From: Benjamin Kramer <benny.kra@googlemail.com>
Date: Thu, 28 Sep 2017 14:47:39 +0000 (+0000)
Subject: [LoopUnroll] Fix use after poison.
X-Git-Url: https://granicus.if.org/sourcecode?a=commitdiff_plain;h=2b11cf60dbe4b328252488bd9610fd80145f6a28;p=llvm

[LoopUnroll] Fix use after poison.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@314418 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Transforms/Scalar/LoopUnrollPass.cpp b/lib/Transforms/Scalar/LoopUnrollPass.cpp
index a7822c9c791..add18f3a0bf 100644
--- a/lib/Transforms/Scalar/LoopUnrollPass.cpp
+++ b/lib/Transforms/Scalar/LoopUnrollPass.cpp
@@ -1304,6 +1304,9 @@ PreservedAnalyses LoopUnrollPass::run(Function &F,
     // for unrolling is only needed to get optimization remarks emitted in
     // a forward order.
     Loop &L = *Worklist.pop_back_val();
+#ifndef NDEBUG
+    Loop *ParentL = L.getParentLoop();
+#endif
 
     // The API here is quite complex to call, but there are only two interesting
     // states we support: partial and full (or "simple") unrolling. However, to
@@ -1326,7 +1329,6 @@ PreservedAnalyses LoopUnrollPass::run(Function &F,
 
     // The parent must not be damaged by unrolling!
 #ifndef NDEBUG
-    Loop *ParentL = L.getParentLoop();
     if (Result != LoopUnrollResult::Unmodified && ParentL)
       ParentL->verifyLoop();
 #endif