From fb69f6037d1b79f83c895ed62dc3247e02bd2b5b Mon Sep 17 00:00:00 2001 From: Cameron Zwarich Date: Sun, 19 Dec 2010 22:12:45 +0000 Subject: [PATCH] Fix PR8815 by checking for an explicit clobber def tied to a use operand in ConnectedVNInfoEqClasses::Classify(). git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@122202 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/CodeGen/LiveInterval.cpp | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/lib/CodeGen/LiveInterval.cpp b/lib/CodeGen/LiveInterval.cpp index 3c18017f3fc..16551ab5d08 100644 --- a/lib/CodeGen/LiveInterval.cpp +++ b/lib/CodeGen/LiveInterval.cpp @@ -769,6 +769,14 @@ unsigned ConnectedVNInfoEqClasses::Classify(const LiveInterval *LI) { // operand constraint? if (const VNInfo *UVNI = LI->getVNInfoAt(VNI->def.getUseIndex())) Connect(VNI->id, UVNI->id); + + // Check for a tied operand constraint involving an early clobber def, + // where one VN ends right before the use index and the next VN is defined + // at the same use index. + if (VNI->def.isUse()) { + if (const VNInfo *PVNI = LI->getVNInfoAt(VNI->def.getLoadIndex())) + Connect(PVNI->id, VNI->id); + } } }