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bitencode.c
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bitencode.c
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/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/* */
/* This file is part of the program and library */
/* SCIP --- Solving Constraint Integer Programs */
/* */
/* Copyright (C) 2002-2014 Konrad-Zuse-Zentrum */
/* fuer Informationstechnik Berlin */
/* */
/* SCIP is distributed under the terms of the ZIB Academic License. */
/* */
/* You should have received a copy of the ZIB Academic License */
/* along with SCIP; see the file COPYING. If not email to scip@zib.de. */
/* */
/* * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * * */
/**@file bitencode.c
* @brief packing single and dual bit values
* @author Thorsten Koch
* @author Tobias Achterberg
*/
/*---+----1----+----2----+----3----+----4----+----5----+----6----+----7----+----8----+----9----+----0----+----1----+----2*/
#include <assert.h>
#include "scip/def.h"
#include "scip/bitencode.h"
/** encode a single bit vector into packed format */
void SCIPencodeSingleBit(
const int* inp, /**< unpacked input vector */
SCIP_SINGLEPACKET* out, /**< buffer to store the packed vector */
int count /**< number of elements */
)
{
static const SCIP_SINGLEPACKET mask[SCIP_SINGLEPACKETSIZE][2] = { /* if the packet size changes, the mask has to be updated */
{0x00000000, 0x00000001},
{0x00000000, 0x00000002},
{0x00000000, 0x00000004},
{0x00000000, 0x00000008},
{0x00000000, 0x00000010},
{0x00000000, 0x00000020},
{0x00000000, 0x00000040},
{0x00000000, 0x00000080},
{0x00000000, 0x00000100},
{0x00000000, 0x00000200},
{0x00000000, 0x00000400},
{0x00000000, 0x00000800},
{0x00000000, 0x00001000},
{0x00000000, 0x00002000},
{0x00000000, 0x00004000},
{0x00000000, 0x00008000},
{0x00000000, 0x00010000},
{0x00000000, 0x00020000},
{0x00000000, 0x00040000},
{0x00000000, 0x00080000},
{0x00000000, 0x00100000},
{0x00000000, 0x00200000},
{0x00000000, 0x00400000},
{0x00000000, 0x00800000},
{0x00000000, 0x01000000},
{0x00000000, 0x02000000},
{0x00000000, 0x04000000},
{0x00000000, 0x08000000},
{0x00000000, 0x10000000},
{0x00000000, 0x20000000},
{0x00000000, 0x40000000},
{0x00000000, 0x80000000}
};
int i;
int rest;
int nfull;
assert(inp != NULL || count == 0);
assert(out != NULL || count == 0);
assert(count >= 0);
assert(SCIP_SINGLEPACKETSIZE == 32);
rest = count % (int)SCIP_SINGLEPACKETSIZE;
nfull = count - rest;
for( i = 0; i < nfull; i += (int)SCIP_SINGLEPACKETSIZE )
{
assert(inp != NULL);
assert(out != NULL);
#ifndef NDEBUG
{
unsigned int j;
for( j = 0; j < SCIP_SINGLEPACKETSIZE; ++j )
assert(0 <= inp[j] && inp[j] <= 1);
}
#endif
*out++ =
mask[0][inp[0]] | mask[1][inp[1]] | mask[2][inp[2]] | mask[3][inp[3]]
