mirror of
https://github.com/c64scene-ar/llvm-6502.git
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06a26637da
functional change yet. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@97855 91177308-0d34-0410-b5e6-96231b3b80d8
753 lines
30 KiB
C++
753 lines
30 KiB
C++
//==--- InstrEmitter.cpp - Emit MachineInstrs for the SelectionDAG class ---==//
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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 implements the Emit routines for the SelectionDAG class, which creates
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// MachineInstrs based on the decisions of the SelectionDAG instruction
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// selection.
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//
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//===----------------------------------------------------------------------===//
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#define DEBUG_TYPE "instr-emitter"
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#include "InstrEmitter.h"
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#include "SDDbgValue.h"
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#include "llvm/CodeGen/MachineConstantPool.h"
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#include "llvm/CodeGen/MachineFunction.h"
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#include "llvm/CodeGen/MachineInstrBuilder.h"
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#include "llvm/CodeGen/MachineRegisterInfo.h"
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#include "llvm/Target/TargetData.h"
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#include "llvm/Target/TargetMachine.h"
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#include "llvm/Target/TargetInstrInfo.h"
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#include "llvm/Target/TargetLowering.h"
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#include "llvm/ADT/Statistic.h"
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#include "llvm/Support/Debug.h"
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#include "llvm/Support/ErrorHandling.h"
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#include "llvm/Support/MathExtras.h"
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using namespace llvm;
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/// CountResults - The results of target nodes have register or immediate
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/// operands first, then an optional chain, and optional flag operands (which do
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/// not go into the resulting MachineInstr).
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unsigned InstrEmitter::CountResults(SDNode *Node) {
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unsigned N = Node->getNumValues();
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while (N && Node->getValueType(N - 1) == MVT::Flag)
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--N;
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if (N && Node->getValueType(N - 1) == MVT::Other)
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--N; // Skip over chain result.
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return N;
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}
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/// CountOperands - The inputs to target nodes have any actual inputs first,
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/// followed by an optional chain operand, then an optional flag operand.
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/// Compute the number of actual operands that will go into the resulting
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/// MachineInstr.
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unsigned InstrEmitter::CountOperands(SDNode *Node) {
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unsigned N = Node->getNumOperands();
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while (N && Node->getOperand(N - 1).getValueType() == MVT::Flag)
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--N;
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if (N && Node->getOperand(N - 1).getValueType() == MVT::Other)
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--N; // Ignore chain if it exists.
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return N;
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}
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/// EmitCopyFromReg - Generate machine code for an CopyFromReg node or an
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/// implicit physical register output.
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void InstrEmitter::
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EmitCopyFromReg(SDNode *Node, unsigned ResNo, bool IsClone, bool IsCloned,
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unsigned SrcReg, DenseMap<SDValue, unsigned> &VRBaseMap) {
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unsigned VRBase = 0;
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if (TargetRegisterInfo::isVirtualRegister(SrcReg)) {
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// Just use the input register directly!
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SDValue Op(Node, ResNo);
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if (IsClone)
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VRBaseMap.erase(Op);
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bool isNew = VRBaseMap.insert(std::make_pair(Op, SrcReg)).second;
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isNew = isNew; // Silence compiler warning.
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assert(isNew && "Node emitted out of order - early");
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return;
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}
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// If the node is only used by a CopyToReg and the dest reg is a vreg, use
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// the CopyToReg'd destination register instead of creating a new vreg.
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bool MatchReg = true;
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const TargetRegisterClass *UseRC = NULL;
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if (!IsClone && !IsCloned)
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for (SDNode::use_iterator UI = Node->use_begin(), E = Node->use_end();
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UI != E; ++UI) {
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SDNode *User = *UI;
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bool Match = true;
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if (User->getOpcode() == ISD::CopyToReg &&
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User->getOperand(2).getNode() == Node &&
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User->getOperand(2).getResNo() == ResNo) {
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unsigned DestReg = cast<RegisterSDNode>(User->getOperand(1))->getReg();
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if (TargetRegisterInfo::isVirtualRegister(DestReg)) {
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VRBase = DestReg;
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Match = false;
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} else if (DestReg != SrcReg)
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Match = false;
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} else {
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for (unsigned i = 0, e = User->getNumOperands(); i != e; ++i) {
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SDValue Op = User->getOperand(i);
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if (Op.getNode() != Node || Op.getResNo() != ResNo)
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continue;
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EVT VT = Node->getValueType(Op.getResNo());
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if (VT == MVT::Other || VT == MVT::Flag)
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continue;
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Match = false;
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if (User->isMachineOpcode()) {
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const TargetInstrDesc &II = TII->get(User->getMachineOpcode());
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const TargetRegisterClass *RC = 0;
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if (i+II.getNumDefs() < II.getNumOperands())
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RC = II.OpInfo[i+II.getNumDefs()].getRegClass(TRI);
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if (!UseRC)
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UseRC = RC;
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else if (RC) {
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const TargetRegisterClass *ComRC = getCommonSubClass(UseRC, RC);
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// If multiple uses expect disjoint register classes, we emit
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// copies in AddRegisterOperand.
