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use much faster get_random_{type}_uniform approach

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Daniel Micay 2018-08-30 01:16:58 -04:00
parent 1c181557c7
commit 99fcddc223
3 changed files with 231 additions and 41 deletions
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@ -4,22 +4,6 @@ chacha.c is a simple conversion of chacha-merged.c to a keystream-only implement
D. J. Bernstein
Public domain.
random.c (get_random_u16_uniform, get_random_u64_uniform):
Copyright (c) 2008, Damien Miller <djm@openbsd.org>
Permission to use, copy, modify, and distribute this software for any
purpose with or without fee is hereby granted, provided that the above
copyright notice and this permission notice appear in all copies.
THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
malloc.c open-addressed hash table (regions_grow, regions_insert, regions_find, regions_delete):
Copyright (c) 2008, 2010, 2011, 2016 Otto Moerbeek <otto@drijf.net>
@ -66,3 +50,209 @@ libdivide:
FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
DEALINGS IN THE SOFTWARE.
random.c get_random_{type}_uniform functions:
Daniel Lemire
Apache License
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http://www.apache.org/licenses/
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2
Makefile
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@ -1,5 +1,5 @@
CPPFLAGS := -D_GNU_SOURCE
CFLAGS := -std=c11 -Wall -Wextra -O2 -flto -fPIC -fvisibility=hidden -pedantic -fno-plt
CFLAGS := -std=c11 -Wall -Wextra -O2 -flto -fPIC -fvisibility=hidden -fno-plt
LDFLAGS := -Wl,--as-needed,-z,defs,-z,relro,-z,now
LDLIBS := -lpthread
OBJECTS := chacha.o malloc.o memory.o random.o util.o

48
random.c
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@ -69,20 +69,20 @@ uint16_t get_random_u16(struct random_state *state) {
return value;
}
// based on OpenBSD arc4random_uniform
// See Fast Random Integer Generation in an Interval by Daniel Lemire
uint16_t get_random_u16_uniform(struct random_state *state, uint16_t bound) {
if (bound < 2) {
return 0;
uint32_t random = get_random_u16(state);
uint32_t multiresult = random * bound;
uint16_t leftover = multiresult;
if (leftover < bound) {
uint16_t threshold = -bound % bound;
while (leftover < threshold) {
random = get_random_u16(state);
multiresult = random * bound;
leftover = (uint16_t)multiresult;
}
uint16_t min = (uint16_t)-bound % bound;
uint16_t r;
do {
r = get_random_u16(state);
} while (unlikely(r < min));
return r % bound;
}
return multiresult >> 16;
}
uint64_t get_random_u64(struct random_state *state) {
@ -96,18 +96,18 @@ uint64_t get_random_u64(struct random_state *state) {
return value;
}
// based on OpenBSD arc4random_uniform
// See Fast Random Integer Generation in an Interval by Daniel Lemire
uint64_t get_random_u64_uniform(struct random_state *state, uint64_t bound) {
if (bound < 2) {
return 0;
unsigned __int128 random = get_random_u64(state);
unsigned __int128 multiresult = random * bound;
uint64_t leftover = multiresult;
if (leftover < bound) {
uint64_t threshold = -bound % bound;
while (leftover < threshold) {
random = get_random_u64(state);
multiresult = random * bound;
leftover = multiresult;
}
uint64_t min = -bound % bound;
uint64_t r;
do {
r = get_random_u64(state);
} while (unlikely(r < min));
return r % bound;
}
return multiresult >> 64;
}