From: Manman Ren <manman.ren@gmail.com>
Date: Fri, 27 Sep 2013 22:59:21 +0000 (+0000)
Subject: TBAA: try to fix the dragonegg bots.
X-Git-Url: http://demsky.eecs.uci.edu/git/?a=commitdiff_plain;h=e5f32cf3207da58359a6e3aeeb5b01205645f710;p=oota-llvm.git

TBAA: try to fix the dragonegg bots.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@191585 91177308-0d34-0410-b5e6-96231b3b80d8
---

diff --git a/lib/Analysis/TypeBasedAliasAnalysis.cpp b/lib/Analysis/TypeBasedAliasAnalysis.cpp
index ef37bdccbfd..9026dc91143 100644
--- a/lib/Analysis/TypeBasedAliasAnalysis.cpp
+++ b/lib/Analysis/TypeBasedAliasAnalysis.cpp
@@ -326,7 +326,9 @@ TypeBasedAliasAnalysis::getAnalysisUsage(AnalysisUsage &AU) const {
 /// it as struct-path aware TBAA format, otherwise, we treat it as scalar TBAA
 /// format.
 static bool isStructPathTBAA(const MDNode *MD) {
-  return isa<MDNode>(MD->getOperand(0));
+  // Anonymous TBAA root starts with a MDNode and dragonegg uses it as
+  // a TBAA tag.
+  return isa<MDNode>(MD->getOperand(0)) && MD->getNumOperands() >= 3;
 }
 
 /// Aliases - Test whether the type represented by A may alias the