//===- X86InstrInfo.cpp - X86 Instruction Information -----------*- C++ -*-===//
-//
+//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
-//
+//
//===----------------------------------------------------------------------===//
//
// This file contains the X86 implementation of the TargetInstrInfo class.
#include "X86InstrInfo.h"
#include "X86.h"
-#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "X86GenInstrInfo.inc"
+#include "X86InstrBuilder.h"
+#include "X86Subtarget.h"
+#include "X86TargetMachine.h"
+#include "llvm/CodeGen/MachineInstrBuilder.h"
+#include "llvm/CodeGen/LiveVariables.h"
using namespace llvm;
-X86InstrInfo::X86InstrInfo()
- : TargetInstrInfo(X86Insts, sizeof(X86Insts)/sizeof(X86Insts[0])) {
+X86InstrInfo::X86InstrInfo(X86TargetMachine &tm)
+ : TargetInstrInfo(X86Insts, sizeof(X86Insts)/sizeof(X86Insts[0])),
+ TM(tm), RI(tm, *this) {
+}
+
+/// getDWARF_LABELOpcode - Return the opcode of the target's DWARF_LABEL
+/// instruction if it has one. This is used by codegen passes that update
+/// DWARF line number info as they modify the code.
+unsigned X86InstrInfo::getDWARF_LABELOpcode() const {
+ return X86::DWARF_LABEL;
}
unsigned& sourceReg,
unsigned& destReg) const {
MachineOpCode oc = MI.getOpcode();
- if (oc == X86::MOV8rr || oc == X86::MOV16rr || oc == X86::MOV32rr ||
- oc == X86::FpMOV) {
+ if (oc == X86::MOV8rr || oc == X86::MOV16rr ||
+ oc == X86::MOV32rr || oc == X86::MOV64rr ||
+ oc == X86::MOV16to16_ || oc == X86::MOV32to32_ ||
+ oc == X86::FpMOV || oc == X86::MOVSSrr || oc == X86::MOVSDrr ||
+ oc == X86::FsMOVAPSrr || oc == X86::FsMOVAPDrr ||
+ oc == X86::MOVAPSrr || oc == X86::MOVAPDrr ||
+ oc == X86::MOVSS2PSrr || oc == X86::MOVSD2PDrr ||
+ oc == X86::MOVPS2SSrr || oc == X86::MOVPD2SDrr) {
assert(MI.getNumOperands() == 2 &&
MI.getOperand(0).isRegister() &&
MI.getOperand(1).isRegister() &&
return false;
}
-void X86InstrInfo::insertGoto(MachineBasicBlock& MBB,
- MachineBasicBlock& TMBB) const {
- BuildMI(MBB, MBB.end(), X86::JMP, 1).addMBB(&TMBB);
-}
-
-MachineBasicBlock::iterator
-X86InstrInfo::reverseBranchCondition(MachineBasicBlock::iterator MI) const {
- unsigned Opcode = MI->getOpcode();
- assert(isBranch(Opcode) && "MachineInstr must be a branch");
- unsigned ROpcode;
- switch (Opcode) {
- case X86::JB: ROpcode = X86::JAE; break;
- case X86::JAE: ROpcode = X86::JB; break;
- case X86::JE: ROpcode = X86::JNE; break;
- case X86::JNE: ROpcode = X86::JE; break;
- case X86::JBE: ROpcode = X86::JA; break;
- case X86::JA: ROpcode = X86::JBE; break;
- case X86::JS: ROpcode = X86::JNS; break;
- case X86::JNS: ROpcode = X86::JS; break;
- case X86::JL: ROpcode = X86::JGE; break;
- case X86::JGE: ROpcode = X86::JL; break;
- case X86::JLE: ROpcode = X86::JG; break;
- case X86::JG: ROpcode = X86::JLE; break;
+unsigned X86InstrInfo::isLoadFromStackSlot(MachineInstr *MI,
+ int &FrameIndex) const {
+ switch (MI->getOpcode()) {
+ default: break;
+ case X86::MOV8rm:
+ case X86::MOV16rm:
+ case X86::MOV16_rm:
+ case X86::MOV32rm:
+ case X86::MOV32_rm:
+ case X86::MOV64rm:
+ case X86::FpLD64m:
+ case X86::MOVSSrm:
+ case X86::MOVSDrm:
+ case X86::MOVAPSrm:
+ case X86::MOVAPDrm:
+ if (MI->getOperand(1).isFrameIndex() && MI->getOperand(2).isImmediate() &&
+ MI->getOperand(3).isRegister() && MI->getOperand(4).isImmediate() &&
+ MI->getOperand(2).getImmedValue() == 1 &&
