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llvm/lib/Target/X86/X86FloatingPoint.cpp
Evan Cheng 2b15271571 Added fisttp for fp to int conversion. 
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@26283 91177308-0d34-0410-b5e6-96231b3b80d8
2006-02-18 02:36:28 +00:00

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//===-- X86FloatingPoint.cpp - Floating point Reg -> Stack converter ------===//
//
// 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 defines the pass which converts floating point instructions from
// virtual registers into register stack instructions. This pass uses live
// variable information to indicate where the FPn registers are used and their
// lifetimes.
//
// This pass is hampered by the lack of decent CFG manipulation routines for
// machine code. In particular, this wants to be able to split critical edges
// as necessary, traverse the machine basic block CFG in depth-first order, and
// allow there to be multiple machine basic blocks for each LLVM basicblock
// (needed for critical edge splitting).
//
// In particular, this pass currently barfs on critical edges. Because of this,
// it requires the instruction selector to insert FP_REG_KILL instructions on
// the exits of any basic block that has critical edges going from it, or which
// branch to a critical basic block.
//
// FIXME: this is not implemented yet. The stackifier pass only works on local
// basic blocks.
//
//===----------------------------------------------------------------------===//
#define DEBUG_TYPE "fp"
#include "X86.h"
#include "X86InstrInfo.h"
#include "llvm/CodeGen/MachineFunctionPass.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/LiveVariables.h"
#include "llvm/CodeGen/Passes.h"
#include "llvm/Target/TargetInstrInfo.h"
#include "llvm/Target/TargetMachine.h"
#include "llvm/Support/Debug.h"
#include "llvm/ADT/DepthFirstIterator.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/ADT/STLExtras.h"
#include <algorithm>
#include <iostream>
#include <set>
using namespace llvm;
namespace {
Statistic<> NumFXCH("x86-codegen", "Number of fxch instructions inserted");
Statistic<> NumFP ("x86-codegen", "Number of floating point instructions");
struct FPS : public MachineFunctionPass {
virtual bool runOnMachineFunction(MachineFunction &MF);
virtual const char *getPassName() const { return "X86 FP Stackifier"; }
virtual void getAnalysisUsage(AnalysisUsage &AU) const {
AU.addRequired<LiveVariables>();
MachineFunctionPass::getAnalysisUsage(AU);
}
private:
LiveVariables *LV; // Live variable info for current function...
MachineBasicBlock *MBB; // Current basic block
unsigned Stack[8]; // FP<n> Registers in each stack slot...
unsigned RegMap[8]; // Track which stack slot contains each register
unsigned StackTop; // The current top of the FP stack.
void dumpStack() const {
std::cerr << "Stack contents:";
for (unsigned i = 0; i != StackTop; ++i) {
std::cerr << " FP" << Stack[i];
assert(RegMap[Stack[i]] == i && "Stack[] doesn't match RegMap[]!");
}
std::cerr << "\n";
}
private:
// getSlot - Return the stack slot number a particular register number is
// in...
unsigned getSlot(unsigned RegNo) const {
assert(RegNo < 8 && "Regno out of range!");
return RegMap[RegNo];
}
// getStackEntry - Return the X86::FP<n> register in register ST(i)
unsigned getStackEntry(unsigned STi) const {
assert(STi < StackTop && "Access past stack top!");
return Stack[StackTop-1-STi];
}
// getSTReg - Return the X86::ST(i) register which contains the specified
// FP<RegNo> register
unsigned getSTReg(unsigned RegNo) const {
return StackTop - 1 - getSlot(RegNo) + llvm::X86::ST0;
}
// pushReg - Push the specified FP<n> register onto the stack
void pushReg(unsigned Reg) {
assert(Reg < 8 && "Register number out of range!");
assert(StackTop < 8 && "Stack overflow!");
Stack[StackTop] = Reg;
RegMap[Reg] = StackTop++;
}
bool isAtTop(unsigned RegNo) const { return getSlot(RegNo) == StackTop-1; }
void moveToTop(unsigned RegNo, MachineBasicBlock::iterator &I) {
if (!isAtTop(RegNo)) {
unsigned Slot = getSlot(RegNo);
unsigned STReg = getSTReg(RegNo);
unsigned RegOnTop = getStackEntry(0);
// Swap the slots the regs are in
std::swap(RegMap[RegNo], RegMap[RegOnTop]);
// Swap stack slot contents
assert(RegMap[RegOnTop] < StackTop);
std::swap(Stack[RegMap[RegOnTop]], Stack[StackTop-1]);
// Emit an fxch to update the runtime processors version of the state
BuildMI(*MBB, I, X86::FXCH, 1).addReg(STReg);
NumFXCH++;
}
}
void duplicateToTop(unsigned RegNo, unsigned AsReg, MachineInstr *I) {
unsigned STReg = getSTReg(RegNo);
pushReg(AsReg); // New register on top of stack
BuildMI(*MBB, I, X86::FLDrr, 1).addReg(STReg);
}
// popStackAfter - Pop the current value off of the top of the FP stack
// after the specified instruction.
