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//===-- PPCISelDAGToDAG.cpp - PPC --pattern matching inst selector --------===//
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// The LLVM Compiler Infrastructure
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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//===----------------------------------------------------------------------===//
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// This file defines a pattern matching instruction selector for PowerPC,
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// converting from a legalized dag to a PPC dag.
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "ppc-codegen"
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#include "PPCPredicates.h"
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#include "PPCTargetMachine.h"
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#include "PPCISelLowering.h"
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#include "PPCHazardRecognizers.h"
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#include "llvm/CodeGen/MachineInstrBuilder.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/MachineFunctionAnalysis.h"
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#include "llvm/CodeGen/MachineRegisterInfo.h"
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#include "llvm/CodeGen/SelectionDAG.h"
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#include "llvm/CodeGen/SelectionDAGISel.h"
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#include "llvm/Target/TargetOptions.h"
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#include "llvm/Constants.h"
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#include "llvm/Function.h"
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#include "llvm/GlobalValue.h"
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#include "llvm/Intrinsics.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/MathExtras.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/raw_ostream.h"
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//===--------------------------------------------------------------------===//
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/// PPCDAGToDAGISel - PPC specific code to select PPC machine
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/// instructions for SelectionDAG operations.
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class PPCDAGToDAGISel : public SelectionDAGISel {
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PPCTargetLowering &PPCLowering;
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const PPCSubtarget &PPCSubTarget;
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unsigned GlobalBaseReg;
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explicit PPCDAGToDAGISel(PPCTargetMachine &tm)
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: SelectionDAGISel(tm), TM(tm),
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PPCLowering(*TM.getTargetLowering()),
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PPCSubTarget(*TM.getSubtargetImpl()) {}
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virtual bool runOnMachineFunction(MachineFunction &MF) {
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// Make sure we re-emit a set of the global base reg if necessary
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SelectionDAGISel::runOnMachineFunction(MF);
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/// getI32Imm - Return a target constant with the specified value, of type
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inline SDValue getI32Imm(unsigned Imm) {
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return CurDAG->getTargetConstant(Imm, MVT::i32);
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/// getI64Imm - Return a target constant with the specified value, of type
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inline SDValue getI64Imm(uint64_t Imm) {
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return CurDAG->getTargetConstant(Imm, MVT::i64);
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/// getSmallIPtrImm - Return a target constant of pointer type.
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inline SDValue getSmallIPtrImm(unsigned Imm) {
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return CurDAG->getTargetConstant(Imm, PPCLowering.getPointerTy());
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/// isRunOfOnes - Returns true iff Val consists of one contiguous run of 1s
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/// with any number of 0s on either side. The 1s are allowed to wrap from
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/// LSB to MSB, so 0x000FFF0, 0x0000FFFF, and 0xFF0000FF are all runs.
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/// 0x0F0F0000 is not, since all 1s are not contiguous.
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static bool isRunOfOnes(unsigned Val, unsigned &MB, unsigned &ME);
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/// isRotateAndMask - Returns true if Mask and Shift can be folded into a
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/// rotate and mask opcode and mask operation.
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static bool isRotateAndMask(SDNode *N, unsigned Mask, bool isShiftMask,
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unsigned &SH, unsigned &MB, unsigned &ME);
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/// getGlobalBaseReg - insert code into the entry mbb to materialize the PIC
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/// base register. Return the virtual register that holds this value.
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SDNode *getGlobalBaseReg();
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// Select - Convert the specified operand from a target-independent to a
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// target-specific node if it hasn't already been changed.
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SDNode *Select(SDNode *N);
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SDNode *SelectBitfieldInsert(SDNode *N);
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/// SelectCC - Select a comparison of the specified values with the
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/// specified condition code, returning the CR# of the expression.
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SDValue SelectCC(SDValue LHS, SDValue RHS, ISD::CondCode CC, DebugLoc dl);
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/// SelectAddrImm - Returns true if the address N can be represented by
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/// a base register plus a signed 16-bit displacement [r+imm].
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bool SelectAddrImm(SDNode *Op, SDValue N, SDValue &Disp,
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return PPCLowering.SelectAddressRegImm(N, Disp, Base, *CurDAG);
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/// SelectAddrImmOffs - Return true if the operand is valid for a preinc
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/// immediate field. Because preinc imms have already been validated, just
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bool SelectAddrImmOffs(SDNode *Op, SDValue N, SDValue &Out) const {
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/// SelectAddrIdx - Given the specified addressed, check to see if it can be
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/// represented as an indexed [r+r] operation. Returns false if it can
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/// be represented by [r+imm], which are preferred.
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bool SelectAddrIdx(SDNode *Op, SDValue N, SDValue &Base,
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return PPCLowering.SelectAddressRegReg(N, Base, Index, *CurDAG);
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/// SelectAddrIdxOnly - Given the specified addressed, force it to be
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/// represented as an indexed [r+r] operation.
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bool SelectAddrIdxOnly(SDNode *Op, SDValue N, SDValue &Base,
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return PPCLowering.SelectAddressRegRegOnly(N, Base, Index, *CurDAG);
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/// SelectAddrImmShift - Returns true if the address N can be represented by
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/// a base register plus a signed 14-bit displacement [r+imm*4]. Suitable
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/// for use by STD and friends.
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bool SelectAddrImmShift(SDNode *Op, SDValue N, SDValue &Disp,
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return PPCLowering.SelectAddressRegImmShift(N, Disp, Base, *CurDAG);
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/// SelectInlineAsmMemoryOperand - Implement addressing mode selection for
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/// inline asm expressions. It is always correct to compute the value into
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/// a register. The case of adding a (possibly relocatable) constant to a
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/// register can be improved, but it is wrong to substitute Reg+Reg for
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/// Reg in an asm, because the load or store opcode would have to change.