+ MI->getOperand(3).getReg() == 0 &&
+ MI->getOperand(4).getImmedValue() == 0) {
+ FrameIndex = MI->getOperand(1).getFrameIndex();
+ return MI->getOperand(0).getReg();
+ }
+ break;
+ }
+ return 0;
+}
+
+unsigned X86InstrInfo::isStoreToStackSlot(MachineInstr *MI,
+ int &FrameIndex) const {
+ switch (MI->getOpcode()) {
+ default: break;
+ case X86::MOV8mr:
+ case X86::MOV16mr:
+ case X86::MOV16_mr:
+ case X86::MOV32mr:
+ case X86::MOV32_mr:
+ case X86::MOV64mr:
+ case X86::FpSTP64m:
+ case X86::MOVSSmr:
+ case X86::MOVSDmr:
+ case X86::MOVAPSmr:
+ case X86::MOVAPDmr:
+ if (MI->getOperand(0).isFrameIndex() && MI->getOperand(1).isImmediate() &&
+ MI->getOperand(2).isRegister() && MI->getOperand(3).isImmediate() &&
+ MI->getOperand(1).getImmedValue() == 1 &&
+ MI->getOperand(2).getReg() == 0 &&
+ MI->getOperand(3).getImmedValue() == 0) {
+ FrameIndex = MI->getOperand(0).getFrameIndex();
+ return MI->getOperand(4).getReg();
+ }
+ break;
+ }
+ return 0;
+}
+
+
+/// convertToThreeAddress - This method must be implemented by targets that
+/// set the M_CONVERTIBLE_TO_3_ADDR flag. When this flag is set, the target
+/// may be able to convert a two-address instruction into a true
+/// three-address instruction on demand. This allows the X86 target (for
+/// example) to convert ADD and SHL instructions into LEA instructions if they
+/// would require register copies due to two-addressness.
+///
+/// This method returns a null pointer if the transformation cannot be
+/// performed, otherwise it returns the new instruction.
+///
+MachineInstr *
+X86InstrInfo::convertToThreeAddress(MachineFunction::iterator &MFI,
+ MachineBasicBlock::iterator &MBBI,
+ LiveVariables &LV) const {
+ MachineInstr *MI = MBBI;
+ // All instructions input are two-addr instructions. Get the known operands.
+ unsigned Dest = MI->getOperand(0).getReg();
+ unsigned Src = MI->getOperand(1).getReg();
+
+ MachineInstr *NewMI = NULL;
+ // FIXME: 16-bit LEA's are really slow on Athlons, but not bad on P4's. When
+ // we have subtarget support, enable the 16-bit LEA generation here.
+ bool DisableLEA16 = true;
+
+ switch (MI->getOpcode()) {
+ default: break;
+ case X86::SHUFPSrri: {
+ assert(MI->getNumOperands() == 4 && "Unknown shufps instruction!");
+ const X86Subtarget *Subtarget = &TM.getSubtarget<X86Subtarget>();
+ unsigned A = MI->getOperand(0).getReg();
+ unsigned B = MI->getOperand(1).getReg();
+ unsigned C = MI->getOperand(2).getReg();
+ unsigned M = MI->getOperand(3).getImmedValue();
+ if (!Subtarget->hasSSE2() || B != C) return 0;
+ NewMI = BuildMI(get(X86::PSHUFDri), A).addReg(B).addImm(M);
+ goto Done;
+ }
+ }
+
+ // FIXME: None of these instructions are promotable to LEAs without
+ // additional information. In particular, LEA doesn't set the flags that
+ // add and inc do. :(
+ return 0;
+
+ switch (MI->getOpcode()) {
+ case X86::INC32r:
+ case X86::INC64_32r:
+ assert(MI->getNumOperands() == 2 && "Unknown inc instruction!");
+ NewMI = addRegOffset(BuildMI(get(X86::LEA32r), Dest), Src, 1);
+ break;
+ case X86::INC16r:
+ case X86::INC64_16r:
+ if (DisableLEA16) return 0;
+ assert(MI->getNumOperands() == 2 && "Unknown inc instruction!");
+ NewMI = addRegOffset(BuildMI(get(X86::LEA16r), Dest), Src, 1);
+ break;
+ case X86::DEC32r:
+ case X86::DEC64_32r:
+ assert(MI->getNumOperands() == 2 && "Unknown dec instruction!");
