//
//===----------------------------------------------------------------------===//
-#include "X86MCInstLower.h"
#include "X86AsmPrinter.h"
-#include "X86COFFMachineModuleInfo.h"
+#include "X86RegisterInfo.h"
#include "InstPrinter/X86ATTInstPrinter.h"
-#include "llvm/Type.h"
+#include "MCTargetDesc/X86BaseInfo.h"
+#include "llvm/ADT/SmallString.h"
+#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineModuleInfoImpls.h"
+#include "llvm/CodeGen/StackMaps.h"
+#include "llvm/IR/DataLayout.h"
+#include "llvm/IR/GlobalValue.h"
+#include "llvm/IR/Mangler.h"
#include "llvm/MC/MCAsmInfo.h"
+#include "llvm/MC/MCCodeEmitter.h"
#include "llvm/MC/MCContext.h"
#include "llvm/MC/MCExpr.h"
#include "llvm/MC/MCInst.h"
+#include "llvm/MC/MCInstBuilder.h"
#include "llvm/MC/MCStreamer.h"
#include "llvm/MC/MCSymbol.h"
-#include "llvm/Target/Mangler.h"
-#include "llvm/Support/FormattedStream.h"
-#include "llvm/ADT/SmallString.h"
+#include "llvm/Support/TargetRegistry.h"
using namespace llvm;
-X86MCInstLower::X86MCInstLower(Mangler *mang, const MachineFunction &mf,
+namespace {
+
+/// X86MCInstLower - This class is used to lower an MachineInstr into an MCInst.
+class X86MCInstLower {
+ MCContext &Ctx;
+ const MachineFunction &MF;
+ const TargetMachine &TM;
+ const MCAsmInfo &MAI;
+ X86AsmPrinter &AsmPrinter;
+public:
+ X86MCInstLower(const MachineFunction &MF, X86AsmPrinter &asmprinter);
+
+ void Lower(const MachineInstr *MI, MCInst &OutMI) const;
+
+ MCSymbol *GetSymbolFromOperand(const MachineOperand &MO) const;
+ MCOperand LowerSymbolOperand(const MachineOperand &MO, MCSymbol *Sym) const;
+
+private:
+ MachineModuleInfoMachO &getMachOMMI() const;
+ Mangler *getMang() const {
+ return AsmPrinter.Mang;
+ }
+};
+
+} // end anonymous namespace
+
+// Emit a minimal sequence of nops spanning NumBytes bytes.
+static void EmitNops(MCStreamer &OS, unsigned NumBytes, bool Is64Bit,
+ const MCSubtargetInfo &STI);
+
+namespace llvm {
+ X86AsmPrinter::StackMapShadowTracker::StackMapShadowTracker(TargetMachine &TM)
+ : TM(TM), Count(false), RequiredShadowSize(0), CurrentShadowSize(0) {}
+
+ X86AsmPrinter::StackMapShadowTracker::~StackMapShadowTracker() {}
+
+ void
+ X86AsmPrinter::StackMapShadowTracker::startFunction(MachineFunction &MF) {
+ CodeEmitter.reset(TM.getTarget().createMCCodeEmitter(*TM.getInstrInfo(),
+ *TM.getRegisterInfo(),
+ *TM.getSubtargetImpl(),
+ MF.getContext()));
+ }
+
+ void X86AsmPrinter::StackMapShadowTracker::count(MCInst &Inst,
+ const MCSubtargetInfo &STI) {
+ if (Count) {
+ SmallString<256> Code;
+ SmallVector<MCFixup, 4> Fixups;
+ raw_svector_ostream VecOS(Code);
+ CodeEmitter->EncodeInstruction(Inst, VecOS, Fixups, STI);
+ VecOS.flush();
+ CurrentShadowSize += Code.size();
+ if (CurrentShadowSize >= RequiredShadowSize)
+ Count = false; // The shadow is big enough. Stop counting.
+ }
+ }
+
+ void X86AsmPrinter::StackMapShadowTracker::emitShadowPadding(
+ MCStreamer &OutStreamer, const MCSubtargetInfo &STI) {
+ if (Count && CurrentShadowSize < RequiredShadowSize)
+ EmitNops(OutStreamer, RequiredShadowSize - CurrentShadowSize,
+ TM.getSubtarget<X86Subtarget>().is64Bit(), STI);
+ Count = false;
+ }
+
+ void X86AsmPrinter::EmitAndCountInstruction(MCInst &Inst) {
+ OutStreamer.EmitInstruction(Inst, getSubtargetInfo());
+ SMShadowTracker.count(Inst, getSubtargetInfo());
+ }
+} // end llvm namespace
+
+X86MCInstLower::X86MCInstLower(const MachineFunction &mf,
X86AsmPrinter &asmprinter)
-: Ctx(mf.getContext()), Mang(mang), MF(mf), TM(mf.getTarget()),
+: Ctx(mf.getContext()), MF(mf), TM(mf.getTarget()),
MAI(*TM.getMCAsmInfo()), AsmPrinter(asmprinter) {}
MachineModuleInfoMachO &X86MCInstLower::getMachOMMI() const {
/// operand to an MCSymbol.
