1211 lines
44 KiB
C++
1211 lines
44 KiB
C++
//===-- TargetInstrInfo.cpp - Target Instruction Information --------------===//
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//
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// The LLVM Compiler Infrastructure
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//
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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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//===----------------------------------------------------------------------===//
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//
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// This file implements the TargetInstrInfo class.
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//
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//===----------------------------------------------------------------------===//
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#include "llvm/Target/TargetInstrInfo.h"
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#include "llvm/CodeGen/MachineFrameInfo.h"
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#include "llvm/CodeGen/MachineInstrBuilder.h"
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#include "llvm/CodeGen/MachineMemOperand.h"
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#include "llvm/CodeGen/MachineRegisterInfo.h"
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#include "llvm/CodeGen/PseudoSourceValue.h"
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#include "llvm/CodeGen/ScoreboardHazardRecognizer.h"
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#include "llvm/CodeGen/StackMaps.h"
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#include "llvm/CodeGen/TargetSchedule.h"
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#include "llvm/IR/DataLayout.h"
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#include "llvm/MC/MCAsmInfo.h"
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#include "llvm/MC/MCInstrItineraries.h"
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#include "llvm/Support/CommandLine.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/raw_ostream.h"
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#include "llvm/Target/TargetFrameLowering.h"
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#include "llvm/Target/TargetLowering.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Target/TargetRegisterInfo.h"
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#include <cctype>
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using namespace llvm;
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static cl::opt<bool> DisableHazardRecognizer(
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"disable-sched-hazard", cl::Hidden, cl::init(false),
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cl::desc("Disable hazard detection during preRA scheduling"));
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TargetInstrInfo::~TargetInstrInfo() {
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}
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const TargetRegisterClass*
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TargetInstrInfo::getRegClass(const MCInstrDesc &MCID, unsigned OpNum,
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const TargetRegisterInfo *TRI,
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const MachineFunction &MF) const {
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if (OpNum >= MCID.getNumOperands())
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return nullptr;
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short RegClass = MCID.OpInfo[OpNum].RegClass;
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if (MCID.OpInfo[OpNum].isLookupPtrRegClass())
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return TRI->getPointerRegClass(MF, RegClass);
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// Instructions like INSERT_SUBREG do not have fixed register classes.
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if (RegClass < 0)
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return nullptr;
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// Otherwise just look it up normally.
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return TRI->getRegClass(RegClass);
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}
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/// insertNoop - Insert a noop into the instruction stream at the specified
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/// point.
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void TargetInstrInfo::insertNoop(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator MI) const {
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llvm_unreachable("Target didn't implement insertNoop!");
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}
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/// Measure the specified inline asm to determine an approximation of its
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/// length.
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/// Comments (which run till the next SeparatorString or newline) do not
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/// count as an instruction.
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/// Any other non-whitespace text is considered an instruction, with
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/// multiple instructions separated by SeparatorString or newlines.
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/// Variable-length instructions are not handled here; this function
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/// may be overloaded in the target code to do that.
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unsigned TargetInstrInfo::getInlineAsmLength(const char *Str,
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const MCAsmInfo &MAI) const {
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// Count the number of instructions in the asm.
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bool atInsnStart = true;
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unsigned Length = 0;
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for (; *Str; ++Str) {
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if (*Str == '\n' || strncmp(Str, MAI.getSeparatorString(),
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strlen(MAI.getSeparatorString())) == 0)
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atInsnStart = true;
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if (atInsnStart && !std::isspace(static_cast<unsigned char>(*Str))) {
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Length += MAI.getMaxInstLength();
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atInsnStart = false;
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}
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if (atInsnStart && strncmp(Str, MAI.getCommentString(),
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strlen(MAI.getCommentString())) == 0)
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atInsnStart = false;
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}
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return Length;
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}
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/// ReplaceTailWithBranchTo - Delete the instruction OldInst and everything
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/// after it, replacing it with an unconditional branch to NewDest.
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void
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TargetInstrInfo::ReplaceTailWithBranchTo(MachineBasicBlock::iterator Tail,
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MachineBasicBlock *NewDest) const {
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MachineBasicBlock *MBB = Tail->getParent();
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// Remove all the old successors of MBB from the CFG.
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while (!MBB->succ_empty())
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MBB->removeSuccessor(MBB->succ_begin());
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// Remove all the dead instructions from the end of MBB.
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MBB->erase(Tail, MBB->end());
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// If MBB isn't immediately before MBB, insert a branch to it.
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if (++MachineFunction::iterator(MBB) != MachineFunction::iterator(NewDest))
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InsertBranch(*MBB, NewDest, nullptr, SmallVector<MachineOperand, 0>(),
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Tail->getDebugLoc());
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MBB->addSuccessor(NewDest);
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}
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MachineInstr *TargetInstrInfo::commuteInstructionImpl(MachineInstr *MI,
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bool NewMI,
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unsigned Idx1,
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unsigned Idx2) const {
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const MCInstrDesc &MCID = MI->getDesc();
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bool HasDef = MCID.getNumDefs();
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if (HasDef && !MI->getOperand(0).isReg())
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// No idea how to commute this instruction. Target should implement its own.
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return nullptr;
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unsigned CommutableOpIdx1 = Idx1; (void)CommutableOpIdx1;
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unsigned CommutableOpIdx2 = Idx2; (void)CommutableOpIdx2;
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assert(findCommutedOpIndices(MI, CommutableOpIdx1, CommutableOpIdx2) &&
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CommutableOpIdx1 == Idx1 && CommutableOpIdx2 == Idx2 &&
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"TargetInstrInfo::CommuteInstructionImpl(): not commutable operands.");
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assert(MI->getOperand(Idx1).isReg() && MI->getOperand(Idx2).isReg() &&
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"This only knows how to commute register operands so far");
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unsigned Reg0 = HasDef ? MI->getOperand(0).getReg() : 0;
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unsigned Reg1 = MI->getOperand(Idx1).getReg();
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unsigned Reg2 = MI->getOperand(Idx2).getReg();
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unsigned SubReg0 = HasDef ? MI->getOperand(0).getSubReg() : 0;
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unsigned SubReg1 = MI->getOperand(Idx1).getSubReg();
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unsigned SubReg2 = MI->getOperand(Idx2).getSubReg();
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bool Reg1IsKill = MI->getOperand(Idx1).isKill();
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bool Reg2IsKill = MI->getOperand(Idx2).isKill();
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bool Reg1IsUndef = MI->getOperand(Idx1).isUndef();
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bool Reg2IsUndef = MI->getOperand(Idx2).isUndef();
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bool Reg1IsInternal = MI->getOperand(Idx1).isInternalRead();
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bool Reg2IsInternal = MI->getOperand(Idx2).isInternalRead();
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// If destination is tied to either of the commuted source register, then
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// it must be updated.
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if (HasDef && Reg0 == Reg1 &&
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MI->getDesc().getOperandConstraint(Idx1, MCOI::TIED_TO) == 0) {
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Reg2IsKill = false;
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Reg0 = Reg2;
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SubReg0 = SubReg2;
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} else if (HasDef && Reg0 == Reg2 &&
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MI->getDesc().getOperandConstraint(Idx2, MCOI::TIED_TO) == 0) {
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Reg1IsKill = false;
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Reg0 = Reg1;
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SubReg0 = SubReg1;
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}
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if (NewMI) {
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// Create a new instruction.
