[PATCH] Fix checked arithmetic for i8 on X86

[Keno Fischer]

This is http://llvm.org/bugs/show_bug.cgi?id=19858

http://reviews.llvm.org/D3920

Files:
  lib/Target/X86/X86ISelLowering.cpp

Index: lib/Target/X86/X86ISelLowering.cpp
===================================================================
--- lib/Target/X86/X86ISelLowering.cpp
+++ lib/Target/X86/X86ISelLowering.cpp
@@ -11469,8 +11469,11 @@
   }
 
   if (addTest) {
-    CC = DAG.getConstant(X86::COND_NE, MVT::i8);
-    Cond = EmitTest(Cond, X86::COND_NE, dl, DAG);
+    X86::CondCode X86Cond = X86::COND_NE;
+    if (Inverted)
+      X86Cond = X86::GetOppositeBranchCondition((X86::CondCode)X86Cond);
+    CC = DAG.getConstant(X86Cond, MVT::i8);
+    Cond = EmitTest(Cond, X86Cond, dl, DAG);
   }
   Cond = ConvertCmpIfNecessary(Cond, DAG);
   return DAG.getNode(X86ISD::BRCOND, dl, Op.getValueType(),
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