#include "X86MachineFunctionInfo.h"
#include "X86Subtarget.h"
#include "X86TargetMachine.h"
-#include "llvm/Constants.h"
-#include "llvm/Function.h"
-#include "llvm/Type.h"
-#include "llvm/CodeGen/ValueTypes.h"
-#include "llvm/CodeGen/MachineInstrBuilder.h"
+#include "llvm/ADT/BitVector.h"
+#include "llvm/ADT/STLExtras.h"
+#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
-#include "llvm/CodeGen/MachineFrameInfo.h"
+#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/MachineModuleInfo.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
+#include "llvm/CodeGen/ValueTypes.h"
+#include "llvm/IR/Constants.h"
+#include "llvm/IR/Function.h"
+#include "llvm/IR/Type.h"
#include "llvm/MC/MCAsmInfo.h"
+#include "llvm/Support/CommandLine.h"
+#include "llvm/Support/ErrorHandling.h"
#include "llvm/Target/TargetFrameLowering.h"
#include "llvm/Target/TargetInstrInfo.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Target/TargetOptions.h"
-#include "llvm/ADT/BitVector.h"
-#include "llvm/ADT/STLExtras.h"
-#include "llvm/Support/ErrorHandling.h"
-#include "llvm/Support/CommandLine.h"
#define GET_REGINFO_TARGET_DESC
#include "X86GenRegisterInfo.inc"
" needed for the function."),
cl::init(false), cl::Hidden);
-cl::opt<bool>
+static cl::opt<bool>
EnableBasePointer("x86-use-base-pointer", cl::Hidden, cl::init(true),
cl::desc("Enable use of a base pointer for complex stack frames"));
-X86RegisterInfo::X86RegisterInfo(X86TargetMachine &tm,
- const TargetInstrInfo &tii)
- : X86GenRegisterInfo(tm.getSubtarget<X86Subtarget>().is64Bit()
- ? X86::RIP : X86::EIP,
+X86RegisterInfo::X86RegisterInfo(X86TargetMachine &tm)
+ : X86GenRegisterInfo((tm.getSubtarget<X86Subtarget>().is64Bit()
+ ? X86::RIP : X86::EIP),
X86_MC::getDwarfRegFlavour(tm.getTargetTriple(), false),
- X86_MC::getDwarfRegFlavour(tm.getTargetTriple(), true)),
- TM(tm), TII(tii) {
+ X86_MC::getDwarfRegFlavour(tm.getTargetTriple(), true),
+ (tm.getSubtarget<X86Subtarget>().is64Bit()
+ ? X86::RIP : X86::EIP)),
+ TM(tm) {
X86_MC::InitLLVM2SEHRegisterMapping(this);
// Cache some information.
const TargetRegisterClass *
X86RegisterInfo::getPointerRegClass(const MachineFunction &MF, unsigned Kind)
const {
+ const X86Subtarget &Subtarget = TM.getSubtarget<X86Subtarget>();
switch (Kind) {
default: llvm_unreachable("Unexpected Kind in getPointerRegClass!");
case 0: // Normal GPRs.
- if (TM.getSubtarget<X86Subtarget>().is64Bit())
+ if (Subtarget.isTarget64BitLP64())
return &X86::GR64RegClass;
return &X86::GR32RegClass;
case 1: // Normal GPRs except the stack pointer (for encoding reasons).
- if (TM.getSubtarget<X86Subtarget>().is64Bit())
+ if (Subtarget.isTarget64BitLP64())
return &X86::GR64_NOSPRegClass;
return &X86::GR32_NOSPRegClass;
case 2: // Available for tailcall (not callee-saved GPRs).