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MachineFunction &MF = *MI->getParent()->getParent();
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MI = MF.CloneMachineInstr(MI);
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}
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if (HasDef) {
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MI->getOperand(0).setReg(Reg0);
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MI->getOperand(0).setSubReg(SubReg0);
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}
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MI->getOperand(Idx2).setReg(Reg1);
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MI->getOperand(Idx1).setReg(Reg2);
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MI->getOperand(Idx2).setSubReg(SubReg1);
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MI->getOperand(Idx1).setSubReg(SubReg2);
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MI->getOperand(Idx2).setIsKill(Reg1IsKill);
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MI->getOperand(Idx1).setIsKill(Reg2IsKill);
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MI->getOperand(Idx2).setIsUndef(Reg1IsUndef);
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MI->getOperand(Idx1).setIsUndef(Reg2IsUndef);
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MI->getOperand(Idx2).setIsInternalRead(Reg1IsInternal);
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MI->getOperand(Idx1).setIsInternalRead(Reg2IsInternal);
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return MI;
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}
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MachineInstr *TargetInstrInfo::commuteInstruction(MachineInstr *MI,
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bool NewMI,
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unsigned OpIdx1,
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unsigned OpIdx2) const {
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// If OpIdx1 or OpIdx2 is not specified, then this method is free to choose
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// any commutable operand, which is done in findCommutedOpIndices() method
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// called below.
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if ((OpIdx1 == CommuteAnyOperandIndex || OpIdx2 == CommuteAnyOperandIndex) &&
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!findCommutedOpIndices(MI, OpIdx1, OpIdx2)) {
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assert(MI->isCommutable() &&
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"Precondition violation: MI must be commutable.");
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return nullptr;
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}
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return commuteInstructionImpl(MI, NewMI, OpIdx1, OpIdx2);
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}
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bool TargetInstrInfo::fixCommutedOpIndices(unsigned &ResultIdx1,
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unsigned &ResultIdx2,
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unsigned CommutableOpIdx1,
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unsigned CommutableOpIdx2) {
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if (ResultIdx1 == CommuteAnyOperandIndex &&
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ResultIdx2 == CommuteAnyOperandIndex) {
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ResultIdx1 = CommutableOpIdx1;
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ResultIdx2 = CommutableOpIdx2;
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} else if (ResultIdx1 == CommuteAnyOperandIndex) {
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if (ResultIdx2 == CommutableOpIdx1)
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ResultIdx1 = CommutableOpIdx2;
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else if (ResultIdx2 == CommutableOpIdx2)
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ResultIdx1 = CommutableOpIdx1;
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else
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return false;
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} else if (ResultIdx2 == CommuteAnyOperandIndex) {
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if (ResultIdx1 == CommutableOpIdx1)
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ResultIdx2 = CommutableOpIdx2;
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else if (ResultIdx1 == CommutableOpIdx2)
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ResultIdx2 = CommutableOpIdx1;
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else
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return false;
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} else
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// Check that the result operand indices match the given commutable
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// operand indices.
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return (ResultIdx1 == CommutableOpIdx1 && ResultIdx2 == CommutableOpIdx2) ||
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(ResultIdx1 == CommutableOpIdx2 && ResultIdx2 == CommutableOpIdx1);
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return true;
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}
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bool TargetInstrInfo::findCommutedOpIndices(MachineInstr *MI,
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unsigned &SrcOpIdx1,
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unsigned &SrcOpIdx2) const {
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assert(!MI->isBundle() &&
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"TargetInstrInfo::findCommutedOpIndices() can't handle bundles");
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const MCInstrDesc &MCID = MI->getDesc();
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if (!MCID.isCommutable())
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return false;
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// This assumes v0 = op v1, v2 and commuting would swap v1 and v2. If this
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// is not true, then the target must implement this.
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unsigned CommutableOpIdx1 = MCID.getNumDefs();
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unsigned CommutableOpIdx2 = CommutableOpIdx1 + 1;
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if (!fixCommutedOpIndices(SrcOpIdx1, SrcOpIdx2,
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CommutableOpIdx1, CommutableOpIdx2))
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return false;
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if (!MI->getOperand(SrcOpIdx1).isReg() ||
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!MI->getOperand(SrcOpIdx2).isReg())
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// No idea.
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return false;
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return true;
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}
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bool
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TargetInstrInfo::isUnpredicatedTerminator(const MachineInstr *MI) const {
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if (!MI->isTerminator()) return false;
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// Conditional branch is a special case.
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if (MI->isBranch() && !MI->isBarrier())
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return true;
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if (!MI->isPredicable())
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return true;
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return !isPredicated(MI);
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}
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bool TargetInstrInfo::PredicateInstruction(
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MachineInstr *MI, ArrayRef<MachineOperand> Pred) const {
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bool MadeChange = false;
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assert(!MI->isBundle() &&
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"TargetInstrInfo::PredicateInstruction() can't handle bundles");
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const MCInstrDesc &MCID = MI->getDesc();
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if (!MI->isPredicable())
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return false;
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for (unsigned j = 0, i = 0, e = MI->getNumOperands(); i != e; ++i) {
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if (MCID.OpInfo[i].isPredicate()) {
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MachineOperand &MO = MI->getOperand(i);
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if (MO.isReg()) {
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MO.setReg(Pred[j].getReg());
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MadeChange = true;
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} else if (MO.isImm()) {
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MO.setImm(Pred[j].getImm());
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MadeChange = true;
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} else if (MO.isMBB()) {
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MO.setMBB(Pred[j].getMBB());
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MadeChange = true;
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}
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++j;
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}
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}
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return MadeChange;
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}
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bool TargetInstrInfo::hasLoadFromStackSlot(const MachineInstr *MI,
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const MachineMemOperand *&MMO,
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int &FrameIndex) const {
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for (MachineInstr::mmo_iterator o = MI->memoperands_begin(),
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oe = MI->memoperands_end();
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o != oe;
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++o) {
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if ((*o)->isLoad()) {
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if (const FixedStackPseudoSourceValue *Value =
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dyn_cast_or_null<FixedStackPseudoSourceValue>(
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(*o)->getPseudoValue())) {
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FrameIndex = Value->getFrameIndex();
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MMO = *o;
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return true;
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}
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}
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}
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return false;
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}
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bool TargetInstrInfo::hasStoreToStackSlot(const MachineInstr *MI,
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const MachineMemOperand *&MMO,
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int &FrameIndex) const {
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for (MachineInstr::mmo_iterator o = MI->memoperands_begin(),
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oe = MI->memoperands_end();
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o != oe;
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++o) {
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if ((*o)->isStore()) {
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if (const FixedStackPseudoSourceValue *Value =
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dyn_cast_or_null<FixedStackPseudoSourceValue>(
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(*o)->getPseudoValue())) {
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FrameIndex = Value->getFrameIndex();
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MMO = *o;
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return true;
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}
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}
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}
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return false;
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}
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bool TargetInstrInfo::getStackSlotRange(const TargetRegisterClass *RC,
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unsigned SubIdx, unsigned &Size,
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unsigned &Offset,
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const MachineFunction &MF) const {
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if (!SubIdx) {
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Size = RC->getSize();
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Offset = 0;
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return true;
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}
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const TargetRegisterInfo *TRI = MF.getSubtarget().getRegisterInfo();
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unsigned BitSize = TRI->getSubRegIdxSize(SubIdx);
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// Convert bit size to byte size to be consistent with
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// MCRegisterClass::getSize().