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if (ComRC)
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UseRC = ComRC;
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}
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}
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}
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}
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MatchReg &= Match;
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if (VRBase)
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break;
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}
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EVT VT = Node->getValueType(ResNo);
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const TargetRegisterClass *SrcRC = 0, *DstRC = 0;
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SrcRC = TRI->getPhysicalRegisterRegClass(SrcReg, VT);
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// Figure out the register class to create for the destreg.
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if (VRBase) {
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DstRC = MRI->getRegClass(VRBase);
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} else if (UseRC) {
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assert(UseRC->hasType(VT) && "Incompatible phys register def and uses!");
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DstRC = UseRC;
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} else {
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DstRC = TLI->getRegClassFor(VT);
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}
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// If all uses are reading from the src physical register and copying the
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// register is either impossible or very expensive, then don't create a copy.
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if (MatchReg && SrcRC->getCopyCost() < 0) {
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VRBase = SrcReg;
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} else {
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// Create the reg, emit the copy.
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VRBase = MRI->createVirtualRegister(DstRC);
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bool Emitted = TII->copyRegToReg(*MBB, InsertPos, VRBase, SrcReg,
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DstRC, SrcRC);
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assert(Emitted && "Unable to issue a copy instruction!\n");
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(void) Emitted;
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}
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SDValue Op(Node, ResNo);
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if (IsClone)
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VRBaseMap.erase(Op);
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bool isNew = VRBaseMap.insert(std::make_pair(Op, VRBase)).second;
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isNew = isNew; // Silence compiler warning.
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assert(isNew && "Node emitted out of order - early");
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}
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/// getDstOfCopyToRegUse - If the only use of the specified result number of
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/// node is a CopyToReg, return its destination register. Return 0 otherwise.
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unsigned InstrEmitter::getDstOfOnlyCopyToRegUse(SDNode *Node,
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unsigned ResNo) const {
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if (!Node->hasOneUse())
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return 0;
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SDNode *User = *Node->use_begin();
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if (User->getOpcode() == ISD::CopyToReg &&
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User->getOperand(2).getNode() == Node &&
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User->getOperand(2).getResNo() == ResNo) {
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unsigned Reg = cast<RegisterSDNode>(User->getOperand(1))->getReg();
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if (TargetRegisterInfo::isVirtualRegister(Reg))
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return Reg;
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}
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return 0;
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}
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void InstrEmitter::CreateVirtualRegisters(SDNode *Node, MachineInstr *MI,
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const TargetInstrDesc &II,
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bool IsClone, bool IsCloned,
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DenseMap<SDValue, unsigned> &VRBaseMap) {
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assert(Node->getMachineOpcode() != TargetOpcode::IMPLICIT_DEF &&
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"IMPLICIT_DEF should have been handled as a special case elsewhere!");
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for (unsigned i = 0; i < II.getNumDefs(); ++i) {
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// If the specific node value is only used by a CopyToReg and the dest reg
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// is a vreg in the same register class, use the CopyToReg'd destination
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// register instead of creating a new vreg.
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unsigned VRBase = 0;
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const TargetRegisterClass *RC = II.OpInfo[i].getRegClass(TRI);
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if (II.OpInfo[i].isOptionalDef()) {
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// Optional def must be a physical register.
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unsigned NumResults = CountResults(Node);
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VRBase = cast<RegisterSDNode>(Node->getOperand(i-NumResults))->getReg();
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assert(TargetRegisterInfo::isPhysicalRegister(VRBase));
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MI->addOperand(MachineOperand::CreateReg(VRBase, true));
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}
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if (!VRBase && !IsClone && !IsCloned)
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for (SDNode::use_iterator UI = Node->use_begin(), E = Node->use_end();
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UI != E; ++UI) {
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SDNode *User = *UI;
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if (User->getOpcode() == ISD::CopyToReg &&
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User->getOperand(2).getNode() == Node &&
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User->getOperand(2).getResNo() == i) {
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unsigned Reg = cast<RegisterSDNode>(User->getOperand(1))->getReg();
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if (TargetRegisterInfo::isVirtualRegister(Reg)) {
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const TargetRegisterClass *RegRC = MRI->getRegClass(Reg);
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if (RegRC == RC) {
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VRBase = Reg;
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MI->addOperand(MachineOperand::CreateReg(Reg, true));
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break;
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}
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}
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}
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}
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// Create the result registers for this node and add the result regs to
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// the machine instruction.