- if (TM.getSubtarget<X86Subtarget>().isTargetWin64())
+ if (Subtarget.isTargetWin64())
return &X86::GR64_TCW64RegClass;
- if (TM.getSubtarget<X86Subtarget>().is64Bit())
+ else if (Subtarget.is64Bit())
return &X86::GR64_TCRegClass;
const Function *F = MF.getFunction();
const uint16_t *
X86RegisterInfo::getCalleeSavedRegs(const MachineFunction *MF) const {
- bool callsEHReturn = false;
- bool ghcCall = false;
- bool oclBiCall = false;
- bool hipeCall = false;
- bool HasAVX = TM.getSubtarget<X86Subtarget>().hasAVX();
-
- if (MF) {
- callsEHReturn = MF->getMMI().callsEHReturn();
- const Function *F = MF->getFunction();
- ghcCall = (F ? F->getCallingConv() == CallingConv::GHC : false);
- oclBiCall = (F ? F->getCallingConv() == CallingConv::Intel_OCL_BI : false);
- hipeCall = (F ? F->getCallingConv() == CallingConv::HiPE : false);
- }
-
- if (ghcCall || hipeCall)
+ switch (MF->getFunction()->getCallingConv()) {
+ case CallingConv::GHC:
+ case CallingConv::HiPE:
return CSR_NoRegs_SaveList;
- if (oclBiCall) {
+
+ case CallingConv::Intel_OCL_BI: {
+ bool HasAVX = TM.getSubtarget<X86Subtarget>().hasAVX();
if (HasAVX && IsWin64)
- return CSR_Win64_Intel_OCL_BI_AVX_SaveList;
+ return CSR_Win64_Intel_OCL_BI_AVX_SaveList;
if (HasAVX && Is64Bit)
- return CSR_64_Intel_OCL_BI_AVX_SaveList;
+ return CSR_64_Intel_OCL_BI_AVX_SaveList;
if (!HasAVX && !IsWin64 && Is64Bit)
- return CSR_64_Intel_OCL_BI_SaveList;
+ return CSR_64_Intel_OCL_BI_SaveList;
+ break;
+ }
+
+ case CallingConv::Cold:
+ if (Is64Bit)
+ return CSR_MostRegs_64_SaveList;
+ break;
+
+ default:
+ break;
}
+
+ bool CallsEHReturn = MF->getMMI().callsEHReturn();
if (Is64Bit) {
if (IsWin64)
return CSR_Win64_SaveList;
- if (callsEHReturn)
+ if (CallsEHReturn)
return CSR_64EHRet_SaveList;
return CSR_64_SaveList;
}
- if (callsEHReturn)
+ if (CallsEHReturn)
return CSR_32EHRet_SaveList;
return CSR_32_SaveList;
}
return CSR_NoRegs_RegMask;
if (!Is64Bit)
return CSR_32_RegMask;
+ if (CC == CallingConv::Cold)
+ return CSR_MostRegs_64_RegMask;
if (IsWin64)
return CSR_Win64_RegMask;
return CSR_64_RegMask;
const TargetFrameLowering *TFI = MF.getTarget().getFrameLowering();
// Set the stack-pointer register and its aliases as reserved.
- Reserved.set(X86::RSP);
- for (MCSubRegIterator I(X86::RSP, this); I.isValid(); ++I)
+ for (MCSubRegIterator I(X86::RSP, this, /*IncludeSelf=*/true); I.isValid();
+ ++I)
Reserved.set(*I);
// Set the instruction pointer register and its aliases as reserved.
- Reserved.set(X86::RIP);
- for (MCSubRegIterator I(X86::RIP, this); I.isValid(); ++I)
+ for (MCSubRegIterator I(X86::RIP, this, /*IncludeSelf=*/true); I.isValid();
+ ++I)
Reserved.set(*I);
// Set the frame-pointer register and its aliases as reserved if needed.
if (TFI->hasFP(MF)) {
- Reserved.set(X86::RBP);
- for (MCSubRegIterator I(X86::RBP, this); I.isValid(); ++I)
+ for (MCSubRegIterator I(X86::RBP, this, /*IncludeSelf=*/true); I.isValid();
+ ++I)
Reserved.set(*I);
}
"Stack realignment in presence of dynamic allocas is not supported with"
"this calling convention.");
- Reserved.set(getBaseRegister());
- for (MCSubRegIterator I(getBaseRegister(), this); I.isValid(); ++I)
+ for (MCSubRegIterator I(getBaseRegister(), this, /*IncludeSelf=*/true);
+ I.isValid(); ++I)
Reserved.set(*I);
}
Reserved.set(*AI);
// XMM8, XMM9, ...
