From: Artur Pilipenko <apilipenko@azulsystems.com>
Date: Fri, 19 May 2017 13:59:34 +0000 (+0000)
Subject: [LoopPredication] NFC. Add an early exit if there is no guards in the loop
X-Git-Tag: android-x86-7.1-r4~16053
X-Git-Url: http://git.osdn.net/view?a=commitdiff_plain;h=92e33060a269513d0503dd4c5dbae0a274f8180c;p=android-x86%2Fexternal-llvm.git

[LoopPredication] NFC. Add an early exit if there is no guards in the loop

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@303424 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Transforms/Scalar/LoopPredication.cpp b/lib/Transforms/Scalar/LoopPredication.cpp
index 0ce60442932..e71448c4308 100644
--- a/lib/Transforms/Scalar/LoopPredication.cpp
+++ b/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;