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[Frama-c-discuss] Proving a simple property on bitshift with WP
- Subject: [Frama-c-discuss] Proving a simple property on bitshift with WP
- From: dmentre at linux-france.org (David MENTRE)
- Date: Thu, 29 Aug 2013 10:46:45 +0200
Hello, I would like to prove the property "m[bit] == ((unsigned char)1 << (7-(n%8)))" in the following program using WP but I am currently failing doing so. Any suggestion to help me prove it? I run WP with: frama-c-gui -wp -wp-rte q1_bitshift.c I have tried to use a more detailed memory model with "-wp-model "Typed,int" " without success. I am using Frama-C Fluorine 20130501, Why3 0.81 and Alt-Ergo 0.95.1. === static unsigned char m[] = { (1 << 7), (1 << 6), (1 << 5), (1 << 4), (1 << 3), (1 << 2), (1 << 1), (1 << 0) }; /*@ requires n >= 0; */ int main(int n) { int size, bit; size = 8; bit = n%size; //@ assert 0 <= bit <= 7; //@ assert m[0] == ((unsigned char)(1 << 7)); //@ assert m[bit] == ((unsigned char)1 << (7-(n%8))); return 0; } ===== Best regards, david
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