commit 3de8ad8bf9081fcb7ec0600fd2a8d1ce809f556d
author Andrew Trick <atrick@apple.com> Tue May 22 17:39:59 2012 +0000
committer Andrew Trick <atrick@apple.com> Tue May 22 17:39:59 2012 +0000
tree a49e2f9d56a995a8f8b37c6a4fdcfdf39d3369b3
parent 5c525b59d5e0036a778d278eeff4832edfd41357

LSR fix: add a missing phi check during IV hoisting.

Fixes PR12898: SCEVExpander crash.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@157263 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Analysis/ScalarEvolutionExpander.cpp

diff --git a/lib/Analysis/ScalarEvolutionExpander.cpp b/lib/Analysis/ScalarEvolutionExpander.cpp
index 69507be..e7fe672a 100644
--- a/lib/Analysis/ScalarEvolutionExpander.cpp
+++ b/lib/Analysis/ScalarEvolutionExpander.cpp
@@ -955,7 +955,8 @@
 
   // InsertPos must itself dominate IncV so that IncV's new position satisfies
   // its existing users.
-  if (!SE.DT->dominates(InsertPos->getParent(), IncV->getParent()))
+  if (isa<PHINode>(InsertPos)
+      || !SE.DT->dominates(InsertPos->getParent(), IncV->getParent()))
     return false;
 
   // Check that the chain of IV operands leading back to Phi can be hoisted.