MCSymbol *X86MCInstLower::
GetSymbolFromOperand(const MachineOperand &MO) const {
- assert((MO.isGlobal() || MO.isSymbol()) && "Isn't a symbol reference");
+ const DataLayout *DL = TM.getDataLayout();
+ assert((MO.isGlobal() || MO.isSymbol() || MO.isMBB()) && "Isn't a symbol reference");
SmallString<128> Name;
+ StringRef Suffix;
- if (!MO.isGlobal()) {
- assert(MO.isSymbol());
- Name += MAI.getGlobalPrefix();
- Name += MO.getSymbolName();
- } else {
+ switch (MO.getTargetFlags()) {
+ case X86II::MO_DLLIMPORT:
+ // Handle dllimport linkage.
+ Name += "__imp_";
+ break;
+ case X86II::MO_DARWIN_STUB:
+ Suffix = "$stub";
+ break;
+ case X86II::MO_DARWIN_NONLAZY:
+ case X86II::MO_DARWIN_NONLAZY_PIC_BASE:
+ case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE:
+ Suffix = "$non_lazy_ptr";
+ break;
+ }
+
+ if (!Suffix.empty())
+ Name += DL->getPrivateGlobalPrefix();
+
+ unsigned PrefixLen = Name.size();
+
+ if (MO.isGlobal()) {
const GlobalValue *GV = MO.getGlobal();
- bool isImplicitlyPrivate = false;
- if (MO.getTargetFlags() == X86II::MO_DARWIN_STUB ||
- MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY ||
- MO.getTargetFlags() == X86II::MO_DARWIN_NONLAZY_PIC_BASE ||
- MO.getTargetFlags() == X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE)
- isImplicitlyPrivate = true;
-
- Mang->getNameWithPrefix(Name, GV, isImplicitlyPrivate);
+ AsmPrinter.getNameWithPrefix(Name, GV);
+ } else if (MO.isSymbol()) {
+ getMang()->getNameWithPrefix(Name, MO.getSymbolName());
+ } else if (MO.isMBB()) {
+ Name += MO.getMBB()->getSymbol()->getName();
}
+ unsigned OrigLen = Name.size() - PrefixLen;
+
+ Name += Suffix;
+ MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name);
+
+ StringRef OrigName = StringRef(Name).substr(PrefixLen, OrigLen);
// If the target flags on the operand changes the name of the symbol, do that
// before we return the symbol.
switch (MO.getTargetFlags()) {
default: break;
- case X86II::MO_DLLIMPORT: {
- // Handle dllimport linkage.
- const char *Prefix = "__imp_";
- Name.insert(Name.begin(), Prefix, Prefix+strlen(Prefix));
- break;
- }
case X86II::MO_DARWIN_NONLAZY:
case X86II::MO_DARWIN_NONLAZY_PIC_BASE: {
- Name += "$non_lazy_ptr";
- MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name.str());
-
MachineModuleInfoImpl::StubValueTy &StubSym =
getMachOMMI().getGVStubEntry(Sym);
- if (StubSym.getPointer() == 0) {
+ if (!StubSym.getPointer()) {
assert(MO.isGlobal() && "Extern symbol not handled yet");
StubSym =
MachineModuleInfoImpl::
- StubValueTy(Mang->getSymbol(MO.getGlobal()),
+ StubValueTy(AsmPrinter.getSymbol(MO.getGlobal()),
!MO.getGlobal()->hasInternalLinkage());
}
- return Sym;
+ break;
}
case X86II::MO_DARWIN_HIDDEN_NONLAZY_PIC_BASE: {
- Name += "$non_lazy_ptr";
- MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name.str());
MachineModuleInfoImpl::StubValueTy &StubSym =
getMachOMMI().getHiddenGVStubEntry(Sym);
- if (StubSym.getPointer() == 0) {
+ if (!StubSym.getPointer()) {
assert(MO.isGlobal() && "Extern symbol not handled yet");
StubSym =
MachineModuleInfoImpl::
- StubValueTy(Mang->getSymbol(MO.getGlobal()),
+ StubValueTy(AsmPrinter.getSymbol(MO.getGlobal()),
!MO.getGlobal()->hasInternalLinkage());
}
- return Sym;
+ break;
}
case X86II::MO_DARWIN_STUB: {
- Name += "$stub";
- MCSymbol *Sym = Ctx.GetOrCreateSymbol(Name.str());
MachineModuleInfoImpl::StubValueTy &StubSym =
getMachOMMI().getFnStubEntry(Sym);
if (StubSym.getPointer())
if (MO.isGlobal()) {
StubSym =
MachineModuleInfoImpl::
- StubValueTy(Mang->getSymbol(MO.getGlobal()),
+ StubValueTy(AsmPrinter.getSymbol(MO.getGlobal()),
!MO.getGlobal()->hasInternalLinkage());
} else {
- Name.erase(Name.end()-5, Name.end());
StubSym =
MachineModuleInfoImpl::
- StubValueTy(Ctx.GetOrCreateSymbol(Name.str()), false);
+ StubValueTy(Ctx.GetOrCreateSymbol(OrigName), false);
}
- return Sym;
+ break;
}
}
- return Ctx.GetOrCreateSymbol(Name.str());
+ return Sym;
}
MCOperand X86MCInstLower::LowerSymbolOperand(const MachineOperand &MO,
MCSymbol *Sym) const {
// FIXME: We would like an efficient form for this, so we don't have to do a
// lot of extra uniquing.
