lib/Target/VE/VEISelDAGToDAG.cpp - llvm-project/llvm - Git at Google

 //===-- VEISelDAGToDAG.cpp - A dag to dag inst selector for VE ------------===//
 //
 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
 // See https://llvm.org/LICENSE.txt for license information.
 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
 //
 //===----------------------------------------------------------------------===//
 //
 // This file defines an instruction selector for the VE target.
 //
 //===----------------------------------------------------------------------===//

 #include "VE.h"
 #include "VETargetMachine.h"
 #include "llvm/CodeGen/MachineRegisterInfo.h"
 #include "llvm/CodeGen/SelectionDAGISel.h"
 #include "llvm/IR/Intrinsics.h"
 #include "llvm/Support/Debug.h"
 #include "llvm/Support/ErrorHandling.h"
 #include "llvm/Support/raw_ostream.h"
 using namespace llvm;

 #define DEBUG_TYPE "ve-isel"
 #define PASS_NAME "VE DAG->DAG Pattern Instruction Selection"

 //===--------------------------------------------------------------------===//
 /// VEDAGToDAGISel - VE specific code to select VE machine
 /// instructions for SelectionDAG operations.
 ///
 namespace {
 class VEDAGToDAGISel : public SelectionDAGISel {
   /// Subtarget - Keep a pointer to the VE Subtarget around so that we can
   /// make the right decision when generating code for different targets.
   const VESubtarget *Subtarget;

 public:
   static char ID;

   VEDAGToDAGISel() = delete;

   explicit VEDAGToDAGISel(VETargetMachine &tm) : SelectionDAGISel(ID, tm) {}

   bool runOnMachineFunction(MachineFunction &MF) override {
     Subtarget = &MF.getSubtarget<VESubtarget>();
     return SelectionDAGISel::runOnMachineFunction(MF);
   }

   void Select(SDNode *N) override;

   // Complex Pattern Selectors.
   bool selectADDRrri(SDValue N, SDValue &Base, SDValue &Index, SDValue &Offset);
   bool selectADDRrii(SDValue N, SDValue &Base, SDValue &Index, SDValue &Offset);
   bool selectADDRzri(SDValue N, SDValue &Base, SDValue &Index, SDValue &Offset);
   bool selectADDRzii(SDValue N, SDValue &Base, SDValue &Index, SDValue &Offset);
   bool selectADDRri(SDValue N, SDValue &Base, SDValue &Offset);
   bool selectADDRzi(SDValue N, SDValue &Base, SDValue &Offset);

   /// SelectInlineAsmMemoryOperand - Implement addressing mode selection for
   /// inline asm expressions.
   bool SelectInlineAsmMemoryOperand(const SDValue &Op,
                                     InlineAsm::ConstraintCode ConstraintID,
                                     std::vector<SDValue> &OutOps) override;

   // Include the pieces autogenerated from the target description.
 #include "VEGenDAGISel.inc"

 private:
   SDNode *getGlobalBaseReg();

   bool matchADDRrr(SDValue N, SDValue &Base, SDValue &Index);
   bool matchADDRri(SDValue N, SDValue &Base, SDValue &Offset);
 };
 } // end anonymous namespace

 char VEDAGToDAGISel::ID = 0;

 INITIALIZE_PASS(VEDAGToDAGISel, DEBUG_TYPE, PASS_NAME, false, false)

 bool VEDAGToDAGISel::selectADDRrri(SDValue Addr, SDValue &Base, SDValue &Index,
                                    SDValue &Offset) {
   if (Addr.getOpcode() == ISD::FrameIndex)
     return false;
   if (Addr.getOpcode() == ISD::TargetExternalSymbol ||
       Addr.getOpcode() == ISD::TargetGlobalAddress ||
       Addr.getOpcode() == ISD::TargetGlobalTLSAddress)
     return false; // direct calls.

