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mdbx: оптимизация pnl_merge() для случаев неперекрывающихся объединяемых списков.

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Леонид Юрьев (Leonid Yuriev) 2022-11-29 02:35:42 +03:00
parent b7734369a2
commit 2776480f18
1 changed files with 15 additions and 2 deletions
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17
src/core.c
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@ -2451,8 +2451,21 @@ __hot static size_t pnl_merge(MDBX_PNL dst, const MDBX_PNL src) {
if (likely(src_len > 0)) { if (likely(src_len > 0)) {
total += src_len; total += src_len;
assert(MDBX_PNL_ALLOCLEN(dst) >= total); assert(MDBX_PNL_ALLOCLEN(dst) >= total);
dst[0] = /* the detent */ (MDBX_PNL_ASCENDING ? 0 : P_INVALID); if (!MDBX_DEBUG && total < (MDBX_HAVE_CMOV ? 21 : 12))
pnl_merge_inner(dst + total, dst + dst_len, src + src_len, src); goto avoid_call_libc_for_short_cases;
if (dst_len == 0 ||
MDBX_PNL_ORDERED(MDBX_PNL_LAST(dst), MDBX_PNL_FIRST(src)))
memcpy(MDBX_PNL_END(dst), MDBX_PNL_BEGIN(src), src_len * sizeof(pgno_t));
else if (MDBX_PNL_ORDERED(MDBX_PNL_LAST(src), MDBX_PNL_FIRST(dst))) {
memmove(MDBX_PNL_BEGIN(dst) + src_len, MDBX_PNL_BEGIN(dst),
dst_len * sizeof(pgno_t));
memcpy(MDBX_PNL_BEGIN(dst), MDBX_PNL_BEGIN(src),
src_len * sizeof(pgno_t));
} else {
avoid_call_libc_for_short_cases:
dst[0] = /* the detent */ (MDBX_PNL_ASCENDING ? 0 : P_INVALID);
pnl_merge_inner(dst + total, dst + dst_len, src + src_len, src);
}
MDBX_PNL_SETSIZE(dst, total); MDBX_PNL_SETSIZE(dst, total);
} }
assert(pnl_check_allocated(dst, MAX_PAGENO + 1)); assert(pnl_check_allocated(dst, MAX_PAGENO + 1));