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borrow cache prefetching tricks from the Marvell port, seem to improve performance by 5-28%

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Konstantinos Margaritis
2021-01-15 17:42:11 +02:00
parent 77996c35fe
commit 65c4a58e0f
4 changed files with 37 additions and 7 deletions
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7
src/nfa/shufti.c
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@@ -109,7 +109,8 @@ DUMP_MSK(128)
#endif
#define GET_LO_4(chars) and128(chars, low4bits)
#define GET_HI_4(chars) rshift64_m128(andnot128(low4bits, chars), 4)
#define GET_HI_4(chars) and128(rshift64_m128(chars, 4), low4bits)
//#define GET_HI_4(chars) rshift64_m128(andnot128(low4bits, chars), 4)
static really_inline
u32 block(m128 mask_lo, m128 mask_hi, m128 chars, const m128 low4bits,
@@ -177,6 +178,10 @@ const u8 *shuftiExec(m128 mask_lo, m128 mask_hi, const u8 *buf,
// Reroll FTW.
const u8 *last_block = buf_end - 16;
for (const u8 *itPtr = buf; itPtr + 4*16 <= last_block; itPtr += 4*16) {
__builtin_prefetch(itPtr);
}
while (buf < last_block) {
m128 lchars = load128(buf);
rv = fwdBlock(mask_lo, mask_hi, lchars, buf, low4bits, zeroes);