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mdbx: add simple SORT_CMP_SWAP() macro for MDBX_HAVE_CMOV=0 case.

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Леонид Юрьев (Leonid Yuriev) 2022-07-27 20:46:10 +03:00
parent 480dc2531e
commit d28110373e
1 changed files with 11 additions and 0 deletions
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11
src/core.c
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@ -1872,6 +1872,7 @@ static int lcklist_detach_locked(MDBX_env *env) {
* and network-sort for small chunks.
* Thanks to John M. Gamble for the http://pages.ripco.net/~jgamble/nw.html */
#if MDBX_HAVE_CMOV
#define SORT_CMP_SWAP(TYPE, CMP, a, b) \
do { \
const TYPE swap_tmp = (a); \
@ -1879,6 +1880,16 @@ static int lcklist_detach_locked(MDBX_env *env) {
(a) = swap_cmp ? swap_tmp : b; \
(b) = swap_cmp ? b : swap_tmp; \
} while (0)
#else
#define SORT_CMP_SWAP(TYPE, CMP, a, b) \
do \
if (!CMP(a, b)) { \
const TYPE swap_tmp = (a); \
(a) = (b); \
(b) = swap_tmp; \
} \
while (0)
#endif
// 3 comparators, 3 parallel operations
// o-----^--^--o