void popStackAfter(MachineBasicBlock::iterator &I);
// freeStackSlotAfter - Free the specified register from the register stack,
// so that it is no longer in a register. If the register is currently at
// the top of the stack, we just pop the current instruction, otherwise we
// store the current top-of-stack into the specified slot, then pop the top
// of stack.
void freeStackSlotAfter(MachineBasicBlock::iterator &I, unsigned Reg);
bool processBasicBlock(MachineFunction &MF, MachineBasicBlock &MBB);
void handleZeroArgFP(MachineBasicBlock::iterator &I);
void handleOneArgFP(MachineBasicBlock::iterator &I);
void handleOneArgFPRW(MachineBasicBlock::iterator &I);
void handleTwoArgFP(MachineBasicBlock::iterator &I);
void handleCompareFP(MachineBasicBlock::iterator &I);
void handleCondMovFP(MachineBasicBlock::iterator &I);
void handleSpecialFP(MachineBasicBlock::iterator &I);
};
}
FunctionPass *llvm::createX86FloatingPointStackifierPass() { return new FPS(); }
/// runOnMachineFunction - Loop over all of the basic blocks, transforming FP
/// register references into FP stack references.
///
bool FPS::runOnMachineFunction(MachineFunction &MF) {
// We only need to run this pass if there are any FP registers used in this
// function. If it is all integer, there is nothing for us to do!
const bool *PhysRegsUsed = MF.getUsedPhysregs();
bool FPIsUsed = false;
assert(X86::FP6 == X86::FP0+6 && "Register enums aren't sorted right!");
for (unsigned i = 0; i <= 6; ++i)
if (PhysRegsUsed[X86::FP0+i]) {
FPIsUsed = true;
break;
}
// Early exit.
if (!FPIsUsed) return false;
LV = &getAnalysis<LiveVariables>();
StackTop = 0;
// Process the function in depth first order so that we process at least one
// of the predecessors for every reachable block in the function.
std::set<MachineBasicBlock*> Processed;
MachineBasicBlock *Entry = MF.begin();
bool Changed = false;
for (df_ext_iterator<MachineBasicBlock*, std::set<MachineBasicBlock*> >
I = df_ext_begin(Entry, Processed), E = df_ext_end(Entry, Processed);
I != E; ++I)
Changed |= processBasicBlock(MF, **I);
return Changed;
}
/// processBasicBlock - Loop over all of the instructions in the basic block,
/// transforming FP instructions into their stack form.
///
bool FPS::processBasicBlock(MachineFunction &MF, MachineBasicBlock &BB) {
const TargetInstrInfo &TII = *MF.getTarget().getInstrInfo();
bool Changed = false;
MBB = &BB;
for (MachineBasicBlock::iterator I = BB.begin(); I != BB.end(); ++I) {
MachineInstr *MI = I;
unsigned Flags = TII.get(MI->getOpcode()).TSFlags;
if ((Flags & X86II::FPTypeMask) == X86II::NotFP)
continue; // Efficiently ignore non-fp insts!
