Drop slides about proving power of 2 function.

[libguestfs-talks.git] / 2020-frama-c / 5100-power-of-2.html

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-<h1>nbdkit is_power_of_2</h1>
-
-<pre class="code">
-  /*@
-    predicate positive_power_of_2 (integer i) =
-      i > 0 &&
-      (i == 1 || ((i & 1) == 0 && positive_power_of_2 (i >> 1)));
-
-    lemma positive_power_of_2 (1);
-    lemma positive_power_of_2 (2);
-    lemma positive_power_of_2 (4);
-    lemma !positive_power_of_2 (7);
-   */
-</pre>
-
-<a href="https://stackoverflow.com/questions/64268418/how-do-i-write-an-is-power-of-2-predicate-in-acsl">https://stackoverflow.com/questions/64268418/how-do-i-write-an-is-power-of-2-predicate-in-acsl</a>