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virtual bool SelectInlineAsmMemoryOperand(const SDValue &Op,
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std::vector<SDValue> &OutOps) {
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OutOps.push_back(Op);
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SDValue BuildSDIVSequence(SDNode *N);
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SDValue BuildUDIVSequence(SDNode *N);
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void InsertVRSaveCode(MachineFunction &MF);
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virtual const char *getPassName() const {
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return "PowerPC DAG->DAG Pattern Instruction Selection";
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/// CreateTargetHazardRecognizer - Return the hazard recognizer to use for
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/// this target when scheduling the DAG.
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virtual ScheduleHazardRecognizer *CreateTargetHazardRecognizer() {
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// Should use subtarget info to pick the right hazard recognizer. For
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// now, always return a PPC970 recognizer.
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const TargetInstrInfo *II = TM.getInstrInfo();
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assert(II && "No InstrInfo?");
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return new PPCHazardRecognizer970(*II);
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// Include the pieces autogenerated from the target description.
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#include "PPCGenDAGISel.inc"
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SDNode *SelectSETCC(SDNode *N);
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/// InsertVRSaveCode - Once the entire function has been instruction selected,
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/// all virtual registers are created and all machine instructions are built,
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/// check to see if we need to save/restore VRSAVE. If so, do it.
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void PPCDAGToDAGISel::InsertVRSaveCode(MachineFunction &Fn) {
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// Check to see if this function uses vector registers, which means we have to
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// save and restore the VRSAVE register and update it with the regs we use.
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// In this case, there will be virtual registers of vector type created
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// by the scheduler. Detect them now.
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bool HasVectorVReg = false;
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for (unsigned i = TargetRegisterInfo::FirstVirtualRegister,
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e = RegInfo->getLastVirtReg()+1; i != e; ++i)
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if (RegInfo->getRegClass(i) == &PPC::VRRCRegClass) {
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HasVectorVReg = true;
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if (!HasVectorVReg) return; // nothing to do.
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// If we have a vector register, we want to emit code into the entry and exit
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// blocks to save and restore the VRSAVE register. We do this here (instead
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// of marking all vector instructions as clobbering VRSAVE) for two reasons:
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// 1. This (trivially) reduces the load on the register allocator, by not
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// having to represent the live range of the VRSAVE register.
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// 2. This (more significantly) allows us to create a temporary virtual
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// register to hold the saved VRSAVE value, allowing this temporary to be
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// register allocated, instead of forcing it to be spilled to the stack.
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// Create two vregs - one to hold the VRSAVE register that is live-in to the
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// function and one for the value after having bits or'd into it.
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unsigned InVRSAVE = RegInfo->createVirtualRegister(&PPC::GPRCRegClass);
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unsigned UpdatedVRSAVE = RegInfo->createVirtualRegister(&PPC::GPRCRegClass);
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const TargetInstrInfo &TII = *TM.getInstrInfo();
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MachineBasicBlock &EntryBB = *Fn.begin();
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DebugLoc dl = DebugLoc::getUnknownLoc();
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// Emit the following code into the entry block:
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// InVRSAVE = MFVRSAVE
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// UpdatedVRSAVE = UPDATE_VRSAVE InVRSAVE
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// MTVRSAVE UpdatedVRSAVE
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MachineBasicBlock::iterator IP = EntryBB.begin(); // Insert Point
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BuildMI(EntryBB, IP, dl, TII.get(PPC::MFVRSAVE), InVRSAVE);
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BuildMI(EntryBB, IP, dl, TII.get(PPC::UPDATE_VRSAVE),
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UpdatedVRSAVE).addReg(InVRSAVE);
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BuildMI(EntryBB, IP, dl, TII.get(PPC::MTVRSAVE)).addReg(UpdatedVRSAVE);
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// Find all return blocks, outputting a restore in each epilog.
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for (MachineFunction::iterator BB = Fn.begin(), E = Fn.end(); BB != E; ++BB) {
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if (!BB->empty() && BB->back().getDesc().isReturn()) {
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IP = BB->end(); --IP;
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// Skip over all terminator instructions, which are part of the return
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MachineBasicBlock::iterator I2 = IP;
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while (I2 != BB->begin() && (--I2)->getDesc().isTerminator())
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// Emit: MTVRSAVE InVRSave
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BuildMI(*BB, IP, dl, TII.get(PPC::MTVRSAVE)).addReg(InVRSAVE);
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/// getGlobalBaseReg - Output the instructions required to put the
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/// base address to use for accessing globals into a register.
