use much faster get_random_{type}_uniform approach
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CREDITS
@ -4,22 +4,6 @@ chacha.c is a simple conversion of chacha-merged.c to a keystream-only implement
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D. J. Bernstein
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Public domain.
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random.c (get_random_u16_uniform, get_random_u64_uniform):
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Copyright (c) 2008, Damien Miller <djm@openbsd.org>
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Permission to use, copy, modify, and distribute this software for any
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purpose with or without fee is hereby granted, provided that the above
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copyright notice and this permission notice appear in all copies.
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THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
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WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
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MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
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ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
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WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
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ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
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OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
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malloc.c open-addressed hash table (regions_grow, regions_insert, regions_find, regions_delete):
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Copyright (c) 2008, 2010, 2011, 2016 Otto Moerbeek <otto@drijf.net>
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@ -66,3 +50,209 @@ libdivide:
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FOR ANY DAMAGES OR OTHER LIABILITY, WHETHER IN CONTRACT, TORT OR OTHERWISE,
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ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
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DEALINGS IN THE SOFTWARE.
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random.c get_random_{type}_uniform functions:
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Daniel Lemire
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Apache License
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Version 2.0, January 2004
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http://www.apache.org/licenses/
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2
Makefile
2
Makefile
@ -1,5 +1,5 @@
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CPPFLAGS := -D_GNU_SOURCE
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CFLAGS := -std=c11 -Wall -Wextra -O2 -flto -fPIC -fvisibility=hidden -pedantic -fno-plt
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CFLAGS := -std=c11 -Wall -Wextra -O2 -flto -fPIC -fvisibility=hidden -fno-plt
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LDFLAGS := -Wl,--as-needed,-z,defs,-z,relro,-z,now
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LDLIBS := -lpthread
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OBJECTS := chacha.o malloc.o memory.o random.o util.o
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48
random.c
48
random.c
@ -69,20 +69,20 @@ uint16_t get_random_u16(struct random_state *state) {
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return value;
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}
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// based on OpenBSD arc4random_uniform
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// See Fast Random Integer Generation in an Interval by Daniel Lemire
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uint16_t get_random_u16_uniform(struct random_state *state, uint16_t bound) {
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if (bound < 2) {
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return 0;
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uint32_t random = get_random_u16(state);
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uint32_t multiresult = random * bound;
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uint16_t leftover = multiresult;
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if (leftover < bound) {
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uint16_t threshold = -bound % bound;
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while (leftover < threshold) {
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random = get_random_u16(state);
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multiresult = random * bound;
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leftover = (uint16_t)multiresult;
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}
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}
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uint16_t min = (uint16_t)-bound % bound;
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uint16_t r;
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do {
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r = get_random_u16(state);
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} while (unlikely(r < min));
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return r % bound;
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return multiresult >> 16;
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}
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uint64_t get_random_u64(struct random_state *state) {
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@ -96,18 +96,18 @@ uint64_t get_random_u64(struct random_state *state) {
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return value;
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}
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// based on OpenBSD arc4random_uniform
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// See Fast Random Integer Generation in an Interval by Daniel Lemire
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uint64_t get_random_u64_uniform(struct random_state *state, uint64_t bound) {
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if (bound < 2) {
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return 0;
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unsigned __int128 random = get_random_u64(state);
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unsigned __int128 multiresult = random * bound;
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uint64_t leftover = multiresult;
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if (leftover < bound) {
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uint64_t threshold = -bound % bound;
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while (leftover < threshold) {
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random = get_random_u64(state);
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multiresult = random * bound;
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leftover = multiresult;
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}
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}
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uint64_t min = -bound % bound;
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uint64_t r;
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do {
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r = get_random_u64(state);
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} while (unlikely(r < min));
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return r % bound;
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return multiresult >> 64;
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}
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