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[Frama-c-discuss] Problem with Jessie and float division

  • Subject: [Frama-c-discuss] Problem with Jessie and float division
  • From: hollas at informatik.htw-dresden.de (Boris Hollas)
  • Date: Mon, 08 Oct 2012 11:05:22 +0200
Hello,

the code below doesn't verify with Jessie because 0.8 * x > 0.0 can't be 
verified.

#pragma JessieFloatModel(math)

//@ requires 1 <= x < 10;
void foo(int x) {
   double y = 1.0 / (0.8 * x);
}


If I add
//@ lemma pos: \forall integer x; x > 0 ==> 0.8 * x > 0.0;
then this lemma can't be verified. This happens with Alt-Ergo and 
Simplify and both the why2 and the why3-backend.
-- 
Best regards,
Boris