[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
earl · Aug 28, 2019 · 8882971 · 8882971
1 parent c30fd89
commit 8882971
Showing 1 changed file with 2 additions and 0 deletions.
diff --git 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(