Hi Martin, Thanks for the reply! I checked the Api again and found the information you mentioned. And I found another way, which is(suppose value < 0): ref<ConstantExpr> value_expr = ConstantExpr::create(-value, 32); vv = vv.get() -> Neg(); It seems to work too, the value vv will be converted into the corresponding unsigned number.
Best, Zhongqiu Gao At 2019-10-21 23:47:34, "Nowack, Martin" <m.now...@imperial.ac.uk> wrote: Hi, In your case, use the `ConstantExpr::alloc()` method that takes an `llvm::APInt` as argument. There are several `APInt` constructors that allow to create arbitrary signed/unsigned integers (e.g. http://llvm.org/doxygen/classllvm_1_1APInt.html#a6286f2ba84c5ad11f4a90d57cb1dd293). Best, Martin On 19. Oct 2019, at 03:16, Zhongqiu Gao <zhongqiu_...@126.com> wrote: Hi, I am trying to do some concrete execution by adding a constraint to a path. I check the api of ConstantExpr::create(), and its argument should be an unsigned number. Is there a way to create a negative constant expression? Thanks, Zhongqiu Gao _______________________________________________ klee-dev mailing list klee-dev@imperial.ac.uk https://mailman.ic.ac.uk/mailman/listinfo/klee-dev
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