diff options
| -rw-r--r-- | lib/Solver/MetaSMTBuilder.h | 2 | ||||
| -rw-r--r-- | lib/Solver/STPBuilder.cpp | 2 | ||||
| -rw-r--r-- | test/regression/2014-12-08-ashr.c | 29 |
3 files changed, 31 insertions, 2 deletions
diff --git a/lib/Solver/MetaSMTBuilder.h b/lib/Solver/MetaSMTBuilder.h index b5c99907..92b26926 100644 --- a/lib/Solver/MetaSMTBuilder.h +++ b/lib/Solver/MetaSMTBuilder.h @@ -284,7 +284,7 @@ typename SolverContext::result_type MetaSMTBuilder<SolverContext>::constructAShr if (shift == 0) { res = expr; } - else if (shift >= width - 1) { + else if (shift >= width) { res = evaluate(_solver, metaSMT::logic::Ite(isSigned, bvMinusOne(width), bvZero(width))); } else { diff --git a/lib/Solver/STPBuilder.cpp b/lib/Solver/STPBuilder.cpp index 34ce0ede..6d7dd8b7 100644 --- a/lib/Solver/STPBuilder.cpp +++ b/lib/Solver/STPBuilder.cpp @@ -283,7 +283,7 @@ ExprHandle STPBuilder::constructAShrByConstant(ExprHandle expr, if (shift==0) { return expr; - } else if (shift>=width-1) { + } else if (shift>=width) { return bvZero(width); // Overshift to zero } else { return vc_iteExpr(vc, diff --git a/test/regression/2014-12-08-ashr.c b/test/regression/2014-12-08-ashr.c new file mode 100644 index 00000000..3fe7f62b --- /dev/null +++ b/test/regression/2014-12-08-ashr.c @@ -0,0 +1,29 @@ +// RUN: %llvmgcc %s -emit-llvm -g -O0 -c -o %t.bc +// RUN: rm -rf %t.klee-out +// RUN: %klee --output-dir=%t.klee-out -exit-on-error %t.bc + +#include <assert.h> +#include <klee/klee.h> + +int f1(int a, int b) { + return a + b; +} + +int f2(int a, int b) { + int i; + for (i = 0; i < sizeof(b) * 8; i++) + a += (((b >> i) & 1) << i); + + return a; +} + +int main(int argc, char **argv) { + int a, b; + klee_make_symbolic(&a, sizeof(a), "a"); + klee_make_symbolic(&b, sizeof(b), "b"); + + klee_assert(f1(a, b) == f2(a, b)); + + return 0; +} + |