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SDNode *PPCDAGToDAGISel::getGlobalBaseReg() {
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if (!GlobalBaseReg) {
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const TargetInstrInfo &TII = *TM.getInstrInfo();
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// Insert the set of GlobalBaseReg into the first MBB of the function
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MachineBasicBlock &FirstMBB = MF->front();
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MachineBasicBlock::iterator MBBI = FirstMBB.begin();
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DebugLoc dl = DebugLoc::getUnknownLoc();
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if (PPCLowering.getPointerTy() == MVT::i32) {
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GlobalBaseReg = RegInfo->createVirtualRegister(PPC::GPRCRegisterClass);
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BuildMI(FirstMBB, MBBI, dl, TII.get(PPC::MovePCtoLR), PPC::LR);
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BuildMI(FirstMBB, MBBI, dl, TII.get(PPC::MFLR), GlobalBaseReg);
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GlobalBaseReg = RegInfo->createVirtualRegister(PPC::G8RCRegisterClass);
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BuildMI(FirstMBB, MBBI, dl, TII.get(PPC::MovePCtoLR8), PPC::LR8);
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BuildMI(FirstMBB, MBBI, dl, TII.get(PPC::MFLR8), GlobalBaseReg);
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return CurDAG->getRegister(GlobalBaseReg,
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PPCLowering.getPointerTy()).getNode();
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/// isIntS16Immediate - This method tests to see if the node is either a 32-bit
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/// or 64-bit immediate, and if the value can be accurately represented as a
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/// sign extension from a 16-bit value. If so, this returns true and the
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static bool isIntS16Immediate(SDNode *N, short &Imm) {
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if (N->getOpcode() != ISD::Constant)
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Imm = (short)cast<ConstantSDNode>(N)->getZExtValue();
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if (N->getValueType(0) == MVT::i32)
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return Imm == (int32_t)cast<ConstantSDNode>(N)->getZExtValue();
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return Imm == (int64_t)cast<ConstantSDNode>(N)->getZExtValue();
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static bool isIntS16Immediate(SDValue Op, short &Imm) {
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return isIntS16Immediate(Op.getNode(), Imm);
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/// isInt32Immediate - This method tests to see if the node is a 32-bit constant
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/// operand. If so Imm will receive the 32-bit value.
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static bool isInt32Immediate(SDNode *N, unsigned &Imm) {
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if (N->getOpcode() == ISD::Constant && N->getValueType(0) == MVT::i32) {
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Imm = cast<ConstantSDNode>(N)->getZExtValue();
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/// isInt64Immediate - This method tests to see if the node is a 64-bit constant
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/// operand. If so Imm will receive the 64-bit value.
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static bool isInt64Immediate(SDNode *N, uint64_t &Imm) {
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if (N->getOpcode() == ISD::Constant && N->getValueType(0) == MVT::i64) {
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Imm = cast<ConstantSDNode>(N)->getZExtValue();
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// isInt32Immediate - This method tests to see if a constant operand.
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// If so Imm will receive the 32 bit value.
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static bool isInt32Immediate(SDValue N, unsigned &Imm) {
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return isInt32Immediate(N.getNode(), Imm);
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// isOpcWithIntImmediate - This method tests to see if the node is a specific
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// opcode and that it has a immediate integer right operand.
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// If so Imm will receive the 32 bit value.
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static bool isOpcWithIntImmediate(SDNode *N, unsigned Opc, unsigned& Imm) {
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return N->getOpcode() == Opc
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&& isInt32Immediate(N->getOperand(1).getNode(), Imm);
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bool PPCDAGToDAGISel::isRunOfOnes(unsigned Val, unsigned &MB, unsigned &ME) {
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if (isShiftedMask_32(Val)) {
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// look for the first non-zero bit
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MB = CountLeadingZeros_32(Val);
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// look for the first zero bit after the run of ones
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ME = CountLeadingZeros_32((Val - 1) ^ Val);
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Val = ~Val; // invert mask
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if (isShiftedMask_32(Val)) {
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// effectively look for the first zero bit
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ME = CountLeadingZeros_32(Val) - 1;
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// effectively look for the first one bit after the run of zeros
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MB = CountLeadingZeros_32((Val - 1) ^ Val) + 1;
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bool PPCDAGToDAGISel::isRotateAndMask(SDNode *N, unsigned Mask,
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bool isShiftMask, unsigned &SH,
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unsigned &MB, unsigned &ME) {
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// Don't even go down this path for i64, since different logic will be
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// necessary for rldicl/rldicr/rldimi.
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if (N->getValueType(0) != MVT::i32)
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unsigned Indeterminant = ~0; // bit mask marking indeterminant results
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unsigned Opcode = N->getOpcode();
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if (N->getNumOperands() != 2 ||
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!isInt32Immediate(N->getOperand(1).getNode(), Shift) || (Shift > 31))
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if (Opcode == ISD::SHL) {
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// apply shift left to mask if it comes first
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if (isShiftMask) Mask = Mask << Shift;
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// determine which bits are made indeterminant by shift
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Indeterminant = ~(0xFFFFFFFFu << Shift);
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} else if (Opcode == ISD::SRL) {
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// apply shift right to mask if it comes first
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if (isShiftMask) Mask = Mask >> Shift;
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// determine which bits are made indeterminant by shift
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Indeterminant = ~(0xFFFFFFFFu >> Shift);
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// adjust for the left rotate
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} else if (Opcode == ISD::ROTL) {
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// if the mask doesn't intersect any Indeterminant bits
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if (Mask && !(Mask & Indeterminant)) {
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// make sure the mask is still a mask (wrap arounds may not be)
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return isRunOfOnes(Mask, MB, ME);
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/// SelectBitfieldInsert - turn an or of two masked values into
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/// the rotate left word immediate then mask insert (rlwimi) instruction.
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SDNode *PPCDAGToDAGISel::SelectBitfieldInsert(SDNode *N) {
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SDValue Op0 = N->getOperand(0);
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SDValue Op1 = N->getOperand(1);
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DebugLoc dl = N->getDebugLoc();
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APInt LKZ, LKO, RKZ, RKO;
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CurDAG->ComputeMaskedBits(Op0, APInt::getAllOnesValue(32), LKZ, LKO);
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CurDAG->ComputeMaskedBits(Op1, APInt::getAllOnesValue(32), RKZ, RKO);
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unsigned TargetMask = LKZ.getZExtValue();
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unsigned InsertMask = RKZ.getZExtValue();
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if ((TargetMask | InsertMask) == 0xFFFFFFFF) {
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unsigned Op0Opc = Op0.getOpcode();
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unsigned Op1Opc = Op1.getOpcode();
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unsigned Value, SH = 0;
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TargetMask = ~TargetMask;
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InsertMask = ~InsertMask;
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// If the LHS has a foldable shift and the RHS does not, then swap it to the
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// RHS so that we can fold the shift into the insert.