- const MCExpr *Expr = 0;
+ const MCExpr *Expr = nullptr;
MCSymbolRefExpr::VariantKind RefKind = MCSymbolRefExpr::VK_None;
switch (MO.getTargetFlags()) {
break;
}
- if (Expr == 0)
+ if (!Expr)
Expr = MCSymbolRefExpr::Create(Sym, RefKind, Ctx);
- if (!MO.isJTI() && MO.getOffset())
+ if (!MO.isJTI() && !MO.isMBB() && MO.getOffset())
Expr = MCBinaryExpr::CreateAdd(Expr,
MCConstantExpr::Create(MO.getOffset(), Ctx),
Ctx);
}
-
-static void lower_subreg32(MCInst *MI, unsigned OpNo) {
- // Convert registers in the addr mode according to subreg32.
- unsigned Reg = MI->getOperand(OpNo).getReg();
- if (Reg != 0)
- MI->getOperand(OpNo).setReg(getX86SubSuperRegister(Reg, MVT::i32));
-}
-
-static void lower_lea64_32mem(MCInst *MI, unsigned OpNo) {
- // Convert registers in the addr mode according to subreg64.
- for (unsigned i = 0; i != 4; ++i) {
- if (!MI->getOperand(OpNo+i).isReg()) continue;
-
- unsigned Reg = MI->getOperand(OpNo+i).getReg();
- if (Reg == 0) continue;
-
- MI->getOperand(OpNo+i).setReg(getX86SubSuperRegister(Reg, MVT::i64));
- }
-}
-
-/// LowerSubReg32_Op0 - Things like MOVZX16rr8 -> MOVZX32rr8.
-static void LowerSubReg32_Op0(MCInst &OutMI, unsigned NewOpc) {
- OutMI.setOpcode(NewOpc);
- lower_subreg32(&OutMI, 0);
-}
-/// LowerUnaryToTwoAddr - R = setb -> R = sbb R, R
-static void LowerUnaryToTwoAddr(MCInst &OutMI, unsigned NewOpc) {
- OutMI.setOpcode(NewOpc);
- OutMI.addOperand(OutMI.getOperand(0));
- OutMI.addOperand(OutMI.getOperand(0));
-}
-
/// \brief Simplify FOO $imm, %{al,ax,eax,rax} to FOO $imm, for instruction with
/// a short fixed-register form.
static void SimplifyShortImmForm(MCInst &Inst, unsigned Opcode) {
Inst.addOperand(Saved);
}
+/// \brief If a movsx instruction has a shorter encoding for the used register
+/// simplify the instruction to use it instead.
+static void SimplifyMOVSX(MCInst &Inst) {
+ unsigned NewOpcode = 0;
+ unsigned Op0 = Inst.getOperand(0).getReg(), Op1 = Inst.getOperand(1).getReg();
+ switch (Inst.getOpcode()) {
+ default:
+ llvm_unreachable("Unexpected instruction!");
+ case X86::MOVSX16rr8: // movsbw %al, %ax --> cbtw
+ if (Op0 == X86::AX && Op1 == X86::AL)
+ NewOpcode = X86::CBW;
+ break;
+ case X86::MOVSX32rr16: // movswl %ax, %eax --> cwtl
+ if (Op0 == X86::EAX && Op1 == X86::AX)
+ NewOpcode = X86::CWDE;
+ break;
+ case X86::MOVSX64rr32: // movslq %eax, %rax --> cltq
+ if (Op0 == X86::RAX && Op1 == X86::EAX)
+ NewOpcode = X86::CDQE;
+ break;
+ }
+
+ if (NewOpcode != 0) {
+ Inst = MCInst();
+ Inst.setOpcode(NewOpcode);
+ }
+}
+
/// \brief Simplify things like MOV32rm to MOV32o32a.