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if (VRBase == 0) {
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assert(RC && "Isn't a register operand!");
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VRBase = MRI->createVirtualRegister(RC);
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MI->addOperand(MachineOperand::CreateReg(VRBase, true));
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}
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SDValue Op(Node, i);
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if (IsClone)
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VRBaseMap.erase(Op);
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bool isNew = VRBaseMap.insert(std::make_pair(Op, VRBase)).second;
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isNew = isNew; // Silence compiler warning.
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assert(isNew && "Node emitted out of order - early");
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}
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}
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/// getVR - Return the virtual register corresponding to the specified result
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/// of the specified node.
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unsigned InstrEmitter::getVR(SDValue Op,
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DenseMap<SDValue, unsigned> &VRBaseMap) {
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if (Op.isMachineOpcode() &&
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Op.getMachineOpcode() == TargetOpcode::IMPLICIT_DEF) {
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// Add an IMPLICIT_DEF instruction before every use.
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unsigned VReg = getDstOfOnlyCopyToRegUse(Op.getNode(), Op.getResNo());
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// IMPLICIT_DEF can produce any type of result so its TargetInstrDesc
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// does not include operand register class info.
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if (!VReg) {
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const TargetRegisterClass *RC = TLI->getRegClassFor(Op.getValueType());
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VReg = MRI->createVirtualRegister(RC);
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}
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BuildMI(MBB, Op.getDebugLoc(),
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TII->get(TargetOpcode::IMPLICIT_DEF), VReg);
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return VReg;
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}
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DenseMap<SDValue, unsigned>::iterator I = VRBaseMap.find(Op);
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assert(I != VRBaseMap.end() && "Node emitted out of order - late");
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return I->second;
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}
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/// AddRegisterOperand - Add the specified register as an operand to the
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/// specified machine instr. Insert register copies if the register is
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/// not in the required register class.
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void
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InstrEmitter::AddRegisterOperand(MachineInstr *MI, SDValue Op,
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unsigned IIOpNum,
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const TargetInstrDesc *II,
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DenseMap<SDValue, unsigned> &VRBaseMap) {
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assert(Op.getValueType() != MVT::Other &&
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Op.getValueType() != MVT::Flag &&
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"Chain and flag operands should occur at end of operand list!");
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// Get/emit the operand.
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unsigned VReg = getVR(Op, VRBaseMap);
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assert(TargetRegisterInfo::isVirtualRegister(VReg) && "Not a vreg?");
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const TargetInstrDesc &TID = MI->getDesc();
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bool isOptDef = IIOpNum < TID.getNumOperands() &&
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TID.OpInfo[IIOpNum].isOptionalDef();
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// If the instruction requires a register in a different class, create
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// a new virtual register and copy the value into it.
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if (II) {
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const TargetRegisterClass *SrcRC = MRI->getRegClass(VReg);
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const TargetRegisterClass *DstRC = 0;
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if (IIOpNum < II->getNumOperands())
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DstRC = II->OpInfo[IIOpNum].getRegClass(TRI);
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assert((DstRC || (TID.isVariadic() && IIOpNum >= TID.getNumOperands())) &&
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"Don't have operand info for this instruction!");
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if (DstRC && SrcRC != DstRC && !SrcRC->hasSuperClass(DstRC)) {
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unsigned NewVReg = MRI->createVirtualRegister(DstRC);
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bool Emitted = TII->copyRegToReg(*MBB, InsertPos, NewVReg, VReg,
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DstRC, SrcRC);
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assert(Emitted && "Unable to issue a copy instruction!\n");
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(void) Emitted;
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VReg = NewVReg;
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}
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}
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MI->addOperand(MachineOperand::CreateReg(VReg, isOptDef));
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}
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/// AddOperand - Add the specified operand to the specified machine instr. II
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/// specifies the instruction information for the node, and IIOpNum is the
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/// operand number (in the II) that we are adding. IIOpNum and II are used for
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/// assertions only.