   SDValue LHS, RHS;
   if (matchADDRri(Addr, LHS, RHS)) {
     if (matchADDRrr(LHS, Base, Index)) {
       Offset = RHS;
       return true;
     }
     // Return false to try selectADDRrii.
     return false;
   }
   if (matchADDRrr(Addr, LHS, RHS)) {
     // If the input is a pair of a frame-index and a register, move a
     // frame-index to LHS.  This generates MI with following operands.
     //    %dest, #FI, %reg, offset
     // In the eliminateFrameIndex, above MI is converted to the following.
     //    %dest, %fp, %reg, fi_offset + offset
     if (isa<FrameIndexSDNode>(RHS))
       std::swap(LHS, RHS);

     if (matchADDRri(RHS, Index, Offset)) {
       Base = LHS;
       return true;
     }
     if (matchADDRri(LHS, Base, Offset)) {
       Index = RHS;
       return true;
     }
     Base = LHS;
     Index = RHS;
     Offset = CurDAG->getTargetConstant(0, SDLoc(Addr), MVT::i32);
     return true;
   }
   return false; // Let the reg+imm(=0) pattern catch this!
 }

 bool VEDAGToDAGISel::selectADDRrii(SDValue Addr, SDValue &Base, SDValue &Index,
                                    SDValue &Offset) {
   if (matchADDRri(Addr, Base, Offset)) {
     Index = CurDAG->getTargetConstant(0, SDLoc(Addr), MVT::i32);
     return true;
   }

   Base = Addr;
   Index = CurDAG->getTargetConstant(0, SDLoc(Addr), MVT::i32);
   Offset = CurDAG->getTargetConstant(0, SDLoc(Addr), MVT::i32);
   return true;
 }

 bool VEDAGToDAGISel::selectADDRzri(SDValue Addr, SDValue &Base, SDValue &Index,
                                    SDValue &Offset) {
   // Prefer ADDRrii.
   return false;
 }

 bool VEDAGToDAGISel::selectADDRzii(SDValue Addr, SDValue &Base, SDValue &Index,
                                    SDValue &Offset) {
   if (isa<FrameIndexSDNode>(Addr))
     return false;
   if (Addr.getOpcode() == ISD::TargetExternalSymbol ||
       Addr.getOpcode() == ISD::TargetGlobalAddress ||
       Addr.getOpcode() == ISD::TargetGlobalTLSAddress)
     return false; // direct calls.

   if (auto *CN = dyn_cast<ConstantSDNode>(Addr)) {
     if (isInt<32>(CN->getSExtValue())) {
       Base = CurDAG->getTargetConstant(0, SDLoc(Addr), MVT::i32);
       Index = CurDAG->getTargetConstant(0, SDLoc(Addr), MVT::i32);
       Offset =
           CurDAG->getTargetConstant(CN->getZExtValue(), SDLoc(Addr), MVT::i32);
       return true;
     }
   }
   return false;
 }

 bool VEDAGToDAGISel::selectADDRri(SDValue Addr, SDValue &Base,
                                   SDValue &Offset) {
   if (matchADDRri(Addr, Base, Offset))
     return true;

   Base = Addr;
   Offset = CurDAG->getTargetConstant(0, SDLoc(Addr), MVT::i32);
   return true;
 }

 bool VEDAGToDAGISel::selectADDRzi(SDValue Addr, SDValue &Base,
                                   SDValue &Offset) {
   if (isa<FrameIndexSDNode>(Addr))
     return false;
   if (Addr.getOpcode() == ISD::TargetExternalSymbol ||
       Addr.getOpcode() == ISD::TargetGlobalAddress ||
       Addr.getOpcode() == ISD::TargetGlobalTLSAddress)
     return false; // direct calls.

   if (auto *CN = dyn_cast<ConstantSDNode>(Addr)) {
     if (isInt<32>(CN->getSExtValue())) {
       Base = CurDAG->getTargetConstant(0, SDLoc(Addr), MVT::i32);
       Offset =
           CurDAG->getTargetConstant(CN->getZExtValue(), SDLoc(Addr), MVT::i32);
       return true;
     }
   }
   return false;
 }

 bool VEDAGToDAGISel::matchADDRrr(SDValue Addr, SDValue &Base, SDValue &Index) {
   if (isa<FrameIndexSDNode>(Addr))
     return false;
   if (Addr.getOpcode() == ISD::TargetExternalSymbol ||
       Addr.getOpcode() == ISD::TargetGlobalAddress ||
       Addr.getOpcode() == ISD::TargetGlobalTLSAddress)
     return false; // direct calls.