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if (BitSize % 8)
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return false;
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int BitOffset = TRI->getSubRegIdxOffset(SubIdx);
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if (BitOffset < 0 || BitOffset % 8)
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return false;
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Size = BitSize /= 8;
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Offset = (unsigned)BitOffset / 8;
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assert(RC->getSize() >= (Offset + Size) && "bad subregister range");
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if (!MF.getDataLayout().isLittleEndian()) {
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Offset = RC->getSize() - (Offset + Size);
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}
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return true;
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}
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void TargetInstrInfo::reMaterialize(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator I,
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unsigned DestReg,
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unsigned SubIdx,
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const MachineInstr *Orig,
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const TargetRegisterInfo &TRI) const {
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MachineInstr *MI = MBB.getParent()->CloneMachineInstr(Orig);
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MI->substituteRegister(MI->getOperand(0).getReg(), DestReg, SubIdx, TRI);
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MBB.insert(I, MI);
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}
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bool
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TargetInstrInfo::produceSameValue(const MachineInstr *MI0,
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const MachineInstr *MI1,
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const MachineRegisterInfo *MRI) const {
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return MI0->isIdenticalTo(MI1, MachineInstr::IgnoreVRegDefs);
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}
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MachineInstr *TargetInstrInfo::duplicate(MachineInstr *Orig,
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MachineFunction &MF) const {
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assert(!Orig->isNotDuplicable() &&
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"Instruction cannot be duplicated");
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return MF.CloneMachineInstr(Orig);
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}
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// If the COPY instruction in MI can be folded to a stack operation, return
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// the register class to use.
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static const TargetRegisterClass *canFoldCopy(const MachineInstr *MI,
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unsigned FoldIdx) {
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assert(MI->isCopy() && "MI must be a COPY instruction");
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if (MI->getNumOperands() != 2)
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return nullptr;
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assert(FoldIdx<2 && "FoldIdx refers no nonexistent operand");
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const MachineOperand &FoldOp = MI->getOperand(FoldIdx);
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const MachineOperand &LiveOp = MI->getOperand(1-FoldIdx);
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if (FoldOp.getSubReg() || LiveOp.getSubReg())
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return nullptr;
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unsigned FoldReg = FoldOp.getReg();
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unsigned LiveReg = LiveOp.getReg();
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assert(TargetRegisterInfo::isVirtualRegister(FoldReg) &&
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"Cannot fold physregs");
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const MachineRegisterInfo &MRI = MI->getParent()->getParent()->getRegInfo();
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const TargetRegisterClass *RC = MRI.getRegClass(FoldReg);
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if (TargetRegisterInfo::isPhysicalRegister(LiveOp.getReg()))
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return RC->contains(LiveOp.getReg()) ? RC : nullptr;
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if (RC->hasSubClassEq(MRI.getRegClass(LiveReg)))
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return RC;
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// FIXME: Allow folding when register classes are memory compatible.
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return nullptr;
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}
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void TargetInstrInfo::getNoopForMachoTarget(MCInst &NopInst) const {
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llvm_unreachable("Not a MachO target");
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}
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static MachineInstr *foldPatchpoint(MachineFunction &MF, MachineInstr *MI,
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ArrayRef<unsigned> Ops, int FrameIndex,
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const TargetInstrInfo &TII) {
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unsigned StartIdx = 0;
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switch (MI->getOpcode()) {
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case TargetOpcode::STACKMAP:
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StartIdx = 2; // Skip ID, nShadowBytes.
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break;
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case TargetOpcode::PATCHPOINT: {
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// For PatchPoint, the call args are not foldable.
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PatchPointOpers opers(MI);
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StartIdx = opers.getVarIdx();
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break;
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}
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default:
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llvm_unreachable("unexpected stackmap opcode");
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}
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// Return false if any operands requested for folding are not foldable (not
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// part of the stackmap's live values).
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for (unsigned Op : Ops) {
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if (Op < StartIdx)
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return nullptr;
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}
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MachineInstr *NewMI =
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MF.CreateMachineInstr(TII.get(MI->getOpcode()), MI->getDebugLoc(), true);
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MachineInstrBuilder MIB(MF, NewMI);
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// No need to fold return, the meta data, and function arguments
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for (unsigned i = 0; i < StartIdx; ++i)
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MIB.addOperand(MI->getOperand(i));
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for (unsigned i = StartIdx; i < MI->getNumOperands(); ++i) {
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MachineOperand &MO = MI->getOperand(i);
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if (std::find(Ops.begin(), Ops.end(), i) != Ops.end()) {
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unsigned SpillSize;
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unsigned SpillOffset;
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// Compute the spill slot size and offset.
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const TargetRegisterClass *RC =
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MF.getRegInfo().getRegClass(MO.getReg());
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bool Valid =
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TII.getStackSlotRange(RC, MO.getSubReg(), SpillSize, SpillOffset, MF);
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if (!Valid)
|
|
report_fatal_error("cannot spill patchpoint subregister operand");
|
|
MIB.addImm(StackMaps::IndirectMemRefOp);
|
|
MIB.addImm(SpillSize);
|
|
MIB.addFrameIndex(FrameIndex);
|
|
MIB.addImm(SpillOffset);
|
|
}
|
|
else
|
|
MIB.addOperand(MO);
|
|
}
|
|
return NewMI;
|
|
}
|
|
|
|
/// foldMemoryOperand - Attempt to fold a load or store of the specified stack
|
|
/// slot into the specified machine instruction for the specified operand(s).
|
|
/// If this is possible, a new instruction is returned with the specified
|
|
/// operand folded, otherwise NULL is returned. The client is responsible for
|
|
/// removing the old instruction and adding the new one in the instruction
|
|
/// stream.
|
|
MachineInstr *TargetInstrInfo::foldMemoryOperand(MachineBasicBlock::iterator MI,
|
|
ArrayRef<unsigned> Ops,
|
|
int FI) const {
|
|
unsigned Flags = 0;
|
|
for (unsigned i = 0, e = Ops.size(); i != e; ++i)
|
|
if (MI->getOperand(Ops[i]).isDef())
|
|
Flags |= MachineMemOperand::MOStore;
|
|
else
|
|
Flags |= MachineMemOperand::MOLoad;
|
|
|
|
MachineBasicBlock *MBB = MI->getParent();
|
|
assert(MBB && "foldMemoryOperand needs an inserted instruction");
|
|
MachineFunction &MF = *MBB->getParent();
|
|
|
|
MachineInstr *NewMI = nullptr;
|
|
|
|
if (MI->getOpcode() == TargetOpcode::STACKMAP ||
|
|
MI->getOpcode() == TargetOpcode::PATCHPOINT) {
|
|
// Fold stackmap/patchpoint.
