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Re-land "[X86] Cache variables that only depend on the subtarget" 

Re-instates r239949 without accidentally flipping the sense of UseLEA.

llvm-svn: 239950
This commit is contained in:
Reid Kleckner 2015-06-17 21:50:02 +00:00
parent 09543c2998
commit f9977bfb23
5 changed files with 64 additions and 89 deletions
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8
llvm/lib/Target/X86/X86ExpandPseudo.cpp
View File

@ -89,14 +89,14 @@ bool X86ExpandPseudo::ExpandMI(MachineBasicBlock &MBB,
const bool Uses64BitFramePtr =
STI->isTarget64BitLP64() || STI->isTargetNaCl64();
// Check if we should use LEA for SP.
const X86FrameLowering *TFI = STI->getFrameLowering();
bool UseLEAForSP = STI->useLeaForSP() &&
X86FL->canUseLEAForSPInEpilogue(*MBB.getParent());
unsigned StackPtr = TRI->getStackRegister();
// Check for possible merge with preceding ADD instruction.
StackAdj += X86FrameLowering::mergeSPUpdates(MBB, MBBI, StackPtr, true);
X86FrameLowering::emitSPUpdate(MBB, MBBI, StackPtr, StackAdj, Is64Bit,
Uses64BitFramePtr, UseLEAForSP, *TII,
*TRI);
StackAdj += TFI->mergeSPUpdates(MBB, MBBI, StackPtr, true);
TFI->emitSPUpdate(MBB, MBBI, StackPtr, StackAdj, Is64Bit,
Uses64BitFramePtr, UseLEAForSP, *TII, *TRI);
}
// Jump to label or value in register.