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if (Op0Opc == ISD::AND && Op1Opc == ISD::AND) {
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if (Op0.getOperand(0).getOpcode() == ISD::SHL ||
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Op0.getOperand(0).getOpcode() == ISD::SRL) {
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if (Op1.getOperand(0).getOpcode() != ISD::SHL &&
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Op1.getOperand(0).getOpcode() != ISD::SRL) {
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std::swap(Op0Opc, Op1Opc);
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std::swap(TargetMask, InsertMask);
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} else if (Op0Opc == ISD::SHL || Op0Opc == ISD::SRL) {
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if (Op1Opc == ISD::AND && Op1.getOperand(0).getOpcode() != ISD::SHL &&
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Op1.getOperand(0).getOpcode() != ISD::SRL) {
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std::swap(Op0Opc, Op1Opc);
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std::swap(TargetMask, InsertMask);
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if (InsertMask && isRunOfOnes(InsertMask, MB, ME)) {
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if ((Op1Opc == ISD::SHL || Op1Opc == ISD::SRL) &&
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isInt32Immediate(Op1.getOperand(1), Value)) {
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Op1 = Op1.getOperand(0);
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SH = (Op1Opc == ISD::SHL) ? Value : 32 - Value;
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if (Op1Opc == ISD::AND) {
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unsigned SHOpc = Op1.getOperand(0).getOpcode();
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if ((SHOpc == ISD::SHL || SHOpc == ISD::SRL) &&
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isInt32Immediate(Op1.getOperand(0).getOperand(1), Value)) {
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Op1 = Op1.getOperand(0).getOperand(0);
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SH = (SHOpc == ISD::SHL) ? Value : 32 - Value;
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Op1 = Op1.getOperand(0);
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SDValue Ops[] = { Op0, Op1, getI32Imm(SH), getI32Imm(MB),
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return CurDAG->getMachineNode(PPC::RLWIMI, dl, MVT::i32, Ops, 5);
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/// SelectCC - Select a comparison of the specified values with the specified
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/// condition code, returning the CR# of the expression.
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SDValue PPCDAGToDAGISel::SelectCC(SDValue LHS, SDValue RHS,
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ISD::CondCode CC, DebugLoc dl) {
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// Always select the LHS.
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if (LHS.getValueType() == MVT::i32) {
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if (CC == ISD::SETEQ || CC == ISD::SETNE) {
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if (isInt32Immediate(RHS, Imm)) {
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// SETEQ/SETNE comparison with 16-bit immediate, fold it.
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return SDValue(CurDAG->getMachineNode(PPC::CMPLWI, dl, MVT::i32, LHS,
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getI32Imm(Imm & 0xFFFF)), 0);
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// If this is a 16-bit signed immediate, fold it.
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if (isInt16((int)Imm))
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return SDValue(CurDAG->getMachineNode(PPC::CMPWI, dl, MVT::i32, LHS,
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getI32Imm(Imm & 0xFFFF)), 0);
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// For non-equality comparisons, the default code would materialize the
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// constant, then compare against it, like this:
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// Since we are just comparing for equality, we can emit this instead:
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// xoris r0,r3,0x1234
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// cmplwi cr0,r0,0x5678
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SDValue Xor(CurDAG->getMachineNode(PPC::XORIS, dl, MVT::i32, LHS,
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getI32Imm(Imm >> 16)), 0);
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return SDValue(CurDAG->getMachineNode(PPC::CMPLWI, dl, MVT::i32, Xor,
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getI32Imm(Imm & 0xFFFF)), 0);
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} else if (ISD::isUnsignedIntSetCC(CC)) {
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if (isInt32Immediate(RHS, Imm) && isUInt16(Imm))
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return SDValue(CurDAG->getMachineNode(PPC::CMPLWI, dl, MVT::i32, LHS,
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getI32Imm(Imm & 0xFFFF)), 0);
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if (isIntS16Immediate(RHS, SImm))
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return SDValue(CurDAG->getMachineNode(PPC::CMPWI, dl, MVT::i32, LHS,
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getI32Imm((int)SImm & 0xFFFF)),
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} else if (LHS.getValueType() == MVT::i64) {
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if (CC == ISD::SETEQ || CC == ISD::SETNE) {
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if (isInt64Immediate(RHS.getNode(), Imm)) {
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// SETEQ/SETNE comparison with 16-bit immediate, fold it.
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return SDValue(CurDAG->getMachineNode(PPC::CMPLDI, dl, MVT::i64, LHS,
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getI32Imm(Imm & 0xFFFF)), 0);
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// If this is a 16-bit signed immediate, fold it.
