implement fneg instruction

1 files changed, 14 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");