From 61d531066d540a1a05fa44048ebef4bb1614acea Mon Sep 17 00:00:00 2001 From: Evan Cheng Date: Sat, 15 May 2010 01:35:44 +0000 Subject: [PATCH] A partial re-def instruction may be a copy. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103850 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/CodeGen/LiveIntervalAnalysis.cpp | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) diff --git a/lib/CodeGen/LiveIntervalAnalysis.cpp b/lib/CodeGen/LiveIntervalAnalysis.cpp index 78d46398a19..aa0597f6876 100644 --- a/lib/CodeGen/LiveIntervalAnalysis.cpp +++ b/lib/CodeGen/LiveIntervalAnalysis.cpp @@ -454,7 +454,14 @@ void LiveIntervals::handleVirtualRegisterDef(MachineBasicBlock *mbb, // Value#0 is now defined by the 2-addr instruction. OldValNo->def = RedefIndex; - OldValNo->setCopy(0); + if (!PartReDef) + OldValNo->setCopy(0); + else { + // A re-def may be a copy. e.g. %reg1030:6 = VMOVD %reg1026, ... + unsigned SrcReg, DstReg, SrcSubReg, DstSubReg; + if (tii_->isMoveInstr(*mi, SrcReg, DstReg, SrcSubReg, DstSubReg)) + OldValNo->setCopy(&*mi); + } // Add the new live interval which replaces the range for the input copy. LiveRange LR(DefIndex, RedefIndex, ValNo);