From 183bb77aa8813765170c9870f35b11ee4bff4bfd Mon Sep 17 00:00:00 2001
From: David Bolvansky <david.bolvansky@gmail.com>
Date: Wed, 28 Aug 2019 15:04:48 +0000
Subject: [PATCH] [NFC] Added a comment to avoid possible confusion

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@370217 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Transforms/InstCombine/InstCombineCalls.cpp | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/lib/Transforms/InstCombine/InstCombineCalls.cpp b/lib/Transforms/InstCombine/InstCombineCalls.cpp
index c3be8c4e9a9..d304f98ceae 100644
--- a/lib/Transforms/InstCombine/InstCombineCalls.cpp
+++ b/lib/Transforms/InstCombine/InstCombineCalls.cpp
@@ -4183,8 +4183,10 @@ static void annotateAnyAllocSite(CallBase &Call, const TargetLibraryInfo *TLI) {
   ConstantInt *Op1C = (Call.getNumArgOperands() == 1)
                           ? nullptr
                           : dyn_cast<ConstantInt>(Call.getOperand(1));
+  // Bail out if the allocation size is zero.
   if ((Op0C && Op0C->isNullValue()) || (Op1C && Op1C->isNullValue()))
     return;
+
   if (isMallocLikeFn(&Call, TLI) && Op0C) {
     Call.addAttribute(AttributeList::ReturnIndex,
                       Attribute::getWithDereferenceableOrNullBytes(
-- 
2.40.0