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Bug #2699

open

BLAST doesn't find an error in a rather simple example with division

Added by Evgeny Novikov over 12 years ago. Updated over 12 years ago.

Status:
New
Priority:
Normal
Assignee:
-
Category:
-
Target version:
-
Start date:
04/04/2012
Due date:
% Done:

0%

Estimated time:
Detected in build:
svn
Platform:
Published in build:

Description

CPAchecker finds it. The example with description in attachment.
In fact the example is a minimal test case (I guess) for a real driver that is also attached. On that driver BLAST quickly fails with the same error, while CPAchecker is killed because of time out of 15 minutes.

Files

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test.c (330 Bytes) test.c Example with division that fails BLAST Evgeny Novikov, 04/04/2012 03:04 PM
drivers-usb-class-cdc-acm.o.general.i (1.54 MB) drivers-usb-class-cdc-acm.o.general.i Real driver that has the same problem Evgeny Novikov, 04/04/2012 03:04 PM
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 #1

Updated by Pavel Shved over 12 years ago

CSIsat interpolating prover doesn't seem to support division. BLAST replaces the division by an uninterpreted function. So it can reason that if a==b then a/2 b/2, but it can't deduce that a1 from a1==2 && a==a1/2. CVC3, however, solves this correctly, and causes the SAT error.

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