   if (Addr.getOpcode() == ISD::ADD) {
     ; // Nothing to do here.
   } else if (Addr.getOpcode() == ISD::OR) {
     // We want to look through a transform in InstCombine and DAGCombiner that
     // turns 'add' into 'or', so we can treat this 'or' exactly like an 'add'.
     if (!CurDAG->haveNoCommonBitsSet(Addr.getOperand(0), Addr.getOperand(1)))
       return false;
   } else {
     return false;
   }

   if (Addr.getOperand(0).getOpcode() == VEISD::Lo ||
       Addr.getOperand(1).getOpcode() == VEISD::Lo)
     return false; // Let the LEASL patterns catch this!

   Base = Addr.getOperand(0);
   Index = Addr.getOperand(1);
   return true;
 }

 bool VEDAGToDAGISel::matchADDRri(SDValue Addr, SDValue &Base, SDValue &Offset) {
   auto AddrTy = Addr->getValueType(0);
   if (FrameIndexSDNode *FIN = dyn_cast<FrameIndexSDNode>(Addr)) {
     Base = CurDAG->getTargetFrameIndex(FIN->getIndex(), AddrTy);
     Offset = CurDAG->getTargetConstant(0, SDLoc(Addr), MVT::i32);
     return true;
   }
   if (Addr.getOpcode() == ISD::TargetExternalSymbol ||
       Addr.getOpcode() == ISD::TargetGlobalAddress ||
       Addr.getOpcode() == ISD::TargetGlobalTLSAddress)
     return false; // direct calls.

   if (CurDAG->isBaseWithConstantOffset(Addr)) {
     ConstantSDNode *CN = cast<ConstantSDNode>(Addr.getOperand(1));
     if (isInt<32>(CN->getSExtValue())) {
       if (FrameIndexSDNode *FIN =
               dyn_cast<FrameIndexSDNode>(Addr.getOperand(0))) {
         // Constant offset from frame ref.
         Base = CurDAG->getTargetFrameIndex(FIN->getIndex(), AddrTy);
       } else {
         Base = Addr.getOperand(0);
       }
       Offset =
           CurDAG->getTargetConstant(CN->getZExtValue(), SDLoc(Addr), MVT::i32);
       return true;
     }
   }
   return false;
 }

 void VEDAGToDAGISel::Select(SDNode *N) {
   SDLoc dl(N);
   if (N->isMachineOpcode()) {
     N->setNodeId(-1);
     return; // Already selected.
   }

   switch (N->getOpcode()) {

   // Late eliminate the LEGALAVL wrapper
   case VEISD::LEGALAVL:
     ReplaceNode(N, N->getOperand(0).getNode());
     return;

   // Lower (broadcast 1) and (broadcast 0) to VM[P]0
   case VEISD::VEC_BROADCAST: {
     MVT SplatResTy = N->getSimpleValueType(0);
     if (SplatResTy.getVectorElementType() != MVT::i1)
       break;

     // Constant non-zero broadcast.
     auto BConst = dyn_cast<ConstantSDNode>(N->getOperand(0));
     if (!BConst)
       break;
     bool BCTrueMask = (BConst->getSExtValue() != 0);
     if (!BCTrueMask)
       break;

     // Packed or non-packed.
     SDValue New;
     if (SplatResTy.getVectorNumElements() == StandardVectorWidth) {
       New = CurDAG->getCopyFromReg(CurDAG->getEntryNode(), SDLoc(N), VE::VM0,
                                    MVT::v256i1);
     } else if (SplatResTy.getVectorNumElements() == PackedVectorWidth) {
       New = CurDAG->getCopyFromReg(CurDAG->getEntryNode(), SDLoc(N), VE::VMP0,
                                    MVT::v512i1);
     } else
       break;

