https://github.com/EasyCrypt/easycrypt
Revision 3f4a0bd5596888cd8d28b97687d477942187aa5f authored by Pierre-Yves Strub on 11 June 2022, 06:10:21 UTC, committed by Adrien Koutsos on 13 June 2022, 09:22:31 UTC
Loops' epilogs must now be deterministic and loop/calls-free.
This forbids the following unsoundness:
```
require import AllCore DBool.
module E = {
var i,j : int
proc foo () = {
var c;
i <- 0;
j <- 0;
c <- false;
while (!c) {
i <- i + 1;
j <- j + 1;
c <$ {0,1};
}
return i = j;
}
proc bar () = {
var c;
i <- 0;
j <- 0;
c <- false;
while (!c) {
i <- i + 1;
c <$ {0,1};
}
c <- false;
while (!c) {
j <- j + 1;
c <$ {0,1};
}
return i = j;
}
}.
equiv bad : E.foo ~ E.bar : true ==> ={res}.
proof.
proc.
fission{1} 4!1 @1,2. by sim.
qed.
```
Fix #210
1 parent b9af81d
Tip revision: 3f4a0bd5596888cd8d28b97687d477942187aa5f authored by Pierre-Yves Strub on 11 June 2022, 06:10:21 UTC
In loop fusion/fission, add more constraints on the epilog
In loop fusion/fission, add more constraints on the epilog
Tip revision: 3f4a0bd
dune-project
(lang dune 2.8)
(using menhir 2.0)
(using dune_site 0.1)
(wrapped_executables false)
(name easycrypt)
(generate_opam_files true)
(package
(name easycrypt)
(sites (lib theories))
(depends
(ocaml (>= 4.08.0))
(batteries (>= 3))
camlzip
dune-build-info
dune-site
(ocaml-inifiles (>= 1.2))
(pcre (>= 7))
(why3 (and (>= 1.5.0) (< 1.6)))
yojson
(zarith (>= 1.10))
))
Computing file changes ...