93
llvm/lib/Target/X86/X86FrameLowering.cpp
View File

@ -37,6 +37,19 @@ using namespace llvm;
// FIXME: completely move here.
extern cl::opt<bool> ForceStackAlign;
X86FrameLowering::X86FrameLowering(const X86Subtarget &STI,
unsigned StackAlignOverride)
: TargetFrameLowering(StackGrowsDown, StackAlignOverride,
STI.is64Bit() ? -8 : -4),
STI(STI), TII(*STI.getInstrInfo()), RegInfo(STI.getRegisterInfo()) {
// Cache a bunch of frame-related predicates for this subtarget.
SlotSize = RegInfo->getSlotSize();
Is64Bit = STI.is64Bit();
IsLP64 = STI.isTarget64BitLP64();
// standard x86_64 and NaCl use 64-bit frame/stack pointers, x32 - 32-bit.
Uses64BitFramePtr = STI.isTarget64BitLP64() || STI.isTargetNaCl64();
}
bool X86FrameLowering::hasReservedCallFrame(const MachineFunction &MF) const {
return !MF.getFrameInfo()->hasVarSizedObjects() &&
!MF.getInfo<X86MachineFunctionInfo>()->getHasPushSequences();
@ -48,11 +61,9 @@ bool X86FrameLowering::hasReservedCallFrame(const MachineFunction &MF) const {
/// Use a more nuanced condition.
bool
X86FrameLowering::canSimplifyCallFramePseudos(const MachineFunction &MF) const {
const X86RegisterInfo *TRI = static_cast<const X86RegisterInfo *>
(MF.getSubtarget().getRegisterInfo());
return hasReservedCallFrame(MF) ||
(hasFP(MF) && !TRI->needsStackRealignment(MF))
|| TRI->hasBasePointer(MF);
(hasFP(MF) && !RegInfo->needsStackRealignment(MF)) ||
RegInfo->hasBasePointer(MF);
}
// needsFrameIndexResolution - Do we need to perform FI resolution for
@ -74,7 +85,6 @@ X86FrameLowering::needsFrameIndexResolution(const MachineFunction &MF) const {
bool X86FrameLowering::hasFP(const MachineFunction &MF) const {
const MachineFrameInfo *MFI = MF.getFrameInfo();
const MachineModuleInfo &MMI = MF.getMMI();
const TargetRegisterInfo *RegInfo = MF.getSubtarget().getRegisterInfo();
return (MF.getTarget().Options.DisableFramePointerElim(MF) ||
RegInfo->needsStackRealignment(MF) ||
@ -210,7 +220,7 @@ void X86FrameLowering::emitSPUpdate(MachineBasicBlock &MBB,
unsigned StackPtr, int64_t NumBytes,
bool Is64BitTarget, bool Is64BitStackPtr,
bool UseLEA, const TargetInstrInfo &TII,
const TargetRegisterInfo &TRI) {
const TargetRegisterInfo &TRI) const {
bool isSub = NumBytes < 0;
uint64_t Offset = isSub ? -NumBytes : NumBytes;
unsigned Opc;
@ -316,7 +326,7 @@ void mergeSPUpdatesUp(MachineBasicBlock &MBB, MachineBasicBlock::iterator &MBBI,
int X86FrameLowering::mergeSPUpdates(MachineBasicBlock &MBB,
MachineBasicBlock::iterator &MBBI,
unsigned StackPtr,
bool doMergeWithPrevious) {
bool doMergeWithPrevious) const {
if ((doMergeWithPrevious && MBBI == MBB.begin()) ||
(!doMergeWithPrevious && MBBI == MBB.end()))
return 0;
@ -363,7 +373,6 @@ X86FrameLowering::emitCalleeSavedFrameMoves(MachineBasicBlock &MBB,
MachineFrameInfo *MFI = MF.getFrameInfo();
MachineModuleInfo &MMI = MF.getMMI();
const MCRegisterInfo *MRI = MMI.getContext().getRegisterInfo();
const TargetInstrInfo &TII = *MF.getSubtarget().getInstrInfo();
// Add callee saved registers to move list.
const std::vector<CalleeSavedInfo> &CSI = MFI->getCalleeSavedInfo();
@ -401,10 +410,7 @@ static bool usesTheStack(const MachineFunction &MF) {
void X86FrameLowering::emitStackProbeCall(MachineFunction &MF,
MachineBasicBlock &MBB,
MachineBasicBlock::iterator MBBI,
DebugLoc DL) {