- assert(X86::XMM15 == X86::XMM8+7);
- for (MCRegAliasIterator AI(X86::XMM8 + n, this, true); AI.isValid(); ++AI)
+ static const uint16_t XMMReg[] = {
+ X86::XMM8, X86::XMM9, X86::XMM10, X86::XMM11,
+ X86::XMM12, X86::XMM13, X86::XMM14, X86::XMM15
+ };
+ for (MCRegAliasIterator AI(XMMReg[n], this, true); AI.isValid(); ++AI)
Reserved.set(*AI);
}
}
// When we need stack realignment and there are dynamic allocas, we can't
// reference off of the stack pointer, so we reserve a base pointer.
- if (needsStackRealignment(MF) && MFI->hasVarSizedObjects())
+ //
+ // This is also true if the function contain MS-style inline assembly. We
+ // do this because if any stack changes occur in the inline assembly, e.g.,
+ // "pusha", then any C local variable or C argument references in the
+ // inline assembly will be wrong because the SP is not properly tracked.
+ if ((needsStackRealignment(MF) && MFI->hasVarSizedObjects()) ||
+ MF.hasMSInlineAsm())
return true;
return false;
unsigned StackAlign = TM.getFrameLowering()->getStackAlignment();
bool requiresRealignment =
((MFI->getMaxAlignment() > StackAlign) ||
- F->getFnAttributes().hasAttribute(Attributes::StackAlignment));
+ F->getAttributes().hasAttribute(AttributeSet::FunctionIndex,
+ Attribute::StackAlignment));
// If we've requested that we force align the stack do so now.
if (ForceStackAlign)
return false;
}
-static unsigned getSUBriOpcode(unsigned is64Bit, int64_t Imm) {
- if (is64Bit) {
- if (isInt<8>(Imm))
- return X86::SUB64ri8;
- return X86::SUB64ri32;
- } else {
- if (isInt<8>(Imm))
- return X86::SUB32ri8;
- return X86::SUB32ri;
- }
-}
-
-static unsigned getADDriOpcode(unsigned is64Bit, int64_t Imm) {
- if (is64Bit) {
- if (isInt<8>(Imm))
- return X86::ADD64ri8;
- return X86::ADD64ri32;
- } else {
- if (isInt<8>(Imm))
- return X86::ADD32ri8;
- return X86::ADD32ri;
- }
-}
-
-void X86RegisterInfo::
-eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
- MachineBasicBlock::iterator I) const {
- const TargetFrameLowering *TFI = MF.getTarget().getFrameLowering();
- bool reseveCallFrame = TFI->hasReservedCallFrame(MF);
- int Opcode = I->getOpcode();
- bool isDestroy = Opcode == TII.getCallFrameDestroyOpcode();
- DebugLoc DL = I->getDebugLoc();
- uint64_t Amount = !reseveCallFrame ? I->getOperand(0).getImm() : 0;
- uint64_t CalleeAmt = isDestroy ? I->getOperand(1).getImm() : 0;
- I = MBB.erase(I);
-
- if (!reseveCallFrame) {
- // If the stack pointer can be changed after prologue, turn the
- // adjcallstackup instruction into a 'sub ESP, <amt>' and the
- // adjcallstackdown instruction into 'add ESP, <amt>'
- // TODO: consider using push / pop instead of sub + store / add
- if (Amount == 0)
- return;
-
- // We need to keep the stack aligned properly. To do this, we round the
- // amount of space needed for the outgoing arguments up to the next
- // alignment boundary.