     // Replace.
     ReplaceNode(N, New.getNode());
     return;
   }

   case VEISD::GLOBAL_BASE_REG:
     ReplaceNode(N, getGlobalBaseReg());
     return;
   }

   SelectCode(N);
 }

 /// SelectInlineAsmMemoryOperand - Implement addressing mode selection for
 /// inline asm expressions.
 bool VEDAGToDAGISel::SelectInlineAsmMemoryOperand(
     const SDValue &Op, InlineAsm::ConstraintCode ConstraintID,
     std::vector<SDValue> &OutOps) {
   SDValue Op0, Op1;
   switch (ConstraintID) {
   default:
     llvm_unreachable("Unexpected asm memory constraint");
   case InlineAsm::ConstraintCode::o:
   case InlineAsm::ConstraintCode::m: // memory
     // Try to match ADDRri since reg+imm style is safe for all VE instructions
     // with a memory operand.
     if (selectADDRri(Op, Op0, Op1)) {
       OutOps.push_back(Op0);
       OutOps.push_back(Op1);
       return false;
     }
     // Otherwise, require the address to be in a register and immediate 0.
     OutOps.push_back(Op);
     OutOps.push_back(CurDAG->getTargetConstant(0, SDLoc(Op), MVT::i32));
     return false;
   }
   return true;
 }

 SDNode *VEDAGToDAGISel::getGlobalBaseReg() {
   Register GlobalBaseReg = Subtarget->getInstrInfo()->getGlobalBaseReg(MF);
   return CurDAG
       ->getRegister(GlobalBaseReg, TLI->getPointerTy(CurDAG->getDataLayout()))
       .getNode();
 }

 /// createVEISelDag - This pass converts a legalized DAG into a
 /// VE-specific DAG, ready for instruction scheduling.
 ///
 FunctionPass *llvm::createVEISelDag(VETargetMachine &TM) {
   return new VEDAGToDAGISel(TM);
 }
	//===-- VEISelDAGToDAG.cpp - A dag to dag inst selector for VE ------------===//
	//
	// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
	// See https://llvm.org/LICENSE.txt for license information.
	// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
	//
	//===----------------------------------------------------------------------===//
	//
	// This file defines an instruction selector for the VE target.
	//
	//===----------------------------------------------------------------------===//

	#include "VE.h"
	#include "VETargetMachine.h"
	#include "llvm/CodeGen/MachineRegisterInfo.h"
	#include "llvm/CodeGen/SelectionDAGISel.h"
	#include "llvm/IR/Intrinsics.h"
	#include "llvm/Support/Debug.h"
	#include "llvm/Support/ErrorHandling.h"
	#include "llvm/Support/raw_ostream.h"
	using namespace llvm;

	#define DEBUG_TYPE "ve-isel"
	#define PASS_NAME "VE DAG->DAG Pattern Instruction Selection"

	//===--------------------------------------------------------------------===//
	/// VEDAGToDAGISel - VE specific code to select VE machine
	/// instructions for SelectionDAG operations.
	///
	namespace {
	class VEDAGToDAGISel : public SelectionDAGISel {
	/// Subtarget - Keep a pointer to the VE Subtarget around so that we can
	/// make the right decision when generating code for different targets.
	const VESubtarget *Subtarget;

	public:
	static char ID;

	VEDAGToDAGISel() = delete;

	explicit VEDAGToDAGISel(VETargetMachine &tm) : SelectionDAGISel(ID, tm) {}

	bool runOnMachineFunction(MachineFunction &MF) override {
	Subtarget = &MF.getSubtarget<VESubtarget>();
	return SelectionDAGISel::runOnMachineFunction(MF);
	}

	void Select(SDNode *N) override;

