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PRNG: Allow a a range argument of 1.

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This is convenient when the range argument itself is generated from some
computation whose value we don't know in advance.
This commit is contained in:
David Goldblatt 2020-08-13 18:02:25 -07:00 committed by David Goldblatt
parent bdb60a8053
commit 0513047170
1 changed files with 9 additions and 3 deletions
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12
include/jemalloc/internal/prng.h
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@ -133,7 +133,9 @@ prng_range_u32(atomic_u32_t *state, uint32_t range, bool atomic) {
uint32_t ret; uint32_t ret;
unsigned lg_range; unsigned lg_range;
assert(range > 1); if (range == 1) {
return 0;
}
/* Compute the ceiling of lg(range). */ /* Compute the ceiling of lg(range). */
lg_range = ffs_u32(pow2_ceil_u32(range)); lg_range = ffs_u32(pow2_ceil_u32(range));
@ -151,7 +153,9 @@ prng_range_u64(uint64_t *state, uint64_t range) {
uint64_t ret; uint64_t ret;
unsigned lg_range; unsigned lg_range;
assert(range > 1); if (range == 1) {
return 0;
}
/* Compute the ceiling of lg(range). */ /* Compute the ceiling of lg(range). */
lg_range = ffs_u64(pow2_ceil_u64(range)); lg_range = ffs_u64(pow2_ceil_u64(range));
@ -169,7 +173,9 @@ prng_range_zu(atomic_zu_t *state, size_t range, bool atomic) {
size_t ret; size_t ret;
unsigned lg_range; unsigned lg_range;
assert(range > 1); if (range == 1) {
return 0;
}
/* Compute the ceiling of lg(range). */ /* Compute the ceiling of lg(range). */
lg_range = ffs_u64(pow2_ceil_u64(range)); lg_range = ffs_u64(pow2_ceil_u64(range));