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f785676f2a
all of the features in the current working draft of the upcoming C++ standard, provisionally named C++1y. The code generator's performance is greatly increased, and the loop auto-vectorizer is now enabled at -Os and -O2 in addition to -O3. The PowerPC backend has made several major improvements to code generation quality and compile time, and the X86, SPARC, ARM32, Aarch64 and SystemZ backends have all seen major feature work. Release notes for llvm and clang can be found here: <http://llvm.org/releases/3.4/docs/ReleaseNotes.html> <http://llvm.org/releases/3.4/tools/clang/docs/ReleaseNotes.html> MFC after: 1 month
100 lines
3 KiB
C++
100 lines
3 KiB
C++
//===-- SystemZMCInstLower.cpp - Lower MachineInstr to MCInst -------------===//
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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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#include "SystemZMCInstLower.h"
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#include "SystemZAsmPrinter.h"
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#include "llvm/MC/MCExpr.h"
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#include "llvm/MC/MCStreamer.h"
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#include "llvm/Target/Mangler.h"
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using namespace llvm;
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// Return the VK_* enumeration for MachineOperand target flags Flags.
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static MCSymbolRefExpr::VariantKind getVariantKind(unsigned Flags) {
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switch (Flags & SystemZII::MO_SYMBOL_MODIFIER) {
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case 0:
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return MCSymbolRefExpr::VK_None;
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case SystemZII::MO_GOT:
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return MCSymbolRefExpr::VK_GOT;
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}
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llvm_unreachable("Unrecognised MO_ACCESS_MODEL");
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}
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SystemZMCInstLower::SystemZMCInstLower(MCContext &ctx,
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SystemZAsmPrinter &asmprinter)
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: Ctx(ctx), AsmPrinter(asmprinter) {}
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const MCExpr *
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SystemZMCInstLower::getExpr(const MachineOperand &MO,
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MCSymbolRefExpr::VariantKind Kind) const {
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const MCSymbol *Symbol;
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bool HasOffset = true;
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switch (MO.getType()) {
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case MachineOperand::MO_MachineBasicBlock:
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Symbol = MO.getMBB()->getSymbol();
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HasOffset = false;
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break;
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case MachineOperand::MO_GlobalAddress:
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Symbol = AsmPrinter.getSymbol(MO.getGlobal());
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break;
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case MachineOperand::MO_ExternalSymbol:
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Symbol = AsmPrinter.GetExternalSymbolSymbol(MO.getSymbolName());
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break;
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case MachineOperand::MO_JumpTableIndex:
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Symbol = AsmPrinter.GetJTISymbol(MO.getIndex());
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HasOffset = false;
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break;
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case MachineOperand::MO_ConstantPoolIndex:
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Symbol = AsmPrinter.GetCPISymbol(MO.getIndex());
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break;
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case MachineOperand::MO_BlockAddress:
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Symbol = AsmPrinter.GetBlockAddressSymbol(MO.getBlockAddress());
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break;
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default:
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llvm_unreachable("unknown operand type");
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}
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const MCExpr *Expr = MCSymbolRefExpr::Create(Symbol, Kind, Ctx);
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if (HasOffset)
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if (int64_t Offset = MO.getOffset()) {
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const MCExpr *OffsetExpr = MCConstantExpr::Create(Offset, Ctx);
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Expr = MCBinaryExpr::CreateAdd(Expr, OffsetExpr, Ctx);
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}
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return Expr;
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}
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MCOperand SystemZMCInstLower::lowerOperand(const MachineOperand &MO) const {
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switch (MO.getType()) {
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case MachineOperand::MO_Register:
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return MCOperand::CreateReg(MO.getReg());
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case MachineOperand::MO_Immediate:
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return MCOperand::CreateImm(MO.getImm());
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default: {
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MCSymbolRefExpr::VariantKind Kind = getVariantKind(MO.getTargetFlags());
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return MCOperand::CreateExpr(getExpr(MO, Kind));
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}
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}
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}
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void SystemZMCInstLower::lower(const MachineInstr *MI, MCInst &OutMI) const {
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OutMI.setOpcode(MI->getOpcode());
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for (unsigned I = 0, E = MI->getNumOperands(); I != E; ++I) {
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const MachineOperand &MO = MI->getOperand(I);
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// Ignore all implicit register operands.
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if (!MO.isReg() || !MO.isImplicit())
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OutMI.addOperand(lowerOperand(MO));
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}
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}
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