MachineInstr *PrevMI = 0;
if (I != BB.begin())
PrevMI = prior(I);
++NumFP; // Keep track of # of pseudo instrs
DEBUG(std::cerr << "\nFPInst:\t"; MI->print(std::cerr, &(MF.getTarget())));
// Get dead variables list now because the MI pointer may be deleted as part
// of processing!
LiveVariables::killed_iterator IB, IE;
tie(IB, IE) = LV->dead_range(MI);
DEBUG(
const MRegisterInfo *MRI = MF.getTarget().getRegisterInfo();
LiveVariables::killed_iterator I = LV->killed_begin(MI);
LiveVariables::killed_iterator E = LV->killed_end(MI);
if (I != E) {
std::cerr << "Killed Operands:";
for (; I != E; ++I)
std::cerr << " %" << MRI->getName(*I);
std::cerr << "\n";
}
);
switch (Flags & X86II::FPTypeMask) {
case X86II::ZeroArgFP: handleZeroArgFP(I); break;
case X86II::OneArgFP: handleOneArgFP(I); break; // fstp ST(0)
case X86II::OneArgFPRW: handleOneArgFPRW(I); break; // ST(0) = fsqrt(ST(0))
case X86II::TwoArgFP: handleTwoArgFP(I); break;
case X86II::CompareFP: handleCompareFP(I); break;
case X86II::CondMovFP: handleCondMovFP(I); break;
case X86II::SpecialFP: handleSpecialFP(I); break;
default: assert(0 && "Unknown FP Type!");
}
// Check to see if any of the values defined by this instruction are dead
// after definition. If so, pop them.
for (; IB != IE; ++IB) {
unsigned Reg = *IB;
if (Reg >= X86::FP0 && Reg <= X86::FP6) {
DEBUG(std::cerr << "Register FP#" << Reg-X86::FP0 << " is dead!\n");
freeStackSlotAfter(I, Reg-X86::FP0);
}
}
// Print out all of the instructions expanded to if -debug
DEBUG(
MachineBasicBlock::iterator PrevI(PrevMI);
if (I == PrevI) {
std::cerr << "Just deleted pseudo instruction\n";
} else {
MachineBasicBlock::iterator Start = I;
// Rewind to first instruction newly inserted.
while (Start != BB.begin() && prior(Start) != PrevI) --Start;
std::cerr << "Inserted instructions:\n\t";
Start->print(std::cerr, &MF.getTarget());
while (++Start != next(I));
}
dumpStack();
);
Changed = true;
}
assert(StackTop == 0 && "Stack not empty at end of basic block?");
return Changed;
}
//===----------------------------------------------------------------------===//
// Efficient Lookup Table Support
//===----------------------------------------------------------------------===//
namespace {
struct TableEntry {
unsigned from;
unsigned to;
bool operator<(const TableEntry &TE) const { return from < TE.from; }
friend bool operator<(const TableEntry &TE, unsigned V) {
return TE.from < V;
}
friend bool operator<(unsigned V, const TableEntry &TE) {
return V < TE.from;
}
};
}
static bool TableIsSorted(const TableEntry *Table, unsigned NumEntries) {
for (unsigned i = 0; i != NumEntries-1; ++i)
if (!(Table[i] < Table[i+1])) return false;
return true;
}
static int Lookup(const TableEntry *Table, unsigned N, unsigned Opcode) {
const TableEntry *I = std::lower_bound(Table, Table+N, Opcode);
if (I != Table+N && I->from == Opcode)
return I->to;
return -1;
}
#define ARRAY_SIZE(TABLE) \
(sizeof(TABLE)/sizeof(TABLE[0]))
#ifdef NDEBUG
#define ASSERT_SORTED(TABLE)
#else
#define ASSERT_SORTED(TABLE) \
{ static bool TABLE##Checked = false; \
if (!TABLE##Checked) \
assert(TableIsSorted(TABLE, ARRAY_SIZE(TABLE)) && \
"All lookup tables must be sorted for efficient access!"); \
}
#endif
//===----------------------------------------------------------------------===//
// Register File -> Register Stack Mapping Methods
//===----------------------------------------------------------------------===//
// OpcodeTable - Sorted map of register instructions to their stack version.
