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Add ip1 + 128 Prefetch; Tiny Cleanup

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This commit is contained in:
W. Felix Handte 2021-08-19 13:58:09 -04:00
parent 991d660ea9
commit 57a100f6dc
1 changed files with 13 additions and 11 deletions
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24
lib/compress/zstd_fast.c
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@ -295,7 +295,9 @@ _start: /* Requires: ip0 */
idx = hashTable[hash0]; idx = hashTable[hash0];
do { do {
/* load repcode match for ip[2]*/
const U32 rval = MEM_read32(ip2 - rep_offset1); const U32 rval = MEM_read32(ip2 - rep_offset1);
current0 = ip0 - base; current0 = ip0 - base;
/* write back hash table entry */ /* write back hash table entry */
@ -334,18 +336,18 @@ _start: /* Requires: ip0 */
/* lookup ip[1] */ /* lookup ip[1] */
idx = hashTable[hash0]; idx = hashTable[hash0];
/* advance to next positions */ /* calculate step */
{ if (ip1 >= nextStep) {
if (ip1 >= nextStep) { PREFETCH_L1(ip1 + 64);
PREFETCH_L1(ip1 + 64); PREFETCH_L1(ip1 + 128);
step++; step++;
nextStep += kStepIncr; nextStep += kStepIncr;
}
ip0 = ip1;
ip1 = ip2;
ip2 = ip2 + step;
} }
/* advance to next positions */
ip0 = ip1;
ip1 = ip2;
ip2 += step;
} while (ip2 < ilimit); } while (ip2 < ilimit);
_cleanup: _cleanup: