486 lines
17 KiB
C
486 lines
17 KiB
C
#include <stdlib.h>
|
|
#include <assert.h>
|
|
#include <string.h>
|
|
|
|
#include "dtypes.h"
|
|
#include "bitvector.h"
|
|
|
|
#ifdef WIN32
|
|
#include <malloc.h>
|
|
#define alloca _alloca
|
|
#endif
|
|
|
|
// greater than this # of words we use malloc instead of alloca
|
|
#define MALLOC_CUTOFF 2000
|
|
|
|
u_int32_t bitreverse(u_int32_t x)
|
|
{
|
|
u_int32_t m;
|
|
|
|
#ifdef __INTEL_COMPILER
|
|
x = _bswap(x);
|
|
#else
|
|
x = (x >> 16) | (x << 16); m = 0xff00ff00;
|
|
x = ((x & m) >> 8) | ((x & ~m) << 8);
|
|
#endif
|
|
m = 0xf0f0f0f0;
|
|
x = ((x & m) >> 4) | ((x & ~m) << 4); m = 0xcccccccc;
|
|
x = ((x & m) >> 2) | ((x & ~m) << 2); m = 0xaaaaaaaa;
|
|
x = ((x & m) >> 1) | ((x & ~m) << 1);
|
|
|
|
return x;
|
|
}
|
|
|
|
// shift all bits in a long bit vector
|
|
// n is # of int32s to consider, s is shift distance
|
|
// lowest bit-index is bit 0 of word 0
|
|
// TODO: handle boundary case of shift distance >= data size?
|
|
void bitvector_shr(u_int32_t *b, size_t n, u_int32_t s)
|
|
{
|
|
u_int32_t i;
|
|
if (s == 0 || n == 0) return;
|
|
i = (s>>5);
|
|
if (i) {
|
|
n -= i;
|
|
memmove(b, &b[i], n*4);
|
|
memset(&b[n], 0, i*4);
|
|
s &= 31;
|
|
}
|
|
for(i=0; i < n-1; i++) {
|
|
b[i] = (b[i]>>s) | (b[i+1]<<(32-s));
|
|
}
|
|
b[i]>>=s;
|
|
}
|
|
|
|
// out-of-place version, good for re-aligning a strided submatrix to
|
|
// linear representation when a copy is needed
|
|
// assumes that dest has the same amount of space as source, even if it
|
|
// wouldn't have been necessary to hold the shifted bits
|
|
void bitvector_shr_to(u_int32_t *dest, u_int32_t *b, size_t n, u_int32_t s)
|
|
{
|
|
u_int32_t i, j;
|
|
if (n == 0) return;
|
|
if (s == 0) {
|
|
memcpy(dest, b, n*4);
|
|
return;
|
|
}
|
|
j = (s>>5);
|
|
if (j) {
|
|
n -= j;
|
|
memset(&dest[n], 0, j*4);
|
|
s &= 31;
|
|
b = &b[j];
|
|
}
|
|
for(i=0; i < n-1; i++) {
|
|
dest[i] = (b[i]>>s) | (b[i+1]<<(32-s));
|
|
}
|
|
dest[i] = b[i]>>s;
|
|
}
|
|
|
|
void bitvector_shl(u_int32_t *b, size_t n, u_int32_t s)
|
|
{
|
|
u_int32_t i, scrap=0, temp;
|
|
if (s == 0 || n == 0) return;
|
|
i = (s>>5);
|
|
if (i) {
|
|
n -= i;
|
|
