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use bdz_read.c

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This commit is contained in:
Motiejus Jakštys 2022-07-09 18:15:04 +03:00
parent ac71195144
commit eaa56ad32a
2 changed files with 83 additions and 2 deletions
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3
build.zig
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@ -48,8 +48,7 @@ pub fn build(b: *zbs.Builder) void {
bdz.setBuildMode(mode);
bdz.linkLibC();
bdz.addCSourceFiles(&.{
"deps/cmph/src/bdz.c",
"deps/cmph/src/bdz_ph.c",
"deps/bdz_read.c",
"deps/cmph/src/hash.c",
"deps/cmph/src/jenkins_hash.c",
}, &.{

82
deps/bdz_read.c vendored Executable file
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@ -0,0 +1,82 @@
/*
* this is a trimmed-down version of bdz.c with only "search".
*/
#include "bdz.h"
#include "cmph_structs.h"
#include "bdz_structs.h"
#include "bitbool.h"
#define UNASSIGNED 3U
// table used for looking up the number of assigned vertices a 8-bit integer
const cmph_uint8 bdz_lookup_table[] =
{
4, 4, 4, 3, 4, 4, 4, 3, 4, 4, 4, 3, 3, 3, 3, 2,
4, 4, 4, 3, 4, 4, 4, 3, 4, 4, 4, 3, 3, 3, 3, 2,
4, 4, 4, 3, 4, 4, 4, 3, 4, 4, 4, 3, 3, 3, 3, 2,
3, 3, 3, 2, 3, 3, 3, 2, 3, 3, 3, 2, 2, 2, 2, 1,
4, 4, 4, 3, 4, 4, 4, 3, 4, 4, 4, 3, 3, 3, 3, 2,
4, 4, 4, 3, 4, 4, 4, 3, 4, 4, 4, 3, 3, 3, 3, 2,
4, 4, 4, 3, 4, 4, 4, 3, 4, 4, 4, 3, 3, 3, 3, 2,
3, 3, 3, 2, 3, 3, 3, 2, 3, 3, 3, 2, 2, 2, 2, 1,
4, 4, 4, 3, 4, 4, 4, 3, 4, 4, 4, 3, 3, 3, 3, 2,
4, 4, 4, 3, 4, 4, 4, 3, 4, 4, 4, 3, 3, 3, 3, 2,
4, 4, 4, 3, 4, 4, 4, 3, 4, 4, 4, 3, 3, 3, 3, 2,
3, 3, 3, 2, 3, 3, 3, 2, 3, 3, 3, 2, 2, 2, 2, 1,
3, 3, 3, 2, 3, 3, 3, 2, 3, 3, 3, 2, 2, 2, 2, 1,
3, 3, 3, 2, 3, 3, 3, 2, 3, 3, 3, 2, 2, 2, 2, 1,
3, 3, 3, 2, 3, 3, 3, 2, 3, 3, 3, 2, 2, 2, 2, 1,
2, 2, 2, 1, 2, 2, 2, 1, 2, 2, 2, 1, 1, 1, 1, 0
};
static inline cmph_uint32 rank(cmph_uint32 b, cmph_uint32 * ranktable, cmph_uint8 * g, cmph_uint32 vertex)
{
register cmph_uint32 index = vertex >> b;
register cmph_uint32 base_rank = ranktable[index];
register cmph_uint32 beg_idx_v = index << b;
register cmph_uint32 beg_idx_b = beg_idx_v >> 2;
register cmph_uint32 end_idx_b = vertex >> 2;
while(beg_idx_b < end_idx_b)
{
base_rank += bdz_lookup_table[*(g + beg_idx_b++)];
}
beg_idx_v = beg_idx_b << 2;
while(beg_idx_v < vertex)
{
if(GETVALUE(g, beg_idx_v) != UNASSIGNED) base_rank++;
beg_idx_v++;
}
return base_rank;
}
/** cmph_uint32 bdz_search(void *packed_mphf, const char *key, cmph_uint32 keylen);
* \brief Use the packed mphf to do a search.
* \param packed_mphf pointer to the packed mphf
* \param key key to be hashed
* \param keylen key legth in bytes
* \return The mphf value
*/
cmph_uint32 bdz_search_packed(void *packed_mphf, const char *key, cmph_uint32 keylen)
{
register cmph_uint32 vertex;
register CMPH_HASH hl_type = (CMPH_HASH)(*(cmph_uint32 *)packed_mphf);
register cmph_uint8 *hl_ptr = (cmph_uint8 *)(packed_mphf) + 4;
register cmph_uint32 *ranktable = (cmph_uint32*)(hl_ptr + hash_state_packed_size(hl_type));
register cmph_uint32 r = *ranktable++;
register cmph_uint32 ranktablesize = *ranktable++;
register cmph_uint8 * g = (cmph_uint8 *)(ranktable + ranktablesize);
register cmph_uint8 b = *g++;
cmph_uint32 hl[3];
hash_vector_packed(hl_ptr, hl_type, key, keylen, hl);
hl[0] = hl[0] % r;
hl[1] = hl[1] % r + r;
hl[2] = hl[2] % r + (r << 1);
vertex = hl[(GETVALUE(g, hl[0]) + GETVALUE(g, hl[1]) + GETVALUE(g, hl[2])) % 3];
return rank(b, ranktable, g, vertex);
}