- unsigned StackAlign = TM.getFrameLowering()->getStackAlignment();
- Amount = (Amount + StackAlign - 1) / StackAlign * StackAlign;
-
- MachineInstr *New = 0;
- if (Opcode == TII.getCallFrameSetupOpcode()) {
- New = BuildMI(MF, DL, TII.get(getSUBriOpcode(Is64Bit, Amount)),
- StackPtr)
- .addReg(StackPtr)
- .addImm(Amount);
- } else {
- assert(Opcode == TII.getCallFrameDestroyOpcode());
-
- // Factor out the amount the callee already popped.
- Amount -= CalleeAmt;
-
- if (Amount) {
- unsigned Opc = getADDriOpcode(Is64Bit, Amount);
- New = BuildMI(MF, DL, TII.get(Opc), StackPtr)
- .addReg(StackPtr).addImm(Amount);
- }
- }
-
- if (New) {
- // The EFLAGS implicit def is dead.
- New->getOperand(3).setIsDead();
-
- // Replace the pseudo instruction with a new instruction.
- MBB.insert(I, New);
- }
-
- return;
- }
-
- if (Opcode == TII.getCallFrameDestroyOpcode() && CalleeAmt) {
- // If we are performing frame pointer elimination and if the callee pops
- // something off the stack pointer, add it back. We do this until we have
- // more advanced stack pointer tracking ability.
- unsigned Opc = getSUBriOpcode(Is64Bit, CalleeAmt);
- MachineInstr *New = BuildMI(MF, DL, TII.get(Opc), StackPtr)
- .addReg(StackPtr).addImm(CalleeAmt);
-
- // The EFLAGS implicit def is dead.
- New->getOperand(3).setIsDead();
-
- // We are not tracking the stack pointer adjustment by the callee, so make
- // sure we restore the stack pointer immediately after the call, there may
- // be spill code inserted between the CALL and ADJCALLSTACKUP instructions.
- MachineBasicBlock::iterator B = MBB.begin();
- while (I != B && !llvm::prior(I)->isCall())
- --I;
- MBB.insert(I, New);
- }
-}
-
void
X86RegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II,
- int SPAdj, RegScavenger *RS) const {
+ int SPAdj, unsigned FIOperandNum,
+ RegScavenger *RS) const {
assert(SPAdj == 0 && "Unexpected");
- unsigned i = 0;
MachineInstr &MI = *II;
MachineFunction &MF = *MI.getParent()->getParent();
const TargetFrameLowering *TFI = MF.getTarget().getFrameLowering();
-
- while (!MI.getOperand(i).isFI()) {
- ++i;
- assert(i < MI.getNumOperands() && "Instr doesn't have FrameIndex operand!");
- }
-
- int FrameIndex = MI.getOperand(i).getIndex();
+ int FrameIndex = MI.getOperand(FIOperandNum).getIndex();
unsigned BasePtr;
unsigned Opc = MI.getOpcode();
// This must be part of a four operand memory reference. Replace the
// FrameIndex with base register with EBP. Add an offset to the offset.
- MI.getOperand(i).ChangeToRegister(BasePtr, false);
+ MI.getOperand(FIOperandNum).ChangeToRegister(BasePtr, false);
// Now add the frame object offset to the offset from EBP.
int FIOffset;
} else
FIOffset = TFI->getFrameIndexOffset(MF, FrameIndex);
- if (MI.getOperand(i+3).isImm()) {
+ if (MI.getOperand(FIOperandNum+3).isImm()) {
// Offset is a 32-bit integer.
- int Imm = (int)(MI.getOperand(i + 3).getImm());
+ int Imm = (int)(MI.getOperand(FIOperandNum + 3).getImm());
int Offset = FIOffset + Imm;
assert((!Is64Bit || isInt<32>((long long)FIOffset + Imm)) &&
"Requesting 64-bit offset in 32-bit immediate!");
- MI.getOperand(i + 3).ChangeToImmediate(Offset);
+ MI.getOperand(FIOperandNum + 3).ChangeToImmediate(Offset);
} else {
// Offset is symbolic. This is extremely rare.
