Hi, there is some overlap between those two options, and in general things are not that well documented, so the best reference is the code. I'll try to take a closer look at this once I have some time. In the meantime, you may want to open a new issue on GitHub.

Best,
Cristian

On 12/05/15 06:53, Zhiyi Zhang wrote:
Hi, Rizzi

Thank you for your reply.

I have read the file in
https://github.com/klee/klee/commit/f0de5e4ea4f1bed2e698ae99a19f1f0b96770f9c,
but I am confused that this file seems also to be used for constraint
set simplification optimization. Does expression rewrite
optimization and constraint set simplification optimization have
combined in the new version? And the option is --rewrite-equalities and
--equality-substitution?

Best wishes.
Zhiyi Zhang

On Mon, May 11, 2015 at 7:54 PM, Eric Rizzi <[email protected]
<mailto:[email protected]>> wrote:

    There should be a --rewrite-equalities option per the following commit

    https://github.com/klee/klee/commit/f0de5e4ea4f1bed2e698ae99a19f1f0b96770f9c

    The default behavior is on anyways, though.

    On Mon, May 11, 2015 at 3:02 AM, Zhiyi Zhang
    <[email protected] <mailto:[email protected]>> wrote:

        Hi all,

        When I used klee with llvm3.4, I found that there is no
        "--rewrite" option in klee orders. So how could I use expression
          rewrite optimization  when I use klee running a program?

        Thank you.
        Zhiyi Zhang

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