[ExecutionEngine] Add UnaryOperator visitor to the interpreter

This is to support the unary FNeg instruction.

Differential Revision: https://reviews.llvm.org/D62881

llvm-svn: 362941

2 files changed, 53 insertions, 0 deletions

diff --git a/llvm/lib/ExecutionEngine/Interpreter/Execution.cpp b/llvm/lib/ExecutionEngine/Interpreter/Execution.cpp
index 170f0155e5b..67180f2c21f 100644
--- a/llvm/lib/ExecutionEngine/Interpreter/Execution.cpp
+++ b/llvm/lib/ExecutionEngine/Interpreter/Execution.cpp
@@ -43,6 +43,58 @@ static void SetValue(Value *V, GenericValue Val, ExecutionContext &SF) {
 }
 
 //===----------------------------------------------------------------------===//
+//                    Unary Instruction Implementations
+//===----------------------------------------------------------------------===//
+
+static void executeFNegInst(GenericValue &Dest, GenericValue Src, Type *Ty) {
+  switch (Ty->getTypeID()) {
+  case Type::FloatTyID:
+    Dest.FloatVal = -Src.FloatVal;
+  case Type::DoubleTyID:
+    Dest.DoubleVal = -Src.DoubleVal;
+  default:
+    llvm_unreachable("Unhandled type for FNeg instruction");
+  }
+}
+
+void Interpreter::visitUnaryOperator(UnaryOperator &I) {
+  ExecutionContext &SF = ECStack.back();
+  Type *Ty = I.getOperand(0)->getType();
+  GenericValue Src = getOperandValue(I.getOperand(0), SF);
+  GenericValue R; // Result
+
+  // First process vector operation
+  if (Ty->isVectorTy()) {
+    R.AggregateVal.resize(Src.AggregateVal.size());
+
+    switch(I.getOpcode()) {
+    default:
+      llvm_unreachable("Don't know how to handle this unary operator");
+      break;
+    case Instruction::FNeg:
+      if (cast<VectorType>(Ty)->getElementType()->isFloatTy()) {
+        for (unsigned i = 0; i < R.AggregateVal.size(); ++i)
+          R.AggregateVal[i].FloatVal = -Src.AggregateVal[i].FloatVal;
+      } else if (cast<VectorType>(Ty)->getElementType()->isDoubleTy()) {
+        for (unsigned i = 0; i < R.AggregateVal.size(); ++i)
+          R.AggregateVal[i].DoubleVal = -Src.AggregateVal[i].DoubleVal;
+      } else {
+        llvm_unreachable("Unhandled type for FNeg instruction");
+      }
+      break;
+    }
+  } else {
+    switch (I.getOpcode()) {
+    default:
+      llvm_unreachable("Don't know how to handle this unary operator");
+      break;
+    case Instruction::FNeg: executeFNegInst(R, Src, Ty); break;
+    }
+  }
+  SetValue(&I, R, SF);
+}
+
+//===----------------------------------------------------------------------===//
 //                    Binary Instruction Implementations
 //===----------------------------------------------------------------------===//
 
diff --git a/llvm/lib/ExecutionEngine/Interpreter/Interpreter.h b/llvm/lib/ExecutionEngine/Interpreter/Interpreter.h
index 898f1d34ec1..e72d778317d 100644
--- a/llvm/lib/ExecutionEngine/Interpreter/Interpreter.h
+++ b/llvm/lib/ExecutionEngine/Interpreter/Interpreter.h
@@ -124,6 +124,7 @@ public:
   void visitSwitchInst(SwitchInst &I);
   void visitIndirectBrInst(IndirectBrInst &I);
 
+  void visitUnaryOperator(UnaryOperator &I);
   void visitBinaryOperator(BinaryOperator &I);
   void visitICmpInst(ICmpInst &I);
   void visitFCmpInst(FCmpInst &I);