memmove(&b[i], b, n*4);
|
|
memset(b, 0, i*4);
|
|
s &= 31;
|
|
b = &b[i];
|
|
}
|
|
for(i=0; i < n; i++) {
|
|
temp = (b[i]<<s) | scrap;
|
|
scrap = b[i]>>(32-s);
|
|
b[i] = temp;
|
|
}
|
|
}
|
|
|
|
// if dest has more space than source, set scrap to true to keep the
|
|
// top bits that would otherwise be shifted out
|
|
void bitvector_shl_to(u_int32_t *dest, u_int32_t *b, size_t n, u_int32_t s,
|
|
bool_t scrap)
|
|
{
|
|
u_int32_t i, j, sc=0;
|
|
if (n == 0) return;
|
|
if (s == 0) {
|
|
memcpy(dest, b, n*4);
|
|
return;
|
|
}
|
|
j = (s>>5);
|
|
if (j) {
|
|
n -= j;
|
|
memset(dest, 0, j*4);
|
|
s &= 31;
|
|
dest = &dest[j];
|
|
}
|
|
for(i=0; i < n; i++) {
|
|
dest[i] = (b[i]<<s) | sc;
|
|
sc = b[i]>>(32-s);
|
|
}
|
|
if (scrap)
|
|
dest[i] = sc;
|
|
}
|
|
|
|
// set nbits to c, starting at given bit offset
|
|
// assumes offs < 32
|
|
void bitvector_fill(u_int32_t *b, u_int32_t offs, u_int32_t c, u_int32_t nbits)
|
|
{
|
|
index_t i;
|
|
u_int32_t nw, tail;
|
|
u_int32_t mask;
|
|
|
|
if (nbits == 0) return;
|
|
nw = (offs+nbits+31)>>5;
|
|
|
|
if (nw == 1) {
|
|
mask = (lomask(nbits)<<offs);
|
|
if (c) b[0]|=mask; else b[0]&=(~mask);
|
|
return;
|
|
}
|
|
|
|
mask = lomask(offs);
|
|
if (c) b[0]|=(~mask); else b[0]&=mask;
|
|
|
|
if (c) mask=ONES32; else mask = 0;
|
|
for(i=1; i < nw-1; i++)
|
|
b[i] = mask;
|
|
|
|
tail = (offs+nbits)&31;
|
|
if (tail==0) {
|
|
b[i] = mask;
|
|
}
|
|
else {
|
|
mask = lomask(tail);
|
|
if (c) b[i]|=mask; else b[i]&=(~mask);
|
|
}
|
|
}
|
|
|
|
void bitvector_not(u_int32_t *b, u_int32_t offs, u_int32_t nbits)
|
|
{
|
|
index_t i;
|
|
u_int32_t nw, tail;
|
|
u_int32_t mask;
|
|
|
|
if (nbits == 0) return;
|
|
nw = (offs+nbits+31)>>5;
|
|
|
|
if (nw == 1) {
|
|
mask = (lomask(nbits)<<offs);
|
|
b[0] ^= mask;
|
|
return;
|
|
}
|
|
|
|
mask = ~lomask(offs);
|
|
b[0]^=mask;
|
|
|
|
for(i=1; i < nw-1; i++)
|
|
b[i] = ~b[i];
|
|
|
|
tail = (offs+nbits)&31;
|
|
if (tail==0) {
|
|
b[i] = ~b[i];
|
|
}
|
|
else {
|
|
mask = lomask(tail);
|
|
b[i]^=mask;
|
|
}
|
|
}
|
|
|
|
// constant-space bit vector copy in a single pass, with arbitrary
|
|
// offsets and lengths. to get this right, there are 16 cases to handle!