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void InstrEmitter::AddOperand(MachineInstr *MI, SDValue Op,
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unsigned IIOpNum,
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const TargetInstrDesc *II,
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DenseMap<SDValue, unsigned> &VRBaseMap) {
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if (Op.isMachineOpcode()) {
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AddRegisterOperand(MI, Op, IIOpNum, II, VRBaseMap);
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} else if (ConstantSDNode *C = dyn_cast<ConstantSDNode>(Op)) {
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MI->addOperand(MachineOperand::CreateImm(C->getSExtValue()));
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} else if (ConstantFPSDNode *F = dyn_cast<ConstantFPSDNode>(Op)) {
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const ConstantFP *CFP = F->getConstantFPValue();
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MI->addOperand(MachineOperand::CreateFPImm(CFP));
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} else if (RegisterSDNode *R = dyn_cast<RegisterSDNode>(Op)) {
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MI->addOperand(MachineOperand::CreateReg(R->getReg(), false));
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} else if (GlobalAddressSDNode *TGA = dyn_cast<GlobalAddressSDNode>(Op)) {
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MI->addOperand(MachineOperand::CreateGA(TGA->getGlobal(), TGA->getOffset(),
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TGA->getTargetFlags()));
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} else if (BasicBlockSDNode *BBNode = dyn_cast<BasicBlockSDNode>(Op)) {
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MI->addOperand(MachineOperand::CreateMBB(BBNode->getBasicBlock()));
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} else if (FrameIndexSDNode *FI = dyn_cast<FrameIndexSDNode>(Op)) {
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MI->addOperand(MachineOperand::CreateFI(FI->getIndex()));
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} else if (JumpTableSDNode *JT = dyn_cast<JumpTableSDNode>(Op)) {
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MI->addOperand(MachineOperand::CreateJTI(JT->getIndex(),
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JT->getTargetFlags()));
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} else if (ConstantPoolSDNode *CP = dyn_cast<ConstantPoolSDNode>(Op)) {
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int Offset = CP->getOffset();
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unsigned Align = CP->getAlignment();
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const Type *Type = CP->getType();
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// MachineConstantPool wants an explicit alignment.
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if (Align == 0) {
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Align = TM->getTargetData()->getPrefTypeAlignment(Type);
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if (Align == 0) {
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// Alignment of vector types. FIXME!
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Align = TM->getTargetData()->getTypeAllocSize(Type);
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}
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}
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unsigned Idx;
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MachineConstantPool *MCP = MF->getConstantPool();
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if (CP->isMachineConstantPoolEntry())
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Idx = MCP->getConstantPoolIndex(CP->getMachineCPVal(), Align);
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else
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Idx = MCP->getConstantPoolIndex(CP->getConstVal(), Align);
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MI->addOperand(MachineOperand::CreateCPI(Idx, Offset,
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CP->getTargetFlags()));
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} else if (ExternalSymbolSDNode *ES = dyn_cast<ExternalSymbolSDNode>(Op)) {
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MI->addOperand(MachineOperand::CreateES(ES->getSymbol(),
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ES->getTargetFlags()));
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} else if (BlockAddressSDNode *BA = dyn_cast<BlockAddressSDNode>(Op)) {
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MI->addOperand(MachineOperand::CreateBA(BA->getBlockAddress(),
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BA->getTargetFlags()));
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} else {
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assert(Op.getValueType() != MVT::Other &&
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Op.getValueType() != MVT::Flag &&
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"Chain and flag operands should occur at end of operand list!");
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AddRegisterOperand(MI, Op, IIOpNum, II, VRBaseMap);
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}
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}
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/// getSuperRegisterRegClass - Returns the register class of a superreg A whose
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/// "SubIdx"'th sub-register class is the specified register class and whose
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/// type matches the specified type.
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static const TargetRegisterClass*
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getSuperRegisterRegClass(const TargetRegisterClass *TRC,
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unsigned SubIdx, EVT VT) {
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// Pick the register class of the superegister for this type
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for (TargetRegisterInfo::regclass_iterator I = TRC->superregclasses_begin(),
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E = TRC->superregclasses_end(); I != E; ++I)
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if ((*I)->hasType(VT) && (*I)->getSubRegisterRegClass(SubIdx) == TRC)
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return *I;
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assert(false && "Couldn't find the register class");
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return 0;
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}
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/// EmitSubregNode - Generate machine code for subreg nodes.
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///
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void InstrEmitter::EmitSubregNode(SDNode *Node,
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DenseMap<SDValue, unsigned> &VRBaseMap){
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unsigned VRBase = 0;
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unsigned Opc = Node->getMachineOpcode();
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// If the node is only used by a CopyToReg and the dest reg is a vreg, use
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// the CopyToReg'd destination register instead of creating a new vreg.
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for (SDNode::use_iterator UI = Node->use_begin(), E = Node->use_end();
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UI != E; ++UI) {
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SDNode *User = *UI;
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if (User->getOpcode() == ISD::CopyToReg &&
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User->getOperand(2).getNode() == Node) {
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unsigned DestReg = cast<RegisterSDNode>(User->getOperand(1))->getReg();
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if (TargetRegisterInfo::isVirtualRegister(DestReg)) {
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VRBase = DestReg;
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break;
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}
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}
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}
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if (Opc == TargetOpcode::EXTRACT_SUBREG) {
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unsigned SubIdx = cast<ConstantSDNode>(Node->getOperand(1))->getZExtValue();
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// Create the extract_subreg machine instruction.
