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