	// Complex Pattern Selectors.
	bool selectADDRrri(SDValue N, SDValue &Base, SDValue &Index, SDValue &Offset);
	bool selectADDRrii(SDValue N, SDValue &Base, SDValue &Index, SDValue &Offset);
	bool selectADDRzri(SDValue N, SDValue &Base, SDValue &Index, SDValue &Offset);
	bool selectADDRzii(SDValue N, SDValue &Base, SDValue &Index, SDValue &Offset);
	bool selectADDRri(SDValue N, SDValue &Base, SDValue &Offset);
	bool selectADDRzi(SDValue N, SDValue &Base, SDValue &Offset);

	/// SelectInlineAsmMemoryOperand - Implement addressing mode selection for
	/// inline asm expressions.
	bool SelectInlineAsmMemoryOperand(const SDValue &Op,
	InlineAsm::ConstraintCode ConstraintID,
	std::vector<SDValue> &OutOps) override;

	// Include the pieces autogenerated from the target description.
	#include "VEGenDAGISel.inc"

	private:
	SDNode *getGlobalBaseReg();

	bool matchADDRrr(SDValue N, SDValue &Base, SDValue &Index);
	bool matchADDRri(SDValue N, SDValue &Base, SDValue &Offset);
	};
	} // end anonymous namespace

	char VEDAGToDAGISel::ID = 0;

	INITIALIZE_PASS(VEDAGToDAGISel, DEBUG_TYPE, PASS_NAME, false, false)

	bool VEDAGToDAGISel::selectADDRrri(SDValue Addr, SDValue &Base, SDValue &Index,
	SDValue &Offset) {
	if (Addr.getOpcode() == ISD::FrameIndex)
	return false;
	if (Addr.getOpcode() == ISD::TargetExternalSymbol \|\|
	Addr.getOpcode() == ISD::TargetGlobalAddress \|\|
	Addr.getOpcode() == ISD::TargetGlobalTLSAddress)
	return false; // direct calls.

	SDValue LHS, RHS;
	if (matchADDRri(Addr, LHS, RHS)) {
	if (matchADDRrr(LHS, Base, Index)) {
	Offset = RHS;
	return true;
	}
	// Return false to try selectADDRrii.
	return false;
	}
	if (matchADDRrr(Addr, LHS, RHS)) {
	// If the input is a pair of a frame-index and a register, move a
	// frame-index to LHS. This generates MI with following operands.
	// %dest, #FI, %reg, offset
	// In the eliminateFrameIndex, above MI is converted to the following.
	// %dest, %fp, %reg, fi_offset + offset
	if (isa<FrameIndexSDNode>(RHS))
	std::swap(LHS, RHS);

	if (matchADDRri(RHS, Index, Offset)) {
	Base = LHS;
	return true;
	}
	if (matchADDRri(LHS, Base, Offset)) {
	Index = RHS;
	return true;
	}
	Base = LHS;
	Index = RHS;
	Offset = CurDAG->getTargetConstant(0, SDLoc(Addr), MVT::i32);
	return true;
	}
	return false; // Let the reg+imm(=0) pattern catch this!
	}

	bool VEDAGToDAGISel::selectADDRrii(SDValue Addr, SDValue &Base, SDValue &Index,
	SDValue &Offset) {
	if (matchADDRri(Addr, Base, Offset)) {
	Index = CurDAG->getTargetConstant(0, SDLoc(Addr), MVT::i32);
	return true;
	}

	Base = Addr;
	Index = CurDAG->getTargetConstant(0, SDLoc(Addr), MVT::i32);
	Offset = CurDAG->getTargetConstant(0, SDLoc(Addr), MVT::i32);
	return true;
	}

	bool VEDAGToDAGISel::selectADDRzri(SDValue Addr, SDValue &Base, SDValue &Index,
	SDValue &Offset) {
	// Prefer ADDRrii.
	return false;
	}

	bool VEDAGToDAGISel::selectADDRzii(SDValue Addr, SDValue &Base, SDValue &Index,
	SDValue &Offset) {
	if (isa<FrameIndexSDNode>(Addr))
	return false;
	if (Addr.getOpcode() == ISD::TargetExternalSymbol \|\|
	Addr.getOpcode() == ISD::TargetGlobalAddress \|\|
	Addr.getOpcode() == ISD::TargetGlobalTLSAddress)
	return false; // direct calls.

