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#include "test/jemalloc_test.h"
TEST_BEGIN(test_prng_lg_range)
{
uint64_t sa, sb, ra, rb;
unsigned lg_range;
sa = 42;
ra = prng_lg_range(&sa, 64);
sa = 42;
rb = prng_lg_range(&sa, 64);
assert_u64_eq(ra, rb,
"Repeated generation should produce repeated results");
sb = 42;
rb = prng_lg_range(&sb, 64);
assert_u64_eq(ra, rb,
"Equivalent generation should produce equivalent results");
sa = 42;
ra = prng_lg_range(&sa, 64);
rb = prng_lg_range(&sa, 64);
assert_u64_ne(ra, rb,
"Full-width results must not immediately repeat");
sa = 42;
ra = prng_lg_range(&sa, 64);
for (lg_range = 63; lg_range > 0; lg_range--) {
sb = 42;
rb = prng_lg_range(&sb, lg_range);
assert_u64_eq((rb & (UINT64_C(0xffffffffffffffff) << lg_range)),
0, "High order bits should be 0, lg_range=%u", lg_range);
assert_u64_eq(rb, (ra >> (64 - lg_range)),
"Expected high order bits of full-width result, "
"lg_range=%u", lg_range);
}
}
TEST_END
TEST_BEGIN(test_prng_range)
{
uint64_t range;
#define MAX_RANGE 10000000
#define RANGE_STEP 97
#define NREPS 10
for (range = 2; range < MAX_RANGE; range += RANGE_STEP) {
uint64_t s;
unsigned rep;
s = range;
for (rep = 0; rep < NREPS; rep++) {
uint64_t r = prng_range(&s, range);
assert_u64_lt(r, range, "Out of range");
}
}
}
TEST_END
int
main(void)
{
return (test(
test_prng_lg_range,
test_prng_range));
}
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