Implement basic _Complex integer constant folding.

 - Merged into single ComplexEvaluator, these share too much logic to
   be worth splitting for float/int (IMHO). Will split on request.

llvm-svn: 63248

1 files changed, 11 insertions, 1 deletions

diff --git a/clang/lib/CodeGen/CGExprConstant.cpp b/clang/lib/CodeGen/CGExprConstant.cpp
index 3b6ebb4d56f..87868ed347a 100644
--- a/clang/lib/CodeGen/CGExprConstant.cpp
+++ b/clang/lib/CodeGen/CGExprConstant.cpp
@@ -597,7 +597,9 @@ llvm::Constant *CodeGenModule::EmitConstantExpr(const Expr *E,
     assert(!Result.HasSideEffects && 
            "Constant expr should not have any side effects!");
     switch (Result.Val.getKind()) {
-    default: assert(0 && "unhandled value kind!");
+    case APValue::Uninitialized:
+      assert(0 && "Constant expressions should be uninitialized.");
+      return llvm::UndefValue::get(getTypes().ConvertType(type));
     case APValue::LValue: {
       llvm::Constant *Offset = 
         llvm::ConstantInt::get(llvm::Type::Int64Ty, 
@@ -631,6 +633,14 @@ llvm::Constant *CodeGenModule::EmitConstantExpr(const Expr *E,
       }
       return C;
     }
+    case APValue::ComplexInt: {
+      llvm::Constant *Complex[2];
+      
+      Complex[0] = llvm::ConstantInt::get(Result.Val.getComplexIntReal());
+      Complex[1] = llvm::ConstantInt::get(Result.Val.getComplexIntImag());
+      
+      return llvm::ConstantStruct::get(Complex, 2);
+    }
     case APValue::Float:
       return llvm::ConstantFP::get(Result.Val.getFloat());
     case APValue::ComplexFloat: {