	if (auto *CN = dyn_cast<ConstantSDNode>(Addr)) {
	if (isInt<32>(CN->getSExtValue())) {
	Base = CurDAG->getTargetConstant(0, SDLoc(Addr), MVT::i32);
	Index = CurDAG->getTargetConstant(0, SDLoc(Addr), MVT::i32);
	Offset =
	CurDAG->getTargetConstant(CN->getZExtValue(), SDLoc(Addr), MVT::i32);
	return true;
	}
	}
	return false;
	}

	bool VEDAGToDAGISel::selectADDRri(SDValue Addr, SDValue &Base,
	SDValue &Offset) {
	if (matchADDRri(Addr, Base, Offset))
	return true;

	Base = Addr;
	Offset = CurDAG->getTargetConstant(0, SDLoc(Addr), MVT::i32);
	return true;
	}

	bool VEDAGToDAGISel::selectADDRzi(SDValue Addr, SDValue &Base,
	SDValue &Offset) {
	if (isa<FrameIndexSDNode>(Addr))
	return false;
	if (Addr.getOpcode() == ISD::TargetExternalSymbol \|\|
	Addr.getOpcode() == ISD::TargetGlobalAddress \|\|
	Addr.getOpcode() == ISD::TargetGlobalTLSAddress)
	return false; // direct calls.

	if (auto *CN = dyn_cast<ConstantSDNode>(Addr)) {
	if (isInt<32>(CN->getSExtValue())) {
	Base = CurDAG->getTargetConstant(0, SDLoc(Addr), MVT::i32);
	Offset =
	CurDAG->getTargetConstant(CN->getZExtValue(), SDLoc(Addr), MVT::i32);
	return true;
	}
	}
	return false;
	}

	bool VEDAGToDAGISel::matchADDRrr(SDValue Addr, SDValue &Base, SDValue &Index) {
	if (isa<FrameIndexSDNode>(Addr))
	return false;
	if (Addr.getOpcode() == ISD::TargetExternalSymbol \|\|
	Addr.getOpcode() == ISD::TargetGlobalAddress \|\|
	Addr.getOpcode() == ISD::TargetGlobalTLSAddress)
	return false; // direct calls.

	if (Addr.getOpcode() == ISD::ADD) {
	; // Nothing to do here.
	} else if (Addr.getOpcode() == ISD::OR) {
	// We want to look through a transform in InstCombine and DAGCombiner that
	// turns 'add' into 'or', so we can treat this 'or' exactly like an 'add'.
	if (!CurDAG->haveNoCommonBitsSet(Addr.getOperand(0), Addr.getOperand(1)))
	return false;
	} else {
	return false;
	}

	if (Addr.getOperand(0).getOpcode() == VEISD::Lo \|\|
	Addr.getOperand(1).getOpcode() == VEISD::Lo)
	return false; // Let the LEASL patterns catch this!

	Base = Addr.getOperand(0);
	Index = Addr.getOperand(1);
	return true;
	}

	bool VEDAGToDAGISel::matchADDRri(SDValue Addr, SDValue &Base, SDValue &Offset) {
	auto AddrTy = Addr->getValueType(0);
	if (FrameIndexSDNode *FIN = dyn_cast<FrameIndexSDNode>(Addr)) {
	Base = CurDAG->getTargetFrameIndex(FIN->getIndex(), AddrTy);
	Offset = CurDAG->getTargetConstant(0, SDLoc(Addr), MVT::i32);
	return true;
	}
	if (Addr.getOpcode() == ISD::TargetExternalSymbol \|\|
	Addr.getOpcode() == ISD::TargetGlobalAddress \|\|
	Addr.getOpcode() == ISD::TargetGlobalTLSAddress)
	return false; // direct calls.