| mask[4][inp[4]] | mask[5][inp[5]] | mask[6][inp[6]] | mask[7][inp[7]]
| mask[8][inp[8]] | mask[9][inp[9]] | mask[10][inp[10]] | mask[11][inp[11]]
| mask[12][inp[12]] | mask[13][inp[13]] | mask[14][inp[14]] | mask[15][inp[15]]
| mask[16][inp[16]] | mask[17][inp[17]] | mask[18][inp[18]] | mask[19][inp[19]]
| mask[20][inp[20]] | mask[21][inp[21]] | mask[22][inp[22]] | mask[23][inp[23]]
| mask[24][inp[24]] | mask[25][inp[25]] | mask[26][inp[26]] | mask[27][inp[27]]
| mask[28][inp[28]] | mask[29][inp[29]] | mask[30][inp[30]] | mask[31][inp[31]];
inp += SCIP_SINGLEPACKETSIZE;
}
if( rest > 0 )
{
SCIP_SINGLEPACKET m = (SCIP_SINGLEPACKET) 0u;
assert(inp != NULL);
assert(out != NULL);
for( i = 0; i < rest; i++ )
m |= mask[i][inp[i]];
*out = m;
}
}
/** decode a packed single bit vector into unpacked format */
void SCIPdecodeSingleBit(
const SCIP_SINGLEPACKET* inp, /**< packed input vector */
int* out, /**< buffer to store unpacked vector */
int count /**< number of elements */
)
{
SCIP_SINGLEPACKET m;
int rest;
int nfull;
int i;
assert(inp != NULL || count == 0);
assert(out != NULL || count == 0);
assert(count >= 0);
assert(SCIP_SINGLEPACKETSIZE == 32);
rest = count % (int)SCIP_SINGLEPACKETSIZE;
nfull = count - rest;
for( i = 0; i < nfull; i += (int)SCIP_SINGLEPACKETSIZE )
{
assert(inp != NULL);
assert(out != NULL);
m = *inp++;
*out++ = m & 1;
m >>= 1;
*out++ = m & 1;
m >>= 1;
*out++ = m & 1;
m >>= 1;
*out++ = m & 1;
m >>= 1;
*out++ = m & 1;
m >>= 1;
*out++ = m & 1;
m >>= 1;
*out++ = m & 1;
m >>= 1;
*out++ = m & 1;
m >>= 1;
*out++ = m & 1;
m >>= 1;
*out++ = m & 1;
m >>= 1;
*out++ = m & 1;
m >>= 1;
*out++ = m & 1;
m >>= 1;
*out++ = m & 1;
m >>= 1;
*out++ = m & 1;
m >>= 1;
*out++ = m & 1;
m >>= 1;
*out++ = m & 1;
m >>= 1;
*out++ = m & 1;
m >>= 1;
*out++ = m & 1;
m >>= 1;
*out++ = m & 1;
m >>= 1;
*out++ = m & 1;
m >>= 1;
*out++ = m & 1;
m >>= 1;
*out++ = m & 1;
m >>= 1;
*out++ = m & 1;
m >>= 1;
*out++ = m & 1;
m >>= 1;
*out++ = m & 1;
m >>= 1;
*out++ = m & 1;
m >>= 1;
*out++ = m & 1;
m >>= 1;
*out++ = m & 1;
m >>= 1;
*out++ = m & 1;
m >>= 1;
*out++ = m & 1;
m >>= 1;
*out++ = m & 1;
m >>= 1;
*out++ = m & 1;
assert(m >> 1 == 0);
}
if( rest > 0 )
{
assert(inp != NULL);
assert(out != NULL);
m = *inp;
for( i = 0; i < rest; i++ )
{
*out++ = m & 1;
m >>= 1;
}
}
}
/** encode a dual bit vector into packed format */
void SCIPencodeDualBit(
const int* inp, /**< unpacked input vector */
SCIP_DUALPACKET* out, /**< buffer to store the packed vector */
int count /**< number of elements */
)
{
static const SCIP_DUALPACKET mask[SCIP_DUALPACKETSIZE][4] = { /* if the packet size changes, the mask has to be updated */
{0x00000000, 0x00000001, 0x00000002, 0x00000003},
{0x00000000, 0x00000004, 0x00000008, 0x0000000C},