static void SimplifyShortMoveForm(X86AsmPrinter &Printer, MCInst &Inst,
unsigned Opcode) {
unsigned RegOp = IsStore ? 0 : 5;
unsigned AddrOp = AddrBase + 3;
assert(Inst.getNumOperands() == 6 && Inst.getOperand(RegOp).isReg() &&
- Inst.getOperand(AddrBase + 0).isReg() && // base
- Inst.getOperand(AddrBase + 1).isImm() && // scale
- Inst.getOperand(AddrBase + 2).isReg() && // index register
- (Inst.getOperand(AddrOp).isExpr() || // address
- Inst.getOperand(AddrOp).isImm())&&
- Inst.getOperand(AddrBase + 4).isReg() && // segment
+ Inst.getOperand(AddrBase + X86::AddrBaseReg).isReg() &&
+ Inst.getOperand(AddrBase + X86::AddrScaleAmt).isImm() &&
+ Inst.getOperand(AddrBase + X86::AddrIndexReg).isReg() &&
+ Inst.getOperand(AddrBase + X86::AddrSegmentReg).isReg() &&
+ (Inst.getOperand(AddrOp).isExpr() ||
+ Inst.getOperand(AddrOp).isImm()) &&
"Unexpected instruction!");
// Check whether the destination register can be fixed.
}
if (Absolute &&
- (Inst.getOperand(AddrBase + 0).getReg() != 0 ||
- Inst.getOperand(AddrBase + 2).getReg() != 0 ||
- Inst.getOperand(AddrBase + 4).getReg() != 0 ||
- Inst.getOperand(AddrBase + 1).getImm() != 1))
+ (Inst.getOperand(AddrBase + X86::AddrBaseReg).getReg() != 0 ||
+ Inst.getOperand(AddrBase + X86::AddrScaleAmt).getImm() != 1 ||
+ Inst.getOperand(AddrBase + X86::AddrIndexReg).getReg() != 0))
return;
// If so, rewrite the instruction.
MCOperand Saved = Inst.getOperand(AddrOp);
+ MCOperand Seg = Inst.getOperand(AddrBase + X86::AddrSegmentReg);
Inst = MCInst();
Inst.setOpcode(Opcode);
Inst.addOperand(Saved);
+ Inst.addOperand(Seg);
+}
+
+static unsigned getRetOpcode(const X86Subtarget &Subtarget)
+{
+ return Subtarget.is64Bit() ? X86::RETQ : X86::RETL;
}
void X86MCInstLower::Lower(const MachineInstr *MI, MCInst &OutMI) const {
MCOp = MCOperand::CreateImm(MO.getImm());
break;
case MachineOperand::MO_MachineBasicBlock:
- MCOp = MCOperand::CreateExpr(MCSymbolRefExpr::Create(
- MO.getMBB()->getSymbol(), Ctx));
- break;
case MachineOperand::MO_GlobalAddress:
case MachineOperand::MO_ExternalSymbol:
MCOp = LowerSymbolOperand(MO, GetSymbolFromOperand(MO));
// Handle a few special cases to eliminate operand modifiers.
ReSimplify:
switch (OutMI.getOpcode()) {
- case X86::LEA64_32r: // Handle 'subreg rewriting' for the lea64_32mem operand.
- lower_lea64_32mem(&OutMI, 1);
- // FALL THROUGH.
+ case X86::LEA64_32r:
case X86::LEA64r:
case X86::LEA16r:
case X86::LEA32r:
assert(OutMI.getOperand(1+X86::AddrSegmentReg).getReg() == 0 &&
"LEA has segment specified!");
break;
- case X86::MOVZX64rr32: LowerSubReg32_Op0(OutMI, X86::MOV32rr); break;
- case X86::MOVZX64rm32: LowerSubReg32_Op0(OutMI, X86::MOV32rm); break;
- case X86::MOV64ri64i32: LowerSubReg32_Op0(OutMI, X86::MOV32ri); break;
- case X86::MOVZX64rr8: LowerSubReg32_Op0(OutMI, X86::MOVZX32rr8); break;
- case X86::MOVZX64rm8: LowerSubReg32_Op0(OutMI, X86::MOVZX32rm8); break;
- case X86::MOVZX64rr16: LowerSubReg32_Op0(OutMI, X86::MOVZX32rr16); break;
- case X86::MOVZX64rm16: LowerSubReg32_Op0(OutMI, X86::MOVZX32rm16); break;
- case X86::SETB_C8r: LowerUnaryToTwoAddr(OutMI, X86::SBB8rr); break;
- case X86::SETB_C16r: LowerUnaryToTwoAddr(OutMI, X86::SBB16rr); break;
- case X86::SETB_C32r: LowerUnaryToTwoAddr(OutMI, X86::SBB32rr); break;
- case X86::SETB_C64r: LowerUnaryToTwoAddr(OutMI, X86::SBB64rr); break;
- case X86::MOV8r0: LowerUnaryToTwoAddr(OutMI, X86::XOR8rr); break;
- case X86::MOV32r0: LowerUnaryToTwoAddr(OutMI, X86::XOR32rr); break;