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return SDValue(CurDAG->getMachineNode(PPC::CMPDI, dl, MVT::i64, LHS,
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getI32Imm(Imm & 0xFFFF)), 0);
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// For non-equality comparisons, the default code would materialize the
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// constant, then compare against it, like this:
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// Since we are just comparing for equality, we can emit this instead:
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// xoris r0,r3,0x1234
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// cmpldi cr0,r0,0x5678
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SDValue Xor(CurDAG->getMachineNode(PPC::XORIS8, dl, MVT::i64, LHS,
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getI64Imm(Imm >> 16)), 0);
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return SDValue(CurDAG->getMachineNode(PPC::CMPLDI, dl, MVT::i64, Xor,
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getI64Imm(Imm & 0xFFFF)), 0);
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} else if (ISD::isUnsignedIntSetCC(CC)) {
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if (isInt64Immediate(RHS.getNode(), Imm) && isUInt16(Imm))
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return SDValue(CurDAG->getMachineNode(PPC::CMPLDI, dl, MVT::i64, LHS,
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getI64Imm(Imm & 0xFFFF)), 0);
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if (isIntS16Immediate(RHS, SImm))
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return SDValue(CurDAG->getMachineNode(PPC::CMPDI, dl, MVT::i64, LHS,
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getI64Imm(SImm & 0xFFFF)),
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} else if (LHS.getValueType() == MVT::f32) {
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assert(LHS.getValueType() == MVT::f64 && "Unknown vt!");
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return SDValue(CurDAG->getMachineNode(Opc, dl, MVT::i32, LHS, RHS), 0);
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static PPC::Predicate getPredicateForSetCC(ISD::CondCode CC) {
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llvm_unreachable("Should be lowered by legalize!");
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default: llvm_unreachable("Unknown condition!");
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case ISD::SETEQ: return PPC::PRED_EQ;
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case ISD::SETNE: return PPC::PRED_NE;
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case ISD::SETLT: return PPC::PRED_LT;
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case ISD::SETLE: return PPC::PRED_LE;
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case ISD::SETGT: return PPC::PRED_GT;
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case ISD::SETGE: return PPC::PRED_GE;
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case ISD::SETO: return PPC::PRED_NU;
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case ISD::SETUO: return PPC::PRED_UN;
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// These two are invalid for floating point. Assume we have int.
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case ISD::SETULT: return PPC::PRED_LT;
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case ISD::SETUGT: return PPC::PRED_GT;
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/// getCRIdxForSetCC - Return the index of the condition register field
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/// associated with the SetCC condition, and whether or not the field is
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/// treated as inverted. That is, lt = 0; ge = 0 inverted.
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/// If this returns with Other != -1, then the returned comparison is an or of
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/// two simpler comparisons. In this case, Invert is guaranteed to be false.
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static unsigned getCRIdxForSetCC(ISD::CondCode CC, bool &Invert, int &Other) {
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default: llvm_unreachable("Unknown condition!");
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case ISD::SETLT: return 0; // Bit #0 = SETOLT
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case ISD::SETGT: return 1; // Bit #1 = SETOGT
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case ISD::SETEQ: return 2; // Bit #2 = SETOEQ
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case ISD::SETUO: return 3; // Bit #3 = SETUO
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case ISD::SETGE: Invert = true; return 0; // !Bit #0 = SETUGE
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case ISD::SETLE: Invert = true; return 1; // !Bit #1 = SETULE
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case ISD::SETNE: Invert = true; return 2; // !Bit #2 = SETUNE
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case ISD::SETO: Invert = true; return 3; // !Bit #3 = SETO
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llvm_unreachable("Invalid branch code: should be expanded by legalize");
619
// These are invalid for floating point. Assume integer.
620
case ISD::SETULT: return 0;
621
case ISD::SETUGT: return 1;
626
SDNode *PPCDAGToDAGISel::SelectSETCC(SDNode *N) {
627
DebugLoc dl = N->getDebugLoc();
629
ISD::CondCode CC = cast<CondCodeSDNode>(N->getOperand(2))->get();
630
if (isInt32Immediate(N->getOperand(1), Imm)) {
631
// We can codegen setcc op, imm very efficiently compared to a brcond.
632
// Check for those cases here.
635
SDValue Op = N->getOperand(0);
639
Op = SDValue(CurDAG->getMachineNode(PPC::CNTLZW, dl, MVT::i32, Op), 0);
640
SDValue Ops[] = { Op, getI32Imm(27), getI32Imm(5), getI32Imm(31) };
641
return CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, Ops, 4);
645
SDValue(CurDAG->getMachineNode(PPC::ADDIC, dl, MVT::i32, MVT::Flag,
646
Op, getI32Imm(~0U)), 0);
647
return CurDAG->SelectNodeTo(N, PPC::SUBFE, MVT::i32, AD, Op,
651
SDValue Ops[] = { Op, getI32Imm(1), getI32Imm(31), getI32Imm(31) };
652
return CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, Ops, 4);
656
SDValue(CurDAG->getMachineNode(PPC::NEG, dl, MVT::i32, Op), 0);
657
T = SDValue(CurDAG->getMachineNode(PPC::ANDC, dl, MVT::i32, T, Op), 0);
658
SDValue Ops[] = { T, getI32Imm(1), getI32Imm(31), getI32Imm(31) };
659
return CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, Ops, 4);
662
} else if (Imm == ~0U) { // setcc op, -1
663
SDValue Op = N->getOperand(0);
667
Op = SDValue(CurDAG->getMachineNode(PPC::ADDIC, dl, MVT::i32, MVT::Flag,
668
Op, getI32Imm(1)), 0);
669
return CurDAG->SelectNodeTo(N, PPC::ADDZE, MVT::i32,
670
SDValue(CurDAG->getMachineNode(PPC::LI, dl,
675
Op = SDValue(CurDAG->getMachineNode(PPC::NOR, dl, MVT::i32, Op, Op), 0);
676
SDNode *AD = CurDAG->getMachineNode(PPC::ADDIC, dl, MVT::i32, MVT::Flag,
678
return CurDAG->SelectNodeTo(N, PPC::SUBFE, MVT::i32, SDValue(AD, 0),
682
SDValue AD = SDValue(CurDAG->getMachineNode(PPC::ADDI, dl, MVT::i32, Op,
684
SDValue AN = SDValue(CurDAG->getMachineNode(PPC::AND, dl, MVT::i32, AD,
686
SDValue Ops[] = { AN, getI32Imm(1), getI32Imm(31), getI32Imm(31) };
687
return CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, Ops, 4);
690
SDValue Ops[] = { Op, getI32Imm(1), getI32Imm(31), getI32Imm(31) };
691
Op = SDValue(CurDAG->getMachineNode(PPC::RLWINM, dl, MVT::i32, Ops, 4),
693
return CurDAG->SelectNodeTo(N, PPC::XORI, MVT::i32, Op,
702
unsigned Idx = getCRIdxForSetCC(CC, Inv, OtherCondIdx);
703
SDValue CCReg = SelectCC(N->getOperand(0), N->getOperand(1), CC, dl);
706
// Force the ccreg into CR7.
