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Simplify the logic in ph_insert

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Also fixes what looks like an off by one error in the lazy aux list
merge part of the code that previously never touched the last node in
the aux list.
This commit is contained in:
Amaury Séchet 2023-03-02 23:32:42 +00:00 committed by Qi Wang
parent 31e01a98f1
commit 543e2d61e6
1 changed files with 30 additions and 29 deletions
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13
include/jemalloc/internal/ph.h
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@ -318,7 +318,9 @@ ph_insert(ph_t *ph, void *phn, size_t offset, ph_cmp_t cmp) {
*/ */
if (ph->root == NULL) { if (ph->root == NULL) {
ph->root = phn; ph->root = phn;
} else { return;
}
/* /*
* As a special case, check to see if we can replace the root. * As a special case, check to see if we can replace the root.
* This is practically common in some important cases, and lets * This is practically common in some important cases, and lets
@ -333,7 +335,7 @@ ph_insert(ph_t *ph, void *phn, size_t offset, ph_cmp_t cmp) {
ph->auxcount = 0; ph->auxcount = 0;
return; return;
} }
ph->auxcount++;
phn_next_set(phn, phn_next_get(ph->root, offset), offset); phn_next_set(phn, phn_next_get(ph->root, offset), offset);
if (phn_next_get(ph->root, offset) != NULL) { if (phn_next_get(ph->root, offset) != NULL) {
phn_prev_set(phn_next_get(ph->root, offset), phn, phn_prev_set(phn_next_get(ph->root, offset), phn,
@ -341,14 +343,13 @@ ph_insert(ph_t *ph, void *phn, size_t offset, ph_cmp_t cmp) {
} }
phn_prev_set(phn, ph->root, offset); phn_prev_set(phn, ph->root, offset);
phn_next_set(ph->root, phn, offset); phn_next_set(ph->root, phn, offset);
}
if (ph->auxcount > 1) { ph->auxcount++;
unsigned nmerges = ffs_zu(ph->auxcount - 1); unsigned nmerges = ffs_zu(ph->auxcount);
bool done = false; bool done = false;
for (unsigned i = 0; i < nmerges && !done; i++) { for (unsigned i = 0; i < nmerges && !done; i++) {
done = ph_try_aux_merge_pair(ph, offset, cmp); done = ph_try_aux_merge_pair(ph, offset, cmp);
} }
}
} }
JEMALLOC_ALWAYS_INLINE void * JEMALLOC_ALWAYS_INLINE void *