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igzip: Optimize reset hash table

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Change-Id: I380353ec846190acc87f19fd7660991e2db62010
Signed-off-by: Roy Oursler <roy.j.oursler@intel.com>
This commit is contained in:
Roy Oursler 2018-10-18 17:30:34 -07:00
parent 412abd81ea
commit 8a2be4b693
1 changed files with 26 additions and 6 deletions
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32
igzip/igzip.c
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@ -31,6 +31,7 @@
#include <assert.h>
#include <string.h>
#include <wchar.h>
#ifdef _WIN32
# include <intrin.h>
#endif
@ -881,7 +882,6 @@ static inline void reset_match_history(struct isal_zstream *stream)
struct level_buf *level_buf = (struct level_buf *)stream->level_buf;
uint16_t *hash_table;
uint32_t hash_table_size;
int i = 0;
hash_table_size = 2 * (state->hash_mask + 1);
@ -901,13 +901,33 @@ static inline void reset_match_history(struct isal_zstream *stream)
state->has_hist = IGZIP_NO_HIST;
if ((stream->total_in & 0xFFFF) == 0)
memset(hash_table, 0, hash_table_size);
else {
for (i = 0; i < hash_table_size / 2; i++) {
hash_table[i] = (uint16_t) (stream->total_in);
if (sizeof(wchar_t) >= 2) {
wchar_t hash_init_val;
int rep_bits;
/* There is definitely more than 16 bytes in the hash table. Set this
* minimum to avoid a wmemset of size 0 */
if (hash_table_size <= sizeof(wchar_t))
hash_table_size = sizeof(wchar_t);
hash_init_val = stream->total_in & 0xffff;
for (rep_bits = sizeof(uint16_t) * 8; rep_bits < sizeof(wchar_t) * 8;
rep_bits *= 2)
hash_init_val |= hash_init_val << rep_bits;
wmemset((wchar_t *) hash_table, hash_init_val,
hash_table_size / sizeof(wchar_t));
} else {
if ((stream->total_in & 0xFFFF) == 0)
memset(hash_table, 0, hash_table_size);
else {
int i;
for (i = 0; i < hash_table_size / 2; i++) {
hash_table[i] = (uint16_t) (stream->total_in);
}
}
}
}
static void inline set_dist_mask(struct isal_zstream *stream)