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MachineInstr *MI = BuildMI(*MF, Node->getDebugLoc(),
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TII->get(TargetOpcode::EXTRACT_SUBREG));
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// Figure out the register class to create for the destreg.
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unsigned VReg = getVR(Node->getOperand(0), VRBaseMap);
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const TargetRegisterClass *TRC = MRI->getRegClass(VReg);
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const TargetRegisterClass *SRC = TRC->getSubRegisterRegClass(SubIdx);
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assert(SRC && "Invalid subregister index in EXTRACT_SUBREG");
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// Figure out the register class to create for the destreg.
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// Note that if we're going to directly use an existing register,
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// it must be precisely the required class, and not a subclass
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// thereof.
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if (VRBase == 0 || SRC != MRI->getRegClass(VRBase)) {
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// Create the reg
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assert(SRC && "Couldn't find source register class");
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VRBase = MRI->createVirtualRegister(SRC);
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}
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// Add def, source, and subreg index
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MI->addOperand(MachineOperand::CreateReg(VRBase, true));
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AddOperand(MI, Node->getOperand(0), 0, 0, VRBaseMap);
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MI->addOperand(MachineOperand::CreateImm(SubIdx));
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MBB->insert(InsertPos, MI);
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} else if (Opc == TargetOpcode::INSERT_SUBREG ||
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Opc == TargetOpcode::SUBREG_TO_REG) {
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SDValue N0 = Node->getOperand(0);
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SDValue N1 = Node->getOperand(1);
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SDValue N2 = Node->getOperand(2);
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unsigned SubReg = getVR(N1, VRBaseMap);
|
|
unsigned SubIdx = cast<ConstantSDNode>(N2)->getZExtValue();
|
|
const TargetRegisterClass *TRC = MRI->getRegClass(SubReg);
|
|
const TargetRegisterClass *SRC =
|
|
getSuperRegisterRegClass(TRC, SubIdx,
|
|
Node->getValueType(0));
|
|
|
|
// Figure out the register class to create for the destreg.
|
|
// Note that if we're going to directly use an existing register,
|
|
// it must be precisely the required class, and not a subclass
|
|
// thereof.
|
|
if (VRBase == 0 || SRC != MRI->getRegClass(VRBase)) {
|
|
// Create the reg
|
|
assert(SRC && "Couldn't find source register class");
|
|
VRBase = MRI->createVirtualRegister(SRC);
|
|
}
|
|
|
|
// Create the insert_subreg or subreg_to_reg machine instruction.
|
|
MachineInstr *MI = BuildMI(*MF, Node->getDebugLoc(), TII->get(Opc));
|
|
MI->addOperand(MachineOperand::CreateReg(VRBase, true));
|
|
|
|
// If creating a subreg_to_reg, then the first input operand
|
|
// is an implicit value immediate, otherwise it's a register
|
|
if (Opc == TargetOpcode::SUBREG_TO_REG) {
|
|
const ConstantSDNode *SD = cast<ConstantSDNode>(N0);
|
|
MI->addOperand(MachineOperand::CreateImm(SD->getZExtValue()));
|
|
} else
|
|
AddOperand(MI, N0, 0, 0, VRBaseMap);
|
|
// Add the subregster being inserted
|
|
AddOperand(MI, N1, 0, 0, VRBaseMap);
|
|
MI->addOperand(MachineOperand::CreateImm(SubIdx));
|
|
MBB->insert(InsertPos, MI);
|
|
} else
|
|
llvm_unreachable("Node is not insert_subreg, extract_subreg, or subreg_to_reg");
|
|
|
|
SDValue Op(Node, 0);
|
|
bool isNew = VRBaseMap.insert(std::make_pair(Op, VRBase)).second;
|
|
isNew = isNew; // Silence compiler warning.
|
|
assert(isNew && "Node emitted out of order - early");
|
|
}
|
|
|
|
/// EmitCopyToRegClassNode - Generate machine code for COPY_TO_REGCLASS nodes.
|
|
/// COPY_TO_REGCLASS is just a normal copy, except that the destination
|
|
/// register is constrained to be in a particular register class.
