From 46c4e0a4bf1fe3a25daefa40b4104f48a6269e0c Mon Sep 17 00:00:00 2001
From: Artur Pilipenko <apilipenko@azulsystems.com>
Date: Fri, 19 May 2017 13:59:34 +0000
Subject: [PATCH] [LoopPredication] NFC. Add an early exit if there is no
 guards in the loop

llvm-svn: 303424
---
 llvm/lib/Transforms/Scalar/LoopPredication.cpp | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/llvm/lib/Transforms/Scalar/LoopPredication.cpp b/llvm/lib/Transforms/Scalar/LoopPredication.cpp
index 0ce604429326..e71448c4308c 100644
--- a/llvm/lib/Transforms/Scalar/LoopPredication.cpp
+++ b/llvm/lib/Transforms/Scalar/LoopPredication.cpp
@@ -272,6 +272,9 @@ bool LoopPredication::runOnLoop(Loop *Loop) {
         if (II->getIntrinsicID() == Intrinsic::experimental_guard)
           Guards.push_back(II);
 
+  if (Guards.empty())
+    return false;
+
   SCEVExpander Expander(*SE, *DL, "loop-predication");
 
   bool Changed = false;