forked from OSchip/llvm-project
447 lines
15 KiB
C++
447 lines
15 KiB
C++
//===-- SparcInstrInfo.cpp - Sparc 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 contains the Sparc implementation of the TargetInstrInfo class.
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//
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//===----------------------------------------------------------------------===//
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#include "SparcInstrInfo.h"
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#include "Sparc.h"
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#include "SparcMachineFunctionInfo.h"
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#include "SparcSubtarget.h"
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#include "llvm/ADT/STLExtras.h"
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#include "llvm/ADT/SmallVector.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/Support/ErrorHandling.h"
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#include "llvm/Support/TargetRegistry.h"
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using namespace llvm;
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#define GET_INSTRINFO_CTOR_DTOR
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#include "SparcGenInstrInfo.inc"
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// Pin the vtable to this file.
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void SparcInstrInfo::anchor() {}
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SparcInstrInfo::SparcInstrInfo(SparcSubtarget &ST)
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: SparcGenInstrInfo(SP::ADJCALLSTACKDOWN, SP::ADJCALLSTACKUP),
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RI(ST), Subtarget(ST) {
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}
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/// isLoadFromStackSlot - If the specified machine instruction is a direct
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/// load from a stack slot, return the virtual or physical register number of
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/// the destination along with the FrameIndex of the loaded stack slot. If
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/// not, return 0. This predicate must return 0 if the instruction has
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/// any side effects other than loading from the stack slot.
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unsigned SparcInstrInfo::isLoadFromStackSlot(const MachineInstr *MI,
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int &FrameIndex) const {
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if (MI->getOpcode() == SP::LDri ||
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MI->getOpcode() == SP::LDXri ||
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MI->getOpcode() == SP::LDFri ||
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MI->getOpcode() == SP::LDDFri ||
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MI->getOpcode() == SP::LDQFri) {
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if (MI->getOperand(1).isFI() && MI->getOperand(2).isImm() &&
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MI->getOperand(2).getImm() == 0) {
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FrameIndex = MI->getOperand(1).getIndex();
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return MI->getOperand(0).getReg();
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}
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}
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return 0;
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}
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/// isStoreToStackSlot - If the specified machine instruction is a direct
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/// store to a stack slot, return the virtual or physical register number of
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/// the source reg along with the FrameIndex of the loaded stack slot. If
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/// not, return 0. This predicate must return 0 if the instruction has
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/// any side effects other than storing to the stack slot.
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unsigned SparcInstrInfo::isStoreToStackSlot(const MachineInstr *MI,
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int &FrameIndex) const {
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if (MI->getOpcode() == SP::STri ||
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MI->getOpcode() == SP::STXri ||
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MI->getOpcode() == SP::STFri ||
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MI->getOpcode() == SP::STDFri ||
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MI->getOpcode() == SP::STQFri) {
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if (MI->getOperand(0).isFI() && MI->getOperand(1).isImm() &&
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MI->getOperand(1).getImm() == 0) {
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FrameIndex = MI->getOperand(0).getIndex();
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return MI->getOperand(2).getReg();
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}
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}
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return 0;
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}
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static bool IsIntegerCC(unsigned CC)
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{
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return (CC <= SPCC::ICC_VC);
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}
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static SPCC::CondCodes GetOppositeBranchCondition(SPCC::CondCodes CC)
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{
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switch(CC) {
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case SPCC::ICC_A: return SPCC::ICC_N;
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case SPCC::ICC_N: return SPCC::ICC_A;
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case SPCC::ICC_NE: return SPCC::ICC_E;
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case SPCC::ICC_E: return SPCC::ICC_NE;
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case SPCC::ICC_G: return SPCC::ICC_LE;
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case SPCC::ICC_LE: return SPCC::ICC_G;
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case SPCC::ICC_GE: return SPCC::ICC_L;
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case SPCC::ICC_L: return SPCC::ICC_GE;
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case SPCC::ICC_GU: return SPCC::ICC_LEU;
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case SPCC::ICC_LEU: return SPCC::ICC_GU;
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case SPCC::ICC_CC: return SPCC::ICC_CS;
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case SPCC::ICC_CS: return SPCC::ICC_CC;
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case SPCC::ICC_POS: return SPCC::ICC_NEG;
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case SPCC::ICC_NEG: return SPCC::ICC_POS;
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case SPCC::ICC_VC: return SPCC::ICC_VS;
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case SPCC::ICC_VS: return SPCC::ICC_VC;
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case SPCC::FCC_A: return SPCC::FCC_N;
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case SPCC::FCC_N: return SPCC::FCC_A;
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case SPCC::FCC_U: return SPCC::FCC_O;
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case SPCC::FCC_O: return SPCC::FCC_U;
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case SPCC::FCC_G: return SPCC::FCC_ULE;
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case SPCC::FCC_LE: return SPCC::FCC_UG;
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case SPCC::FCC_UG: return SPCC::FCC_LE;
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case SPCC::FCC_ULE: return SPCC::FCC_G;
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case SPCC::FCC_L: return SPCC::FCC_UGE;
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case SPCC::FCC_GE: return SPCC::FCC_UL;
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case SPCC::FCC_UL: return SPCC::FCC_GE;
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case SPCC::FCC_UGE: return SPCC::FCC_L;
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case SPCC::FCC_LG: return SPCC::FCC_UE;
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case SPCC::FCC_UE: return SPCC::FCC_LG;
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case SPCC::FCC_NE: return SPCC::FCC_E;
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case SPCC::FCC_E: return SPCC::FCC_NE;
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}
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llvm_unreachable("Invalid cond code");
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}
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bool SparcInstrInfo::AnalyzeBranch(MachineBasicBlock &MBB,
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MachineBasicBlock *&TBB,
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MachineBasicBlock *&FBB,
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SmallVectorImpl<MachineOperand> &Cond,
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bool AllowModify) const
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{
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MachineBasicBlock::iterator I = MBB.end();
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MachineBasicBlock::iterator UnCondBrIter = MBB.end();
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while (I != MBB.begin()) {
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--I;
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if (I->isDebugValue())
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continue;
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// When we see a non-terminator, we are done.