|
|
NewMI = foldPatchpoint(MF, MI, Ops, FI, *this);
|
|
if (NewMI)
|
|
MBB->insert(MI, NewMI);
|
|
} else {
|
|
// Ask the target to do the actual folding.
|
|
NewMI = foldMemoryOperandImpl(MF, MI, Ops, MI, FI);
|
|
}
|
|
|
|
if (NewMI) {
|
|
NewMI->setMemRefs(MI->memoperands_begin(), MI->memoperands_end());
|
|
// Add a memory operand, foldMemoryOperandImpl doesn't do that.
|
|
assert((!(Flags & MachineMemOperand::MOStore) ||
|
|
NewMI->mayStore()) &&
|
|
"Folded a def to a non-store!");
|
|
assert((!(Flags & MachineMemOperand::MOLoad) ||
|
|
NewMI->mayLoad()) &&
|
|
"Folded a use to a non-load!");
|
|
const MachineFrameInfo &MFI = *MF.getFrameInfo();
|
|
assert(MFI.getObjectOffset(FI) != -1);
|
|
MachineMemOperand *MMO = MF.getMachineMemOperand(
|
|
MachinePointerInfo::getFixedStack(MF, FI), Flags, MFI.getObjectSize(FI),
|
|
MFI.getObjectAlignment(FI));
|
|
NewMI->addMemOperand(MF, MMO);
|
|
|
|
return NewMI;
|
|
}
|
|
|
|
// Straight COPY may fold as load/store.
|
|
if (!MI->isCopy() || Ops.size() != 1)
|
|
return nullptr;
|
|
|
|
const TargetRegisterClass *RC = canFoldCopy(MI, Ops[0]);
|
|
if (!RC)
|
|
return nullptr;
|
|
|
|
const MachineOperand &MO = MI->getOperand(1-Ops[0]);
|
|
MachineBasicBlock::iterator Pos = MI;
|
|
const TargetRegisterInfo *TRI = MF.getSubtarget().getRegisterInfo();
|
|
|
|
if (Flags == MachineMemOperand::MOStore)
|
|
storeRegToStackSlot(*MBB, Pos, MO.getReg(), MO.isKill(), FI, RC, TRI);
|
|
else
|
|
loadRegFromStackSlot(*MBB, Pos, MO.getReg(), FI, RC, TRI);
|
|
return --Pos;
|
|
}
|
|
|
|
bool TargetInstrInfo::hasReassociableOperands(
|
|
const MachineInstr &Inst, const MachineBasicBlock *MBB) const {
|
|
const MachineOperand &Op1 = Inst.getOperand(1);
|
|
const MachineOperand &Op2 = Inst.getOperand(2);
|
|
const MachineRegisterInfo &MRI = MBB->getParent()->getRegInfo();
|
|
|
|
// We need virtual register definitions for the operands that we will
|
|
// reassociate.
|
|
MachineInstr *MI1 = nullptr;
|
|
MachineInstr *MI2 = nullptr;
|
|
if (Op1.isReg() && TargetRegisterInfo::isVirtualRegister(Op1.getReg()))
|
|
MI1 = MRI.getUniqueVRegDef(Op1.getReg());
|
|
if (Op2.isReg() && TargetRegisterInfo::isVirtualRegister(Op2.getReg()))
|
|
MI2 = MRI.getUniqueVRegDef(Op2.getReg());
|
|
|
|
// And they need to be in the trace (otherwise, they won't have a depth).
|
|
return MI1 && MI2 && MI1->getParent() == MBB && MI2->getParent() == MBB;
|
|
}
|
|
|
|
bool TargetInstrInfo::hasReassociableSibling(const MachineInstr &Inst,
|
|
bool &Commuted) const {
|
|
const MachineBasicBlock *MBB = Inst.getParent();
|
|
const MachineRegisterInfo &MRI = MBB->getParent()->getRegInfo();
|
|
MachineInstr *MI1 = MRI.getUniqueVRegDef(Inst.getOperand(1).getReg());
|
|
MachineInstr *MI2 = MRI.getUniqueVRegDef(Inst.getOperand(2).getReg());
|
|
unsigned AssocOpcode = Inst.getOpcode();
|
|
|
|
// If only one operand has the same opcode and it's the second source operand,
|
|
// the operands must be commuted.
|
|
Commuted = MI1->getOpcode() != AssocOpcode && MI2->getOpcode() == AssocOpcode;
|
|
if (Commuted)
|
|
std::swap(MI1, MI2);
|
|
|
|
// 1. The previous instruction must be the same type as Inst.
|
|
// 2. The previous instruction must have virtual register definitions for its
|
|
// operands in the same basic block as Inst.
|
|
// 3. The previous instruction's result must only be used by Inst.
|
|
return MI1->getOpcode() == AssocOpcode &&
|
|
hasReassociableOperands(*MI1, MBB) &&
|
|
MRI.hasOneNonDBGUse(MI1->getOperand(0).getReg());
|
|
}
|
|
|
|
// 1. The operation must be associative and commutative.
|
|
// 2. The instruction must have virtual register definitions for its
|
|
// operands in the same basic block.
|
|
// 3. The instruction must have a reassociable sibling.
|
|
bool TargetInstrInfo::isReassociationCandidate(const MachineInstr &Inst,
|
|
bool &Commuted) const {
|
|
return isAssociativeAndCommutative(Inst) &&
|
|
hasReassociableOperands(Inst, Inst.getParent()) &&
|
|
hasReassociableSibling(Inst, Commuted);
|
|
}
|
|
|
|
// The concept of the reassociation pass is that these operations can benefit
|
|
// from this kind of transformation:
|
|
//
|
|
// A = ? op ?
|
|
// B = A op X (Prev)
|
|
// C = B op Y (Root)
|
|
// -->
|
|
// A = ? op ?
|
|
// B = X op Y
|
|
// C = A op B
|
|
//
|
|
// breaking the dependency between A and B, allowing them to be executed in
|
|
// parallel (or back-to-back in a pipeline) instead of depending on each other.
|
|
|
|
// FIXME: This has the potential to be expensive (compile time) while not
|
|
// improving the code at all. Some ways to limit the overhead:
|
|
// 1. Track successful transforms; bail out if hit rate gets too low.
|
|
// 2. Only enable at -O3 or some other non-default optimization level.
|
|
// 3. Pre-screen pattern candidates here: if an operand of the previous
|
|
// instruction is known to not increase the critical path, then don't match
|
|
// that pattern.
|
|
bool TargetInstrInfo::getMachineCombinerPatterns(
|
|
MachineInstr &Root,
|
|
SmallVectorImpl<MachineCombinerPattern> &Patterns) const {
|
|
|
|
bool Commute;
|
|
if (isReassociationCandidate(Root, Commute)) {
|
|
// We found a sequence of instructions that may be suitable for a
|
|
// reassociation of operands to increase ILP. Specify each commutation
|
|
// possibility for the Prev instruction in the sequence and let the
|
|
// machine combiner decide if changing the operands is worthwhile.
