Handle packed structs in the CBackend.

llvm-svn: 39752

2 files changed, 13 insertions, 1 deletions

diff --git a/llvm/lib/Target/CBackend/CBackend.cpp b/llvm/lib/Target/CBackend/CBackend.cpp
index 91f427fa2cb..b0c76c8e8e7 100644
--- a/llvm/lib/Target/CBackend/CBackend.cpp
+++ b/llvm/lib/Target/CBackend/CBackend.cpp
@@ -466,7 +466,10 @@ std::ostream &CWriter::printType(std::ostream &Out, const Type *Ty,
       printType(Out, *I, false, "field" + utostr(Idx++));
       Out << ";\n";
     }
-    return Out << '}';
+    Out << '}';
+    if (STy->isPacked())
+      Out << " __attribute__ ((packed))";
+    return Out;
   }
 
   case Type::PointerTyID: {
diff --git a/llvm/test/CodeGen/CBackend/2007-07-11-PackedStruct.ll b/llvm/test/CodeGen/CBackend/2007-07-11-PackedStruct.ll
new file mode 100644
index 00000000000..60576161118
--- /dev/null
+++ b/llvm/test/CodeGen/CBackend/2007-07-11-PackedStruct.ll
@@ -0,0 +1,9 @@
+; RUN: llvm-as < %s | llc -march=c | grep {packed}
+
+	%struct.p = type <{ i16 }>
+
+define i32 @main() {
+entry:
+        %t = alloca %struct.p, align 2
+	ret i32 5
+}