- case X86::V_SETALLONES: LowerUnaryToTwoAddr(OutMI, X86::PCMPEQDrr); break;
- case X86::AVX_SET0PSY: LowerUnaryToTwoAddr(OutMI, X86::VXORPSYrr); break;
- case X86::AVX_SET0PDY: LowerUnaryToTwoAddr(OutMI, X86::VXORPDYrr); break;
- case X86::AVX_SETALLONES: LowerUnaryToTwoAddr(OutMI, X86::VPCMPEQDrr); break;
- case X86::AVX2_SETALLONES: LowerUnaryToTwoAddr(OutMI, X86::VPCMPEQDYrr);break;
- case X86::AVX2_SET0: LowerUnaryToTwoAddr(OutMI, X86::VPXORYrr); break;
-
- case X86::MOV16r0:
- LowerSubReg32_Op0(OutMI, X86::MOV32r0); // MOV16r0 -> MOV32r0
- LowerUnaryToTwoAddr(OutMI, X86::XOR32rr); // MOV32r0 -> XOR32rr
+
+ case X86::MOV32ri64:
+ OutMI.setOpcode(X86::MOV32ri);
break;
- case X86::MOV64r0:
- LowerSubReg32_Op0(OutMI, X86::MOV32r0); // MOV64r0 -> MOV32r0
- LowerUnaryToTwoAddr(OutMI, X86::XOR32rr); // MOV32r0 -> XOR32rr
+
+ // Commute operands to get a smaller encoding by using VEX.R instead of VEX.B
+ // if one of the registers is extended, but other isn't.
+ case X86::VMOVAPDrr:
+ case X86::VMOVAPDYrr:
+ case X86::VMOVAPSrr:
+ case X86::VMOVAPSYrr:
+ case X86::VMOVDQArr:
+ case X86::VMOVDQAYrr:
+ case X86::VMOVDQUrr:
+ case X86::VMOVDQUYrr:
+ case X86::VMOVUPDrr:
+ case X86::VMOVUPDYrr:
+ case X86::VMOVUPSrr:
+ case X86::VMOVUPSYrr: {
+ if (!X86II::isX86_64ExtendedReg(OutMI.getOperand(0).getReg()) &&
+ X86II::isX86_64ExtendedReg(OutMI.getOperand(1).getReg())) {
+ unsigned NewOpc;
+ switch (OutMI.getOpcode()) {
+ default: llvm_unreachable("Invalid opcode");
+ case X86::VMOVAPDrr: NewOpc = X86::VMOVAPDrr_REV; break;
+ case X86::VMOVAPDYrr: NewOpc = X86::VMOVAPDYrr_REV; break;
+ case X86::VMOVAPSrr: NewOpc = X86::VMOVAPSrr_REV; break;
+ case X86::VMOVAPSYrr: NewOpc = X86::VMOVAPSYrr_REV; break;
+ case X86::VMOVDQArr: NewOpc = X86::VMOVDQArr_REV; break;
+ case X86::VMOVDQAYrr: NewOpc = X86::VMOVDQAYrr_REV; break;
+ case X86::VMOVDQUrr: NewOpc = X86::VMOVDQUrr_REV; break;
+ case X86::VMOVDQUYrr: NewOpc = X86::VMOVDQUYrr_REV; break;
+ case X86::VMOVUPDrr: NewOpc = X86::VMOVUPDrr_REV; break;
+ case X86::VMOVUPDYrr: NewOpc = X86::VMOVUPDYrr_REV; break;
+ case X86::VMOVUPSrr: NewOpc = X86::VMOVUPSrr_REV; break;
+ case X86::VMOVUPSYrr: NewOpc = X86::VMOVUPSYrr_REV; break;
+ }
+ OutMI.setOpcode(NewOpc);
+ }
+ break;
+ }
+ case X86::VMOVSDrr:
+ case X86::VMOVSSrr: {
+ if (!X86II::isX86_64ExtendedReg(OutMI.getOperand(0).getReg()) &&
+ X86II::isX86_64ExtendedReg(OutMI.getOperand(2).getReg())) {
+ unsigned NewOpc;
+ switch (OutMI.getOpcode()) {
+ default: llvm_unreachable("Invalid opcode");
+ case X86::VMOVSDrr: NewOpc = X86::VMOVSDrr_REV; break;
+ case X86::VMOVSSrr: NewOpc = X86::VMOVSSrr_REV; break;
+ }
+ OutMI.setOpcode(NewOpc);
+ }
break;
+ }
// TAILJMPr64, CALL64r, CALL64pcrel32 - These instructions have register
// inputs modeled as normal uses instead of implicit uses. As such, truncate
case X86::EH_RETURN:
case X86::EH_RETURN64: {
OutMI = MCInst();
- OutMI.setOpcode(X86::RET);
+ OutMI.setOpcode(getRetOpcode(AsmPrinter.getSubtarget()));
break;
}
case X86::XOR32ri: SimplifyShortImmForm(OutMI, X86::XOR32i32); break;
case X86::XOR64ri32: SimplifyShortImmForm(OutMI, X86::XOR64i32); break;
- case X86::MORESTACK_RET:
- OutMI.setOpcode(X86::RET);
- break;
-
- case X86::MORESTACK_RET_RESTORE_R10: {
- MCInst retInst;
-
- OutMI.setOpcode(X86::MOV64rr);
- OutMI.addOperand(MCOperand::CreateReg(X86::R10));
- OutMI.addOperand(MCOperand::CreateReg(X86::RAX));
-
- retInst.setOpcode(X86::RET);
- AsmPrinter.OutStreamer.EmitInstruction(retInst);
+ // Try to shrink some forms of movsx.