707
SDValue CR7Reg = CurDAG->getRegister(PPC::CR7, MVT::i32);
709
SDValue InFlag(0, 0); // Null incoming flag value.
710
CCReg = CurDAG->getCopyToReg(CurDAG->getEntryNode(), dl, CR7Reg, CCReg,
713
if (PPCSubTarget.isGigaProcessor() && OtherCondIdx == -1)
714
IntCR = SDValue(CurDAG->getMachineNode(PPC::MFOCRF, dl, MVT::i32, CR7Reg,
717
IntCR = SDValue(CurDAG->getMachineNode(PPC::MFCR, dl, MVT::i32, CCReg), 0);
719
SDValue Ops[] = { IntCR, getI32Imm((32-(3-Idx)) & 31),
720
getI32Imm(31), getI32Imm(31) };
721
if (OtherCondIdx == -1 && !Inv)
722
return CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, Ops, 4);
724
// Get the specified bit.
726
SDValue(CurDAG->getMachineNode(PPC::RLWINM, dl, MVT::i32, Ops, 4), 0);
728
assert(OtherCondIdx == -1 && "Can't have split plus negation");
729
return CurDAG->SelectNodeTo(N, PPC::XORI, MVT::i32, Tmp, getI32Imm(1));
732
// Otherwise, we have to turn an operation like SETONE -> SETOLT | SETOGT.
733
// We already got the bit for the first part of the comparison (e.g. SETULE).
735
// Get the other bit of the comparison.
736
Ops[1] = getI32Imm((32-(3-OtherCondIdx)) & 31);
738
SDValue(CurDAG->getMachineNode(PPC::RLWINM, dl, MVT::i32, Ops, 4), 0);
740
return CurDAG->SelectNodeTo(N, PPC::OR, MVT::i32, Tmp, OtherCond);
744
// Select - Convert the specified operand from a target-independent to a
745
// target-specific node if it hasn't already been changed.
746
SDNode *PPCDAGToDAGISel::Select(SDNode *N) {
747
DebugLoc dl = N->getDebugLoc();
748
if (N->isMachineOpcode())
749
return NULL; // Already selected.
751
switch (N->getOpcode()) {
754
case ISD::Constant: {
755
if (N->getValueType(0) == MVT::i64) {
757
int64_t Imm = cast<ConstantSDNode>(N)->getZExtValue();
758
// Assume no remaining bits.
759
unsigned Remainder = 0;
760
// Assume no shift required.
763
// If it can't be represented as a 32 bit value.
765
Shift = CountTrailingZeros_64(Imm);
766
int64_t ImmSh = static_cast<uint64_t>(Imm) >> Shift;
768
// If the shifted value fits 32 bits.
769
if (isInt32(ImmSh)) {
770
// Go with the shifted value.
773
// Still stuck with a 64 bit value.
780
// Intermediate operand.
783
// Handle first 32 bits.
784
unsigned Lo = Imm & 0xFFFF;
785
unsigned Hi = (Imm >> 16) & 0xFFFF;
790
Result = CurDAG->getMachineNode(PPC::LI8, dl, MVT::i64, getI32Imm(Lo));
792
// Handle the Hi bits.
793
unsigned OpC = Hi ? PPC::LIS8 : PPC::LI8;
794
Result = CurDAG->getMachineNode(OpC, dl, MVT::i64, getI32Imm(Hi));
796
Result = CurDAG->getMachineNode(PPC::ORI8, dl, MVT::i64,
797
SDValue(Result, 0), getI32Imm(Lo));
800
Result = CurDAG->getMachineNode(PPC::LIS8, dl, MVT::i64, getI32Imm(Hi));
803
// If no shift, we're done.
804
if (!Shift) return Result;
806
// Shift for next step if the upper 32-bits were not zero.
808
Result = CurDAG->getMachineNode(PPC::RLDICR, dl, MVT::i64,
811
getI32Imm(63 - Shift));
814
// Add in the last bits as required.
815
if ((Hi = (Remainder >> 16) & 0xFFFF)) {
816
Result = CurDAG->getMachineNode(PPC::ORIS8, dl, MVT::i64,
817
SDValue(Result, 0), getI32Imm(Hi));
819
if ((Lo = Remainder & 0xFFFF)) {
820
Result = CurDAG->getMachineNode(PPC::ORI8, dl, MVT::i64,
821
SDValue(Result, 0), getI32Imm(Lo));
830
return SelectSETCC(N);
831
case PPCISD::GlobalBaseReg:
832
return getGlobalBaseReg();
834
case ISD::FrameIndex: {
835
int FI = cast<FrameIndexSDNode>(N)->getIndex();
836
SDValue TFI = CurDAG->getTargetFrameIndex(FI, N->getValueType(0));
837
unsigned Opc = N->getValueType(0) == MVT::i32 ? PPC::ADDI : PPC::ADDI8;
839
return CurDAG->SelectNodeTo(N, Opc, N->getValueType(0), TFI,
841
return CurDAG->getMachineNode(Opc, dl, N->getValueType(0), TFI,
846
SDValue InFlag = N->getOperand(1);
847
// Use MFOCRF if supported.