|
|
///
|
|
void
|
|
InstrEmitter::EmitCopyToRegClassNode(SDNode *Node,
|
|
DenseMap<SDValue, unsigned> &VRBaseMap) {
|
|
unsigned VReg = getVR(Node->getOperand(0), VRBaseMap);
|
|
const TargetRegisterClass *SrcRC = MRI->getRegClass(VReg);
|
|
|
|
unsigned DstRCIdx = cast<ConstantSDNode>(Node->getOperand(1))->getZExtValue();
|
|
const TargetRegisterClass *DstRC = TRI->getRegClass(DstRCIdx);
|
|
|
|
// Create the new VReg in the destination class and emit a copy.
|
|
unsigned NewVReg = MRI->createVirtualRegister(DstRC);
|
|
bool Emitted = TII->copyRegToReg(*MBB, InsertPos, NewVReg, VReg,
|
|
DstRC, SrcRC);
|
|
assert(Emitted &&
|
|
"Unable to issue a copy instruction for a COPY_TO_REGCLASS node!\n");
|
|
(void) Emitted;
|
|
|
|
SDValue Op(Node, 0);
|
|
bool isNew = VRBaseMap.insert(std::make_pair(Op, NewVReg)).second;
|
|
isNew = isNew; // Silence compiler warning.
|
|
assert(isNew && "Node emitted out of order - early");
|
|
}
|
|
|
|
/// EmitDbgValue - Generate any debug info that refers to this Node. Constant
|
|
/// dbg_value is not handled here.
|
|
void
|
|
InstrEmitter::EmitDbgValue(SDNode *Node,
|
|
DenseMap<SDValue, unsigned> &VRBaseMap,
|
|
SDDbgValue *sd) {
|
|
if (!Node->getHasDebugValue())
|
|
return;
|
|
if (!sd)
|
|
return;
|
|
unsigned VReg = getVR(SDValue(sd->getSDNode(), sd->getResNo()), VRBaseMap);
|
|
const TargetInstrDesc &II = TII->get(TargetOpcode::DBG_VALUE);
|
|
DebugLoc DL = sd->getDebugLoc();
|
|
MachineInstr *MI;
|
|
if (VReg) {
|
|
MI = BuildMI(*MF, DL, II).addReg(VReg, RegState::Debug).
|
|
addImm(sd->getOffset()).
|
|
addMetadata(sd->getMDPtr());
|
|
} else {
|
|
// Insert an Undef so we can see what we dropped.
|
|
MI = BuildMI(*MF, DL, II).addReg(0U).addImm(sd->getOffset()).
|
|
addMetadata(sd->getMDPtr());
|
|
}
|
|
MBB->insert(InsertPos, MI);
|
|
}
|
|
|
|
/// EmitDbgValue - Generate constant debug info. No SDNode is involved.
|
|
void
|
|
InstrEmitter::EmitDbgValue(SDDbgValue *sd) {
|
|
if (!sd)
|
|
return;
|
|
const TargetInstrDesc &II = TII->get(TargetOpcode::DBG_VALUE);
|
|
DebugLoc DL = sd->getDebugLoc();
|
|
MachineInstr *MI;
|
|
Value *V = sd->getConst();
|
|
if (ConstantInt *CI = dyn_cast<ConstantInt>(V)) {
|
|
MI = BuildMI(*MF, DL, II).addImm(CI->getZExtValue()).
|
|
addImm(sd->getOffset()).
|
|
addMetadata(sd->getMDPtr());
|
|
} else if (ConstantFP *CF = dyn_cast<ConstantFP>(V)) {
|
|
MI = BuildMI(*MF, DL, II).addFPImm(CF).addImm(sd->getOffset()).
|
|
addMetadata(sd->getMDPtr());
|
|
} else {
|
|
// Insert an Undef so we can see what we dropped.
|
|
MI = BuildMI(*MF, DL, II).addReg(0U).addImm(sd->getOffset()).
|
|
addMetadata(sd->getMDPtr());
|
|
}
|
|
MBB->insert(InsertPos, MI);
|
|
}
|
|
|
|
/// EmitNode - Generate machine code for a node and needed dependencies.
|
|
///
|
|
void InstrEmitter::EmitNode(SDNode *Node, bool IsClone, bool IsCloned,
|
|
DenseMap<SDValue, unsigned> &VRBaseMap,
|
|
DenseMap<MachineBasicBlock*, MachineBasicBlock*> *EM) {
|
|
// If machine instruction
|
|
if (Node->isMachineOpcode()) {
|
|
unsigned Opc = Node->getMachineOpcode();
|
|
|
|
// Handle subreg insert/extract specially
|
|
if (Opc == TargetOpcode::EXTRACT_SUBREG ||
|
|
Opc == TargetOpcode::INSERT_SUBREG ||
|
|
Opc == TargetOpcode::SUBREG_TO_REG) {
|
|
EmitSubregNode(Node, VRBaseMap);
|
|
return;
|
|
}
|
|
|
|
// Handle COPY_TO_REGCLASS specially.
