fast64_t) (exp)<<48) + (sig64))
 184
 185 #define isNaNF128UI( a64, a0 ) (((~(a64) & UINT64_C( 0x7FFF000000000000 )) == 0) && (a0 || ((a64) & UINT64_C( 0x0000FFFFFFFFFFFF ))))
 186
 187 struct exp32_sig128 { int_fast32_t exp; struct uint128 sig; };
 188 struct exp32_sig128
 189  softfloat_normSubnormalF128Sig( uint_fast64_t, uint_fast64_t );
 190
 191 float128_t
 192  softfloat_roundPackToF128(
 193      bool, int_fast32_t, uint_fast64_t, uint_fast64_t, uint_fast64_t );
 194 float128_t
 195  softfloat_normRoundPackToF128(
 196      bool, int_fast32_t, uint_fast64_t, uint_fast64_t );
 197
 198 float128_t
 199  softfloat_addMagsF128(
 200      uint_fast64_t, uint_fast64_t, uint_fast64_t, uint_fast64_t, bool );
 201 float128_t
 202  softfloat_subMagsF128(
 203      uint_fast64_t, uint_fast64_t, uint_fast64_t, uint_fast64_t, bool );
 204 float128_t
 205  softfloat_mulAddF128(
 206      uint_fast64_t,
 207      uint_fast64_t,
 208      uint_fast64_t,
 209      uint_fast64_t,
 210      uint_fast64_t,
 211      uint_fast64_t,
 212      uint_fast8_t
 213  );
 214
 215 #else
 216
 217 /*----------------------------------------------------------------------------
 218 *----------------------------------------------------------------------------*/
 219
 220 bool
 221  softfloat_tryPropagateNaNExtF80M(
 222      const struct extFloat80M *,
 223      const struct extFloat80M *,
 224      struct extFloat80M *
 225  );
 226 void softfloat_invalidExtF80M( struct extFloat80M * );
 227
 228 int softfloat_normExtF80SigM( uint64_t * );
 229
 230 void
 231  softfloat_roundPackMToExtF80M(
 232      bool, int32_t, uint32_t *, uint_fast8_t, struct extFloat80M * );
 233 void
 234  softfloat_normRoundPackMToExtF80M(
 235      bool, int32_t, uint32_t *, uint_fast8_t, struct extFloat80M * );
 236
 237 void
 238  softfloat_addExtF80M(
 239      const struct extFloat80M *,
 240      const struct extFloat80M *,
 241      struct extFloat80M *,
 242      bool
 243  );
 244
 245 int
 246  softfloat_compareNonnormExtF80M(
 247      const struct extFloat80M *, const struct extFloat80M * );
 248
 249 /*----------------------------------------------------------------------------
 250 *----------------------------------------------------------------------------*/
 251 #define signF128UI96( a96 ) ((bool) ((uint32_t) (a96)>>31))
 252 #define expF128UI96( a96 ) ((int32_t) ((a96)>>16) & 0x7FFF)
 253 #define fracF128UI96( a96 ) ((a96) & 0x0000FFFF)
 254 #define packToF128UI96( sign, exp, sig96 ) (((uint32_t) (sign)<<31) + ((uint32_t) (exp)<<16) + (sig96))
 255
 256 bool softfloat_isNaNF128M( const uint32_t * );
 257
 258 bool
 259  softfloat_tryPropagateNaNF128M(
 260      const uint32_t *, const uint32_t *, uint32_t * );
 261 void softfloat_invalidF128M( uint32_t * );
 262
 263 int softfloat_shiftNormSigF128M( const uint32_t *, uint_fast8_t, uint32_t * );
 264
 265 void softfloat_roundPackMToF128M( bool, int32_t, uint32_t *, uint32_t * );
 266 void softfloat_normRoundPackMToF128M( bool, int32_t, uint32_t *, uint32_t * );
 267
 268 void
 269  softfloat_addF128M( const uint32_t *, const uint32_t *, uint32_t *, bool );
 270 void
 271  softfloat_mulAddF128M(
 272      const uint32_t *,
 273      const uint32_t *,
 274      const uint32_t *,
 275      uint32_t *,
 276      uint_fast8_t
 277  );
 278
 279 #endif
 280
 281 #ifdef __cplusplus
 282 }
 283 #endif
 284
 285 #endif
 286