+ case X86::MOVSX16rr8:
+ case X86::MOVSX32rr16:
+ case X86::MOVSX64rr32:
+ SimplifyMOVSX(OutMI);
break;
}
- }
}
-static void LowerTlsAddr(MCStreamer &OutStreamer,
- X86MCInstLower &MCInstLowering,
- const MachineInstr &MI) {
+void X86AsmPrinter::LowerTlsAddr(X86MCInstLower &MCInstLowering,
+ const MachineInstr &MI) {
bool is64Bits = MI.getOpcode() == X86::TLS_addr64 ||
MI.getOpcode() == X86::TLS_base_addr64;
MCContext &context = OutStreamer.getContext();
- if (needsPadding) {
- MCInst prefix;
- prefix.setOpcode(X86::DATA16_PREFIX);
- OutStreamer.EmitInstruction(prefix);
- }
+ if (needsPadding)
+ EmitAndCountInstruction(MCInstBuilder(X86::DATA16_PREFIX));
MCSymbolRefExpr::VariantKind SRVK;
switch (MI.getOpcode()) {
LEA.addOperand(MCOperand::CreateExpr(symRef)); // disp
LEA.addOperand(MCOperand::CreateReg(0)); // seg
}
- OutStreamer.EmitInstruction(LEA);
+ EmitAndCountInstruction(LEA);
if (needsPadding) {
- MCInst prefix;
- prefix.setOpcode(X86::DATA16_PREFIX);
- OutStreamer.EmitInstruction(prefix);
- prefix.setOpcode(X86::DATA16_PREFIX);
- OutStreamer.EmitInstruction(prefix);
- prefix.setOpcode(X86::REX64_PREFIX);
- OutStreamer.EmitInstruction(prefix);
+ EmitAndCountInstruction(MCInstBuilder(X86::DATA16_PREFIX));
+ EmitAndCountInstruction(MCInstBuilder(X86::DATA16_PREFIX));
+ EmitAndCountInstruction(MCInstBuilder(X86::REX64_PREFIX));
}
- MCInst call;
- if (is64Bits)
- call.setOpcode(X86::CALL64pcrel32);
- else
- call.setOpcode(X86::CALLpcrel32);
StringRef name = is64Bits ? "__tls_get_addr" : "___tls_get_addr";
MCSymbol *tlsGetAddr = context.GetOrCreateSymbol(name);
const MCSymbolRefExpr *tlsRef =
MCSymbolRefExpr::VK_PLT,
context);
- call.addOperand(MCOperand::CreateExpr(tlsRef));
- OutStreamer.EmitInstruction(call);
+ EmitAndCountInstruction(MCInstBuilder(is64Bits ? X86::CALL64pcrel32
+ : X86::CALLpcrel32)
+ .addExpr(tlsRef));
+}
+
+/// \brief Emit the optimal amount of multi-byte nops on X86.
+static void EmitNops(MCStreamer &OS, unsigned NumBytes, bool Is64Bit, const MCSubtargetInfo &STI) {
+ // This works only for 64bit. For 32bit we have to do additional checking if
+ // the CPU supports multi-byte nops.