const X86Subtarget &STI = MF.getSubtarget<X86Subtarget>();
const TargetInstrInfo &TII = *STI.getInstrInfo();
bool Is64Bit = STI.is64Bit();
DebugLoc DL) const {
bool IsLargeCodeModel = MF.getTarget().getCodeModel() == CodeModel::Large;
unsigned CallOp;
@ -470,13 +476,10 @@ static unsigned calculateSetFPREG(uint64_t SPAdjust) {
// info, we need to know the ABI stack alignment as well in case we
// have a call out. Otherwise just make sure we have some alignment - we'll
// go with the minimum SlotSize.
static uint64_t calculateMaxStackAlign(const MachineFunction &MF) {
uint64_t X86FrameLowering::calculateMaxStackAlign(const MachineFunction &MF) const {
const MachineFrameInfo *MFI = MF.getFrameInfo();
uint64_t MaxAlign = MFI->getMaxAlignment(); // Desired stack alignment.
const X86Subtarget &STI = MF.getSubtarget<X86Subtarget>();
const X86RegisterInfo *RegInfo = STI.getRegisterInfo();
unsigned SlotSize = RegInfo->getSlotSize();
unsigned StackAlign = STI.getFrameLowering()->getStackAlignment();
unsigned StackAlign = getStackAlignment();
if (ForceStackAlign) {
if (MFI->hasCalls())
MaxAlign = (StackAlign > MaxAlign) ? StackAlign : MaxAlign;
@ -572,28 +575,22 @@ static uint64_t calculateMaxStackAlign(const MachineFunction &MF) {
void X86FrameLowering::emitPrologue(MachineFunction &MF,
MachineBasicBlock &MBB) const {
assert(&STI == &MF.getSubtarget<X86Subtarget>() &&
"MF used frame lowering for wrong subtarget");
MachineBasicBlock::iterator MBBI = MBB.begin();
MachineFrameInfo *MFI = MF.getFrameInfo();
const Function *Fn = MF.getFunction();
const X86Subtarget &STI = MF.getSubtarget<X86Subtarget>();
const X86RegisterInfo *RegInfo = STI.getRegisterInfo();
const TargetInstrInfo &TII = *STI.getInstrInfo();
MachineModuleInfo &MMI = MF.getMMI();
X86MachineFunctionInfo *X86FI = MF.getInfo<X86MachineFunctionInfo>();
uint64_t MaxAlign = calculateMaxStackAlign(MF); // Desired stack alignment.
uint64_t StackSize = MFI->getStackSize(); // Number of bytes to allocate.
bool HasFP = hasFP(MF);
bool Is64Bit = STI.is64Bit();
// standard x86_64 and NaCl use 64-bit frame/stack pointers, x32 - 32-bit.
const bool Uses64BitFramePtr = STI.isTarget64BitLP64() || STI.isTargetNaCl64();
bool IsWin64CC = STI.isCallingConvWin64(Fn->getCallingConv());
// Not necessarily synonymous with IsWin64CC.
bool IsWin64Prologue = MF.getTarget().getMCAsmInfo()->usesWindowsCFI();
bool NeedsWinCFI = IsWin64Prologue && Fn->needsUnwindTableEntry();
bool NeedsDwarfCFI =
!IsWin64Prologue && (MMI.hasDebugInfo() || Fn->needsUnwindTableEntry());
bool UseLEA = STI.useLeaForSP();
unsigned SlotSize = RegInfo->getSlotSize();
unsigned FramePtr = RegInfo->getFrameRegister(MF);
const unsigned MachineFramePtr =
STI.isTarget64BitILP32()
@ -997,18 +994,12 @@ void X86FrameLowering::emitEpilogue(MachineFunction &MF,
MachineBasicBlock &MBB) const {
const MachineFrameInfo *MFI = MF.getFrameInfo();
X86MachineFunctionInfo *X86FI = MF.getInfo<X86MachineFunctionInfo>();
const X86Subtarget &STI = MF.getSubtarget<X86Subtarget>();
const X86RegisterInfo *RegInfo = STI.getRegisterInfo();
const TargetInstrInfo &TII = *STI.getInstrInfo();
MachineBasicBlock::iterator MBBI = MBB.getFirstTerminator();
DebugLoc DL;
if (MBBI != MBB.end())
DL = MBBI->getDebugLoc();
bool Is64Bit = STI.is64Bit();