|
|
if (Opc == TargetOpcode::COPY_TO_REGCLASS) {
|
|
EmitCopyToRegClassNode(Node, VRBaseMap);
|
|
return;
|
|
}
|
|
|
|
if (Opc == TargetOpcode::IMPLICIT_DEF)
|
|
// We want a unique VR for each IMPLICIT_DEF use.
|
|
return;
|
|
|
|
const TargetInstrDesc &II = TII->get(Opc);
|
|
unsigned NumResults = CountResults(Node);
|
|
unsigned NodeOperands = CountOperands(Node);
|
|
bool HasPhysRegOuts = (NumResults > II.getNumDefs()) &&
|
|
II.getImplicitDefs() != 0;
|
|
#ifndef NDEBUG
|
|
unsigned NumMIOperands = NodeOperands + NumResults;
|
|
assert((II.getNumOperands() == NumMIOperands ||
|
|
HasPhysRegOuts || II.isVariadic()) &&
|
|
"#operands for dag node doesn't match .td file!");
|
|
#endif
|
|
|
|
// Create the new machine instruction.
|
|
MachineInstr *MI = BuildMI(*MF, Node->getDebugLoc(), II);
|
|
|
|
// Add result register values for things that are defined by this
|
|
// instruction.
|
|
if (NumResults)
|
|
CreateVirtualRegisters(Node, MI, II, IsClone, IsCloned, VRBaseMap);
|
|
|
|
// Emit all of the actual operands of this instruction, adding them to the
|
|
// instruction as appropriate.
|
|
bool HasOptPRefs = II.getNumDefs() > NumResults;
|
|
assert((!HasOptPRefs || !HasPhysRegOuts) &&
|
|
"Unable to cope with optional defs and phys regs defs!");
|
|
unsigned NumSkip = HasOptPRefs ? II.getNumDefs() - NumResults : 0;
|
|
for (unsigned i = NumSkip; i != NodeOperands; ++i)
|
|
AddOperand(MI, Node->getOperand(i), i-NumSkip+II.getNumDefs(), &II,
|
|
VRBaseMap);
|
|
|
|
// Transfer all of the memory reference descriptions of this instruction.
|
|
MI->setMemRefs(cast<MachineSDNode>(Node)->memoperands_begin(),
|
|
cast<MachineSDNode>(Node)->memoperands_end());
|
|
|
|
if (II.usesCustomInsertionHook()) {
|
|
// Insert this instruction into the basic block using a target
|
|
// specific inserter which may returns a new basic block.
|
|
MBB = TLI->EmitInstrWithCustomInserter(MI, MBB, EM);
|
|
InsertPos = MBB->end();
|
|
} else {
|
|
MBB->insert(InsertPos, MI);
|
|
}
|
|
|
|
// Additional results must be an physical register def.
|
|
if (HasPhysRegOuts) {
|
|
for (unsigned i = II.getNumDefs(); i < NumResults; ++i) {
|
|
unsigned Reg = II.getImplicitDefs()[i - II.getNumDefs()];
|
|
if (Node->hasAnyUseOfValue(i))
|
|
EmitCopyFromReg(Node, i, IsClone, IsCloned, Reg, VRBaseMap);
|
|
// If there are no uses, mark the register as dead now, so that
|
|
// MachineLICM/Sink can see that it's dead. Don't do this if the
|
|
// node has a Flag value, for the benefit of targets still using
|
|
// Flag for values in physregs.
|
|
else if (Node->getValueType(Node->getNumValues()-1) != MVT::Flag)
|
|
MI->addRegisterDead(Reg, TRI);
|
|
}
|
|
}
|
|
return;
|
|
}
|
|
|
|
switch (Node->getOpcode()) {
|
|
default:
|
|
#ifndef NDEBUG
|
|
Node->dump();
|
|
#endif
|
|
llvm_unreachable("This target-independent node should have been selected!");
|
|
break;
|
|
case ISD::EntryToken:
|
|
llvm_unreachable("EntryToken should have been excluded from the schedule!");
|
|
break;
|
|
case ISD::MERGE_VALUES:
|
|
case ISD::TokenFactor: // fall thru
|
|
break;
|
|
case ISD::CopyToReg: {
|
|
unsigned SrcReg;
|
|
SDValue SrcVal = Node->getOperand(2);
|
|
if (RegisterSDNode *R = dyn_cast<RegisterSDNode>(SrcVal))
|
|
SrcReg = R->getReg();
|
|
else
|
|
SrcReg = getVR(SrcVal, VRBaseMap);
|
|
|
|
unsigned DestReg = cast<RegisterSDNode>(Node->getOperand(1))->getReg();
|
|
if (SrcReg == DestReg) // Coalesced away the copy? Ignore.