+ NewMI = addRegOffset(BuildMI(get(X86::LEA32r), Dest), Src, -1);
+ break;
+ case X86::DEC16r:
+ case X86::DEC64_16r:
+ if (DisableLEA16) return 0;
+ assert(MI->getNumOperands() == 2 && "Unknown dec instruction!");
+ NewMI = addRegOffset(BuildMI(get(X86::LEA16r), Dest), Src, -1);
+ break;
+ case X86::ADD32rr:
+ assert(MI->getNumOperands() == 3 && "Unknown add instruction!");
+ NewMI = addRegReg(BuildMI(get(X86::LEA32r), Dest), Src,
+ MI->getOperand(2).getReg());
+ break;
+ case X86::ADD16rr:
+ if (DisableLEA16) return 0;
+ assert(MI->getNumOperands() == 3 && "Unknown add instruction!");
+ NewMI = addRegReg(BuildMI(get(X86::LEA16r), Dest), Src,
+ MI->getOperand(2).getReg());
+ break;
+ case X86::ADD32ri:
+ case X86::ADD32ri8:
+ assert(MI->getNumOperands() == 3 && "Unknown add instruction!");
+ if (MI->getOperand(2).isImmediate())
+ NewMI = addRegOffset(BuildMI(get(X86::LEA32r), Dest), Src,
+ MI->getOperand(2).getImmedValue());
+ break;
+ case X86::ADD16ri:
+ case X86::ADD16ri8:
+ if (DisableLEA16) return 0;
+ assert(MI->getNumOperands() == 3 && "Unknown add instruction!");
+ if (MI->getOperand(2).isImmediate())
+ NewMI = addRegOffset(BuildMI(get(X86::LEA16r), Dest), Src,
+ MI->getOperand(2).getImmedValue());
+ break;
+ case X86::SHL16ri:
+ if (DisableLEA16) return 0;
+ case X86::SHL32ri:
+ assert(MI->getNumOperands() == 3 && MI->getOperand(2).isImmediate() &&
+ "Unknown shl instruction!");
+ unsigned ShAmt = MI->getOperand(2).getImmedValue();
+ if (ShAmt == 1 || ShAmt == 2 || ShAmt == 3) {
+ X86AddressMode AM;
+ AM.Scale = 1 << ShAmt;
+ AM.IndexReg = Src;
+ unsigned Opc = MI->getOpcode() == X86::SHL32ri ? X86::LEA32r :X86::LEA16r;
+ NewMI = addFullAddress(BuildMI(get(Opc), Dest), AM);
+ }
+ break;
+ }
+
+Done:
+ if (NewMI) {
+ NewMI->copyKillDeadInfo(MI);
+ LV.instructionChanged(MI, NewMI); // Update live variables
+ MFI->insert(MBBI, NewMI); // Insert the new inst
+ }
+ return NewMI;
+}
+
+/// commuteInstruction - We have a few instructions that must be hacked on to
+/// commute them.
+///
+MachineInstr *X86InstrInfo::commuteInstruction(MachineInstr *MI) const {
+ // FIXME: Can commute cmoves by changing the condition!
+ switch (MI->getOpcode()) {
+ case X86::SHRD16rri8: // A = SHRD16rri8 B, C, I -> A = SHLD16rri8 C, B, (16-I)
+ case X86::SHLD16rri8: // A = SHLD16rri8 B, C, I -> A = SHRD16rri8 C, B, (16-I)
+ case X86::SHRD32rri8: // A = SHRD32rri8 B, C, I -> A = SHLD32rri8 C, B, (32-I)
+ case X86::SHLD32rri8:{// A = SHLD32rri8 B, C, I -> A = SHRD32rri8 C, B, (32-I)
+ unsigned Opc;
+ unsigned Size;
+ switch (MI->getOpcode()) {
+ default: assert(0 && "Unreachable!");
+ case X86::SHRD16rri8: Size = 16; Opc = X86::SHLD16rri8; break;
+ case X86::SHLD16rri8: Size = 16; Opc = X86::SHRD16rri8; break;
+ case X86::SHRD32rri8: Size = 32; Opc = X86::SHLD32rri8; break;
+ case X86::SHLD32rri8: Size = 32; Opc = X86::SHRD32rri8; break;
+ }
+ unsigned Amt = MI->getOperand(3).getImmedValue();
+ unsigned A = MI->getOperand(0).getReg();
+ unsigned B = MI->getOperand(1).getReg();
+ unsigned C = MI->getOperand(2).getReg();
+ bool BisKill = MI->getOperand(1).isKill();
+ bool CisKill = MI->getOperand(2).isKill();
+ return BuildMI(get(Opc), A).addReg(C, false, false, CisKill)
+ .addReg(B, false, false, BisKill).addImm(Size-Amt);
+ }
default:
- assert(0 && "Cannot reverse unconditional branches!");
+ return TargetInstrInfo::commuteInstruction(MI);