	if (CurDAG->isBaseWithConstantOffset(Addr)) {
	ConstantSDNode *CN = cast<ConstantSDNode>(Addr.getOperand(1));
	if (isInt<32>(CN->getSExtValue())) {
	if (FrameIndexSDNode *FIN =
	dyn_cast<FrameIndexSDNode>(Addr.getOperand(0))) {
	// Constant offset from frame ref.
	Base = CurDAG->getTargetFrameIndex(FIN->getIndex(), AddrTy);
	} else {
	Base = Addr.getOperand(0);
	}
	Offset =
	CurDAG->getTargetConstant(CN->getZExtValue(), SDLoc(Addr), MVT::i32);
	return true;
	}
	}
	return false;
	}

	void VEDAGToDAGISel::Select(SDNode *N) {
	SDLoc dl(N);
	if (N->isMachineOpcode()) {
	N->setNodeId(-1);
	return; // Already selected.
	}

	switch (N->getOpcode()) {

	// Late eliminate the LEGALAVL wrapper
	case VEISD::LEGALAVL:
	ReplaceNode(N, N->getOperand(0).getNode());
	return;

	// Lower (broadcast 1) and (broadcast 0) to VM[P]0
	case VEISD::VEC_BROADCAST: {
	MVT SplatResTy = N->getSimpleValueType(0);
	if (SplatResTy.getVectorElementType() != MVT::i1)
	break;

	// Constant non-zero broadcast.
	auto BConst = dyn_cast<ConstantSDNode>(N->getOperand(0));
	if (!BConst)
	break;
	bool BCTrueMask = (BConst->getSExtValue() != 0);
	if (!BCTrueMask)
	break;

	// Packed or non-packed.
	SDValue New;
	if (SplatResTy.getVectorNumElements() == StandardVectorWidth) {
	New = CurDAG->getCopyFromReg(CurDAG->getEntryNode(), SDLoc(N), VE::VM0,
	MVT::v256i1);
	} else if (SplatResTy.getVectorNumElements() == PackedVectorWidth) {
	New = CurDAG->getCopyFromReg(CurDAG->getEntryNode(), SDLoc(N), VE::VMP0,
	MVT::v512i1);
	} else
	break;

	// Replace.
	ReplaceNode(N, New.getNode());
	return;
	}

	case VEISD::GLOBAL_BASE_REG:
	ReplaceNode(N, getGlobalBaseReg());
	return;
	}

	SelectCode(N);
	}

	/// SelectInlineAsmMemoryOperand - Implement addressing mode selection for
	/// inline asm expressions.
	bool VEDAGToDAGISel::SelectInlineAsmMemoryOperand(
	const SDValue &Op, InlineAsm::ConstraintCode ConstraintID,
	std::vector<SDValue> &OutOps) {
	SDValue Op0, Op1;
	switch (ConstraintID) {
	default:
	llvm_unreachable("Unexpected asm memory constraint");
	case InlineAsm::ConstraintCode::o:
	case InlineAsm::ConstraintCode::m: // memory
	// Try to match ADDRri since reg+imm style is safe for all VE instructions
	// with a memory operand.
	if (selectADDRri(Op, Op0, Op1)) {
	OutOps.push_back(Op0);
	OutOps.push_back(Op1);
	return false;
	}
	// Otherwise, require the address to be in a register and immediate 0.
	OutOps.push_back(Op);
	OutOps.push_back(CurDAG->getTargetConstant(0, SDLoc(Op), MVT::i32));
	return false;
	}
	return true;
	}

	SDNode *VEDAGToDAGISel::getGlobalBaseReg() {
	Register GlobalBaseReg = Subtarget->getInstrInfo()->getGlobalBaseReg(MF);
	return CurDAG
	->getRegister(GlobalBaseReg, TLI->getPointerTy(CurDAG->getDataLayout()))
	.getNode();
	}

	/// createVEISelDag - This pass converts a legalized DAG into a
	/// VE-specific DAG, ready for instruction scheduling.
	///
	FunctionPass *llvm::createVEISelDag(VETargetMachine &TM) {
	return new VEDAGToDAGISel(TM);
	}