From 8ee317816607b6abef892fbc6a04ccf886518b99 Mon Sep 17 00:00:00 2001
From: "james.brodman" <james.brodman@intel.com>
Date: Mon, 28 Oct 2013 16:51:02 -0400
Subject: [PATCH] Add Performance Warning

---
 opt.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/opt.cpp b/opt.cpp
index 77fb9f21..bb788a8e 100644
--- a/opt.cpp
+++ b/opt.cpp
@@ -4998,6 +4998,8 @@ ReplaceStdlibShiftPass::runOnBasicBlock(llvm::BasicBlock &bb) {
                                                                    shuffleIdxs, "vecShift", ci);
                 ci->replaceAllUsesWith(shuffle);
                 modifiedAny = true;
+              } else {
+                PerformanceWarning(SourcePos(), "Stdlib shift() called without constant shift amount."); 
               }
             }
           }