|
|
if (Commute) {
|
|
Patterns.push_back(MachineCombinerPattern::REASSOC_AX_YB);
|
|
Patterns.push_back(MachineCombinerPattern::REASSOC_XA_YB);
|
|
} else {
|
|
Patterns.push_back(MachineCombinerPattern::REASSOC_AX_BY);
|
|
Patterns.push_back(MachineCombinerPattern::REASSOC_XA_BY);
|
|
}
|
|
return true;
|
|
}
|
|
|
|
return false;
|
|
}
|
|
|
|
/// Attempt the reassociation transformation to reduce critical path length.
|
|
/// See the above comments before getMachineCombinerPatterns().
|
|
void TargetInstrInfo::reassociateOps(
|
|
MachineInstr &Root, MachineInstr &Prev,
|
|
MachineCombinerPattern Pattern,
|
|
SmallVectorImpl<MachineInstr *> &InsInstrs,
|
|
SmallVectorImpl<MachineInstr *> &DelInstrs,
|
|
DenseMap<unsigned, unsigned> &InstrIdxForVirtReg) const {
|
|
MachineFunction *MF = Root.getParent()->getParent();
|
|
MachineRegisterInfo &MRI = MF->getRegInfo();
|
|
const TargetInstrInfo *TII = MF->getSubtarget().getInstrInfo();
|
|
const TargetRegisterInfo *TRI = MF->getSubtarget().getRegisterInfo();
|
|
const TargetRegisterClass *RC = Root.getRegClassConstraint(0, TII, TRI);
|
|
|
|
// This array encodes the operand index for each parameter because the
|
|
// operands may be commuted. Each row corresponds to a pattern value,
|
|
// and each column specifies the index of A, B, X, Y.
|
|
unsigned OpIdx[4][4] = {
|
|
{ 1, 1, 2, 2 },
|
|
{ 1, 2, 2, 1 },
|
|
{ 2, 1, 1, 2 },
|
|
{ 2, 2, 1, 1 }
|
|
};
|
|
|
|
int Row;
|
|
switch (Pattern) {
|
|
case MachineCombinerPattern::REASSOC_AX_BY: Row = 0; break;
|
|
case MachineCombinerPattern::REASSOC_AX_YB: Row = 1; break;
|
|
case MachineCombinerPattern::REASSOC_XA_BY: Row = 2; break;
|
|
case MachineCombinerPattern::REASSOC_XA_YB: Row = 3; break;
|
|
default: llvm_unreachable("unexpected MachineCombinerPattern");
|
|
}
|
|
|
|
MachineOperand &OpA = Prev.getOperand(OpIdx[Row][0]);
|
|
MachineOperand &OpB = Root.getOperand(OpIdx[Row][1]);
|
|
MachineOperand &OpX = Prev.getOperand(OpIdx[Row][2]);
|
|
MachineOperand &OpY = Root.getOperand(OpIdx[Row][3]);
|
|
MachineOperand &OpC = Root.getOperand(0);
|
|
|
|
unsigned RegA = OpA.getReg();
|
|
unsigned RegB = OpB.getReg();
|
|
unsigned RegX = OpX.getReg();
|
|
unsigned RegY = OpY.getReg();
|
|
unsigned RegC = OpC.getReg();
|
|
|
|
if (TargetRegisterInfo::isVirtualRegister(RegA))
|
|
MRI.constrainRegClass(RegA, RC);
|
|
if (TargetRegisterInfo::isVirtualRegister(RegB))
|
|
MRI.constrainRegClass(RegB, RC);
|
|
if (TargetRegisterInfo::isVirtualRegister(RegX))
|
|
MRI.constrainRegClass(RegX, RC);
|
|
if (TargetRegisterInfo::isVirtualRegister(RegY))
|
|
MRI.constrainRegClass(RegY, RC);
|
|
if (TargetRegisterInfo::isVirtualRegister(RegC))
|
|
MRI.constrainRegClass(RegC, RC);
|
|
|
|
// Create a new virtual register for the result of (X op Y) instead of
|
|
// recycling RegB because the MachineCombiner's computation of the critical
|
|
// path requires a new register definition rather than an existing one.
|
|
unsigned NewVR = MRI.createVirtualRegister(RC);
|
|
InstrIdxForVirtReg.insert(std::make_pair(NewVR, 0));
|
|
|
|
unsigned Opcode = Root.getOpcode();
|
|
bool KillA = OpA.isKill();
|
|
bool KillX = OpX.isKill();
|
|
bool KillY = OpY.isKill();
|
|
|
|
// Create new instructions for insertion.
|
|
MachineInstrBuilder MIB1 =
|
|
BuildMI(*MF, Prev.getDebugLoc(), TII->get(Opcode), NewVR)
|
|
.addReg(RegX, getKillRegState(KillX))
|
|
.addReg(RegY, getKillRegState(KillY));
|
|
MachineInstrBuilder MIB2 =
|
|
BuildMI(*MF, Root.getDebugLoc(), TII->get(Opcode), RegC)
|
|
.addReg(RegA, getKillRegState(KillA))
|
|
.addReg(NewVR, getKillRegState(true));
|
|
|
|
setSpecialOperandAttr(Root, Prev, *MIB1, *MIB2);
|
|
|
|
// Record new instructions for insertion and old instructions for deletion.
|
|
InsInstrs.push_back(MIB1);
|
|
InsInstrs.push_back(MIB2);
|
|
DelInstrs.push_back(&Prev);
|
|
DelInstrs.push_back(&Root);
|
|
}
|
|
|
|
void TargetInstrInfo::genAlternativeCodeSequence(
|
|
MachineInstr &Root, MachineCombinerPattern Pattern,
|
|
SmallVectorImpl<MachineInstr *> &InsInstrs,
|
|
SmallVectorImpl<MachineInstr *> &DelInstrs,
|
|
DenseMap<unsigned, unsigned> &InstIdxForVirtReg) const {
|
|
MachineRegisterInfo &MRI = Root.getParent()->getParent()->getRegInfo();
|
|
|
|
// Select the previous instruction in the sequence based on the input pattern.
|
|
MachineInstr *Prev = nullptr;
|
|
switch (Pattern) {
|
|
case MachineCombinerPattern::REASSOC_AX_BY:
|
|
case MachineCombinerPattern::REASSOC_XA_BY:
|
|
Prev = MRI.getUniqueVRegDef(Root.getOperand(1).getReg());
|
|
break;
|
|
case MachineCombinerPattern::REASSOC_AX_YB:
|
|
case MachineCombinerPattern::REASSOC_XA_YB:
|
|
Prev = MRI.getUniqueVRegDef(Root.getOperand(2).getReg());
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
assert(Prev && "Unknown pattern for machine combiner");
|
|
|
|
reassociateOps(Root, *Prev, Pattern, InsInstrs, DelInstrs, InstIdxForVirtReg);
|
|
return;
|
|
}
|
|
|
|
/// foldMemoryOperand - Same as the previous version except it allows folding
|
|
/// of any load and store from / to any address, not just from a specific
|
|
/// stack slot.