+ }
+}
+
+static X86::CondCode GetCondFromBranchOpc(unsigned BrOpc) {
+ switch (BrOpc) {
+ default: return X86::COND_INVALID;
+ case X86::JE: return X86::COND_E;
+ case X86::JNE: return X86::COND_NE;
+ case X86::JL: return X86::COND_L;
+ case X86::JLE: return X86::COND_LE;
+ case X86::JG: return X86::COND_G;
+ case X86::JGE: return X86::COND_GE;
+ case X86::JB: return X86::COND_B;
+ case X86::JBE: return X86::COND_BE;
+ case X86::JA: return X86::COND_A;
+ case X86::JAE: return X86::COND_AE;
+ case X86::JS: return X86::COND_S;
+ case X86::JNS: return X86::COND_NS;
+ case X86::JP: return X86::COND_P;
+ case X86::JNP: return X86::COND_NP;
+ case X86::JO: return X86::COND_O;
+ case X86::JNO: return X86::COND_NO;
+ }
+}
+
+unsigned X86::GetCondBranchFromCond(X86::CondCode CC) {
+ switch (CC) {
+ default: assert(0 && "Illegal condition code!");
+ case X86::COND_E: return X86::JE;
+ case X86::COND_NE: return X86::JNE;
+ case X86::COND_L: return X86::JL;
+ case X86::COND_LE: return X86::JLE;
+ case X86::COND_G: return X86::JG;
+ case X86::COND_GE: return X86::JGE;
+ case X86::COND_B: return X86::JB;
+ case X86::COND_BE: return X86::JBE;
+ case X86::COND_A: return X86::JA;
+ case X86::COND_AE: return X86::JAE;
+ case X86::COND_S: return X86::JS;
+ case X86::COND_NS: return X86::JNS;
+ case X86::COND_P: return X86::JP;
+ case X86::COND_NP: return X86::JNP;
+ case X86::COND_O: return X86::JO;
+ case X86::COND_NO: return X86::JNO;
+ }
+}
+
+/// GetOppositeBranchCondition - Return the inverse of the specified condition,
+/// e.g. turning COND_E to COND_NE.
+X86::CondCode X86::GetOppositeBranchCondition(X86::CondCode CC) {
+ switch (CC) {
+ default: assert(0 && "Illegal condition code!");
+ case X86::COND_E: return X86::COND_NE;
+ case X86::COND_NE: return X86::COND_E;
+ case X86::COND_L: return X86::COND_GE;
+ case X86::COND_LE: return X86::COND_G;
+ case X86::COND_G: return X86::COND_LE;
+ case X86::COND_GE: return X86::COND_L;
+ case X86::COND_B: return X86::COND_AE;
+ case X86::COND_BE: return X86::COND_A;
+ case X86::COND_A: return X86::COND_BE;
+ case X86::COND_AE: return X86::COND_B;
+ case X86::COND_S: return X86::COND_NS;
+ case X86::COND_NS: return X86::COND_S;
+ case X86::COND_P: return X86::COND_NP;
+ case X86::COND_NP: return X86::COND_P;
+ case X86::COND_O: return X86::COND_NO;
+ case X86::COND_NO: return X86::COND_O;
}
- MachineBasicBlock* MBB = MI->getParent();
- MachineBasicBlock* TMBB = MI->getOperand(0).getMachineBasicBlock();
- return BuildMI(*MBB, MBB->erase(MI), ROpcode, 1).addMBB(TMBB);
+}
+
+
+bool X86InstrInfo::AnalyzeBranch(MachineBasicBlock &MBB,
+ MachineBasicBlock *&TBB,
+ MachineBasicBlock *&FBB,
+ std::vector<MachineOperand> &Cond) const {
+ // TODO: If FP_REG_KILL is around, ignore it.
+
+ // If the block has no terminators, it just falls into the block after it.
+ MachineBasicBlock::iterator I = MBB.end();
+ if (I == MBB.begin() || !isTerminatorInstr((--I)->getOpcode()))
+ return false;
+
+ // Get the last instruction in the block.
+ MachineInstr *LastInst = I;
+
+ // If there is only one terminator instruction, process it.
+ if (I == MBB.begin() || !isTerminatorInstr((--I)->getOpcode())) {
+ if (!isBranch(LastInst->getOpcode()))
+ return true;
+
+ // If the block ends with a branch there are 3 possibilities:
+ // it's an unconditional, conditional, or indirect branch.