|
|
#define BITVECTOR_COPY_OP(name, OP) \
|
|
void bitvector_##name(u_int32_t *dest, u_int32_t doffs, \
|
|
u_int32_t *src, u_int32_t soffs, u_int32_t nbits) \
|
|
{ \
|
|
index_t i; \
|
|
u_int32_t s, nw, tail, snw; \
|
|
u_int32_t mask, scrap; \
|
|
\
|
|
if (nbits == 0) return; \
|
|
nw = (doffs+nbits+31)>>5; \
|
|
\
|
|
if (soffs == doffs) { \
|
|
if (nw == 1) { \
|
|
mask = (lomask(nbits)<<doffs); \
|
|
dest[0] = (dest[0] & ~mask) | (OP(src[0]) & mask); \
|
|
return; \
|
|
} \
|
|
mask = ~lomask(doffs); \
|
|
dest[0] = (dest[0] & ~mask) | (OP(src[0]) & mask); \
|
|
for(i=1; i < nw-1; i++) \
|
|
dest[i] = OP(src[i]); \
|
|
tail = (doffs+nbits)&31; \
|
|
if (tail==0) { dest[i]=src[i]; } else { \
|
|
mask = lomask(tail); \
|
|
dest[i] = (dest[i] & ~mask) | (OP(src[i]) & mask); } \
|
|
return; \
|
|
} \
|
|
snw = (soffs+nbits+31)>>5; \
|
|
if (soffs < doffs) { \
|
|
s = doffs-soffs; \
|
|
if (nw == 1) { \
|
|
mask = (lomask(nbits)<<doffs); \
|
|
dest[0] = (dest[0] & ~mask) | ((OP(src[0])<<s) & mask); \
|
|
return; \
|
|
} \
|
|
mask = ~lomask(doffs); \
|
|
dest[0] = (dest[0] & ~mask) | ((OP(src[0])<<s) & mask); \
|
|
scrap = OP(src[0])>>(32-s); \
|
|
for(i=1; i < snw-1; i++) { \
|
|
dest[i] = (OP(src[i])<<s) | scrap; \
|
|
scrap = OP(src[i])>>(32-s); \
|
|
} \
|
|
tail = (doffs+nbits)&31; \
|
|
if (tail==0) { mask=ONES32; } else { mask = lomask(tail); } \
|
|
if (snw == nw) { \
|
|
dest[i] = (dest[i] & ~mask) | (((OP(src[i])<<s)|scrap) & mask); \
|
|
} \
|
|
else /* snw < nw */ { \
|
|
if (snw == 1) { \
|
|
dest[i] = (dest[i] & ~mask) | \
|
|
(((OP(src[i])<<s) | scrap) & mask); \
|
|
} \
|
|
else { \
|
|
dest[i] = (OP(src[i])<<s) | scrap; \
|
|
scrap = OP(src[i])>>(32-s); \
|
|
i++; \
|
|
dest[i] = (dest[i] & ~mask) | (scrap & mask); \
|
|
} \
|
|
} \
|
|
} \
|
|
else { \
|
|
s = soffs-doffs; \
|
|
if (snw == 1) { \
|
|
mask = (lomask(nbits)<<doffs); \
|
|
dest[0] = (dest[0] & ~mask) | ((OP(src[0])>>s) & mask); \
|
|
return; \
|
|
} \
|
|
if (nw == 1) { \
|
|
mask = (lomask(nbits)<<doffs); \
|
|
dest[0] = (dest[0] & ~mask) | \
|
|
(((OP(src[0])>>s)|(OP(src[1])<<(32-s))) & mask); \
|
|
return; \
|
|
} \
|
|
mask = ~lomask(doffs); \
|
|
dest[0] = (dest[0] & ~mask) | \
|
|
(((OP(src[0])>>s)|(OP(src[1])<<(32-s))) & mask); \
|
|
for(i=1; i < nw-1; i++) { \
|
|
dest[i] = (OP(src[i])>>s) | (OP(src[i+1])<<(32-s)); \
|
|
} \
|
|
tail = (doffs+nbits)&31; \
|
|
if (tail==0) { mask=ONES32; } else { mask = lomask(tail); } \
|
|
if (snw == nw) { \
|
|
dest[i] = (dest[i] & ~mask) | ((OP(src[i])>>s) & mask); \
|
|
} \
|
|
else /* snw > nw */ { \
|
|
dest[i] = (dest[i] & ~mask) | \
