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hllSparseAdd(): faster code removing conditional.

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Bottleneck found profiling. Big run time improvement found when testing
after the change.
This commit is contained in:
antirez 2014-04-14 12:58:46 +02:00
parent 4e0a99ba51
commit db40da0a47
1 changed files with 14 additions and 5 deletions
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19
src/hyperloglog.c
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@ -202,7 +202,7 @@ struct hllhdr {
#define HLL_SPARSE 1 /* Sparse encoding */
#define HLL_MAX_ENCODING 1
#define HLL_SPARSE_MAX 3000
#define HLL_SPARSE_MAX 12000
/* =========================== Low level bit macros ========================= */
@ -663,14 +663,23 @@ int hllSparseAdd(robj *o, unsigned char *ele, size_t elesize) {
next = NULL; /* Points to the next opcode at the end of the loop. */
span = 0;
while(p < end) {
int oplen;
/* Set span to the number of registers covered by this opcode. */
if (HLL_SPARSE_IS_ZERO(p)) span = HLL_SPARSE_ZERO_LEN(p);
else if (HLL_SPARSE_IS_XZERO(p)) span = HLL_SPARSE_XZERO_LEN(p);
else span = HLL_SPARSE_VAL_LEN(p);
if (HLL_SPARSE_IS_ZERO(p)) {
span = HLL_SPARSE_ZERO_LEN(p);
oplen = 1;
} else if (HLL_SPARSE_IS_XZERO(p)) {
span = HLL_SPARSE_XZERO_LEN(p);
oplen = 2;
} else {
span = HLL_SPARSE_VAL_LEN(p);
oplen = 1;
}
/* Break if this opcode covers the register as 'index'. */
if (index <= first+span-1) break;
prev = p;
p += (HLL_SPARSE_IS_XZERO(p)) ? 2 : 1;
p += oplen;
first += span;
}
if (span == 0) return -1; /* Invalid format. */