// The first element is an register file pseudo instruction, the second is the
// concrete X86 instruction which uses the register stack.
//
static const TableEntry OpcodeTable[] = {
{ X86::FpABS , X86::FABS },
{ X86::FpADD32m , X86::FADD32m },
{ X86::FpADD64m , X86::FADD64m },
{ X86::FpCHS , X86::FCHS },
{ X86::FpCMOVB , X86::FCMOVB },
{ X86::FpCMOVBE , X86::FCMOVBE },
{ X86::FpCMOVE , X86::FCMOVE },
{ X86::FpCMOVNB , X86::FCMOVNB },
{ X86::FpCMOVNBE , X86::FCMOVNBE },
{ X86::FpCMOVNE , X86::FCMOVNE },
{ X86::FpCMOVNP , X86::FCMOVNP },
{ X86::FpCMOVP , X86::FCMOVP },
{ X86::FpCOS , X86::FCOS },
{ X86::FpDIV32m , X86::FDIV32m },
{ X86::FpDIV64m , X86::FDIV64m },
{ X86::FpDIVR32m , X86::FDIVR32m },
{ X86::FpDIVR64m , X86::FDIVR64m },
{ X86::FpIADD16m , X86::FIADD16m },
{ X86::FpIADD32m , X86::FIADD32m },
{ X86::FpIDIV16m , X86::FIDIV16m },
{ X86::FpIDIV32m , X86::FIDIV32m },
{ X86::FpIDIVR16m, X86::FIDIVR16m},
{ X86::FpIDIVR32m, X86::FIDIVR32m},
{ X86::FpILD16m , X86::FILD16m },
{ X86::FpILD32m , X86::FILD32m },
{ X86::FpILD64m , X86::FILD64m },
{ X86::FpIMUL16m , X86::FIMUL16m },
{ X86::FpIMUL32m , X86::FIMUL32m },
{ X86::FpIST16m , X86::FIST16m },
{ X86::FpIST32m , X86::FIST32m },
{ X86::FpIST64m , X86::FISTP64m },
{ X86::FpISTT16m , X86::FISTTP16m},
{ X86::FpISTT32m , X86::FISTTP32m},
{ X86::FpISTT64m , X86::FISTTP64m},
{ X86::FpISUB16m , X86::FISUB16m },
{ X86::FpISUB32m , X86::FISUB32m },
{ X86::FpISUBR16m, X86::FISUBR16m},
{ X86::FpISUBR32m, X86::FISUBR32m},
{ X86::FpLD0 , X86::FLD0 },
{ X86::FpLD1 , X86::FLD1 },
{ X86::FpLD32m , X86::FLD32m },
{ X86::FpLD64m , X86::FLD64m },
{ X86::FpMUL32m , X86::FMUL32m },
{ X86::FpMUL64m , X86::FMUL64m },
{ X86::FpSIN , X86::FSIN },
{ X86::FpSQRT , X86::FSQRT },
{ X86::FpST32m , X86::FST32m },
{ X86::FpST64m , X86::FST64m },
{ X86::FpSUB32m , X86::FSUB32m },
{ X86::FpSUB64m , X86::FSUB64m },
{ X86::FpSUBR32m , X86::FSUBR32m },
{ X86::FpSUBR64m , X86::FSUBR64m },
{ X86::FpTST , X86::FTST },
{ X86::FpUCOMIr , X86::FUCOMIr },
{ X86::FpUCOMr , X86::FUCOMr },
};
static unsigned getConcreteOpcode(unsigned Opcode) {
ASSERT_SORTED(OpcodeTable);
int Opc = Lookup(OpcodeTable, ARRAY_SIZE(OpcodeTable), Opcode);
assert(Opc != -1 && "FP Stack instruction not in OpcodeTable!");
return Opc;
}
//===----------------------------------------------------------------------===//
// Helper Methods
//===----------------------------------------------------------------------===//
// PopTable - Sorted map of instructions to their popping version. The first
// element is an instruction, the second is the version which pops.