|
|
(((OP(src[i])>>s)|(OP(src[i+1])<<(32-s))) & mask); \
|
|
} \
|
|
} \
|
|
}
|
|
|
|
#define BV_COPY(a) (a)
|
|
#define BV_NOT(a) (~(a))
|
|
BITVECTOR_COPY_OP(copy, BV_COPY)
|
|
BITVECTOR_COPY_OP(not_to, BV_NOT)
|
|
|
|
// right-shift the bits in one logical "row" of a long 2d bit vector
|
|
/*
|
|
void bitvector_shr_row(u_int32_t *b, u_int32_t offs, size_t nbits, u_int32_t s)
|
|
{
|
|
}
|
|
*/
|
|
|
|
// copy from source to dest while reversing bit-order
|
|
// assumes dest offset == 0
|
|
// assumes source and dest don't overlap
|
|
// assumes offset < 32
|
|
void bitvector_reverse_to(u_int32_t *dest, u_int32_t *src, u_int32_t soffs,
|
|
u_int32_t nbits)
|
|
{
|
|
index_t i;
|
|
u_int32_t nw, tail;
|
|
|
|
if (nbits == 0) return;
|
|
|
|
nw = (soffs+nbits+31)>>5;
|
|
// first, reverse the words while reversing bit order within each word
|
|
for(i=0; i < nw/2; i++) {
|
|
dest[i] = bitreverse(src[nw-i-1]);
|
|
dest[nw-i-1] = bitreverse(src[i]);
|
|
}
|
|
if (nw&0x1)
|
|
dest[i] = bitreverse(src[i]);
|
|
|
|
tail = (soffs+nbits)&31;
|
|
if (tail)
|
|
bitvector_shr(dest, nw, 32-tail);
|
|
}
|
|
|
|
void bitvector_reverse(u_int32_t *b, u_int32_t offs, u_int32_t nbits)
|
|
{
|
|
index_t i;
|
|
u_int32_t nw, tail;
|
|
u_int32_t *temp;
|
|
|
|
if (nbits == 0) return;
|
|
|
|
nw = (offs+nbits+31)>>5;
|
|
temp = (nw > MALLOC_CUTOFF) ? malloc(nw*4) : alloca(nw*4);
|
|
for(i=0; i < nw/2; i++) {
|
|
temp[i] = bitreverse(b[nw-i-1]);
|
|
temp[nw-i-1] = bitreverse(b[i]);
|
|
}
|
|
if (nw&0x1)
|
|
temp[i] = bitreverse(b[i]);
|
|
|
|
tail = (offs+nbits)&31;
|
|
bitvector_copy(b, offs, temp, (32-tail)&31, nbits);
|
|
if (nw > MALLOC_CUTOFF) free(temp);
|
|
}
|
|
|
|
u_int64_t bitvector_count(u_int32_t *b, u_int32_t offs, u_int64_t nbits)
|
|
{
|
|
size_t i, nw;
|
|
u_int32_t ntail;
|
|
u_int64_t ans;
|
|
|
|
if (nbits == 0) return 0;
|
|
nw = ((u_int64_t)offs+nbits+31)>>5;
|
|
|
|
if (nw == 1) {
|
|
return count_bits(b[0] & (lomask(nbits)<<offs));
|
|
}
|
|
|
|
ans = count_bits(b[0]>>offs); // first end cap
|
|
|
|
for(i=1; i < nw-1; i++) {
|
|
/* popcnt can be computed branch-free, so these special cases
|
|
probably don't help much */
|
|
/*
|
|
v = b[i];
|
|
if (v == 0)
|
|
continue;
|
|
if (v == ONES32)
|
|
ans += 32;
|
|
else
|
|
*/
|
|
ans += count_bits(b[i]);
|
|
}
|
|
|
|
ntail = (offs+(u_int32_t)nbits)&31;
|
|
ans += count_bits(b[i]&(ntail>0?lomask(ntail):ONES32)); // last end cap
|
|
|
|
return ans;
|
|
}
|
|
|
|
u_int32_t bitvector_any0(u_int32_t *b, u_int32_t offs, u_int32_t nbits)
|
|
{
|
|
index_t i;
|
|
u_int32_t nw, tail;
|
|
u_int32_t mask;
|
|
|
|
