From e8d697d15ef097871a12b0e37bca87b81674bede Mon Sep 17 00:00:00 2001
From: Tim Besard <tim.besard@gmail.com>
Date: Thu, 11 Apr 2019 17:55:06 +0200
Subject: [PATCH] Don't modify existing MDNodes in SIMDloop pass.

(cherry picked from commit 0afa9a3acc0c57d71d719d204d19478fc885d5ea)
---
 src/llvm-simdloop.cpp | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/src/llvm-simdloop.cpp b/src/llvm-simdloop.cpp
index 683d41d57cc68..d64a6a8ddf921 100644
--- a/src/llvm-simdloop.cpp
+++ b/src/llvm-simdloop.cpp
@@ -207,8 +207,9 @@ bool LowerSIMDLoop::markSIMDLoop(Module &M, Function *marker, bool ivdep)
         MDNode *n = L->getLoopID();
         if (!n) {
             // Loop does not have a LoopID yet, so give it one.
-            n = MDNode::get(Lh->getContext(), ArrayRef<Metadata *>(NULL));
-            n->replaceOperandWith(0, n);
+            auto temp_n = MDNode::getTemporary(Lh->getContext(), ArrayRef<Metadata *>(NULL));
+            temp_n->replaceOperandWith(0, temp_n.get());
+            n = MDNode::replaceWithPermanent(std::move(temp_n));
             L->setLoopID(n);
         }