// standard x86_64 and NaCl use 64-bit frame/stack pointers, x32 - 32-bit.
const bool Uses64BitFramePtr = STI.isTarget64BitLP64() || STI.isTargetNaCl64();
const bool Is64BitILP32 = STI.isTarget64BitILP32();
unsigned SlotSize = RegInfo->getSlotSize();
unsigned FramePtr = RegInfo->getFrameRegister(MF);
unsigned MachineFramePtr =
Is64BitILP32 ? getX86SubSuperRegister(FramePtr, MVT::i64, false)
@ -1024,7 +1015,7 @@ void X86FrameLowering::emitEpilogue(MachineFunction &MF,
// a ADD that will redefine the eflags and break the condition.
// Alternatively, we could move the ADD, but this may not be possible
// and is an optimization anyway.
if (UseLEAForSP && !MF.getSubtarget<X86Subtarget>().useLeaForSP())
if (UseLEAForSP && !STI.useLeaForSP())
UseLEAForSP = terminatorsNeedFlagsAsInput(MBB);
// If that assert breaks, that means we do not do the right thing
// in canUseAsEpilogue.
@ -1135,8 +1126,6 @@ void X86FrameLowering::emitEpilogue(MachineFunction &MF,
int X86FrameLowering::getFrameIndexOffset(const MachineFunction &MF,
int FI) const {
const X86RegisterInfo *RegInfo =
MF.getSubtarget<X86Subtarget>().getRegisterInfo();
const MachineFrameInfo *MFI = MF.getFrameInfo();
// Offset will hold the offset from the stack pointer at function entry to the
// object.
@ -1146,7 +1135,6 @@ int X86FrameLowering::getFrameIndexOffset(const MachineFunction &MF,
const X86MachineFunctionInfo *X86FI = MF.getInfo<X86MachineFunctionInfo>();
unsigned CSSize = X86FI->getCalleeSavedFrameSize();
uint64_t StackSize = MFI->getStackSize();
unsigned SlotSize = RegInfo->getSlotSize();
bool HasFP = hasFP(MF);
bool IsWin64Prologue = MF.getTarget().getMCAsmInfo()->usesWindowsCFI();
int64_t FPDelta = 0;
@ -1211,8 +1199,6 @@ int X86FrameLowering::getFrameIndexOffset(const MachineFunction &MF,
int X86FrameLowering::getFrameIndexReference(const MachineFunction &MF, int FI,
unsigned &FrameReg) const {
const X86RegisterInfo *RegInfo =
MF.getSubtarget<X86Subtarget>().getRegisterInfo();
// We can't calculate offset from frame pointer if the stack is realigned,
// so enforce usage of stack/base pointer. The base pointer is used when we
// have dynamic allocas in addition to dynamic realignment.
@ -1232,8 +1218,6 @@ int X86FrameLowering::getFrameIndexOffsetFromSP(const MachineFunction &MF, int F
const uint64_t StackSize = MFI->getStackSize();
{
#ifndef NDEBUG
const X86RegisterInfo *RegInfo =
MF.getSubtarget<X86Subtarget>().getRegisterInfo();
// Note: LLVM arranges the stack as:
// Args > Saved RetPC (<--FP) > CSRs > dynamic alignment (<--BP)
// > "Stack Slots" (<--SP)
@ -1290,8 +1274,6 @@ int X86FrameLowering::getFrameIndexOffsetFromSP(const MachineFunction &MF, int F
int X86FrameLowering::getFrameIndexReferenceFromSP(const MachineFunction &MF,
int FI,
unsigned &FrameReg) const {
const X86RegisterInfo *RegInfo =
MF.getSubtarget<X86Subtarget>().getRegisterInfo();
assert(!RegInfo->hasBasePointer(MF) && "we don't handle this case");
FrameReg = RegInfo->getStackRegister();
@ -1302,9 +1284,6 @@ bool X86FrameLowering::assignCalleeSavedSpillSlots(
MachineFunction &MF, const TargetRegisterInfo *TRI,
std::vector<CalleeSavedInfo> &CSI) const {
MachineFrameInfo *MFI = MF.getFrameInfo();
const X86RegisterInfo *RegInfo =
MF.getSubtarget<X86Subtarget>().getRegisterInfo();
unsigned SlotSize = RegInfo->getSlotSize();
