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Infrastructure for getting the machine code size of a function and an instruction. X86, PowerPC and ARM are implemented

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@49809 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nicolas Geoffray
2008-04-16 20:10:13 +00:00
parent dc00858e11
commit 52e724ad7e
14 changed files with 636 additions and 208 deletions
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lib/Target/X86/X86CodeEmitter.cpp
+12 -147
View File
@@ -92,8 +92,6 @@ namespace {
intptr_t PCAdj = 0);
unsigned getX86RegNum(unsigned RegNo) const;
bool isX86_64ExtendedReg(const MachineOperand &MO);
unsigned determineREX(const MachineInstr &MI);
bool gvNeedsLazyPtr(const GlobalValue *GV);
};
@@ -405,139 +403,6 @@ void Emitter::emitMemModRMByte(const MachineInstr &MI,
}
}
static unsigned sizeOfImm(const TargetInstrDesc *Desc) {
switch (Desc->TSFlags & X86II::ImmMask) {
case X86II::Imm8: return 1;
case X86II::Imm16: return 2;
case X86II::Imm32: return 4;
case X86II::Imm64: return 8;
default: assert(0 && "Immediate size not set!");
return 0;
}
}
/// isX86_64ExtendedReg - Is the MachineOperand a x86-64 extended register?
/// e.g. r8, xmm8, etc.
bool Emitter::isX86_64ExtendedReg(const MachineOperand &MO) {
if (!MO.isRegister()) return false;
switch (MO.getReg()) {
default: break;
case X86::R8: case X86::R9: case X86::R10: case X86::R11:
case X86::R12: case X86::R13: case X86::R14: case X86::R15:
case X86::R8D: case X86::R9D: case X86::R10D: case X86::R11D:
case X86::R12D: case X86::R13D: case X86::R14D: case X86::R15D:
case X86::R8W: case X86::R9W: case X86::R10W: case X86::R11W:
case X86::R12W: case X86::R13W: case X86::R14W: case X86::R15W:
case X86::R8B: case X86::R9B: case X86::R10B: case X86::R11B:
case X86::R12B: case X86::R13B: case X86::R14B: case X86::R15B:
case X86::XMM8: case X86::XMM9: case X86::XMM10: case X86::XMM11:
case X86::XMM12: case X86::XMM13: case X86::XMM14: case X86::XMM15:
return true;
}
return false;
}
inline static bool isX86_64NonExtLowByteReg(unsigned reg) {
return (reg == X86::SPL || reg == X86::BPL ||
reg == X86::SIL || reg == X86::DIL);
}
/// determineREX - Determine if the MachineInstr has to be encoded with a X86-64
/// REX prefix which specifies 1) 64-bit instructions, 2) non-default operand
/// size, and 3) use of X86-64 extended registers.
unsigned Emitter::determineREX(const MachineInstr &MI) {
unsigned REX = 0;
const TargetInstrDesc &Desc = MI.getDesc();
// Pseudo instructions do not need REX prefix byte.
if ((Desc.TSFlags & X86II::FormMask) == X86II::Pseudo)
return 0;
if (Desc.TSFlags & X86II::REX_W)
REX |= 1 << 3;
unsigned NumOps = Desc.getNumOperands();
if (NumOps) {
bool isTwoAddr = NumOps > 1 &&
Desc.getOperandConstraint(1, TOI::TIED_TO) != -1;
// If it accesses SPL, BPL, SIL, or DIL, then it requires a 0x40 REX prefix.
