From a3b10b83597dabd926a5153ac2eb867e7920f471 Mon Sep 17 00:00:00 2001 From: Andrew Trick Date: Tue, 20 Mar 2012 21:24:44 +0000 Subject: LSR: teach isSimplifiedLoopNest to handle PHI IVUsers. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153132 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/Analysis/IVUsers.cpp | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) (limited to 'lib/Analysis/IVUsers.cpp') diff --git a/lib/Analysis/IVUsers.cpp b/lib/Analysis/IVUsers.cpp index 308729fcf1..463584db89 100644 --- a/lib/Analysis/IVUsers.cpp +++ b/lib/Analysis/IVUsers.cpp @@ -148,7 +148,14 @@ bool IVUsers::AddUsersIfInteresting(Instruction *I, // Only consider IVUsers that are dominated by simplified loop // headers. Otherwise, SCEVExpander will crash. - if (!isSimplifiedLoopNest(User->getParent(), DT, LI, SimpleLoopNests)) + BasicBlock *UseBB = User->getParent(); + // A phi's use is live out of its predecessor block. + if (PHINode *PHI = dyn_cast(User)) { + unsigned OperandNo = UI.getOperandNo(); + unsigned ValNo = PHINode::getIncomingValueNumForOperand(OperandNo); + UseBB = PHI->getIncomingBlock(ValNo); + } + if (!isSimplifiedLoopNest(UseBB, DT, LI, SimpleLoopNests)) return false; // Descend recursively, but not into PHI nodes outside the current loop. -- cgit v1.2.3