X86MachineFunctionInfo *X86FI = MF.getInfo<X86MachineFunctionInfo>();
unsigned CalleeSavedFrameSize = 0;
@ -1369,10 +1348,6 @@ bool X86FrameLowering::spillCalleeSavedRegisters(
const TargetRegisterInfo *TRI) const {
DebugLoc DL = MBB.findDebugLoc(MI);
MachineFunction &MF = *MBB.getParent();
const X86Subtarget &STI = MF.getSubtarget<X86Subtarget>();
const TargetInstrInfo &TII = *STI.getInstrInfo();
// Push GPRs. It increases frame size.
unsigned Opc = STI.is64Bit() ? X86::PUSH64r : X86::PUSH32r;
for (unsigned i = CSI.size(); i != 0; --i) {
@ -1416,10 +1391,6 @@ bool X86FrameLowering::restoreCalleeSavedRegisters(MachineBasicBlock &MBB,
DebugLoc DL = MBB.findDebugLoc(MI);
MachineFunction &MF = *MBB.getParent();
const X86Subtarget &STI = MF.getSubtarget<X86Subtarget>();
const TargetInstrInfo &TII = *STI.getInstrInfo();
// Reload XMMs from stack frame.
for (unsigned i = 0, e = CSI.size(); i != e; ++i) {
unsigned Reg = CSI[i].getReg();
@ -1448,9 +1419,6 @@ void
X86FrameLowering::processFunctionBeforeCalleeSavedScan(MachineFunction &MF,
RegScavenger *RS) const {
MachineFrameInfo *MFI = MF.getFrameInfo();
const X86RegisterInfo *RegInfo =
MF.getSubtarget<X86Subtarget>().getRegisterInfo();
unsigned SlotSize = RegInfo->getSlotSize();
X86MachineFunctionInfo *X86FI = MF.getInfo<X86MachineFunctionInfo>();
int64_t TailCallReturnAddrDelta = X86FI->getTCReturnAddrDelta();
@ -1529,11 +1497,7 @@ static const uint64_t kSplitStackAvailable = 256;
void X86FrameLowering::adjustForSegmentedStacks(
MachineFunction &MF, MachineBasicBlock &PrologueMBB) const {
MachineFrameInfo *MFI = MF.getFrameInfo();
const X86Subtarget &STI = MF.getSubtarget<X86Subtarget>();
const TargetInstrInfo &TII = *STI.getInstrInfo();
uint64_t StackSize;
bool Is64Bit = STI.is64Bit();
const bool IsLP64 = STI.isTarget64BitLP64();
unsigned TlsReg, TlsOffset;
DebugLoc DL;
@ -1779,12 +1743,7 @@ void X86FrameLowering::adjustForSegmentedStacks(
/// if( temp0 < SP_LIMIT(P) ) goto IncStack else goto OldStart
void X86FrameLowering::adjustForHiPEPrologue(
MachineFunction &MF, MachineBasicBlock &PrologueMBB) const {
const X86Subtarget &STI = MF.getSubtarget<X86Subtarget>();
const TargetInstrInfo &TII = *STI.getInstrInfo();
MachineFrameInfo *MFI = MF.getFrameInfo();
const unsigned SlotSize = STI.getRegisterInfo()->getSlotSize();
const bool Is64Bit = STI.is64Bit();
const bool IsLP64 = STI.isTarget64BitLP64();
DebugLoc DL;
// HiPE-specific values
const unsigned HipeLeafWords = 24;
@ -1912,14 +1871,10 @@ void X86FrameLowering::adjustForHiPEPrologue(
void X86FrameLowering::
eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
MachineBasicBlock::iterator I) const {
const X86Subtarget &STI = MF.getSubtarget<X86Subtarget>();
const TargetInstrInfo &TII = *STI.getInstrInfo();
const X86RegisterInfo &RegInfo = *STI.getRegisterInfo();
unsigned StackPtr = RegInfo.getStackRegister();
unsigned StackPtr = RegInfo->getStackRegister();
bool reserveCallFrame = hasReservedCallFrame(MF);
unsigned Opcode = I->getOpcode();
bool isDestroy = Opcode == TII.getCallFrameDestroyOpcode();
bool IsLP64 = STI.isTarget64BitLP64();
DebugLoc DL = I->getDebugLoc();
uint64_t Amount = !reserveCallFrame ? I->getOperand(0).getImm() : 0;
uint64_t InternalAmt = (isDestroy || Amount) ? I->getOperand(1).getImm() : 0;

