Handle readwrite constraints correctly

llvm-svn: 62043

2 files changed, 7 insertions, 1 deletions

diff --git a/clang/lib/CodeGen/CGStmt.cpp b/clang/lib/CodeGen/CGStmt.cpp
index 8d80a498b45..bee40e5c28b 100644
--- a/clang/lib/CodeGen/CGStmt.cpp
+++ b/clang/lib/CodeGen/CGStmt.cpp
@@ -944,9 +944,10 @@ void CodeGenFunction::EmitAsmStmt(const AsmStmt &S) {
       const Expr *InputExpr = S.getOutputExpr(i);
       llvm::Value *Arg = EmitAsmInput(S, Info, InputExpr, InOutConstraints);
       
+      InOutConstraints += llvm::utostr(Args.size());
+
       InOutArgTypes.push_back(Arg->getType());
       InOutArgs.push_back(Arg);
-      InOutConstraints += OutputConstraint;
     }
   }
   
diff --git a/clang/test/CodeGen/asm.c b/clang/test/CodeGen/asm.c
new file mode 100644
index 00000000000..d6fbf774081
--- /dev/null
+++ b/clang/test/CodeGen/asm.c
@@ -0,0 +1,5 @@
+// RUN: clang %s -arch=i386 -verify -fsyntax-only
+void f(int len)
+{
+  __asm__ volatile("" :"=&r"(len), "+&r"(len));
+}