//
static const TableEntry PopTable[] = {
{ X86::FADDrST0 , X86::FADDPrST0 },
{ X86::FDIVRrST0, X86::FDIVRPrST0 },
{ X86::FDIVrST0 , X86::FDIVPrST0 },
{ X86::FIST16m , X86::FISTP16m },
{ X86::FIST32m , X86::FISTP32m },
{ X86::FMULrST0 , X86::FMULPrST0 },
{ X86::FST32m , X86::FSTP32m },
{ X86::FST64m , X86::FSTP64m },
{ X86::FSTrr , X86::FSTPrr },
{ X86::FSUBRrST0, X86::FSUBRPrST0 },
{ X86::FSUBrST0 , X86::FSUBPrST0 },
{ X86::FUCOMIr , X86::FUCOMIPr },
{ X86::FUCOMPr , X86::FUCOMPPr },
{ X86::FUCOMr , X86::FUCOMPr },
};
/// popStackAfter - Pop the current value off of the top of the FP stack after
/// the specified instruction. This attempts to be sneaky and combine the pop
/// into the instruction itself if possible. The iterator is left pointing to
/// the last instruction, be it a new pop instruction inserted, or the old
/// instruction if it was modified in place.
///
void FPS::popStackAfter(MachineBasicBlock::iterator &I) {
ASSERT_SORTED(PopTable);
assert(StackTop > 0 && "Cannot pop empty stack!");
RegMap[Stack[--StackTop]] = ~0; // Update state
// Check to see if there is a popping version of this instruction...
int Opcode = Lookup(PopTable, ARRAY_SIZE(PopTable), I->getOpcode());
if (Opcode != -1) {
I->setOpcode(Opcode);
if (Opcode == X86::FUCOMPPr)
I->RemoveOperand(0);
} else { // Insert an explicit pop
I = BuildMI(*MBB, ++I, X86::FSTPrr, 1).addReg(X86::ST0);
}
}
/// freeStackSlotAfter - Free the specified register from the register stack, so
/// that it is no longer in a register. If the register is currently at the top
/// of the stack, we just pop the current instruction, otherwise we store the
/// current top-of-stack into the specified slot, then pop the top of stack.
void FPS::freeStackSlotAfter(MachineBasicBlock::iterator &I, unsigned FPRegNo) {
if (getStackEntry(0) == FPRegNo) { // already at the top of stack? easy.
popStackAfter(I);
return;
}
// Otherwise, store the top of stack into the dead slot, killing the operand
// without having to add in an explicit xchg then pop.
//
unsigned STReg = getSTReg(FPRegNo);
unsigned OldSlot = getSlot(FPRegNo);
unsigned TopReg = Stack[StackTop-1];
Stack[OldSlot] = TopReg;
RegMap[TopReg] = OldSlot;
RegMap[FPRegNo] = ~0;
Stack[--StackTop] = ~0;
I = BuildMI(*MBB, ++I, X86::FSTPrr, 1).addReg(STReg);
}
static unsigned getFPReg(const MachineOperand &MO) {
assert(MO.isRegister() && "Expected an FP register!");
unsigned Reg = MO.getReg();
assert(Reg >= X86::FP0 && Reg <= X86::FP6 && "Expected FP register!");
return Reg - X86::FP0;
}
//===----------------------------------------------------------------------===//
// Instruction transformation implementation
//===----------------------------------------------------------------------===//
/// handleZeroArgFP - ST(0) = fld0 ST(0) = flds <mem>
///
void FPS::handleZeroArgFP(MachineBasicBlock::iterator &I) {
MachineInstr *MI = I;
unsigned DestReg = getFPReg(MI->getOperand(0));
// Change from the pseudo instruction to the concrete instruction.
