From 63e6a488cb6c29983415221719d05fbf99e00193 Mon Sep 17 00:00:00 2001 From: Jakob Stoklund Olesen Date: Fri, 21 May 2010 16:32:16 +0000 Subject: If the first definition of a virtual register is a partial redef, add an operand for the full register. This ensures that the full physical register is marked live after register allocation. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@104320 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/CodeGen/LiveIntervalAnalysis.cpp | 9 ++++++++- 1 file changed, 8 insertions(+), 1 deletion(-) (limited to 'lib/CodeGen/LiveIntervalAnalysis.cpp') diff --git a/lib/CodeGen/LiveIntervalAnalysis.cpp b/lib/CodeGen/LiveIntervalAnalysis.cpp index fd933cedd0..c07802ee26 100644 --- a/lib/CodeGen/LiveIntervalAnalysis.cpp +++ b/lib/CodeGen/LiveIntervalAnalysis.cpp @@ -320,6 +320,12 @@ void LiveIntervals::handleVirtualRegisterDef(MachineBasicBlock *mbb, // of inputs. if (MO.isEarlyClobber()) defIndex = MIIdx.getUseIndex(); + + // Make sure the first definition is not a partial redefinition. Add an + // of the full register. + if (MO.getSubReg()) + mi->addRegisterDefined(interval.reg); + MachineInstr *CopyMI = NULL; unsigned SrcReg, DstReg, SrcSubReg, DstSubReg; if (mi->isExtractSubreg() || mi->isInsertSubreg() || mi->isSubregToReg() || @@ -1371,7 +1377,8 @@ rewriteInstructionsForSpills(const LiveInterval &li, bool TrySplit, MI->eraseFromParent(); continue; } - assert(!O.isImplicit() && "Spilling register that's used as implicit use?"); + assert(!(O.isImplicit() && O.isUse()) && + "Spilling register that's used as implicit use?"); SlotIndex index = getInstructionIndex(MI); if (index < start || index >= end) continue; -- cgit v1.2.3-70-g09d2