diff options
Diffstat (limited to 'lib')
| -rw-r--r-- | lib/Solver/MetaSMTBuilder.h | 13 |
1 files changed, 4 insertions, 9 deletions
diff --git a/lib/Solver/MetaSMTBuilder.h b/lib/Solver/MetaSMTBuilder.h index b073b57c..a66069a5 100644 --- a/lib/Solver/MetaSMTBuilder.h +++ b/lib/Solver/MetaSMTBuilder.h @@ -115,7 +115,7 @@ public: typename SolverContext::result_type bvLeftShift(typename SolverContext::result_type expr, unsigned width, unsigned shift); typename SolverContext::result_type bvRightShift(typename SolverContext::result_type expr, unsigned width, unsigned shift); typename SolverContext::result_type bvVarLeftShift(typename SolverContext::result_type expr, typename SolverContext::result_type shift, unsigned width); - typename SolverContext::result_type bvVarRightShift(typename SolverContext::result_type expr, typename SolverContext::result_type amount, unsigned width); + typename SolverContext::result_type bvVarRightShift(typename SolverContext::result_type expr, typename SolverContext::result_type shift, unsigned width); typename SolverContext::result_type bvVarArithRightShift(typename SolverContext::result_type expr, typename SolverContext::result_type amount, unsigned width); @@ -501,25 +501,20 @@ typename SolverContext::result_type MetaSMTBuilder<SolverContext>::bvVarLeftShif // logical right shift by a variable amount on an expression of the specified width template<typename SolverContext> -typename SolverContext::result_type MetaSMTBuilder<SolverContext>::bvVarRightShift(typename SolverContext::result_type expr, typename SolverContext::result_type amount, unsigned width) { +typename SolverContext::result_type MetaSMTBuilder<SolverContext>::bvVarRightShift(typename SolverContext::result_type expr, typename SolverContext::result_type shift, unsigned width) { typename SolverContext::result_type res = bvZero(width); - int shiftBits = getShiftBits(width); - - //get the shift amount (looking only at the bits appropriate for the given width) - typename SolverContext::result_type shift = bvExtract(amount, shiftBits - 1, 0); - //construct a big if-then-elif-elif-... with one case per possible shift amount for (int i = width - 1; i >= 0; i--) { - res = evaluate(_solver, metaSMT::logic::Ite(eqExpr(shift, bvConst32(shiftBits, i)), + res = evaluate(_solver, metaSMT::logic::Ite(eqExpr(shift, bvConst32(width, i)), bvRightShift(expr, width, i), res)); // ToDo Reconsider widht to provide to bvRightShift } // If overshifting, shift to zero - res = evaluate(_solver, metaSMT::logic::Ite(bvult(shift, bvConst32(shiftBits, width)), + res = evaluate(_solver, metaSMT::logic::Ite(bvult(shift, bvConst32(width, width)), res, bvZero(width))); |