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if (!isUnpredicatedTerminator(I))
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break;
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// Terminator is not a branch.
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if (!I->isBranch())
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return true;
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// Handle Unconditional branches.
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if (I->getOpcode() == SP::BA) {
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UnCondBrIter = I;
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if (!AllowModify) {
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TBB = I->getOperand(0).getMBB();
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continue;
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}
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while (std::next(I) != MBB.end())
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std::next(I)->eraseFromParent();
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Cond.clear();
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FBB = nullptr;
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if (MBB.isLayoutSuccessor(I->getOperand(0).getMBB())) {
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TBB = nullptr;
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I->eraseFromParent();
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I = MBB.end();
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UnCondBrIter = MBB.end();
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continue;
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}
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TBB = I->getOperand(0).getMBB();
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continue;
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}
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unsigned Opcode = I->getOpcode();
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if (Opcode != SP::BCOND && Opcode != SP::FBCOND)
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return true; // Unknown Opcode.
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SPCC::CondCodes BranchCode = (SPCC::CondCodes)I->getOperand(1).getImm();
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if (Cond.empty()) {
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MachineBasicBlock *TargetBB = I->getOperand(0).getMBB();
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if (AllowModify && UnCondBrIter != MBB.end() &&
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MBB.isLayoutSuccessor(TargetBB)) {
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// Transform the code
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//
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// brCC L1
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// ba L2
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// L1:
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// ..
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// L2:
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//
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// into
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//
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// brnCC L2
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// L1:
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// ...
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// L2:
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//
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BranchCode = GetOppositeBranchCondition(BranchCode);
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MachineBasicBlock::iterator OldInst = I;
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BuildMI(MBB, UnCondBrIter, MBB.findDebugLoc(I), get(Opcode))
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.addMBB(UnCondBrIter->getOperand(0).getMBB()).addImm(BranchCode);
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BuildMI(MBB, UnCondBrIter, MBB.findDebugLoc(I), get(SP::BA))
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.addMBB(TargetBB);
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OldInst->eraseFromParent();
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UnCondBrIter->eraseFromParent();
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UnCondBrIter = MBB.end();
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I = MBB.end();
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continue;
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}
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FBB = TBB;
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TBB = I->getOperand(0).getMBB();
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Cond.push_back(MachineOperand::CreateImm(BranchCode));
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continue;
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}
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// FIXME: Handle subsequent conditional branches.
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// For now, we can't handle multiple conditional branches.