+ assert(Is64Bit && "EmitNops only supports X86-64");
+ while (NumBytes) {
+ unsigned Opc, BaseReg, ScaleVal, IndexReg, Displacement, SegmentReg;
+ Opc = IndexReg = Displacement = SegmentReg = 0;
+ BaseReg = X86::RAX; ScaleVal = 1;
+ switch (NumBytes) {
+ case 0: llvm_unreachable("Zero nops?"); break;
+ case 1: NumBytes -= 1; Opc = X86::NOOP; break;
+ case 2: NumBytes -= 2; Opc = X86::XCHG16ar; break;
+ case 3: NumBytes -= 3; Opc = X86::NOOPL; break;
+ case 4: NumBytes -= 4; Opc = X86::NOOPL; Displacement = 8; break;
+ case 5: NumBytes -= 5; Opc = X86::NOOPL; Displacement = 8;
+ IndexReg = X86::RAX; break;
+ case 6: NumBytes -= 6; Opc = X86::NOOPW; Displacement = 8;
+ IndexReg = X86::RAX; break;
+ case 7: NumBytes -= 7; Opc = X86::NOOPL; Displacement = 512; break;
+ case 8: NumBytes -= 8; Opc = X86::NOOPL; Displacement = 512;
+ IndexReg = X86::RAX; break;
+ case 9: NumBytes -= 9; Opc = X86::NOOPW; Displacement = 512;
+ IndexReg = X86::RAX; break;
+ default: NumBytes -= 10; Opc = X86::NOOPW; Displacement = 512;
+ IndexReg = X86::RAX; SegmentReg = X86::CS; break;
+ }
+
+ unsigned NumPrefixes = std::min(NumBytes, 5U);
+ NumBytes -= NumPrefixes;
+ for (unsigned i = 0; i != NumPrefixes; ++i)
+ OS.EmitBytes("\x66");
+
+ switch (Opc) {
+ default: llvm_unreachable("Unexpected opcode"); break;
+ case X86::NOOP:
+ OS.EmitInstruction(MCInstBuilder(Opc), STI);
+ break;
+ case X86::XCHG16ar:
+ OS.EmitInstruction(MCInstBuilder(Opc).addReg(X86::AX), STI);
+ break;
+ case X86::NOOPL:
+ case X86::NOOPW:
+ OS.EmitInstruction(MCInstBuilder(Opc).addReg(BaseReg)
+ .addImm(ScaleVal).addReg(IndexReg)
+ .addImm(Displacement).addReg(SegmentReg), STI);
+ break;
+ }
+ } // while (NumBytes)
+}
+
+// Lower a stackmap of the form:
+// <id>, <shadowBytes>, ...
+void X86AsmPrinter::LowerSTACKMAP(const MachineInstr &MI) {
+ SMShadowTracker.emitShadowPadding(OutStreamer, getSubtargetInfo());
+ SM.recordStackMap(MI);
+ unsigned NumShadowBytes = MI.getOperand(1).getImm();
+ SMShadowTracker.reset(NumShadowBytes);
+}
+
+// Lower a patchpoint of the form:
+// [<def>], <id>, <numBytes>, <target>, <numArgs>, <cc>, ...
+void X86AsmPrinter::LowerPATCHPOINT(const MachineInstr &MI) {
+ assert(Subtarget->is64Bit() && "Patchpoint currently only supports X86-64");
+
+ SMShadowTracker.emitShadowPadding(OutStreamer, getSubtargetInfo());
+
+ SM.recordPatchPoint(MI);
+
+ PatchPointOpers opers(&MI);
+ unsigned ScratchIdx = opers.getNextScratchIdx();
+ unsigned EncodedBytes = 0;
+ int64_t CallTarget = opers.getMetaOper(PatchPointOpers::TargetPos).getImm();
+ if (CallTarget) {
+ // Emit MOV to materialize the target address and the CALL to target.
+ // This is encoded with 12-13 bytes, depending on which register is used.
+ unsigned ScratchReg = MI.getOperand(ScratchIdx).getReg();
+ if (X86II::isX86_64ExtendedReg(ScratchReg))
+ EncodedBytes = 13;
+ else
+ EncodedBytes = 12;
+ EmitAndCountInstruction(MCInstBuilder(X86::MOV64ri).addReg(ScratchReg)
+ .addImm(CallTarget));
+ EmitAndCountInstruction(MCInstBuilder(X86::CALL64r).addReg(ScratchReg));
+ }
+ // Emit padding.
+ unsigned NumBytes = opers.getMetaOper(PatchPointOpers::NBytesPos).getImm();
+ assert(NumBytes >= EncodedBytes &&
+ "Patchpoint can't request size less than the length of a call.");
+
+ EmitNops(OutStreamer, NumBytes - EncodedBytes, Subtarget->is64Bit(),
+ getSubtargetInfo());
}
void X86AsmPrinter::EmitInstruction(const MachineInstr *MI) {
- X86MCInstLower MCInstLowering(Mang, *MF, *this);
+ X86MCInstLower MCInstLowering(*MF, *this);
+ const X86RegisterInfo *RI =
+ static_cast<const X86RegisterInfo *>(TM.getRegisterInfo());
+
switch (MI->getOpcode()) {
case TargetOpcode::DBG_VALUE:
- if (isVerbose() && OutStreamer.hasRawTextSupport()) {
- std::string TmpStr;
- raw_string_ostream OS(TmpStr);
- PrintDebugValueComment(MI, OS);
- OutStreamer.EmitRawText(StringRef(OS.str()));
- }
- return;
+ llvm_unreachable("Should be handled target independently");
// Emit nothing here but a comment if we can.
case X86::Int_MemBarrier:
- if (OutStreamer.hasRawTextSupport())
- OutStreamer.EmitRawText(StringRef("\t#MEMBARRIER"));
+ OutStreamer.emitRawComment("MEMBARRIER");
return;
case X86::TLS_addr64:
case X86::TLS_base_addr32:
case X86::TLS_base_addr64:
- return LowerTlsAddr(OutStreamer, MCInstLowering, *MI);
+ return LowerTlsAddr(MCInstLowering, *MI);
case X86::MOVPC32r: {
- MCInst TmpInst;
// This is a pseudo op for a two instruction sequence with a label, which
// looks like:
// call "L1$pb"
// Emit the call.