848
if (PPCSubTarget.isGigaProcessor())
849
return CurDAG->getMachineNode(PPC::MFOCRF, dl, MVT::i32,
850
N->getOperand(0), InFlag);
852
return CurDAG->getMachineNode(PPC::MFCR, dl, MVT::i32, InFlag);
856
// FIXME: since this depends on the setting of the carry flag from the srawi
857
// we should really be making notes about that for the scheduler.
858
// FIXME: It sure would be nice if we could cheaply recognize the
859
// srl/add/sra pattern the dag combiner will generate for this as
860
// sra/addze rather than having to handle sdiv ourselves. oh well.
862
if (isInt32Immediate(N->getOperand(1), Imm)) {
863
SDValue N0 = N->getOperand(0);
864
if ((signed)Imm > 0 && isPowerOf2_32(Imm)) {
866
CurDAG->getMachineNode(PPC::SRAWI, dl, MVT::i32, MVT::Flag,
867
N0, getI32Imm(Log2_32(Imm)));
868
return CurDAG->SelectNodeTo(N, PPC::ADDZE, MVT::i32,
869
SDValue(Op, 0), SDValue(Op, 1));
870
} else if ((signed)Imm < 0 && isPowerOf2_32(-Imm)) {
872
CurDAG->getMachineNode(PPC::SRAWI, dl, MVT::i32, MVT::Flag,
873
N0, getI32Imm(Log2_32(-Imm)));
875
SDValue(CurDAG->getMachineNode(PPC::ADDZE, dl, MVT::i32,
876
SDValue(Op, 0), SDValue(Op, 1)),
878
return CurDAG->SelectNodeTo(N, PPC::NEG, MVT::i32, PT);
882
// Other cases are autogenerated.
887
// Handle preincrement loads.
888
LoadSDNode *LD = cast<LoadSDNode>(N);
889
EVT LoadedVT = LD->getMemoryVT();
891
// Normal loads are handled by code generated from the .td file.
892
if (LD->getAddressingMode() != ISD::PRE_INC)
895
SDValue Offset = LD->getOffset();
896
if (isa<ConstantSDNode>(Offset) ||
897
Offset.getOpcode() == ISD::TargetGlobalAddress) {
900
bool isSExt = LD->getExtensionType() == ISD::SEXTLOAD;
901
if (LD->getValueType(0) != MVT::i64) {
902
// Handle PPC32 integer and normal FP loads.
903
assert((!isSExt || LoadedVT == MVT::i16) && "Invalid sext update load");
904
switch (LoadedVT.getSimpleVT().SimpleTy) {
905
default: llvm_unreachable("Invalid PPC load type!");
906
case MVT::f64: Opcode = PPC::LFDU; break;
907
case MVT::f32: Opcode = PPC::LFSU; break;
908
case MVT::i32: Opcode = PPC::LWZU; break;
909
case MVT::i16: Opcode = isSExt ? PPC::LHAU : PPC::LHZU; break;
911
case MVT::i8: Opcode = PPC::LBZU; break;
914
assert(LD->getValueType(0) == MVT::i64 && "Unknown load result type!");
915
assert((!isSExt || LoadedVT == MVT::i16) && "Invalid sext update load");
916
switch (LoadedVT.getSimpleVT().SimpleTy) {
917
default: llvm_unreachable("Invalid PPC load type!");
918
case MVT::i64: Opcode = PPC::LDU; break;
919
case MVT::i32: Opcode = PPC::LWZU8; break;
920
case MVT::i16: Opcode = isSExt ? PPC::LHAU8 : PPC::LHZU8; break;
922
case MVT::i8: Opcode = PPC::LBZU8; break;
926
SDValue Chain = LD->getChain();
927
SDValue Base = LD->getBasePtr();
928
SDValue Ops[] = { Offset, Base, Chain };
930
return CurDAG->getMachineNode(Opcode, dl, LD->getValueType(0),
931
PPCLowering.getPointerTy(),
934
llvm_unreachable("R+R preindex loads not supported yet!");
939
unsigned Imm, Imm2, SH, MB, ME;
941
// If this is an and of a value rotated between 0 and 31 bits and then and'd
942
// with a mask, emit rlwinm
943
if (isInt32Immediate(N->getOperand(1), Imm) &&
944
isRotateAndMask(N->getOperand(0).getNode(), Imm, false, SH, MB, ME)) {
945
SDValue Val = N->getOperand(0).getOperand(0);
946
SDValue Ops[] = { Val, getI32Imm(SH), getI32Imm(MB), getI32Imm(ME) };
947
return CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, Ops, 4);
949
// If this is just a masked value where the input is not handled above, and
950
// is not a rotate-left (handled by a pattern in the .td file), emit rlwinm
951
if (isInt32Immediate(N->getOperand(1), Imm) &&
952
isRunOfOnes(Imm, MB, ME) &&
953
N->getOperand(0).getOpcode() != ISD::ROTL) {
954
SDValue Val = N->getOperand(0);
955
SDValue Ops[] = { Val, getI32Imm(0), getI32Imm(MB), getI32Imm(ME) };
956
return CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, Ops, 4);
958
// AND X, 0 -> 0, not "rlwinm 32".
959
if (isInt32Immediate(N->getOperand(1), Imm) && (Imm == 0)) {
960
ReplaceUses(SDValue(N, 0), N->getOperand(1));
963
// ISD::OR doesn't get all the bitfield insertion fun.
964
// (and (or x, c1), c2) where isRunOfOnes(~(c1^c2)) is a bitfield insert
965
if (isInt32Immediate(N->getOperand(1), Imm) &&
966
N->getOperand(0).getOpcode() == ISD::OR &&
967
isInt32Immediate(N->getOperand(0).getOperand(1), Imm2)) {
970
if (isRunOfOnes(Imm, MB, ME)) {
971
SDValue Ops[] = { N->getOperand(0).getOperand(0),
972
N->getOperand(0).getOperand(1),
973
getI32Imm(0), getI32Imm(MB),getI32Imm(ME) };
974
return CurDAG->getMachineNode(PPC::RLWIMI, dl, MVT::i32, Ops, 5);
978
// Other cases are autogenerated.