{0x00000000, 0x00000010, 0x00000020, 0x00000030},
{0x00000000, 0x00000040, 0x00000080, 0x000000C0},
{0x00000000, 0x00000100, 0x00000200, 0x00000300},
{0x00000000, 0x00000400, 0x00000800, 0x00000C00},
{0x00000000, 0x00001000, 0x00002000, 0x00003000},
{0x00000000, 0x00004000, 0x00008000, 0x0000C000},
{0x00000000, 0x00010000, 0x00020000, 0x00030000},
{0x00000000, 0x00040000, 0x00080000, 0x000C0000},
{0x00000000, 0x00100000, 0x00200000, 0x00300000},
{0x00000000, 0x00400000, 0x00800000, 0x00C00000},
{0x00000000, 0x01000000, 0x02000000, 0x03000000},
{0x00000000, 0x04000000, 0x08000000, 0x0C000000},
{0x00000000, 0x10000000, 0x20000000, 0x30000000},
{0x00000000, 0x40000000, 0x80000000, 0xC0000000}
};
int i;
int rest;
int nfull;
assert(inp != NULL || count == 0);
assert(out != NULL || count == 0);
assert(count >= 0);
assert(SCIP_DUALPACKETSIZE == 16);
rest = count % (int)SCIP_DUALPACKETSIZE;
nfull = count - rest;
for( i = 0; i < nfull; i += (int)SCIP_DUALPACKETSIZE, inp += (int)SCIP_DUALPACKETSIZE )
{
assert(inp != NULL);
assert(out != NULL);
#ifndef NDEBUG
{
unsigned int j;
for( j = 0; j < SCIP_DUALPACKETSIZE; ++j )
assert(0 <= inp[j] && inp[j] <= 3);
}
#endif
*out++ =
mask[0][inp[0]] | mask[1][inp[1]] | mask[2][inp[2]] | mask[3][inp[3]]
| mask[4][inp[4]] | mask[5][inp[5]] | mask[6][inp[6]]
| mask[7][inp[7]] | mask[8][inp[8]] | mask[9][inp[9]]
| mask[10][inp[10]] | mask[11][inp[11]] | mask[12][inp[12]]
| mask[13][inp[13]] | mask[14][inp[14]] | mask[15][inp[15]];
}
if( rest > 0 )
{
SCIP_DUALPACKET m = (SCIP_DUALPACKET) 0u;
assert(inp != NULL);
assert(out != NULL);
for( i = 0; i < rest; i++ )
m |= mask[i][inp[i]];
*out = m;
}
}
/** decode a packed dual bit vector into unpacked format */
void SCIPdecodeDualBit(
const SCIP_DUALPACKET* inp, /**< packed input vector */
int* out, /**< buffer to store unpacked vector */
int count /**< number of elements */
)
{
SCIP_DUALPACKET m;
int rest;
int nfull;
int i;
assert(inp != NULL || count == 0);
assert(out != NULL || count == 0);
assert(count >= 0);
assert(SCIP_DUALPACKETSIZE == 16);
rest = count % (int)SCIP_DUALPACKETSIZE;
nfull = count - rest;
for( i = 0; i < nfull; i += (int)SCIP_DUALPACKETSIZE )
{
assert(inp != NULL);
assert(out != NULL);
m = *inp++;
*out++ = m & 3;
m >>= 2;
*out++ = m & 3;
m >>= 2;
*out++ = m & 3;
m >>= 2;
*out++ = m & 3;
m >>= 2;
*out++ = m & 3;
m >>= 2;
*out++ = m & 3;
m >>= 2;
*out++ = m & 3;
m >>= 2;
*out++ = m & 3;
m >>= 2;
*out++ = m & 3;
m >>= 2;
*out++ = m & 3;
m >>= 2;
*out++ = m & 3;
m >>= 2;
*out++ = m & 3;
m >>= 2;
*out++ = m & 3;
m >>= 2;
*out++ = m & 3;
m >>= 2;
*out++ = m & 3;
m >>= 2;
*out++ = m & 3;
assert(m >> 2 == 0);
}
if( rest > 0 )
{
assert(inp != NULL);
assert(out != NULL);
m = *inp;
for( i = 0; i < rest; i++ )
{
*out++ = m & 3;
m >>= 2;
}
}
}