1 files changed, 9 insertions, 2 deletions
diff --git a/lib/CodeGen/TargetInfo.cpp b/lib/CodeGen/TargetInfo.cpp
index d74b3f3..2ffc840 100644
--- a/lib/CodeGen/TargetInfo.cpp
+++ b/lib/CodeGen/TargetInfo.cpp
@@ -2105,8 +2105,15 @@ ABIArgInfo WinX86_64ABIInfo::classify(QualType Ty) const {
         RT->getDecl()->hasFlexibleArrayMember())
       return ABIArgInfo::getIndirect(0, /*ByVal=*/false);
 
-    // FIXME: mingw64-gcc emits 128-bit struct as i128
-    if (Size <= 128 &&
+    // FIXME: mingw-w64-gcc emits 128-bit struct as i128
+    if (Size == 128 &&
+        getContext().Target.getTriple().getOS() == llvm::Triple::MinGW32)
+      return ABIArgInfo::getDirect(llvm::IntegerType::get(getVMContext(),
+                                                          Size));
+
+    // MS x64 ABI requirement: "Any argument that doesn't fit in 8 bytes, or is
+    // not 1, 2, 4, or 8 bytes, must be passed by reference."
+    if (Size <= 64 &&
         (Size & (Size - 1)) == 0)
       return ABIArgInfo::getDirect(llvm::IntegerType::get(getVMContext(),
                                                           Size));