982
if (N->getValueType(0) == MVT::i32)
983
if (SDNode *I = SelectBitfieldInsert(N))
986
// Other cases are autogenerated.
989
unsigned Imm, SH, MB, ME;
990
if (isOpcWithIntImmediate(N->getOperand(0).getNode(), ISD::AND, Imm) &&
991
isRotateAndMask(N, Imm, true, SH, MB, ME)) {
992
SDValue Ops[] = { N->getOperand(0).getOperand(0),
993
getI32Imm(SH), getI32Imm(MB), getI32Imm(ME) };
994
return CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, Ops, 4);
997
// Other cases are autogenerated.
1001
unsigned Imm, SH, MB, ME;
1002
if (isOpcWithIntImmediate(N->getOperand(0).getNode(), ISD::AND, Imm) &&
1003
isRotateAndMask(N, Imm, true, SH, MB, ME)) {
1004
SDValue Ops[] = { N->getOperand(0).getOperand(0),
1005
getI32Imm(SH), getI32Imm(MB), getI32Imm(ME) };
1006
return CurDAG->SelectNodeTo(N, PPC::RLWINM, MVT::i32, Ops, 4);
1009
// Other cases are autogenerated.
1012
case ISD::SELECT_CC: {
1013
ISD::CondCode CC = cast<CondCodeSDNode>(N->getOperand(4))->get();
1015
// Handle the setcc cases here. select_cc lhs, 0, 1, 0, cc
1016
if (ConstantSDNode *N1C = dyn_cast<ConstantSDNode>(N->getOperand(1)))
1017
if (ConstantSDNode *N2C = dyn_cast<ConstantSDNode>(N->getOperand(2)))
1018
if (ConstantSDNode *N3C = dyn_cast<ConstantSDNode>(N->getOperand(3)))
1019
if (N1C->isNullValue() && N3C->isNullValue() &&
1020
N2C->getZExtValue() == 1ULL && CC == ISD::SETNE &&
1021
// FIXME: Implement this optzn for PPC64.
1022
N->getValueType(0) == MVT::i32) {
1024
CurDAG->getMachineNode(PPC::ADDIC, dl, MVT::i32, MVT::Flag,
1025
N->getOperand(0), getI32Imm(~0U));
1026
return CurDAG->SelectNodeTo(N, PPC::SUBFE, MVT::i32,
1027
SDValue(Tmp, 0), N->getOperand(0),
1031
SDValue CCReg = SelectCC(N->getOperand(0), N->getOperand(1), CC, dl);
1032
unsigned BROpc = getPredicateForSetCC(CC);
1034
unsigned SelectCCOp;
1035
if (N->getValueType(0) == MVT::i32)
1036
SelectCCOp = PPC::SELECT_CC_I4;
1037
else if (N->getValueType(0) == MVT::i64)
1038
SelectCCOp = PPC::SELECT_CC_I8;
1039
else if (N->getValueType(0) == MVT::f32)
1040
SelectCCOp = PPC::SELECT_CC_F4;
1041
else if (N->getValueType(0) == MVT::f64)
1042
SelectCCOp = PPC::SELECT_CC_F8;
1044
SelectCCOp = PPC::SELECT_CC_VRRC;
1046
SDValue Ops[] = { CCReg, N->getOperand(2), N->getOperand(3),
1048
return CurDAG->SelectNodeTo(N, SelectCCOp, N->getValueType(0), Ops, 4);
1050
case PPCISD::COND_BRANCH: {
1051
// Op #0 is the Chain.
1052
// Op #1 is the PPC::PRED_* number.
1054
// Op #3 is the Dest MBB
1055
// Op #4 is the Flag.
1056
// Prevent PPC::PRED_* from being selected into LI.
1058
getI32Imm(cast<ConstantSDNode>(N->getOperand(1))->getZExtValue());
1059
SDValue Ops[] = { Pred, N->getOperand(2), N->getOperand(3),
1060
N->getOperand(0), N->getOperand(4) };
1061
return CurDAG->SelectNodeTo(N, PPC::BCC, MVT::Other, Ops, 5);
1064
ISD::CondCode CC = cast<CondCodeSDNode>(N->getOperand(1))->get();
1065
SDValue CondCode = SelectCC(N->getOperand(2), N->getOperand(3), CC, dl);
1066
SDValue Ops[] = { getI32Imm(getPredicateForSetCC(CC)), CondCode,
1067
N->getOperand(4), N->getOperand(0) };
1068
return CurDAG->SelectNodeTo(N, PPC::BCC, MVT::Other, Ops, 4);
1071
// FIXME: Should custom lower this.
1072
SDValue Chain = N->getOperand(0);
1073
SDValue Target = N->getOperand(1);
1074
unsigned Opc = Target.getValueType() == MVT::i32 ? PPC::MTCTR : PPC::MTCTR8;
1075
Chain = SDValue(CurDAG->getMachineNode(Opc, dl, MVT::Other, Target,
1077
return CurDAG->SelectNodeTo(N, PPC::BCTR, MVT::Other, Chain);
1081
return SelectCode(N);
1086
/// createPPCISelDag - This pass converts a legalized DAG into a
1087
/// PowerPC-specific DAG, ready for instruction scheduling.
1089
FunctionPass *llvm::createPPCISelDag(PPCTargetMachine &TM) {
1090
return new PPCDAGToDAGISel(TM);