From 31b9c44cc13bb686010cf6bfbeef8745c39939b9 Mon Sep 17 00:00:00 2001 From: Evan Cheng Date: Tue, 11 May 2010 00:20:03 +0000 Subject: It's not safe eliminate copies where src and dst have different sub-register indices. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@103450 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/CodeGen/RegAllocFast.cpp | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'lib/CodeGen/RegAllocFast.cpp') diff --git a/lib/CodeGen/RegAllocFast.cpp b/lib/CodeGen/RegAllocFast.cpp index 7eafbc8475..ab5e1032e1 100644 --- a/lib/CodeGen/RegAllocFast.cpp +++ b/lib/CodeGen/RegAllocFast.cpp @@ -583,7 +583,8 @@ void RAFast::AllocateBasicBlock(MachineBasicBlock &MBB) { unsigned SrcCopyPhysReg = 0U; bool isCopy = TII->isMoveInstr(*MI, SrcCopyReg, DstCopyReg, SrcCopySubReg, DstCopySubReg); - if (isCopy && TargetRegisterInfo::isVirtualRegister(SrcCopyReg)) + if (isCopy && SrcCopySubReg == 0 && DstCopySubReg == 0 && + TargetRegisterInfo::isVirtualRegister(SrcCopyReg)) SrcCopyPhysReg = getVirt2PhysRegMapSlot(SrcCopyReg); // Loop over the implicit uses, making sure they don't get reallocated. -- cgit v1.2.3-70-g09d2