|
|
MachineInstr *TargetInstrInfo::foldMemoryOperand(MachineBasicBlock::iterator MI,
|
|
ArrayRef<unsigned> Ops,
|
|
MachineInstr *LoadMI) const {
|
|
assert(LoadMI->canFoldAsLoad() && "LoadMI isn't foldable!");
|
|
#ifndef NDEBUG
|
|
for (unsigned i = 0, e = Ops.size(); i != e; ++i)
|
|
assert(MI->getOperand(Ops[i]).isUse() && "Folding load into def!");
|
|
#endif
|
|
MachineBasicBlock &MBB = *MI->getParent();
|
|
MachineFunction &MF = *MBB.getParent();
|
|
|
|
// Ask the target to do the actual folding.
|
|
MachineInstr *NewMI = nullptr;
|
|
int FrameIndex = 0;
|
|
|
|
if ((MI->getOpcode() == TargetOpcode::STACKMAP ||
|
|
MI->getOpcode() == TargetOpcode::PATCHPOINT) &&
|
|
isLoadFromStackSlot(LoadMI, FrameIndex)) {
|
|
// Fold stackmap/patchpoint.
|
|
NewMI = foldPatchpoint(MF, MI, Ops, FrameIndex, *this);
|
|
if (NewMI)
|
|
NewMI = MBB.insert(MI, NewMI);
|
|
} else {
|
|
// Ask the target to do the actual folding.
|
|
NewMI = foldMemoryOperandImpl(MF, MI, Ops, MI, LoadMI);
|
|
}
|
|
|
|
if (!NewMI) return nullptr;
|
|
|
|
// Copy the memoperands from the load to the folded instruction.
|
|
if (MI->memoperands_empty()) {
|
|
NewMI->setMemRefs(LoadMI->memoperands_begin(),
|
|
LoadMI->memoperands_end());
|
|
}
|
|
else {
|
|
// Handle the rare case of folding multiple loads.
|
|
NewMI->setMemRefs(MI->memoperands_begin(),
|
|
MI->memoperands_end());
|
|
for (MachineInstr::mmo_iterator I = LoadMI->memoperands_begin(),
|
|
E = LoadMI->memoperands_end(); I != E; ++I) {
|
|
NewMI->addMemOperand(MF, *I);
|
|
}
|
|
}
|
|
return NewMI;
|
|
}
|
|
|
|
bool TargetInstrInfo::
|
|
isReallyTriviallyReMaterializableGeneric(const MachineInstr *MI,
|
|
AliasAnalysis *AA) const {
|
|
const MachineFunction &MF = *MI->getParent()->getParent();
|
|
const MachineRegisterInfo &MRI = MF.getRegInfo();
|
|
|
|
// Remat clients assume operand 0 is the defined register.
|
|
if (!MI->getNumOperands() || !MI->getOperand(0).isReg())
|
|
return false;
|
|
unsigned DefReg = MI->getOperand(0).getReg();
|
|
|
|
// A sub-register definition can only be rematerialized if the instruction
|
|
// doesn't read the other parts of the register. Otherwise it is really a
|
|
// read-modify-write operation on the full virtual register which cannot be
|
|
// moved safely.
|
|
if (TargetRegisterInfo::isVirtualRegister(DefReg) &&
|
|
MI->getOperand(0).getSubReg() && MI->readsVirtualRegister(DefReg))
|
|
return false;
|
|
|
|
// A load from a fixed stack slot can be rematerialized. This may be
|
|
// redundant with subsequent checks, but it's target-independent,
|
|
// simple, and a common case.
|
|
int FrameIdx = 0;
|
|
if (isLoadFromStackSlot(MI, FrameIdx) &&
|
|
MF.getFrameInfo()->isImmutableObjectIndex(FrameIdx))
|
|
return true;
|
|
|
|
// Avoid instructions obviously unsafe for remat.
|
|
if (MI->isNotDuplicable() || MI->mayStore() ||
|
|
MI->hasUnmodeledSideEffects())
|
|
return false;
|
|
|
|
// Don't remat inline asm. We have no idea how expensive it is
|
|
// even if it's side effect free.
|
|
if (MI->isInlineAsm())
|
|
return false;
|
|
|
|
// Avoid instructions which load from potentially varying memory.
|
|
if (MI->mayLoad() && !MI->isInvariantLoad(AA))
|
|
return false;
|
|
|
|
// If any of the registers accessed are non-constant, conservatively assume
|
|
// the instruction is not rematerializable.
|
|
for (unsigned i = 0, e = MI->getNumOperands(); i != e; ++i) {
|
|
const MachineOperand &MO = MI->getOperand(i);
|
|
if (!MO.isReg()) continue;
|
|
unsigned Reg = MO.getReg();
|
|
if (Reg == 0)
|
|
continue;
|
|
|
|
// Check for a well-behaved physical register.
|
|
if (TargetRegisterInfo::isPhysicalRegister(Reg)) {
|
|
if (MO.isUse()) {
|
|
// If the physreg has no defs anywhere, it's just an ambient register
|
|
// and we can freely move its uses. Alternatively, if it's allocatable,
|
|
// it could get allocated to something with a def during allocation.
|
|
if (!MRI.isConstantPhysReg(Reg, MF))
|
|
return false;
|
|
} else {
|
|
// A physreg def. We can't remat it.
|
|
return false;
|
|
}
|
|
continue;
|
|
}
|
|
|
|
// Only allow one virtual-register def. There may be multiple defs of the
|
|
// same virtual register, though.
|
|
if (MO.isDef() && Reg != DefReg)
|
|
return false;
|
|
|
|
// Don't allow any virtual-register uses. Rematting an instruction with
|
|
// virtual register uses would length the live ranges of the uses, which
|
|
// is not necessarily a good idea, certainly not "trivial".
|
|
if (MO.isUse())
|
|
return false;
|
|
}
|
|
|
|
// Everything checked out.
|
|
return true;
|
|
}
|
|
|
|
int TargetInstrInfo::getSPAdjust(const MachineInstr *MI) const {
|
|
const MachineFunction *MF = MI->getParent()->getParent();
|
|
const TargetFrameLowering *TFI = MF->getSubtarget().getFrameLowering();
|
|
bool StackGrowsDown =
|
|
TFI->getStackGrowthDirection() == TargetFrameLowering::StackGrowsDown;
|
|
|
|
unsigned FrameSetupOpcode = getCallFrameSetupOpcode();
|
|
unsigned FrameDestroyOpcode = getCallFrameDestroyOpcode();
|
|
|
|
if (MI->getOpcode() != FrameSetupOpcode &&
|
|
MI->getOpcode() != FrameDestroyOpcode)
|
|
return 0;
|
|
|
|
int SPAdj = MI->getOperand(0).getImm();
|
|
SPAdj = TFI->alignSPAdjust(SPAdj);
|
|
|
|
if ((!StackGrowsDown && MI->getOpcode() == FrameSetupOpcode) ||
|
|
(StackGrowsDown && MI->getOpcode() == FrameDestroyOpcode))
|
|
SPAdj = -SPAdj;
|
|
|
|
return SPAdj;
|
|
}
|
|
|
|
/// isSchedulingBoundary - Test if the given instruction should be
|
|
/// considered a scheduling boundary. This primarily includes labels
|
|
/// and terminators.
