From c69a5810f4a39f4af204e4843b497033ec6f12bf Mon Sep 17 00:00:00 2001
From: Chris Lattner <sabre@nondot.org>
Date: Fri, 30 Nov 2007 17:44:57 +0000
Subject: [PATCH] Support fully general case expressions, patch by Sanghyeon
 Seo!

git-svn-id: https://llvm.org/svn/llvm-project/cfe/trunk@44453 91177308-0d34-0410-b5e6-96231b3b80d8
---
 CodeGen/CGStmt.cpp    | 4 +++-
 test/CodeGen/switch.c | 2 ++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/CodeGen/CGStmt.cpp b/CodeGen/CGStmt.cpp
index 6a2e3aa543..9665e7dc63 100644
--- a/CodeGen/CGStmt.cpp
+++ b/CodeGen/CGStmt.cpp
@@ -444,7 +444,9 @@ void CodeGenFunction::EmitCaseStmt(const CaseStmt &S) {
     
   StartBlock("sw.bb");
   llvm::BasicBlock *CaseDest = Builder.GetInsertBlock();
-  llvm::ConstantInt *LV = cast<llvm::ConstantInt>(EmitScalarExpr(S.getLHS()));
+  llvm::APSInt CaseVal(32);
+  S.getLHS()->isIntegerConstantExpr(CaseVal, getContext());
+  llvm::ConstantInt *LV = llvm::ConstantInt::get(CaseVal);
   SwitchInsn->addCase(LV, CaseDest);
   EmitStmt(S.getSubStmt());
 }
diff --git a/test/CodeGen/switch.c b/test/CodeGen/switch.c
index 68313c0741..a4d77b9c19 100644
--- a/test/CodeGen/switch.c
+++ b/test/CodeGen/switch.c
@@ -3,6 +3,8 @@
 int foo(int i) {
   int j = 0;
   switch (i) {
+  case -1:
+    j = 1; break;
   case 1 : 
     j = 2; break;
   case 2:
-- 
2.50.1