project-base/server-skynet-source-3rd-jemalloc
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Consolidate the two memory loads in rtree_szind_slab_read().

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szind and slab bits are read on fast path, where compiler generated two memory
loads separately for them before this diff.  Manually operate on the bits to
avoid the extra memory load.
This commit is contained in:
Qi Wang 2018-04-05 14:37:17 -07:00 committed by Qi Wang
parent 5f51882a0a
commit 4be74d5112
1 changed files with 6 additions and 0 deletions
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6
include/jemalloc/internal/rtree.h
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@ -460,8 +460,14 @@ rtree_szind_slab_read(tsdn_t *tsdn, rtree_t *rtree, rtree_ctx_t *rtree_ctx,
if (!dependent && elm == NULL) {
return true;
}
#ifdef RTREE_LEAF_COMPACT
uintptr_t bits = rtree_leaf_elm_bits_read(tsdn, rtree, elm, dependent);
*r_szind = rtree_leaf_elm_bits_szind_get(bits);
*r_slab = rtree_leaf_elm_bits_slab_get(bits);
#else
*r_szind = rtree_leaf_elm_szind_read(tsdn, rtree, elm, dependent);
*r_slab = rtree_leaf_elm_slab_read(tsdn, rtree, elm, dependent);
#endif
return false;
}