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prefetch works best when addresses are 64-byte aligned

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This commit is contained in:
Konstantinos Margaritis
2021-03-12 10:10:53 +02:00
parent 53a3e33204
commit 40531ad6e5
6 changed files with 26 additions and 22 deletions
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18
src/nfa/mcsheng.c
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@@ -889,10 +889,11 @@ char nfaExecMcSheng16_Q2i(const struct NFA *n, u64a offset, const u8 *buffer,
return MO_ALIVE;
}
__builtin_prefetch(&m->remap[0]);
__builtin_prefetch(&m->remap[64]);
__builtin_prefetch(&m->remap[128]);
__builtin_prefetch(&m->remap[192]);
const u8 *base = ROUNDDOWN_PTR(&m->remap[0], 64);
__builtin_prefetch(base);
__builtin_prefetch(base + 64);
__builtin_prefetch(base + 128);
__builtin_prefetch(base + 192);
while (1) {
assert(q->cur < q->end);
@@ -1022,10 +1023,11 @@ char nfaExecMcSheng8_Q2i(const struct NFA *n, u64a offset, const u8 *buffer,
return MO_ALIVE;
}
__builtin_prefetch(&m->remap[0]);
__builtin_prefetch(&m->remap[64]);
__builtin_prefetch(&m->remap[128]);
__builtin_prefetch(&m->remap[192]);
const u8 *base = ROUNDDOWN_PTR(&m->remap[0], 64);
__builtin_prefetch(base);
__builtin_prefetch(base + 64);
__builtin_prefetch(base + 128);
__builtin_prefetch(base + 192);
while (1) {
DEBUG_PRINTF("%s @ %llu\n", q->items[q->cur].type == MQE_TOP ? "TOP" :