|
|
bool TargetInstrInfo::isSchedulingBoundary(const MachineInstr *MI,
|
|
const MachineBasicBlock *MBB,
|
|
const MachineFunction &MF) const {
|
|
// Terminators and labels can't be scheduled around.
|
|
if (MI->isTerminator() || MI->isPosition())
|
|
return true;
|
|
|
|
// Don't attempt to schedule around any instruction that defines
|
|
// a stack-oriented pointer, as it's unlikely to be profitable. This
|
|
// saves compile time, because it doesn't require every single
|
|
// stack slot reference to depend on the instruction that does the
|
|
// modification.
|
|
const TargetLowering &TLI = *MF.getSubtarget().getTargetLowering();
|
|
const TargetRegisterInfo *TRI = MF.getSubtarget().getRegisterInfo();
|
|
return MI->modifiesRegister(TLI.getStackPointerRegisterToSaveRestore(), TRI);
|
|
}
|
|
|
|
// Provide a global flag for disabling the PreRA hazard recognizer that targets
|
|
// may choose to honor.
|
|
bool TargetInstrInfo::usePreRAHazardRecognizer() const {
|
|
return !DisableHazardRecognizer;
|
|
}
|
|
|
|
// Default implementation of CreateTargetRAHazardRecognizer.
|
|
ScheduleHazardRecognizer *TargetInstrInfo::
|
|
CreateTargetHazardRecognizer(const TargetSubtargetInfo *STI,
|
|
const ScheduleDAG *DAG) const {
|
|
// Dummy hazard recognizer allows all instructions to issue.
|
|
return new ScheduleHazardRecognizer();
|
|
}
|
|
|
|
// Default implementation of CreateTargetMIHazardRecognizer.
|
|
ScheduleHazardRecognizer *TargetInstrInfo::
|
|
CreateTargetMIHazardRecognizer(const InstrItineraryData *II,
|
|
const ScheduleDAG *DAG) const {
|
|
return (ScheduleHazardRecognizer *)
|
|
new ScoreboardHazardRecognizer(II, DAG, "misched");
|
|
}
|
|
|
|
// Default implementation of CreateTargetPostRAHazardRecognizer.
|
|
ScheduleHazardRecognizer *TargetInstrInfo::
|
|
CreateTargetPostRAHazardRecognizer(const InstrItineraryData *II,
|
|
const ScheduleDAG *DAG) const {
|
|
return (ScheduleHazardRecognizer *)
|
|
new ScoreboardHazardRecognizer(II, DAG, "post-RA-sched");
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// SelectionDAG latency interface.
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
int
|
|
TargetInstrInfo::getOperandLatency(const InstrItineraryData *ItinData,
|
|
SDNode *DefNode, unsigned DefIdx,
|
|
SDNode *UseNode, unsigned UseIdx) const {
|
|
if (!ItinData || ItinData->isEmpty())
|
|
return -1;
|
|
|
|
if (!DefNode->isMachineOpcode())
|
|
return -1;
|
|
|
|
unsigned DefClass = get(DefNode->getMachineOpcode()).getSchedClass();
|
|
if (!UseNode->isMachineOpcode())
|
|
return ItinData->getOperandCycle(DefClass, DefIdx);
|
|
unsigned UseClass = get(UseNode->getMachineOpcode()).getSchedClass();
|
|
return ItinData->getOperandLatency(DefClass, DefIdx, UseClass, UseIdx);
|
|
}
|
|
|
|
int TargetInstrInfo::getInstrLatency(const InstrItineraryData *ItinData,
|
|
SDNode *N) const {
|
|
if (!ItinData || ItinData->isEmpty())
|
|
return 1;
|
|
|
|
if (!N->isMachineOpcode())
|
|
return 1;
|
|
|
|
return ItinData->getStageLatency(get(N->getMachineOpcode()).getSchedClass());
|
|
}
|
|
|
|
//===----------------------------------------------------------------------===//
|
|
// MachineInstr latency interface.
|
|
//===----------------------------------------------------------------------===//
|
|
|
|
unsigned
|
|
TargetInstrInfo::getNumMicroOps(const InstrItineraryData *ItinData,
|
|
const MachineInstr *MI) const {
|
|
if (!ItinData || ItinData->isEmpty())
|
|
return 1;
|
|
|
|
unsigned Class = MI->getDesc().getSchedClass();
|
|
int UOps = ItinData->Itineraries[Class].NumMicroOps;
|
|
if (UOps >= 0)
|
|
return UOps;
|
|
|
|
// The # of u-ops is dynamically determined. The specific target should
|
|
// override this function to return the right number.
|
|
return 1;
|
|
}
|
|
|
|
/// Return the default expected latency for a def based on it's opcode.
|
|
unsigned TargetInstrInfo::defaultDefLatency(const MCSchedModel &SchedModel,
|
|
const MachineInstr *DefMI) const {
|
|
if (DefMI->isTransient())
|
|
return 0;
|
|
if (DefMI->mayLoad())
|
|
return SchedModel.LoadLatency;
|
|
if (isHighLatencyDef(DefMI->getOpcode()))
|
|
return SchedModel.HighLatency;
|
|
return 1;
|
|
}
|
|
|
|
unsigned TargetInstrInfo::getPredicationCost(const MachineInstr *) const {
|
|
return 0;
|
|
}
|
|
|
|
unsigned TargetInstrInfo::
|
|
getInstrLatency(const InstrItineraryData *ItinData,
|
|
const MachineInstr *MI,
|
|
unsigned *PredCost) const {
|
|
// Default to one cycle for no itinerary. However, an "empty" itinerary may
|
|
// still have a MinLatency property, which getStageLatency checks.
|
|
if (!ItinData)
|
|
return MI->mayLoad() ? 2 : 1;
|
|
|
|
return ItinData->getStageLatency(MI->getDesc().getSchedClass());
|
|
}
|
|
|
|
bool TargetInstrInfo::hasLowDefLatency(const TargetSchedModel &SchedModel,
|
|
const MachineInstr *DefMI,
|
|
unsigned DefIdx) const {
|
|
const InstrItineraryData *ItinData = SchedModel.getInstrItineraries();
|
|
if (!ItinData || ItinData->isEmpty())
|
|
return false;
|
|
|
|
unsigned DefClass = DefMI->getDesc().getSchedClass();
|
|
int DefCycle = ItinData->getOperandCycle(DefClass, DefIdx);
|
|
return (DefCycle != -1 && DefCycle <= 1);
|
|
}
|
|
|
|
/// Both DefMI and UseMI must be valid. By default, call directly to the
|
|
/// itinerary. This may be overriden by the target.
|
|
int TargetInstrInfo::
|
|
getOperandLatency(const InstrItineraryData *ItinData,
|
|
const MachineInstr *DefMI, unsigned DefIdx,
|
|
const MachineInstr *UseMI, unsigned UseIdx) const {
|
|
unsigned DefClass = DefMI->getDesc().getSchedClass();
|
|
unsigned UseClass = UseMI->getDesc().getSchedClass();
|
|
return ItinData->getOperandLatency(DefClass, DefIdx, UseClass, UseIdx);
|
|
}
|
|
|
|
/// If we can determine the operand latency from the def only, without itinerary
|
|
/// lookup, do so. Otherwise return -1.
