1
2/*============================================================================
3
4This C source file is part of the SoftFloat IEEE Floating-Point Arithmetic
5Package, Release 3e, by John R. Hauser.
6
7Copyright 2011, 2012, 2013, 2014 The Regents of the University of California.
8All rights reserved.
9
10Redistribution and use in source and binary forms, with or without
11modification, 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
24THIS SOFTWARE IS PROVIDED BY THE REGENTS AND CONTRIBUTORS "AS IS", AND ANY
25EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
26WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE, ARE
27DISCLAIMED.  IN NO EVENT SHALL THE REGENTS OR CONTRIBUTORS BE LIABLE FOR ANY
28DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
29(INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
30LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
31ON 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
33SOFTWARE, 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
46void
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
57void
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