1 // SPDX-License-Identifier: BSD-3-Clause 2 3 /*============================================================================ 4 5 This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic 6 Package, Release 3a, by John R. Hauser. 7 8 Copyright 2011, 2012, 2013, 2014 The Regents of the University of California. 9 All rights reserved. 10 11 Redistribution and use in source and binary forms, with or without 12 modification, are permitted provided that the following conditions are met: 13 14 1. Redistributions of source code must retain the above copyright notice, 15 this list of conditions, and the following disclaimer. 16 17 2. Redistributions in binary form must reproduce the above copyright notice, 18 this list of conditions, and the following disclaimer in the documentation 19 and/or other materials provided with the distribution. 20 21 3. Neither the name of the University nor the names of its contributors may 22 be used to endorse or promote products derived from this software without 23 specific prior written permission. 24 25 THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS "AS IS", AND ANY 26 EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED 27 WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE 28 DISCLAIMED. IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY 29 DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES 30 (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; 31 LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND 32 ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT 33 (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS 34 SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. 35 36 =============================================================================*/ 37 38 #include <stdbool.h> 39 #include <stdint.h> 40 #include "platform.h" 41 #include "internals.h" 42 #include "specialize.h" 43 #include "softfloat.h" 44 45 #ifdef SOFTFLOAT_FAST_INT64 46 47 void f128M_mul(const float128_t * aPtr,const float128_t * bPtr,float128_t * zPtr)48 f128M_mul( const float128_t *aPtr, const float128_t *bPtr, float128_t *zPtr ) 49 { 50 51 *zPtr = f128_mul( *aPtr, *bPtr ); 52 53 } 54 55 #else 56 57 void f128M_mul(const float128_t * aPtr,const float128_t * bPtr,float128_t * zPtr)58 f128M_mul( const float128_t *aPtr, const float128_t *bPtr, float128_t *zPtr ) 59 { 60 const uint32_t *aWPtr, *bWPtr; 61 uint32_t *zWPtr; 62 uint32_t uiA96; 63 int32_t expA; 64 uint32_t uiB96; 65 int32_t expB; 66 bool signZ; 67 const uint32_t *ptr; 68 uint32_t uiZ96, sigA[4]; 69 uint_fast8_t shiftCount; 70 uint32_t sigB[4]; 71 int32_t expZ; 72 uint32_t sigProd[8], *extSigZPtr; 73 74 /*------------------------------------------------------------------------ 75 *------------------------------------------------------------------------*/ 76 aWPtr = (const uint32_t *) aPtr; 77 bWPtr = (const uint32_t *) bPtr; 78 zWPtr = (uint32_t *) zPtr; 79 /*------------------------------------------------------------------------ 80 *------------------------------------------------------------------------*/ 81 uiA96 = aWPtr[indexWordHi( 4 )]; 82 expA = expF128UI96( uiA96 ); 83 uiB96 = bWPtr[indexWordHi( 4 )]; 84 expB = expF128UI96( uiB96 ); 85 signZ = signF128UI96( uiA96 ) ^ signF128UI96( uiB96 ); 86 /*------------------------------------------------------------------------ 87 *------------------------------------------------------------------------*/ 88 if ( (expA == 0x7FFF) || (expB == 0x7FFF) ) { 89 if ( softfloat_tryPropagateNaNF128M( aWPtr, bWPtr, zWPtr ) ) return; 90 ptr = aWPtr; 91 if ( ! expA ) goto possiblyInvalid; 92 if ( ! expB ) { 93 ptr = bWPtr; 94 possiblyInvalid: 95 if ( 96 ! fracF128UI96( ptr[indexWordHi( 4 )] ) 97 && ! (ptr[indexWord( 4, 2 )] | ptr[indexWord( 4, 1 )] 98 | ptr[indexWord( 4, 0 )]) 99 ) { 100 softfloat_invalidF128M( zWPtr ); 101 return; 102 } 103 } 104 uiZ96 = packToF128UI96( signZ, 0x7FFF, 0 ); 105 goto uiZ96; 106 } 107 /*------------------------------------------------------------------------ 108 *------------------------------------------------------------------------*/ 109 if ( expA ) { 110 sigA[indexWordHi( 4 )] = fracF128UI96( uiA96 ) | 0x00010000; 111 sigA[indexWord( 4, 2 )] = aWPtr[indexWord( 4, 2 )]; 112 sigA[indexWord( 4, 1 )] = aWPtr[indexWord( 4, 1 )]; 113 sigA[indexWord( 4, 0 )] = aWPtr[indexWord( 4, 0 )]; 114 } else { 115 expA = softfloat_shiftNormSigF128M( aWPtr, 0, sigA ); 116 if ( expA == -128 ) goto zero; 117 } 118 if ( expB ) { 119 sigB[indexWordHi( 4 )] = fracF128UI96( uiB96 ) | 0x00010000; 120 sigB[indexWord( 4, 2 )] = bWPtr[indexWord( 4, 2 )]; 121 sigB[indexWord( 4, 1 )] = bWPtr[indexWord( 4, 1 )]; 122 sigB[indexWord( 4, 0 )] = bWPtr[indexWord( 4, 0 )]; 123 } else { 124 expB = softfloat_shiftNormSigF128M( bWPtr, 0, sigB ); 125 if ( expB == -128 ) goto zero; 126 } 127 /*------------------------------------------------------------------------ 128 *------------------------------------------------------------------------*/ 129 expZ = expA + expB - 0x4000; 130 softfloat_mul128MTo256M( sigA, sigB, sigProd ); 131 if ( 132 sigProd[indexWord( 8, 2 )] 133 || (sigProd[indexWord( 8, 1 )] | sigProd[indexWord( 8, 0 )]) 134 ) { 135 sigProd[indexWord( 8, 3 )] |= 1; 136 } 137 extSigZPtr = &sigProd[indexMultiwordHi( 8, 5 )]; 138 shiftCount = 16; 139 if ( extSigZPtr[indexWordHi( 5 )] & 2 ) { 140 ++expZ; 141 shiftCount = 15; 142 } 143 softfloat_shortShiftLeft160M( extSigZPtr, shiftCount, extSigZPtr ); 144 softfloat_roundPackMToF128M( signZ, expZ, extSigZPtr, zWPtr ); 145 return; 146 /*------------------------------------------------------------------------ 147 *------------------------------------------------------------------------*/ 148 zero: 149 uiZ96 = packToF128UI96( signZ, 0, 0 ); 150 uiZ96: 151 zWPtr[indexWordHi( 4 )] = uiZ96; 152 zWPtr[indexWord( 4, 2 )] = 0; 153 zWPtr[indexWord( 4, 1 )] = 0; 154 zWPtr[indexWord( 4, 0 )] = 0; 155 156 } 157 158 #endif 159 160