unsigned i = isTwoAddr ? 1 : 0;
for (unsigned e = NumOps; i != e; ++i) {
const MachineOperand& MO = MI.getOperand(i);
if (MO.isRegister()) {
unsigned Reg = MO.getReg();
if (isX86_64NonExtLowByteReg(Reg))
REX |= 0x40;
}
}
switch (Desc.TSFlags & X86II::FormMask) {
case X86II::MRMInitReg:
if (isX86_64ExtendedReg(MI.getOperand(0)))
REX |= (1 << 0) | (1 << 2);
break;
case X86II::MRMSrcReg: {
if (isX86_64ExtendedReg(MI.getOperand(0)))
REX |= 1 << 2;
i = isTwoAddr ? 2 : 1;
for (unsigned e = NumOps; i != e; ++i) {
const MachineOperand& MO = MI.getOperand(i);
if (isX86_64ExtendedReg(MO))
REX |= 1 << 0;
}
break;
}
case X86II::MRMSrcMem: {
if (isX86_64ExtendedReg(MI.getOperand(0)))
REX |= 1 << 2;
unsigned Bit = 0;
i = isTwoAddr ? 2 : 1;
for (; i != NumOps; ++i) {
const MachineOperand& MO = MI.getOperand(i);
if (MO.isRegister()) {
if (isX86_64ExtendedReg(MO))
REX |= 1 << Bit;
Bit++;
}
}
break;
}
case X86II::MRM0m: case X86II::MRM1m:
case X86II::MRM2m: case X86II::MRM3m:
case X86II::MRM4m: case X86II::MRM5m:
case X86II::MRM6m: case X86II::MRM7m:
case X86II::MRMDestMem: {
unsigned e = isTwoAddr ? 5 : 4;
i = isTwoAddr ? 1 : 0;
if (NumOps > e && isX86_64ExtendedReg(MI.getOperand(e)))
REX |= 1 << 2;
unsigned Bit = 0;
for (; i != e; ++i) {
const MachineOperand& MO = MI.getOperand(i);
if (MO.isRegister()) {
if (isX86_64ExtendedReg(MO))
REX |= 1 << Bit;
Bit++;
}
}
break;
}
default: {
if (isX86_64ExtendedReg(MI.getOperand(0)))
REX |= 1 << 0;
i = isTwoAddr ? 2 : 1;
for (unsigned e = NumOps; i != e; ++i) {
const MachineOperand& MO = MI.getOperand(i);
if (isX86_64ExtendedReg(MO))
REX |= 1 << 2;
}
break;
}
}
}
return REX;
}
void Emitter::emitInstruction(const MachineInstr &MI,
const TargetInstrDesc *Desc) {
DOUT << MI;
@@ -584,7 +449,7 @@ void Emitter::emitInstruction(const MachineInstr &MI,
if (Is64BitMode) {
// REX prefix
unsigned REX = determineREX(MI);
unsigned REX = X86InstrInfo::determineREX(MI);
if (REX)
MCE.emitByte(0x40 | REX);
}
@@ -632,7 +497,7 @@ void Emitter::emitInstruction(const MachineInstr &MI,
case X86::MOVPC32r: {
// This emits the "call" portion of this pseudo instruction.
MCE.emitByte(BaseOpcode);
emitConstant(0, sizeOfImm(Desc));
emitConstant(0, X86InstrInfo::sizeOfImm(Desc));
// Remember PIC base.