+
+ if (LastInst->getOpcode() == X86::JMP) {
+ TBB = LastInst->getOperand(0).getMachineBasicBlock();
+ return false;
+ }
+ X86::CondCode BranchCode = GetCondFromBranchOpc(LastInst->getOpcode());
+ if (BranchCode == X86::COND_INVALID)
+ return true; // Can't handle indirect branch.
+
+ // Otherwise, block ends with fall-through condbranch.
+ TBB = LastInst->getOperand(0).getMachineBasicBlock();
+ Cond.push_back(MachineOperand::CreateImm(BranchCode));
+ return false;
+ }
+
+ // Get the instruction before it if it's a terminator.
+ MachineInstr *SecondLastInst = I;
+
+ // If there are three terminators, we don't know what sort of block this is.
+ if (SecondLastInst && I != MBB.begin() &&
+ isTerminatorInstr((--I)->getOpcode()))
+ return true;
+
+ // If the block ends with X86::JMP and a conditional branch, handle it.
+ X86::CondCode BranchCode = GetCondFromBranchOpc(SecondLastInst->getOpcode());
+ if (BranchCode != X86::COND_INVALID && LastInst->getOpcode() == X86::JMP) {
+ TBB = SecondLastInst->getOperand(0).getMachineBasicBlock();
+ Cond.push_back(MachineOperand::CreateImm(BranchCode));
+ FBB = LastInst->getOperand(0).getMachineBasicBlock();
+ return false;
+ }
+
+ // Otherwise, can't handle this.
+ return true;
+}
+
+void X86InstrInfo::RemoveBranch(MachineBasicBlock &MBB) const {
+ MachineBasicBlock::iterator I = MBB.end();
+ if (I == MBB.begin()) return;
+ --I;
+ if (I->getOpcode() != X86::JMP &&
+ GetCondFromBranchOpc(I->getOpcode()) == X86::COND_INVALID)
+ return;
+
+ // Remove the branch.
+ I->eraseFromParent();
+
+ I = MBB.end();
+
+ if (I == MBB.begin()) return;
+ --I;
+ if (GetCondFromBranchOpc(I->getOpcode()) == X86::COND_INVALID)
+ return;
+
+ // Remove the branch.
+ I->eraseFromParent();
+}
+
+void X86InstrInfo::InsertBranch(MachineBasicBlock &MBB, MachineBasicBlock *TBB,
+ MachineBasicBlock *FBB,
+ const std::vector<MachineOperand> &Cond) const {
+ // Shouldn't be a fall through.
+ assert(TBB && "InsertBranch must not be told to insert a fallthrough");
+ assert((Cond.size() == 1 || Cond.size() == 0) &&
+ "X86 branch conditions have one component!");
+
+ if (FBB == 0) { // One way branch.
+ if (Cond.empty()) {
+ // Unconditional branch?
+ BuildMI(&MBB, get(X86::JMP)).addMBB(TBB);
+ } else {
+ // Conditional branch.
+ unsigned Opc = GetCondBranchFromCond((X86::CondCode)Cond[0].getImm());
+ BuildMI(&MBB, get(Opc)).addMBB(TBB);
+ }
+ return;
+ }
+
+ // Two-way Conditional branch.
+ unsigned Opc = GetCondBranchFromCond((X86::CondCode)Cond[0].getImm());
+ BuildMI(&MBB, get(Opc)).addMBB(TBB);
+ BuildMI(&MBB, get(X86::JMP)).addMBB(FBB);
+}
+
+bool X86InstrInfo::BlockHasNoFallThrough(MachineBasicBlock &MBB) const {
+ if (MBB.empty()) return false;
+
+ switch (MBB.back().getOpcode()) {
+ case X86::JMP: // Uncond branch.
+ case X86::JMP32r: // Indirect branch.
+ case X86::JMP32m: // Indirect branch through mem.
+ return true;
+ default: return false;
+ }
+}
+
+bool X86InstrInfo::
+ReverseBranchCondition(std::vector<MachineOperand> &Cond) const {
+ assert(Cond.size() == 1 && "Invalid X86 branch condition!");
+ Cond[0].setImm(GetOppositeBranchCondition((X86::CondCode)Cond[0].getImm()));
+ return false;
+}
+
+const TargetRegisterClass *X86InstrInfo::getPointerRegClass() const {
+ const X86Subtarget *Subtarget = &TM.getSubtarget<X86Subtarget>();
+ if (Subtarget->is64Bit())
+ return &X86::GR64RegClass;
+ else
+ return &X86::GR32RegClass;
}
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