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return true;
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}
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return false;
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}
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unsigned
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SparcInstrInfo::InsertBranch(MachineBasicBlock &MBB,MachineBasicBlock *TBB,
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MachineBasicBlock *FBB,
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const SmallVectorImpl<MachineOperand> &Cond,
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DebugLoc DL) const {
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assert(TBB && "InsertBranch must not be told to insert a fallthrough");
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assert((Cond.size() == 1 || Cond.size() == 0) &&
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"Sparc branch conditions should have one component!");
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if (Cond.empty()) {
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assert(!FBB && "Unconditional branch with multiple successors!");
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BuildMI(&MBB, DL, get(SP::BA)).addMBB(TBB);
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return 1;
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}
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// Conditional branch
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unsigned CC = Cond[0].getImm();
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if (IsIntegerCC(CC))
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BuildMI(&MBB, DL, get(SP::BCOND)).addMBB(TBB).addImm(CC);
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else
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BuildMI(&MBB, DL, get(SP::FBCOND)).addMBB(TBB).addImm(CC);
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if (!FBB)
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return 1;
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BuildMI(&MBB, DL, get(SP::BA)).addMBB(FBB);
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return 2;
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}
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unsigned SparcInstrInfo::RemoveBranch(MachineBasicBlock &MBB) const
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{
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MachineBasicBlock::iterator I = MBB.end();
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unsigned Count = 0;
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while (I != MBB.begin()) {
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--I;
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if (I->isDebugValue())
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continue;
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if (I->getOpcode() != SP::BA
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&& I->getOpcode() != SP::BCOND
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&& I->getOpcode() != SP::FBCOND)
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break; // Not a branch
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I->eraseFromParent();
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I = MBB.end();
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++Count;
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}
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return Count;
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}
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void SparcInstrInfo::copyPhysReg(MachineBasicBlock &MBB,
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MachineBasicBlock::iterator I, DebugLoc DL,
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unsigned DestReg, unsigned SrcReg,
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bool KillSrc) const {
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unsigned numSubRegs = 0;
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unsigned movOpc = 0;
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const unsigned *subRegIdx = nullptr;
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const unsigned DFP_FP_SubRegsIdx[] = { SP::sub_even, SP::sub_odd };
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const unsigned QFP_DFP_SubRegsIdx[] = { SP::sub_even64, SP::sub_odd64 };
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const unsigned QFP_FP_SubRegsIdx[] = { SP::sub_even, SP::sub_odd,
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SP::sub_odd64_then_sub_even,
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SP::sub_odd64_then_sub_odd };
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if (SP::IntRegsRegClass.contains(DestReg, SrcReg))
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BuildMI(MBB, I, DL, get(SP::ORrr), DestReg).addReg(SP::G0)
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.addReg(SrcReg, getKillRegState(KillSrc));
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else if (SP::FPRegsRegClass.contains(DestReg, SrcReg))
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BuildMI(MBB, I, DL, get(SP::FMOVS), DestReg)
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.addReg(SrcReg, getKillRegState(KillSrc));
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else if (SP::DFPRegsRegClass.contains(DestReg, SrcReg)) {
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if (Subtarget.isV9()) {
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BuildMI(MBB, I, DL, get(SP::FMOVD), DestReg)
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.addReg(SrcReg, getKillRegState(KillSrc));
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} else {
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// Use two FMOVS instructions.
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subRegIdx = DFP_FP_SubRegsIdx;
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numSubRegs = 2;
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movOpc = SP::FMOVS;
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}
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} else if (SP::QFPRegsRegClass.contains(DestReg, SrcReg)) {
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if (Subtarget.isV9()) {
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if (Subtarget.hasHardQuad()) {
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BuildMI(MBB, I, DL, get(SP::FMOVQ), DestReg)
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.addReg(SrcReg, getKillRegState(KillSrc));
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} else {
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// Use two FMOVD instructions.
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subRegIdx = QFP_DFP_SubRegsIdx;
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numSubRegs = 2;
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movOpc = SP::FMOVD;
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}
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} else {
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// Use four FMOVS instructions.
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subRegIdx = QFP_FP_SubRegsIdx;
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numSubRegs = 4;
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movOpc = SP::FMOVS;
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}
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} else
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llvm_unreachable("Impossible reg-to-reg copy");
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if (numSubRegs == 0 || subRegIdx == nullptr || movOpc == 0)
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return;
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const TargetRegisterInfo *TRI = &getRegisterInfo();
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MachineInstr *MovMI = nullptr;
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for (unsigned i = 0; i != numSubRegs; ++i) {
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unsigned Dst = TRI->getSubReg(DestReg, subRegIdx[i]);
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unsigned Src = TRI->getSubReg(SrcReg, subRegIdx[i]);
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assert(Dst && Src && "Bad sub-register");
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MovMI = BuildMI(MBB, I, DL, get(movOpc), Dst).addReg(Src);
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}
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// Add implicit super-register defs and kills to the last MovMI.
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MovMI->addRegisterDefined(DestReg, TRI);
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if (KillSrc)
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MovMI->addRegisterKilled(SrcReg, TRI);
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}
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void SparcInstrInfo::
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storeRegToStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
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unsigned SrcReg, bool isKill, int FI,
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const TargetRegisterClass *RC,
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const TargetRegisterInfo *TRI) const {
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DebugLoc DL;
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if (I != MBB.end()) DL = I->getDebugLoc();
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MachineFunction *MF = MBB.getParent();
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const MachineFrameInfo &MFI = *MF->getFrameInfo();
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MachineMemOperand *MMO =
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MF->getMachineMemOperand(MachinePointerInfo::getFixedStack(FI),
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MachineMemOperand::MOStore,
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MFI.getObjectSize(FI),
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MFI.getObjectAlignment(FI));
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// On the order of operands here: think "[FrameIdx + 0] = SrcReg".