PICBaseOffset = MCE.getCurrentPCOffset();
X86JITInfo *JTI = dynamic_cast<X86JITInfo*>(TM.getJITInfo());
@@ -657,7 +522,7 @@ void Emitter::emitInstruction(const MachineInstr &MI,
} else if (MO.isExternalSymbol()) {
emitExternalSymbolAddress(MO.getSymbolName(), X86::reloc_pcrel_word);
} else if (MO.isImmediate()) {
emitConstant(MO.getImm(), sizeOfImm(Desc));
emitConstant(MO.getImm(), X86InstrInfo::sizeOfImm(Desc));
} else {
assert(0 && "Unknown RawFrm operand!");
}
@@ -669,7 +534,7 @@ void Emitter::emitInstruction(const MachineInstr &MI,
if (CurOp != NumOps) {
const MachineOperand &MO1 = MI.getOperand(CurOp++);
unsigned Size = sizeOfImm(Desc);
unsigned Size = X86InstrInfo::sizeOfImm(Desc);
if (MO1.isImmediate())
emitConstant(MO1.getImm(), Size);
else {
@@ -698,7 +563,7 @@ void Emitter::emitInstruction(const MachineInstr &MI,
getX86RegNum(MI.getOperand(CurOp+1).getReg()));
CurOp += 2;
if (CurOp != NumOps)
emitConstant(MI.getOperand(CurOp++).getImm(), sizeOfImm(Desc));
emitConstant(MI.getOperand(CurOp++).getImm(), X86InstrInfo::sizeOfImm(Desc));
break;
}
case X86II::MRMDestMem: {
@@ -706,7 +571,7 @@ void Emitter::emitInstruction(const MachineInstr &MI,
emitMemModRMByte(MI, CurOp, getX86RegNum(MI.getOperand(CurOp+4).getReg()));
CurOp += 5;
if (CurOp != NumOps)
emitConstant(MI.getOperand(CurOp++).getImm(), sizeOfImm(Desc));
emitConstant(MI.getOperand(CurOp++).getImm(), X86InstrInfo::sizeOfImm(Desc));
break;
}
@@ -716,18 +581,18 @@ void Emitter::emitInstruction(const MachineInstr &MI,
getX86RegNum(MI.getOperand(CurOp).getReg()));
CurOp += 2;
if (CurOp != NumOps)
emitConstant(MI.getOperand(CurOp++).getImm(), sizeOfImm(Desc));
emitConstant(MI.getOperand(CurOp++).getImm(), X86InstrInfo::sizeOfImm(Desc));
break;
case X86II::MRMSrcMem: {
intptr_t PCAdj = (CurOp+5 != NumOps) ? sizeOfImm(Desc) : 0;
intptr_t PCAdj = (CurOp+5 != NumOps) ? X86InstrInfo::sizeOfImm(Desc) : 0;
MCE.emitByte(BaseOpcode);
emitMemModRMByte(MI, CurOp+1, getX86RegNum(MI.getOperand(CurOp).getReg()),
PCAdj);
CurOp += 5;
if (CurOp != NumOps)
emitConstant(MI.getOperand(CurOp++).getImm(), sizeOfImm(Desc));
emitConstant(MI.getOperand(CurOp++).getImm(), X86InstrInfo::sizeOfImm(Desc));
break;
}
@@ -741,7 +606,7 @@ void Emitter::emitInstruction(const MachineInstr &MI,
if (CurOp != NumOps) {
const MachineOperand &MO1 = MI.getOperand(CurOp++);
unsigned Size = sizeOfImm(Desc);
unsigned Size = X86InstrInfo::sizeOfImm(Desc);
if (MO1.isImmediate())
emitConstant(MO1.getImm(), Size);
else {
@@ -769,7 +634,7 @@ void Emitter::emitInstruction(const MachineInstr &MI,
case X86II::MRM4m: case X86II::MRM5m:
case X86II::MRM6m: case X86II::MRM7m: {
intptr_t PCAdj = (CurOp+4 != NumOps) ?
(MI.getOperand(CurOp+4).isImmediate() ? sizeOfImm(Desc) : 4) : 0;
(MI.getOperand(CurOp+4).isImmediate() ? X86InstrInfo::sizeOfImm(Desc) : 4) : 0;
MCE.emitByte(BaseOpcode);
emitMemModRMByte(MI, CurOp, (Desc->TSFlags & X86II::FormMask)-X86II::MRM0m,
@@ -778,7 +643,7 @@ void Emitter::emitInstruction(const MachineInstr &MI,
if (CurOp != NumOps) {
const MachineOperand &MO = MI.getOperand(CurOp++);
unsigned Size = sizeOfImm(Desc);
unsigned Size = X86InstrInfo::sizeOfImm(Desc);
if (MO.isImmediate())
emitConstant(MO.getImm(), Size);
else {