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[Frama-c-discuss] Predicates with bitwise operators?

  • Subject: [Frama-c-discuss] Predicates with bitwise operators?
  • From: me at yifanlu.com (Yifan Lu)
  • Date: Thu, 27 Jul 2017 10:25:56 -0700
Hi,

I wrote the following

  //@ predicate is_power_2(integer x) = x >= 0 && ((x & (x-1)) == 0);

and I'm trying to test it (Typed+cint) with

  //@ assert is_power_2(2);
  //@ assert is_power_2(8);
  //@ assert is_power_2(4);
  //@ assert is_power_2(64);
  //@ assert !is_power_2(66);

Unfortunately, WP does not seem to find a proof for any of them. Any ideas?