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| author | Julian Büning <julian.buening@comsys.rwth-aachen.de> | 2020-09-18 18:14:56 +0200 |
|---|---|---|
| committer | Cristian Cadar <c.cadar@imperial.ac.uk> | 2020-10-09 21:46:06 +0100 |
| commit | 0769caf8bbf0bc6ea3c681e5af7d79291fae2e2f (patch) | |
| tree | b8f06e501c5b9e8e1554a43c95d4ca092fdcb9a8 | |
| parent | 6e0209e74ef814aa27af2add01d22284817c3d73 (diff) | |
| download | klee-0769caf8bbf0bc6ea3c681e5af7d79291fae2e2f.tar.gz | |
implement fneg instruction
| -rw-r--r-- | lib/Core/Executor.cpp | 14 | ||||
| -rw-r--r-- | test/Feature/FNeg.ll | 19 |
2 files changed, 33 insertions, 0 deletions
diff --git a/lib/Core/Executor.cpp b/lib/Core/Executor.cpp index 7fac4fa4..de35710f 100644 --- a/lib/Core/Executor.cpp +++ b/lib/Core/Executor.cpp @@ -2465,6 +2465,20 @@ void Executor::executeInstruction(ExecutionState &state, KInstruction *ki) { // Floating point instructions +#if LLVM_VERSION_CODE >= LLVM_VERSION(8, 0) + case Instruction::FNeg: { + ref<ConstantExpr> arg = + toConstant(state, eval(ki, 0, state).value, "floating point"); + if (!fpWidthToSemantics(arg->getWidth())) + return terminateStateOnExecError(state, "Unsupported FNeg operation"); + + llvm::APFloat Res(*fpWidthToSemantics(arg->getWidth()), arg->getAPValue()); + Res = llvm::neg(Res); + bindLocal(ki, state, ConstantExpr::alloc(Res.bitcastToAPInt())); + break; + } +#endif + case Instruction::FAdd: { ref<ConstantExpr> left = toConstant(state, eval(ki, 0, state).value, "floating point"); diff --git a/test/Feature/FNeg.ll b/test/Feature/FNeg.ll new file mode 100644 index 00000000..cdea6aaa --- /dev/null +++ b/test/Feature/FNeg.ll @@ -0,0 +1,19 @@ +; REQUIRES: geq-llvm-8.0 +; RUN: %llvmas %s -o %t.bc +; RUN: rm -rf %t.klee-out +; RUN: %klee -exit-on-error -output-dir=%t.klee-out -optimize=false %t.bc + +define i32 @main() { + %1 = fneg double 2.000000e-01 + %2 = fcmp oeq double %1, -2.000000e-01 + br i1 %2, label %success, label %fail + +success: + ret i32 0 + +fail: + call void @abort() + unreachable +} + +declare void @abort() noreturn nounwind |