From db6b6a7f0c951c6b11b68605ede0aacbbda4bb2a Mon Sep 17 00:00:00 2001 From: Justin Bogner Date: Fri, 28 Oct 2016 22:42:54 +0000 Subject: [PATCH] SDAG: Make sure we use an allocatable reg class when we create this vreg As per the discussion on r280783, if constrainRegClass fails we need to call getAllocatableClass like we did before that commit. llvm-svn: 285467 --- llvm/lib/CodeGen/SelectionDAG/InstrEmitter.cpp | 2 ++ 1 file changed, 2 insertions(+) diff --git a/llvm/lib/CodeGen/SelectionDAG/InstrEmitter.cpp b/llvm/lib/CodeGen/SelectionDAG/InstrEmitter.cpp index d760a70..3b91e58 100644 --- a/llvm/lib/CodeGen/SelectionDAG/InstrEmitter.cpp +++ b/llvm/lib/CodeGen/SelectionDAG/InstrEmitter.cpp @@ -338,6 +338,8 @@ InstrEmitter::AddRegisterOperand(MachineInstrBuilder &MIB, const TargetRegisterClass *ConstrainedRC = MRI->constrainRegClass(VReg, OpRC, MinRCSize); if (!ConstrainedRC) { + OpRC = TRI->getAllocatableClass(OpRC); + assert(OpRC && "Constraints cannot be fulfilled for allocation"); unsigned NewVReg = MRI->createVirtualRegister(OpRC); BuildMI(*MBB, InsertPos, Op.getNode()->getDebugLoc(), TII->get(TargetOpcode::COPY), NewVReg).addReg(VReg); -- 2.7.4