1 2 /*============================================================================ 3 4 This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic 5 Package, Release 3e, 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 #include <stdbool.h> 38 #include <stdint.h> 39 #include "platform.h" 40 #include "internals.h" 41 #include "specialize.h" 42 #include "softfloat.h" 43 44 void softfloat_addF128M(const uint32_t * aWPtr,const uint32_t * bWPtr,uint32_t * zWPtr,bool negateB)45 softfloat_addF128M( 46 const uint32_t *aWPtr, 47 const uint32_t *bWPtr, 48 uint32_t *zWPtr, 49 bool negateB 50 ) 51 { 52 uint32_t uiA96; 53 int32_t expA; 54 uint32_t uiB96; 55 int32_t expB; 56 uint32_t uiZ96; 57 bool signZ, signB; 58 const uint32_t *tempPtr; 59 uint32_t sig96A, sig96B; 60 int32_t expDiff; 61 uint_fast8_t 62 (*addCarryMRoutinePtr)( 63 uint_fast8_t, 64 const uint32_t *, 65 const uint32_t *, 66 uint_fast8_t, 67 uint32_t * 68 ); 69 uint32_t extSigZ[5], wordSigZ; 70 uint_fast8_t carry; 71 void (*roundPackRoutinePtr)( bool, int32_t, uint32_t *, uint32_t * ); 72 73 /*------------------------------------------------------------------------ 74 *------------------------------------------------------------------------*/ 75 uiA96 = aWPtr[indexWordHi( 4 )]; 76 expA = expF128UI96( uiA96 ); 77 uiB96 = bWPtr[indexWordHi( 4 )]; 78 expB = expF128UI96( uiB96 ); 79 /*------------------------------------------------------------------------ 80 *------------------------------------------------------------------------*/ 81 if ( (expA == 0x7FFF) || (expB == 0x7FFF) ) { 82 if ( softfloat_tryPropagateNaNF128M( aWPtr, bWPtr, zWPtr ) ) return; 83 uiZ96 = uiA96; 84 if ( expB == 0x7FFF ) { 85 uiZ96 = uiB96 ^ packToF128UI96( negateB, 0, 0 ); 86 if ( (expA == 0x7FFF) && (uiZ96 != uiA96) ) { 87 softfloat_invalidF128M( zWPtr ); 88 return; 89 } 90 } 91 zWPtr[indexWordHi( 4 )] = uiZ96; 92 zWPtr[indexWord( 4, 2 )] = 0; 93 zWPtr[indexWord( 4, 1 )] = 0; 94 zWPtr[indexWord( 4, 0 )] = 0; 95 return; 96 } 97 /*------------------------------------------------------------------------ 98 *------------------------------------------------------------------------*/ 99 signZ = signF128UI96( uiA96 ); 100 signB = signF128UI96( uiB96 ) ^ negateB; 101 negateB = (signZ != signB); 102 if ( (uint32_t) (uiA96<<1) < (uint32_t) (uiB96<<1) ) { 103 signZ = signB; 104 expA = expB; 105 expB = expF128UI96( uiA96 ); 106 tempPtr = aWPtr; 107 aWPtr = bWPtr; 108 bWPtr = tempPtr; 109 uiA96 = uiB96; 110 uiB96 = bWPtr[indexWordHi( 4 )]; 111 } 112 sig96A = fracF128UI96( uiA96 ); 113 sig96B = fracF128UI96( uiB96 ); 114 if ( expA ) { 115 --expA; 116 sig96A |= 0x00010000; 117 if ( expB ) { 118 --expB; 119 sig96B |= 0x00010000; 120 } 121 } 122 /*------------------------------------------------------------------------ 123 *------------------------------------------------------------------------*/ 