From d62bbbebbf709b1eaebaace62c58e759cbd32005 Mon Sep 17 00:00:00 2001
From: Johannes Doerfert <johannes@jdoerfert.de>
Date: Tue, 20 Jul 2021 09:16:56 -0500
Subject: [PATCH] [Attributor] Initialize effectively unused value to appease
 UBSAN

---
 llvm/lib/Transforms/IPO/AttributorAttributes.cpp | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/llvm/lib/Transforms/IPO/AttributorAttributes.cpp b/llvm/lib/Transforms/IPO/AttributorAttributes.cpp
index 91f57a8..98bce21 100644
--- a/llvm/lib/Transforms/IPO/AttributorAttributes.cpp
+++ b/llvm/lib/Transforms/IPO/AttributorAttributes.cpp
@@ -5144,7 +5144,7 @@ struct AAValueSimplifyImpl : AAValueSimplify {
       if (isa<ConstantPointerNull>(Obj)) {
         // A null pointer access can be undefined but any offset from null may
         // be OK. We do not try to optimize the latter.
-        bool UsedAssumedInformation;
+        bool UsedAssumedInformation = false;
         if (!NullPointerIsDefined(L.getFunction(),
                                   Ptr.getType()->getPointerAddressSpace()) &&
             A.getAssumedSimplified(Ptr, AA, UsedAssumedInformation) == Obj)
-- 
2.7.4