MCSymbol *PICBase = MF->getPICBaseSymbol();
- TmpInst.setOpcode(X86::CALLpcrel32);
// FIXME: We would like an efficient form for this, so we don't have to do a
// lot of extra uniquing.
- TmpInst.addOperand(MCOperand::CreateExpr(MCSymbolRefExpr::Create(PICBase,
- OutContext)));
- OutStreamer.EmitInstruction(TmpInst);
+ EmitAndCountInstruction(MCInstBuilder(X86::CALLpcrel32)
+ .addExpr(MCSymbolRefExpr::Create(PICBase, OutContext)));
// Emit the label.
OutStreamer.EmitLabel(PICBase);
// popl $reg
- TmpInst.setOpcode(X86::POP32r);
- TmpInst.getOperand(0) = MCOperand::CreateReg(MI->getOperand(0).getReg());
- OutStreamer.EmitInstruction(TmpInst);
+ EmitAndCountInstruction(MCInstBuilder(X86::POP32r)
+ .addReg(MI->getOperand(0).getReg()));
return;
}
DotExpr = MCBinaryExpr::CreateAdd(MCSymbolRefExpr::Create(OpSym,OutContext),
DotExpr, OutContext);
- MCInst TmpInst;
- TmpInst.setOpcode(X86::ADD32ri);
- TmpInst.addOperand(MCOperand::CreateReg(MI->getOperand(0).getReg()));
- TmpInst.addOperand(MCOperand::CreateReg(MI->getOperand(1).getReg()));
- TmpInst.addOperand(MCOperand::CreateExpr(DotExpr));
- OutStreamer.EmitInstruction(TmpInst);
+ EmitAndCountInstruction(MCInstBuilder(X86::ADD32ri)
+ .addReg(MI->getOperand(0).getReg())
+ .addReg(MI->getOperand(1).getReg())
+ .addExpr(DotExpr));
return;
}
+
+ case TargetOpcode::STACKMAP:
+ return LowerSTACKMAP(*MI);
+
+ case TargetOpcode::PATCHPOINT:
+ return LowerPATCHPOINT(*MI);
+
+ case X86::MORESTACK_RET:
+ EmitAndCountInstruction(MCInstBuilder(getRetOpcode(*Subtarget)));
+ return;
+
+ case X86::MORESTACK_RET_RESTORE_R10:
+ // Return, then restore R10.
+ EmitAndCountInstruction(MCInstBuilder(getRetOpcode(*Subtarget)));
+ EmitAndCountInstruction(MCInstBuilder(X86::MOV64rr)
+ .addReg(X86::R10)
+ .addReg(X86::RAX));
+ return;
+
+ case X86::SEH_PushReg:
+ OutStreamer.EmitWinCFIPushReg(RI->getSEHRegNum(MI->getOperand(0).getImm()));
+ return;
+
+ case X86::SEH_SaveReg:
+ OutStreamer.EmitWinCFISaveReg(RI->getSEHRegNum(MI->getOperand(0).getImm()),
+ MI->getOperand(1).getImm());
+ return;
+
+ case X86::SEH_SaveXMM:
+ OutStreamer.EmitWinCFISaveXMM(RI->getSEHRegNum(MI->getOperand(0).getImm()),
+ MI->getOperand(1).getImm());
+ return;
+
+ case X86::SEH_StackAlloc:
+ OutStreamer.EmitWinCFIAllocStack(MI->getOperand(0).getImm());
+ return;
+
+ case X86::SEH_SetFrame:
+ OutStreamer.EmitWinCFISetFrame(RI->getSEHRegNum(MI->getOperand(0).getImm()),
+ MI->getOperand(1).getImm());
+ return;
+
+ case X86::SEH_PushFrame:
+ OutStreamer.EmitWinCFIPushFrame(MI->getOperand(0).getImm());
+ return;
+
+ case X86::SEH_EndPrologue:
+ OutStreamer.EmitWinCFIEndProlog();
+ return;
}
MCInst TmpInst;
MCInstLowering.Lower(MI, TmpInst);
- OutStreamer.EmitInstruction(TmpInst);
+ EmitAndCountInstruction(TmpInst);
}
projects / oota-llvm.git / blobdiff