|
|
break;
|
|
|
|
const TargetRegisterClass *SrcTRC = 0, *DstTRC = 0;
|
|
// Get the register classes of the src/dst.
|
|
if (TargetRegisterInfo::isVirtualRegister(SrcReg))
|
|
SrcTRC = MRI->getRegClass(SrcReg);
|
|
else
|
|
SrcTRC = TRI->getPhysicalRegisterRegClass(SrcReg,SrcVal.getValueType());
|
|
|
|
if (TargetRegisterInfo::isVirtualRegister(DestReg))
|
|
DstTRC = MRI->getRegClass(DestReg);
|
|
else
|
|
DstTRC = TRI->getPhysicalRegisterRegClass(DestReg,
|
|
Node->getOperand(1).getValueType());
|
|
|
|
bool Emitted = TII->copyRegToReg(*MBB, InsertPos, DestReg, SrcReg,
|
|
DstTRC, SrcTRC);
|
|
assert(Emitted && "Unable to issue a copy instruction!\n");
|
|
(void) Emitted;
|
|
break;
|
|
}
|
|
case ISD::CopyFromReg: {
|
|
unsigned SrcReg = cast<RegisterSDNode>(Node->getOperand(1))->getReg();
|
|
EmitCopyFromReg(Node, 0, IsClone, IsCloned, SrcReg, VRBaseMap);
|
|
break;
|
|
}
|
|
case ISD::INLINEASM: {
|
|
unsigned NumOps = Node->getNumOperands();
|
|
if (Node->getOperand(NumOps-1).getValueType() == MVT::Flag)
|
|
--NumOps; // Ignore the flag operand.
|
|
|
|
// Create the inline asm machine instruction.
|
|
MachineInstr *MI = BuildMI(*MF, Node->getDebugLoc(),
|
|
TII->get(TargetOpcode::INLINEASM));
|
|
|
|
// Add the asm string as an external symbol operand.
|
|
const char *AsmStr =
|
|
cast<ExternalSymbolSDNode>(Node->getOperand(1))->getSymbol();
|
|
MI->addOperand(MachineOperand::CreateES(AsmStr));
|
|
|
|
// Add all of the operand registers to the instruction.
|
|
for (unsigned i = 2; i != NumOps;) {
|
|
unsigned Flags =
|
|
cast<ConstantSDNode>(Node->getOperand(i))->getZExtValue();
|
|
unsigned NumVals = InlineAsm::getNumOperandRegisters(Flags);
|
|
|
|
MI->addOperand(MachineOperand::CreateImm(Flags));
|
|
++i; // Skip the ID value.
|
|
|
|
switch (Flags & 7) {
|
|
default: llvm_unreachable("Bad flags!");
|
|
case 2: // Def of register.
|
|
for (; NumVals; --NumVals, ++i) {
|
|
unsigned Reg = cast<RegisterSDNode>(Node->getOperand(i))->getReg();
|
|
MI->addOperand(MachineOperand::CreateReg(Reg, true));
|
|
}
|
|
break;
|
|
case 6: // Def of earlyclobber register.
|
|
for (; NumVals; --NumVals, ++i) {
|
|
unsigned Reg = cast<RegisterSDNode>(Node->getOperand(i))->getReg();
|
|
MI->addOperand(MachineOperand::CreateReg(Reg, true, false, false,
|
|
false, false, true));
|
|
}
|
|
break;
|
|
case 1: // Use of register.
|
|
case 3: // Immediate.
|
|
case 4: // Addressing mode.
|
|
// The addressing mode has been selected, just add all of the
|
|
// operands to the machine instruction.
|
|
for (; NumVals; --NumVals, ++i)
|
|
AddOperand(MI, Node->getOperand(i), 0, 0, VRBaseMap);
|
|
break;
|
|
}
|
|
}
|
|
MBB->insert(InsertPos, MI);
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
|
|
/// InstrEmitter - Construct an InstrEmitter and set it to start inserting
|
|
/// at the given position in the given block.
|
|
InstrEmitter::InstrEmitter(MachineBasicBlock *mbb,
|
|
MachineBasicBlock::iterator insertpos)
|
|
: MF(mbb->getParent()),
|
|
MRI(&MF->getRegInfo()),
|
|
TM(&MF->getTarget()),
|
|
TII(TM->getInstrInfo()),
|
|
TRI(TM->getRegisterInfo()),
|
|
TLI(TM->getTargetLowering()),
|
|
MBB(mbb), InsertPos(insertpos) {
|
|
}
|