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source: vbox/trunk/src/libs/softfloat-3e/source/s_shiftRightJam256M.c@ 104661

Last change on this file since 104661 was 94548, checked in by vboxsync, 3 years ago

libs/softfloat-3e: GCC build fixes for the ring-0 library version. bugref:9898

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File size: 4.0 KB
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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, 2015, 2016 The Regents of the University of
8California. All 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 <stdint.h>
38#include "platform.h"
39#include "primitiveTypes.h"
40
41#ifndef softfloat_shiftRightJam256M
42# include "primitives.h" /* VBox: Missing prototype */
43
44static
45 void
46 softfloat_shortShiftRightJamM(
47 uint_fast8_t size_words,
48 const uint64_t *aPtr,
49 uint_fast8_t dist,
50 uint64_t *zPtr
51 )
52{
53 uint_fast8_t uNegDist;
54 unsigned int index, lastIndex;
55 uint64_t partWordZ, wordA;
56
57 uNegDist = -dist;
58 index = indexWordLo( size_words );
59 lastIndex = indexWordHi( size_words );
60 wordA = aPtr[index];
61 partWordZ = wordA>>dist;
62 if ( partWordZ<<dist != wordA ) partWordZ |= 1;
63 while ( index != lastIndex ) {
64 wordA = aPtr[index + wordIncr];
65 zPtr[index] = wordA<<(uNegDist & 63) | partWordZ;
66 index += wordIncr;
67 partWordZ = wordA>>dist;
68 }
69 zPtr[index] = partWordZ;
70
71}
72
73void
74 softfloat_shiftRightJam256M(
75 const uint64_t *aPtr, uint_fast32_t dist, uint64_t *zPtr )
76{
77 uint64_t wordJam;
78 uint_fast32_t wordDist;
79 uint64_t *ptr = (uint64_t *)0; /* vbox: shut up MSC warning */
80 uint_fast8_t i, innerDist;
81
82 wordJam = 0;
83 wordDist = dist>>6;
84 if ( wordDist ) {
85 if ( 4 < wordDist ) wordDist = 4;
86 ptr = (uint64_t *) (aPtr + indexMultiwordLo( 4, wordDist ));
87 i = wordDist;
88 do {
89 wordJam = *ptr++;
90 if ( wordJam ) break;
91 --i;
92 } while ( i );
93 ptr = zPtr;
94 }
95 if ( wordDist < 4 ) {
96 aPtr += indexMultiwordHiBut( 4, wordDist );
97 innerDist = dist & 63;
98 if ( innerDist ) {
99 softfloat_shortShiftRightJamM(
100 4 - wordDist,
101 aPtr,
102 innerDist,
103 zPtr + indexMultiwordLoBut( 4, wordDist )
104 );
105 if ( ! wordDist ) goto wordJam;
106 } else {
107 aPtr += indexWordLo( 4 - wordDist );
108 ptr = zPtr + indexWordLo( 4 );
109 for ( i = 4 - wordDist; i; --i ) {
110 *ptr = *aPtr;
111 aPtr += wordIncr;
112 ptr += wordIncr;
113 }
114 }
115 ptr = zPtr + indexMultiwordHi( 4, wordDist );
116 }
117 do {
118 *ptr++ = 0;
119 --wordDist;
120 } while ( wordDist );
121 wordJam:
122 if ( wordJam ) zPtr[indexWordLo( 4 )] |= 1;
123
124}
125
126#endif
127
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