|
|
int TargetInstrInfo::computeDefOperandLatency(
|
|
const InstrItineraryData *ItinData,
|
|
const MachineInstr *DefMI) const {
|
|
|
|
// Let the target hook getInstrLatency handle missing itineraries.
|
|
if (!ItinData)
|
|
return getInstrLatency(ItinData, DefMI);
|
|
|
|
if(ItinData->isEmpty())
|
|
return defaultDefLatency(ItinData->SchedModel, DefMI);
|
|
|
|
// ...operand lookup required
|
|
return -1;
|
|
}
|
|
|
|
/// computeOperandLatency - Compute and return the latency of the given data
|
|
/// dependent def and use when the operand indices are already known. UseMI may
|
|
/// be NULL for an unknown use.
|
|
///
|
|
/// FindMin may be set to get the minimum vs. expected latency. Minimum
|
|
/// latency is used for scheduling groups, while expected latency is for
|
|
/// instruction cost and critical path.
|
|
///
|
|
/// Depending on the subtarget's itinerary properties, this may or may not need
|
|
/// to call getOperandLatency(). For most subtargets, we don't need DefIdx or
|
|
/// UseIdx to compute min latency.
|
|
unsigned TargetInstrInfo::
|
|
computeOperandLatency(const InstrItineraryData *ItinData,
|
|
const MachineInstr *DefMI, unsigned DefIdx,
|
|
const MachineInstr *UseMI, unsigned UseIdx) const {
|
|
|
|
int DefLatency = computeDefOperandLatency(ItinData, DefMI);
|
|
if (DefLatency >= 0)
|
|
return DefLatency;
|
|
|
|
assert(ItinData && !ItinData->isEmpty() && "computeDefOperandLatency fail");
|
|
|
|
int OperLatency = 0;
|
|
if (UseMI)
|
|
OperLatency = getOperandLatency(ItinData, DefMI, DefIdx, UseMI, UseIdx);
|
|
else {
|
|
unsigned DefClass = DefMI->getDesc().getSchedClass();
|
|
OperLatency = ItinData->getOperandCycle(DefClass, DefIdx);
|
|
}
|
|
if (OperLatency >= 0)
|
|
return OperLatency;
|
|
|
|
// No operand latency was found.
|
|
unsigned InstrLatency = getInstrLatency(ItinData, DefMI);
|
|
|
|
// Expected latency is the max of the stage latency and itinerary props.
|
|
InstrLatency = std::max(InstrLatency,
|
|
defaultDefLatency(ItinData->SchedModel, DefMI));
|
|
return InstrLatency;
|
|
}
|
|
|
|
bool TargetInstrInfo::getRegSequenceInputs(
|
|
const MachineInstr &MI, unsigned DefIdx,
|
|
SmallVectorImpl<RegSubRegPairAndIdx> &InputRegs) const {
|
|
assert((MI.isRegSequence() ||
|
|
MI.isRegSequenceLike()) && "Instruction do not have the proper type");
|
|
|
|
if (!MI.isRegSequence())
|
|
return getRegSequenceLikeInputs(MI, DefIdx, InputRegs);
|
|
|
|
// We are looking at:
|
|
// Def = REG_SEQUENCE v0, sub0, v1, sub1, ...
|
|
assert(DefIdx == 0 && "REG_SEQUENCE only has one def");
|
|
for (unsigned OpIdx = 1, EndOpIdx = MI.getNumOperands(); OpIdx != EndOpIdx;
|
|
OpIdx += 2) {
|
|
const MachineOperand &MOReg = MI.getOperand(OpIdx);
|
|
const MachineOperand &MOSubIdx = MI.getOperand(OpIdx + 1);
|
|
assert(MOSubIdx.isImm() &&
|
|
"One of the subindex of the reg_sequence is not an immediate");
|
|
// Record Reg:SubReg, SubIdx.
|
|
InputRegs.push_back(RegSubRegPairAndIdx(MOReg.getReg(), MOReg.getSubReg(),
|
|
(unsigned)MOSubIdx.getImm()));
|
|
}
|
|
return true;
|
|
}
|
|
|
|
bool TargetInstrInfo::getExtractSubregInputs(
|
|
const MachineInstr &MI, unsigned DefIdx,
|
|
RegSubRegPairAndIdx &InputReg) const {
|
|
assert((MI.isExtractSubreg() ||
|
|
MI.isExtractSubregLike()) && "Instruction do not have the proper type");
|
|
|
|
if (!MI.isExtractSubreg())
|
|
return getExtractSubregLikeInputs(MI, DefIdx, InputReg);
|
|
|
|
// We are looking at:
|
|
// Def = EXTRACT_SUBREG v0.sub1, sub0.
|
|
assert(DefIdx == 0 && "EXTRACT_SUBREG only has one def");
|
|
const MachineOperand &MOReg = MI.getOperand(1);
|
|
const MachineOperand &MOSubIdx = MI.getOperand(2);
|
|
assert(MOSubIdx.isImm() &&
|
|
"The subindex of the extract_subreg is not an immediate");
|
|
|
|
InputReg.Reg = MOReg.getReg();
|
|
InputReg.SubReg = MOReg.getSubReg();
|
|
InputReg.SubIdx = (unsigned)MOSubIdx.getImm();
|
|
return true;
|
|
}
|
|
|
|
bool TargetInstrInfo::getInsertSubregInputs(
|
|
const MachineInstr &MI, unsigned DefIdx,
|
|
RegSubRegPair &BaseReg, RegSubRegPairAndIdx &InsertedReg) const {
|
|
assert((MI.isInsertSubreg() ||
|
|
MI.isInsertSubregLike()) && "Instruction do not have the proper type");
|
|
|
|
if (!MI.isInsertSubreg())
|
|
return getInsertSubregLikeInputs(MI, DefIdx, BaseReg, InsertedReg);
|
|
|
|
// We are looking at:
|
|
// Def = INSERT_SEQUENCE v0, v1, sub0.
|
|
assert(DefIdx == 0 && "INSERT_SUBREG only has one def");
|
|
const MachineOperand &MOBaseReg = MI.getOperand(1);
|
|
const MachineOperand &MOInsertedReg = MI.getOperand(2);
|
|
const MachineOperand &MOSubIdx = MI.getOperand(3);
|
|
assert(MOSubIdx.isImm() &&
|
|
"One of the subindex of the reg_sequence is not an immediate");
|
|
BaseReg.Reg = MOBaseReg.getReg();
|
|
BaseReg.SubReg = MOBaseReg.getSubReg();
|
|
|
|
InsertedReg.Reg = MOInsertedReg.getReg();
|
|
InsertedReg.SubReg = MOInsertedReg.getSubReg();
|
|
InsertedReg.SubIdx = (unsigned)MOSubIdx.getImm();
|
|
return true;
|
|
}
|