if (nbits == 0) return 0;
|
|
nw = (offs+nbits+31)>>5;
|
|
|
|
if (nw == 1) {
|
|
mask = (lomask(nbits)<<offs);
|
|
if ((b[0] & mask) != mask) return 1;
|
|
return 0;
|
|
}
|
|
|
|
mask = ~lomask(offs);
|
|
if ((b[0] & mask) != mask) return 1;
|
|
|
|
for(i=1; i < nw-1; i++) {
|
|
if (b[i] != ONES32) return 1;
|
|
}
|
|
|
|
tail = (offs+nbits)&31;
|
|
if (tail==0) {
|
|
if (b[i] != ONES32) return 1;
|
|
}
|
|
else {
|
|
mask = lomask(tail);
|
|
if ((b[i] & mask) != mask) return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
u_int32_t bitvector_any1(u_int32_t *b, u_int32_t offs, u_int32_t nbits)
|
|
{
|
|
index_t i;
|
|
u_int32_t nw, tail;
|
|
u_int32_t mask;
|
|
|
|
if (nbits == 0) return 0;
|
|
nw = (offs+nbits+31)>>5;
|
|
|
|
if (nw == 1) {
|
|
mask = (lomask(nbits)<<offs);
|
|
if ((b[0] & mask) != 0) return 1;
|
|
return 0;
|
|
}
|
|
|
|
mask = ~lomask(offs);
|
|
if ((b[0] & mask) != 0) return 1;
|
|
|
|
for(i=1; i < nw-1; i++) {
|
|
if (b[i] != 0) return 1;
|
|
}
|
|
|
|
tail = (offs+nbits)&31;
|
|
if (tail==0) {
|
|
if (b[i] != 0) return 1;
|
|
}
|
|
else {
|
|
mask = lomask(tail);
|
|
if ((b[i] & mask) != 0) return 1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static void adjust_offset_to(u_int32_t *dest, u_int32_t *src, u_int32_t nw,
|
|
u_int32_t soffs, u_int32_t newoffs)
|
|
{
|
|
if (newoffs > soffs)
|
|
bitvector_shl_to(dest, src, nw, newoffs-soffs, true);
|
|
else
|
|
bitvector_shr_to(dest, src, nw, soffs-newoffs);
|
|
}
|
|
|
|
#define BITVECTOR_BINARY_OP_TO(opname, OP) \
|
|
void bitvector_##opname##_to(u_int32_t *dest, u_int32_t doffs, \
|
|
u_int32_t *a, u_int32_t aoffs, \
|
|
u_int32_t *b, u_int32_t boffs, u_int32_t nbits) \
|
|
{ \
|
|
u_int32_t nw = (doffs+nbits+31)>>5; \
|
|
u_int32_t *temp = nw>MALLOC_CUTOFF ? malloc((nw+1)*4) : alloca((nw+1)*4);\
|
|
u_int32_t i, anw, bnw; \
|
|
if (aoffs == boffs) { \
|
|
anw = (aoffs+nbits+31)>>5; \
|
|
} \
|
|
else if (aoffs == doffs) { \
|
|
bnw = (boffs+nbits+31)>>5; \
|
|
adjust_offset_to(temp, b, bnw, boffs, aoffs); \
|
|
b = temp; anw = nw; \
|
|
} \
|
|
else { \
|
|
anw = (aoffs+nbits+31)>>5; \
|
|
bnw = (boffs+nbits+31)>>5; \
|
|
adjust_offset_to(temp, a, anw, aoffs, boffs); \
|
|
a = temp; aoffs = boffs; anw = bnw; \
|
|
} \
|
|
for(i=0; i < anw; i++) temp[i] = OP(a[i], b[i]); \
|
|
bitvector_copy(dest, doffs, temp, aoffs, nbits); \
|
|
if (nw>MALLOC_CUTOFF) free(temp); \
|
|
}
|
|
|
|
#define BV_AND(a,b) ((a)&(b))
|
|
#define BV_OR(a,b) ((a)|(b))
|
|
#define BV_XOR(a,b) ((a)^(b))
|
|
BITVECTOR_BINARY_OP_TO(and, BV_AND)
|
|
BITVECTOR_BINARY_OP_TO(or, BV_OR)
|
|
BITVECTOR_BINARY_OP_TO(xor, BV_XOR)
|