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tests/qtest/npcm7xx_rng-test: count runs properly

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The number of runs is equal to the number of 0-1 and 1-0 transitions,
plus one. Currently, it's counting the number of times these transitions
do _not_ happen, plus one.

Source:
https://nvlpubs.nist.gov/nistpubs/Legacy/SP/nistspecialpublication800-22r1a.pdf
section 2.3.4 point (3).

Signed-off-by: Havard Skinnemoen <hskinnemoen@google.com>
Message-id: 20201103011457.2959989-2-hskinnemoen@google.com
Reviewed-by: Peter Maydell <peter.maydell@linaro.org>
Signed-off-by: Peter Maydell <peter.maydell@linaro.org>
This commit is contained in:
Havard Skinnemoen 2020-11-02 17:14:55 -08:00 committed by Peter Maydell
parent 0e5dc77573
commit 8006c9842b
1 changed files with 1 additions and 1 deletions
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2
tests/qtest/npcm7xx_rng-test.c
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@ -126,7 +126,7 @@ static double calc_runs_p(const unsigned long *buf, unsigned int nr_bits)
pi = (double)nr_ones / nr_bits;
for (k = 0; k < nr_bits - 1; k++) {
vn_obs += !(test_bit(k, buf) ^ test_bit(k + 1, buf));
vn_obs += (test_bit(k, buf) ^ test_bit(k + 1, buf));
}
vn_obs += 1;