124 addCarryMRoutinePtr = 125 negateB ? softfloat_addComplCarryM : softfloat_addCarryM; 126 expDiff = expA - expB; 127 if ( expDiff ) { 128 /*-------------------------------------------------------------------- 129 *--------------------------------------------------------------------*/ 130 extSigZ[indexWordHi( 5 )] = sig96B; 131 extSigZ[indexWord( 5, 3 )] = bWPtr[indexWord( 4, 2 )]; 132 extSigZ[indexWord( 5, 2 )] = bWPtr[indexWord( 4, 1 )]; 133 extSigZ[indexWord( 5, 1 )] = bWPtr[indexWord( 4, 0 )]; 134 extSigZ[indexWord( 5, 0 )] = 0; 135 softfloat_shiftRightJam160M( extSigZ, expDiff, extSigZ ); 136 sig96B = extSigZ[indexWordHi( 5 )]; 137 carry = 0; 138 if ( negateB ) { 139 sig96B = ~sig96B; 140 wordSigZ = extSigZ[indexWordLo( 5 )]; 141 extSigZ[indexWordLo( 5 )] = -wordSigZ; 142 carry = ! wordSigZ; 143 } 144 carry = 145 (*addCarryMRoutinePtr)( 146 3, 147 &aWPtr[indexMultiwordLo( 4, 3 )], 148 &extSigZ[indexMultiword( 5, 3, 1 )], 149 carry, 150 &extSigZ[indexMultiword( 5, 3, 1 )] 151 ); 152 wordSigZ = sig96A + sig96B + carry; 153 } else { 154 /*-------------------------------------------------------------------- 155 *--------------------------------------------------------------------*/ 156 extSigZ[indexWordLo( 5 )] = 0; 157 carry = 158 (*addCarryMRoutinePtr)( 159 3, 160 &aWPtr[indexMultiwordLo( 4, 3 )], 161 &bWPtr[indexMultiwordLo( 4, 3 )], 162 negateB, 163 &extSigZ[indexMultiword( 5, 3, 1 )] 164 ); 165 if ( negateB ) { 166 wordSigZ = sig96A + ~sig96B + carry; 167 if ( wordSigZ & 0x80000000 ) { 168 signZ = ! signZ; 169 carry = 170 softfloat_addComplCarry96M( 171 &bWPtr[indexMultiwordLo( 4, 3 )], 172 &aWPtr[indexMultiwordLo( 4, 3 )], 173 1, 174 &extSigZ[indexMultiword( 5, 3, 1 )] 175 ); 176 wordSigZ = sig96B + ~sig96A + carry; 177 } else { 178 if ( 179 ! wordSigZ && ! extSigZ[indexWord( 5, 3 )] 180 && ! ( extSigZ[indexWord( 5, 2 )] 181 | extSigZ[indexWord( 5, 1 )] 182 | extSigZ[indexWord( 5, 0 )] 183 ) 184 ) { 185 signZ = (softfloat_roundingMode == softfloat_round_min); 186 zWPtr[indexWordHi( 4 )] = packToF128UI96( signZ, 0, 0 ); 187 zWPtr[indexWord( 4, 2 )] = 0; 188 zWPtr[indexWord( 4, 1 )] = 0; 189 zWPtr[indexWord( 4, 0 )] = 0; 190 return; 191 } 192 } 193 } else { 194 wordSigZ = sig96A + sig96B + carry; 195 } 196 } 197 extSigZ[indexWordHi( 5 )] = wordSigZ; 198 /*------------------------------------------------------------------------ 199 *------------------------------------------------------------------------*/ 200 roundPackRoutinePtr = softfloat_normRoundPackMToF128M; 201 if ( 0x00010000 <= wordSigZ ) { 202 if ( 0x00020000 <= wordSigZ ) { 203 ++expA; 204 softfloat_shortShiftRightJam160M( extSigZ, 1, extSigZ ); 205 } 206 roundPackRoutinePtr = softfloat_roundPackMToF128M; 207 } 208 (*roundPackRoutinePtr)( signZ, expA, extSigZ, zWPtr ); 209 210 } 211 212