46
llvm/lib/Target/X86/X86FrameLowering.h
View File

@ -18,16 +18,36 @@
namespace llvm {
class X86Subtarget;
class X86RegisterInfo;
class X86FrameLowering : public TargetFrameLowering {
public:
explicit X86FrameLowering(StackDirection D, unsigned StackAl, int LAO)
: TargetFrameLowering(StackGrowsDown, StackAl, LAO) {}
X86FrameLowering(const X86Subtarget &STI, unsigned StackAlignOverride);
// Cached subtarget predicates.
const X86Subtarget &STI;
const TargetInstrInfo &TII;
const X86RegisterInfo *RegInfo;
unsigned SlotSize;
/// Is64Bit implies that x86_64 instructions are available.
bool Is64Bit;
bool IsLP64;
/// True if the 64-bit frame or stack pointer should be used. True for most
/// 64-bit targets with the exception of x32. If this is false, 32-bit
/// instruction operands should be used to manipulate StackPtr and FramePtr.
bool Uses64BitFramePtr;
/// Emit a call to the target's stack probe function. This is required for all
/// large stack allocations on Windows. The caller is required to materialize
/// the number of bytes to probe in RAX/EAX.
static void emitStackProbeCall(MachineFunction &MF, MachineBasicBlock &MBB,
MachineBasicBlock::iterator MBBI, DebugLoc DL);
void emitStackProbeCall(MachineFunction &MF, MachineBasicBlock &MBB,
MachineBasicBlock::iterator MBBI, DebugLoc DL) const;
void emitCalleeSavedFrameMoves(MachineBasicBlock &MBB,
MachineBasicBlock::iterator MBBI,
@ -83,18 +103,16 @@ public:
/// it is an ADD/SUB/LEA instruction it is deleted argument and the
/// stack adjustment is returned as a positive value for ADD/LEA and
/// a negative for SUB.
static int mergeSPUpdates(MachineBasicBlock &MBB,
MachineBasicBlock::iterator &MBBI,
unsigned StackPtr, bool doMergeWithPrevious);
int mergeSPUpdates(MachineBasicBlock &MBB, MachineBasicBlock::iterator &MBBI,
unsigned StackPtr, bool doMergeWithPrevious) const;
/// Emit a series of instructions to increment / decrement the stack
/// pointer by a constant value.
static void emitSPUpdate(MachineBasicBlock &MBB,
MachineBasicBlock::iterator &MBBI, unsigned StackPtr,
int64_t NumBytes, bool Is64BitTarget,
bool Is64BitStackPtr, bool UseLEA,
const TargetInstrInfo &TII,
const TargetRegisterInfo &TRI);
void emitSPUpdate(MachineBasicBlock &MBB, MachineBasicBlock::iterator &MBBI,
unsigned StackPtr, int64_t NumBytes, bool Is64BitTarget,
bool Is64BitStackPtr, bool UseLEA,
const TargetInstrInfo &TII,
const TargetRegisterInfo &TRI) const;
/// Check that LEA can be used on SP in an epilogue sequence for \p MF.
bool canUseLEAForSPInEpilogue(const MachineFunction &MF) const;
@ -115,6 +133,8 @@ private:
MachineBasicBlock &MBB,
MachineBasicBlock::iterator I,
uint64_t Amount) const;
uint64_t calculateMaxStackAlign(const MachineFunction &MF) const;
};
} // End llvm namespace

3
llvm/lib/Target/X86/X86ISelLowering.cpp
View File

@ -19683,7 +19683,8 @@ X86TargetLowering::EmitLoweredWinAlloca(MachineInstr *MI,
assert(!Subtarget->isTargetMachO());
X86FrameLowering::emitStackProbeCall(*BB->getParent(), *BB, MI, DL);
Subtarget->getFrameLowering()->emitStackProbeCall(*BB->getParent(), *BB, MI,
DL);
MI->eraseFromParent(); // The pseudo instruction is gone now.
return BB;

3
llvm/lib/Target/X86/X86Subtarget.cpp
View File

@ -300,8 +300,7 @@ X86Subtarget::X86Subtarget(const Triple &TT, const std::string &CPU,
TargetTriple.getEnvironment() == Triple::CODE16),
TSInfo(*TM.getDataLayout()),
InstrInfo(initializeSubtargetDependencies(CPU, FS)), TLInfo(TM, *this),
FrameLowering(TargetFrameLowering::StackGrowsDown, getStackAlignment(),
is64Bit() ? -8 : -4) {
FrameLowering(*this, getStackAlignment()) {
// Determine the PICStyle based on the target selected.
if (TM.getRelocationModel() == Reloc::Static) {
// Unless we're in PIC or DynamicNoPIC mode, set the PIC style to None.