implement codegen support for preinc as an lvalue, PR5514.

llvm-svn: 93076

2 files changed, 14 insertions, 2 deletions

diff --git a/clang/lib/CodeGen/CGExpr.cpp b/clang/lib/CodeGen/CGExpr.cpp
index 2c2b76f2e43..5809d1e70d8 100644
--- a/clang/lib/CodeGen/CGExpr.cpp
+++ b/clang/lib/CodeGen/CGExpr.cpp
@@ -1120,8 +1120,16 @@ LValue CodeGenFunction::EmitUnaryOpLValue(const UnaryOperator *E) {
                             MakeQualifiers(ExprTy));
   }
   case UnaryOperator::PreInc:
-  case UnaryOperator::PreDec:
-    return EmitUnsupportedLValue(E, "pre-inc/dec expression");
+  case UnaryOperator::PreDec: {
+    LValue LV = EmitLValue(E->getSubExpr());
+    bool isInc = E->getOpcode() == UnaryOperator::PreInc;
+    
+    if (E->getType()->isAnyComplexType())
+      EmitComplexPrePostIncDec(E, LV, isInc, true/*isPre*/);
+    else
+      EmitScalarPrePostIncDec(E, LV, isInc, true/*isPre*/);
+    return LV;
+  }
   }
 }
 
diff --git a/clang/test/CodeGenCXX/expr.cpp b/clang/test/CodeGenCXX/expr.cpp
index 6d641dcb622..d92cfb46a45 100644
--- a/clang/test/CodeGenCXX/expr.cpp
+++ b/clang/test/CodeGenCXX/expr.cpp
@@ -10,3 +10,7 @@ void test1() {
   char *xpto;
   while ( true && xpto[0] );
 }
+
+// PR5514
+int a;
+void test2() { ++a+=10; }