Revert r345676 due to test failure.

This was causing CodeGen/mingw-long-double.c to start failing.

llvm-svn: 345691

Author: Weverything

clang/lib/CodeGen/TargetInfo.cpp

@@ -3943,40 +3943,18 @@ ABIArgInfo WinX86_64ABIInfo::classify(QualType Ty, unsigned &FreeSSERegs,
     // Otherwise, coerce it to a small integer.
     return ABIArgInfo::getDirect(llvm::IntegerType::get(getVMContext(), Width));
   }
+  // Bool type is always extended to the ABI, other builtin types are not
+  // extended.
+  const BuiltinType *BT = Ty->getAs<BuiltinType>();
+  if (BT && BT->getKind() == BuiltinType::Bool)
+    return ABIArgInfo::getExtend(Ty);
 
-  if (const BuiltinType *BT = Ty->getAs<BuiltinType>()) {
-    switch (BT->getKind()) {
-    case BuiltinType::Bool:
-      // Bool type is always extended to the ABI, other builtin types are not
-      // extended.
-      return ABIArgInfo::getExtend(Ty);
-
-    case BuiltinType::LongDouble:
-      // Mingw64 GCC uses the old 80 bit extended precision floating point
-      // unit. It passes them indirectly through memory.
-      if (IsMingw64) {
-        const llvm::fltSemantics *LDF = &getTarget().getLongDoubleFormat();
-        if (LDF == &llvm::APFloat::x87DoubleExtended())
-          return ABIArgInfo::getIndirect(Align, /*ByVal=*/false);
-        break;
-      }
-
-    case BuiltinType::Int128:
-    case BuiltinType::UInt128:
-      // If it's a parameter type, the normal ABI rule is that arguments larger
-      // than 8 bytes are passed indirectly. GCC follows it. We follow it too,
-      // even though it isn't particularly efficient.
-      if (!IsReturnType)
-        return ABIArgInfo::getIndirect(Align, /*ByVal=*/false);
-
-      // Mingw64 GCC returns i128 in XMM0. Coerce to v2i64 to handle that.
-      // Clang matches them for compatibility.
-      return ABIArgInfo::getDirect(
-          llvm::VectorType::get(llvm::Type::getInt64Ty(getVMContext()), 2));
-
-    default:
-      break;
-    }
+  // Mingw64 GCC uses the old 80 bit extended precision floating point unit. It
+  // passes them indirectly through memory.
+  if (IsMingw64 && BT && BT->getKind() == BuiltinType::LongDouble) {
+    const llvm::fltSemantics *LDF = &getTarget().getLongDoubleFormat();
+    if (LDF == &llvm::APFloat::x87DoubleExtended())
+      return ABIArgInfo::getIndirect(Align, /*ByVal=*/false);
   }
 
   return ABIArgInfo::getDirect();