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Refactor prng* from cpp macros into inline functions.

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Remove 32-bit variant, convert prng64() to prng_lg_range(), and add
prng_range().
This commit is contained in:
Jason Evans
2016-02-09 16:28:40 -08:00
committed by Jason Evans
parent c87ab25d18
commit 34676d3369
12 changed files with 205 additions and 69 deletions
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4
src/ckh.c
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@@ -99,7 +99,7 @@ ckh_try_bucket_insert(ckh_t *ckh, size_t bucket, const void *key,
* Cycle through the cells in the bucket, starting at a random position.
* The randomness avoids worst-case search overhead as buckets fill up.
*/
prng32(offset, LG_CKH_BUCKET_CELLS, ckh->prng_state, CKH_A, CKH_C);
offset = prng_lg_range(&ckh->prng_state, LG_CKH_BUCKET_CELLS);
for (i = 0; i < (ZU(1) << LG_CKH_BUCKET_CELLS); i++) {
cell = &ckh->tab[(bucket << LG_CKH_BUCKET_CELLS) +
((i + offset) & ((ZU(1) << LG_CKH_BUCKET_CELLS) - 1))];
@@ -141,7 +141,7 @@ ckh_evict_reloc_insert(ckh_t *ckh, size_t argbucket, void const **argkey,
* were an item for which both hashes indicated the same
* bucket.
*/
prng32(i, LG_CKH_BUCKET_CELLS, ckh->prng_state, CKH_A, CKH_C);
i = prng_lg_range(&ckh->prng_state, LG_CKH_BUCKET_CELLS);
cell = &ckh->tab[(bucket << LG_CKH_BUCKET_CELLS) + i];
assert(cell->key != NULL);