From 4b0e2a30e0fe55d55d3c0255fa79c14be3138722 Mon Sep 17 00:00:00 2001
From: Eli Friedman <eli.friedman@gmail.com>
Date: Tue, 20 May 2008 07:56:31 +0000
Subject: [PATCH] Implement codegen for comma operator for structs.

llvm-svn: 51304
---
 clang/lib/CodeGen/CGExprAgg.cpp   | 7 +++++++
 clang/test/CodeGen/struct-comma.c | 4 ++++
 2 files changed, 11 insertions(+)
 create mode 100644 clang/test/CodeGen/struct-comma.c

diff --git a/clang/lib/CodeGen/CGExprAgg.cpp b/clang/lib/CodeGen/CGExprAgg.cpp
index c7c250ee7beb..2ac473439e67 100644
--- a/clang/lib/CodeGen/CGExprAgg.cpp
+++ b/clang/lib/CodeGen/CGExprAgg.cpp
@@ -82,6 +82,7 @@ public:
   void VisitBinaryOperator(const BinaryOperator *BO);
   void VisitBinAssign(const BinaryOperator *E);
   void VisitOverloadExpr(const OverloadExpr *E);
+  void VisitBinComma(const BinaryOperator *E);
 
   
   void VisitConditionalOperator(const ConditionalOperator *CO);
@@ -213,6 +214,12 @@ void AggExprEmitter::VisitOverloadExpr(const OverloadExpr *E)
   EmitAggregateCopy(DestPtr, RV.getAggregateAddr(), E->getType());
 }
 
+void AggExprEmitter::VisitBinComma(const BinaryOperator *E)
+{
+  CGF.EmitAnyExpr(E->getLHS());
+  CGF.EmitAggExpr(E->getRHS(), DestPtr, false);
+}
+
 void AggExprEmitter::VisitStmtExpr(const StmtExpr *E) {
   CGF.EmitCompoundStmt(*E->getSubStmt(), true, DestPtr, VolatileDest);
 }
diff --git a/clang/test/CodeGen/struct-comma.c b/clang/test/CodeGen/struct-comma.c
new file mode 100644
index 000000000000..e8070dd17821
--- /dev/null
+++ b/clang/test/CodeGen/struct-comma.c
@@ -0,0 +1,4 @@
+// RUN: clang %s -emit-llvm
+
+struct S {int a, b;} x;
+void a(struct S* b) {*b = (r(), x);}