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if (RC == &SP::I64RegsRegClass)
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BuildMI(MBB, I, DL, get(SP::STXri)).addFrameIndex(FI).addImm(0)
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.addReg(SrcReg, getKillRegState(isKill)).addMemOperand(MMO);
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else if (RC == &SP::IntRegsRegClass)
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BuildMI(MBB, I, DL, get(SP::STri)).addFrameIndex(FI).addImm(0)
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.addReg(SrcReg, getKillRegState(isKill)).addMemOperand(MMO);
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else if (RC == &SP::FPRegsRegClass)
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BuildMI(MBB, I, DL, get(SP::STFri)).addFrameIndex(FI).addImm(0)
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.addReg(SrcReg, getKillRegState(isKill)).addMemOperand(MMO);
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else if (SP::DFPRegsRegClass.hasSubClassEq(RC))
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BuildMI(MBB, I, DL, get(SP::STDFri)).addFrameIndex(FI).addImm(0)
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.addReg(SrcReg, getKillRegState(isKill)).addMemOperand(MMO);
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else if (SP::QFPRegsRegClass.hasSubClassEq(RC))
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// Use STQFri irrespective of its legality. If STQ is not legal, it will be
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// lowered into two STDs in eliminateFrameIndex.
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BuildMI(MBB, I, DL, get(SP::STQFri)).addFrameIndex(FI).addImm(0)
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.addReg(SrcReg, getKillRegState(isKill)).addMemOperand(MMO);
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else
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llvm_unreachable("Can't store this register to stack slot");
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}
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void SparcInstrInfo::
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loadRegFromStackSlot(MachineBasicBlock &MBB, MachineBasicBlock::iterator I,
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unsigned DestReg, int FI,
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const TargetRegisterClass *RC,
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const TargetRegisterInfo *TRI) const {
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DebugLoc DL;
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if (I != MBB.end()) DL = I->getDebugLoc();
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MachineFunction *MF = MBB.getParent();
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const MachineFrameInfo &MFI = *MF->getFrameInfo();
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MachineMemOperand *MMO =
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MF->getMachineMemOperand(MachinePointerInfo::getFixedStack(FI),
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MachineMemOperand::MOLoad,
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MFI.getObjectSize(FI),
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MFI.getObjectAlignment(FI));
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if (RC == &SP::I64RegsRegClass)
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BuildMI(MBB, I, DL, get(SP::LDXri), DestReg).addFrameIndex(FI).addImm(0)
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.addMemOperand(MMO);
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else if (RC == &SP::IntRegsRegClass)
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BuildMI(MBB, I, DL, get(SP::LDri), DestReg).addFrameIndex(FI).addImm(0)
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.addMemOperand(MMO);
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else if (RC == &SP::FPRegsRegClass)
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BuildMI(MBB, I, DL, get(SP::LDFri), DestReg).addFrameIndex(FI).addImm(0)
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.addMemOperand(MMO);
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else if (SP::DFPRegsRegClass.hasSubClassEq(RC))
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BuildMI(MBB, I, DL, get(SP::LDDFri), DestReg).addFrameIndex(FI).addImm(0)
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.addMemOperand(MMO);
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else if (SP::QFPRegsRegClass.hasSubClassEq(RC))
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// Use LDQFri irrespective of its legality. If LDQ is not legal, it will be
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// lowered into two LDDs in eliminateFrameIndex.
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BuildMI(MBB, I, DL, get(SP::LDQFri), DestReg).addFrameIndex(FI).addImm(0)
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.addMemOperand(MMO);
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else
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llvm_unreachable("Can't load this register from stack slot");
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}
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unsigned SparcInstrInfo::getGlobalBaseReg(MachineFunction *MF) const
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{
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SparcMachineFunctionInfo *SparcFI = MF->getInfo<SparcMachineFunctionInfo>();
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unsigned GlobalBaseReg = SparcFI->getGlobalBaseReg();
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if (GlobalBaseReg != 0)
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return GlobalBaseReg;
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// Insert the set of GlobalBaseReg into the first MBB of the function
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MachineBasicBlock &FirstMBB = MF->front();
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MachineBasicBlock::iterator MBBI = FirstMBB.begin();
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MachineRegisterInfo &RegInfo = MF->getRegInfo();
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const TargetRegisterClass *PtrRC =
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Subtarget.is64Bit() ? &SP::I64RegsRegClass : &SP::IntRegsRegClass;
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GlobalBaseReg = RegInfo.createVirtualRegister(PtrRC);
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DebugLoc dl;
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BuildMI(FirstMBB, MBBI, dl, get(SP::GETPCX), GlobalBaseReg);
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SparcFI->setGlobalBaseReg(GlobalBaseReg);
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return GlobalBaseReg;
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}
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