From bb8976e36e73560f0556a53ebc3fa2ff4d2449f1 Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Sat, 9 Jan 2010 21:44:40 +0000
Subject: implement codegen support for preinc as an lvalue, PR5514.

llvm-svn: 93076
---
 clang/lib/CodeGen/CGExpr.cpp | 12 ++++++++++--
 1 file changed, 10 insertions(+), 2 deletions(-)

(limited to 'clang/lib/CodeGen/CGExpr.cpp')

diff --git a/clang/lib/CodeGen/CGExpr.cpp b/clang/lib/CodeGen/CGExpr.cpp
index 2c2b76f2e43c..5809d1e70d8b 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;
+  }
   }
 }
 
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