1 2 /*============================================================================ 3 4 This C source 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 #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 #ifdef SOFTFLOAT_FAST_INT64 45 46 void 47 extF80M_mul( 48 const extFloat80_t *aPtr, const extFloat80_t *bPtr, extFloat80_t *zPtr ) 49 { 50 51 *zPtr = extF80_mul( *aPtr, *bPtr ); 52 53 } 54 55 #else 56 57 void 58 extF80M_mul( 59 const extFloat80_t *aPtr, const extFloat80_t *bPtr, extFloat80_t *zPtr ) 60 { 61 const struct extFloat80M *aSPtr, *bSPtr; 62 struct extFloat80M *zSPtr; 63 uint_fast16_t uiA64; 64 int32_t expA; 65 uint_fast16_t uiB64; 66 int32_t expB; 67 bool signZ; 68 uint_fast16_t exp, uiZ64; 69 uint64_t uiZ0, sigA, sigB; 70 int32_t expZ; 71 uint32_t sigProd[4], *extSigZPtr; 72 73 /*------------------------------------------------------------------------ 74 *------------------------------------------------------------------------*/ 75 aSPtr = (const struct extFloat80M *) aPtr; 76 bSPtr = (const struct extFloat80M *) bPtr; 77 zSPtr = (struct extFloat80M *) zPtr; 78 /*------------------------------------------------------------------------ 79 *------------------------------------------------------------------------*/ 80 uiA64 = aSPtr->signExp; 81 expA = expExtF80UI64( uiA64 ); 82 uiB64 = bSPtr->signExp; 83 expB = expExtF80UI64( uiB64 ); 84 signZ = signExtF80UI64( uiA64 ) ^ signExtF80UI64( uiB64 ); 85 /*------------------------------------------------------------------------ 86 *------------------------------------------------------------------------*/ 87 if ( (expA == 0x7FFF) || (expB == 0x7FFF) ) { 88 if ( softfloat_tryPropagateNaNExtF80M( aSPtr, bSPtr, zSPtr ) ) return; 89 if ( 90 (! aSPtr->signif && (expA != 0x7FFF)) 91 || (! bSPtr->signif && (expB != 0x7FFF)) 92 ) { 93 softfloat_invalidExtF80M( zSPtr ); 94 return; 95 } 96 uiZ64 = packToExtF80UI64( signZ, 0x7FFF ); 97 uiZ0 = UINT64_C( 0x8000000000000000 ); 98 goto uiZ; 99 } 100 /*------------------------------------------------------------------------ 101 *------------------------------------------------------------------------*/ 102 if ( ! expA ) expA = 1; 103 sigA = aSPtr->signif; 104 if ( ! (sigA & UINT64_C( 0x8000000000000000 )) ) { 105 if ( ! sigA ) goto zero; 106 expA += softfloat_normExtF80SigM( &sigA ); 107 } 108 if ( ! expB ) expB = 1; 109 sigB = bSPtr->signif; 110 if ( ! (sigB & UINT64_C( 0x8000000000000000 )) ) { 111 if ( ! sigB ) goto zero; 112 expB += softfloat_normExtF80SigM( &sigB ); 113 } 114 /*------------------------------------------------------------------------ 115 *------------------------------------------------------------------------*/ 116 expZ = expA + expB - 0x3FFE; 117 softfloat_mul64To128M( sigA, sigB, sigProd ); 118 if ( sigProd[indexWordLo( 4 )] ) sigProd[indexWord( 4, 1 )] |= 1; 119 extSigZPtr = &sigProd[indexMultiwordHi( 4, 3 )]; 120 if ( sigProd[indexWordHi( 4 )] < 0x80000000 ) { 121 --expZ; 122 softfloat_add96M( extSigZPtr, extSigZPtr, extSigZPtr ); 123 } 124 softfloat_roundPackMToExtF80M( 125 signZ, expZ, extSigZPtr, extF80_roundingPrecision, zSPtr ); 126 return; 127 /*------------------------------------------------------------------------ 128 *------------------------------------------------------------------------*/ 129 zero: 130 uiZ64 = packToExtF80UI64( signZ, 0 ); 131 uiZ0 = 0; 132 uiZ: 133 zSPtr->signExp = uiZ64; 134 zSPtr->signif = uiZ0; 135 136 } 137 138 #endif 139 140