- uint64_t Offset = FIOffset + (uint64_t)MI.getOperand(i+3).getOffset();
- MI.getOperand(i+3).setOffset(Offset);
+ uint64_t Offset = FIOffset +
+ (uint64_t)MI.getOperand(FIOperandNum+3).getOffset();
+ MI.getOperand(FIOperandNum + 3).setOffset(Offset);
}
}
case MVT::i8:
if (High) {
switch (Reg) {
- default: return getX86SubSuperRegister(Reg, MVT::i64, High);
+ default: return getX86SubSuperRegister(Reg, MVT::i64);
+ case X86::SIL: case X86::SI: case X86::ESI: case X86::RSI:
+ return X86::SI;
+ case X86::DIL: case X86::DI: case X86::EDI: case X86::RDI:
+ return X86::DI;
+ case X86::BPL: case X86::BP: case X86::EBP: case X86::RBP:
+ return X86::BP;
+ case X86::SPL: case X86::SP: case X86::ESP: case X86::RSP:
+ return X86::SP;
case X86::AH: case X86::AL: case X86::AX: case X86::EAX: case X86::RAX:
return X86::AH;
case X86::DH: case X86::DL: case X86::DX: case X86::EDX: case X86::RDX:
return X86::R15D;
}
case MVT::i64:
- // For 64-bit mode if we've requested a "high" register and the
- // Q or r constraints we want one of these high registers or
- // just the register name otherwise.
- if (High) {
- switch (Reg) {
- case X86::SIL: case X86::SI: case X86::ESI: case X86::RSI:
- return X86::SI;
- case X86::DIL: case X86::DI: case X86::EDI: case X86::RDI:
- return X86::DI;
- case X86::BPL: case X86::BP: case X86::EBP: case X86::RBP:
- return X86::BP;
- case X86::SPL: case X86::SP: case X86::ESP: case X86::RSP:
- return X86::SP;
- // Fallthrough.
- }
- }
switch (Reg) {
default: llvm_unreachable("Unexpected register");
case X86::AH: case X86::AL: case X86::AX: case X86::EAX: case X86::RAX:
}
}
}
-
-namespace {
- struct MSAH : public MachineFunctionPass {
- static char ID;
- MSAH() : MachineFunctionPass(ID) {}
-
- virtual bool runOnMachineFunction(MachineFunction &MF) {
- const X86TargetMachine *TM =
- static_cast<const X86TargetMachine *>(&MF.getTarget());
- const TargetFrameLowering *TFI = TM->getFrameLowering();
- MachineRegisterInfo &RI = MF.getRegInfo();
- X86MachineFunctionInfo *FuncInfo = MF.getInfo<X86MachineFunctionInfo>();
- unsigned StackAlignment = TFI->getStackAlignment();
-
- // Be over-conservative: scan over all vreg defs and find whether vector
- // registers are used. If yes, there is a possibility that vector register
- // will be spilled and thus require dynamic stack realignment.
- for (unsigned i = 0, e = RI.getNumVirtRegs(); i != e; ++i) {
- unsigned Reg = TargetRegisterInfo::index2VirtReg(i);
- if (RI.getRegClass(Reg)->getAlignment() > StackAlignment) {
- FuncInfo->setForceFramePointer(true);
- return true;
- }
- }
- // Nothing to do
- return false;
- }
-
- virtual const char *getPassName() const {
- return "X86 Maximal Stack Alignment Check";
- }
-
- virtual void getAnalysisUsage(AnalysisUsage &AU) const {
- AU.setPreservesCFG();
- MachineFunctionPass::getAnalysisUsage(AU);
- }
- };
-
- char MSAH::ID = 0;
-}
-
-FunctionPass*
-llvm::createX86MaxStackAlignmentHeuristicPass() { return new MSAH(); }
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