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Remove rtree support for 0 (NULL) keys.

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NULL can never actually be inserted in practice, and removing support
allows a branch to be removed from the fast path.
This commit is contained in:
Jason Evans 2017-02-05 02:50:59 -08:00
parent f5cf9b19c8
commit 650c070e10
3 changed files with 43 additions and 45 deletions
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18
src/rtree.c
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@ -170,17 +170,15 @@ rtree_elm_lookup_hard(tsdn_t *tsdn, rtree_t *rtree, rtree_ctx_t *rtree_ctx,
* node is a leaf, so it contains values rather than \
* child pointers. \
*/ \
if (likely(key != 0)) { \
if (RTREE_CTX_NCACHE > 1) { \
memmove(&rtree_ctx->cache[1], \
&rtree_ctx->cache[0], \
sizeof(rtree_ctx_cache_elm_t) * \
(RTREE_CTX_NCACHE-1)); \
} \
uintptr_t leafkey = rtree_leafkey(key); \
rtree_ctx->cache[0].leafkey = leafkey; \
rtree_ctx->cache[0].leaf = node; \
if (RTREE_CTX_NCACHE > 1) { \
memmove(&rtree_ctx->cache[1], \
&rtree_ctx->cache[0], \
sizeof(rtree_ctx_cache_elm_t) * \
(RTREE_CTX_NCACHE-1)); \
} \
uintptr_t leafkey = rtree_leafkey(key); \
rtree_ctx->cache[0].leafkey = leafkey; \
rtree_ctx->cache[0].leaf = node; \
uintptr_t subkey = rtree_subkey(key, level); \
return &node[subkey]; \
}