MI->RemoveOperand(0); // Remove the explicit ST(0) operand
MI->setOpcode(getConcreteOpcode(MI->getOpcode()));
// Result gets pushed on the stack.
pushReg(DestReg);
}
/// handleOneArgFP - fst <mem>, ST(0)
///
void FPS::handleOneArgFP(MachineBasicBlock::iterator &I) {
MachineInstr *MI = I;
assert((MI->getNumOperands() == 5 || MI->getNumOperands() == 1) &&
"Can only handle fst* & ftst instructions!");
// Is this the last use of the source register?
unsigned Reg = getFPReg(MI->getOperand(MI->getNumOperands()-1));
bool KillsSrc = LV->KillsRegister(MI, X86::FP0+Reg);
// FISTP64m is strange because there isn't a non-popping versions.
// If we have one _and_ we don't want to pop the operand, duplicate the value
// on the stack instead of moving it. This ensure that popping the value is
// always ok.
// Ditto FISTTP16m, FISTTP32m, FISTTP64m.
//
if (!KillsSrc &&
(MI->getOpcode() == X86::FpIST64m ||
MI->getOpcode() == X86::FpISTT16m ||
MI->getOpcode() == X86::FpISTT32m ||
MI->getOpcode() == X86::FpISTT64m)) {
duplicateToTop(Reg, 7 /*temp register*/, I);
} else {
moveToTop(Reg, I); // Move to the top of the stack...
}
// Convert from the pseudo instruction to the concrete instruction.
MI->RemoveOperand(MI->getNumOperands()-1); // Remove explicit ST(0) operand
MI->setOpcode(getConcreteOpcode(MI->getOpcode()));
if (MI->getOpcode() == X86::FISTP64m ||
MI->getOpcode() == X86::FISTTP16m ||
MI->getOpcode() == X86::FISTTP32m ||
MI->getOpcode() == X86::FISTTP64m) {
assert(StackTop > 0 && "Stack empty??");
--StackTop;
} else if (KillsSrc) { // Last use of operand?
popStackAfter(I);
}
}
/// handleOneArgFPRW: Handle instructions that read from the top of stack and
/// replace the value with a newly computed value. These instructions may have
/// non-fp operands after their FP operands.
///
/// Examples:
/// R1 = fchs R2
/// R1 = fadd R2, [mem]
///
void FPS::handleOneArgFPRW(MachineBasicBlock::iterator &I) {
MachineInstr *MI = I;
assert(MI->getNumOperands() >= 2 && "FPRW instructions must have 2 ops!!");
// Is this the last use of the source register?
unsigned Reg = getFPReg(MI->getOperand(1));
bool KillsSrc = LV->KillsRegister(MI, X86::FP0+Reg);
if (KillsSrc) {
// If this is the last use of the source register, just make sure it's on
// the top of the stack.
moveToTop(Reg, I);
assert(StackTop > 0 && "Stack cannot be empty!");
--StackTop;
pushReg(getFPReg(MI->getOperand(0)));
} else {
// If this is not the last use of the source register, _copy_ it to the top
// of the stack.
duplicateToTop(Reg, getFPReg(MI->getOperand(0)), I);
}
// Change from the pseudo instruction to the concrete instruction.
MI->RemoveOperand(1); // Drop the source operand.
MI->RemoveOperand(0); // Drop the destination operand.
MI->setOpcode(getConcreteOpcode(MI->getOpcode()));
}
//===----------------------------------------------------------------------===//
// Define tables of various ways to map pseudo instructions
//
// ForwardST0Table - Map: A = B op C into: ST(0) = ST(0) op ST(i)
static const TableEntry ForwardST0Table[] = {
{ X86::FpADD , X86::FADDST0r },
{ X86::FpDIV , X86::FDIVST0r },
{ X86::FpMUL , X86::FMULST0r },
{ X86::FpSUB , X86::FSUBST0r },
};
// ReverseST0Table - Map: A = B op C into: ST(0) = ST(i) op ST(0)
static const TableEntry ReverseST0Table[] = {
{ X86::FpADD , X86::FADDST0r }, // commutative
{ X86::FpDIV , X86::FDIVRST0r },
{ X86::FpMUL , X86::FMULST0r }, // commutative
{ X86::FpSUB , X86::FSUBRST0r },
};
// ForwardSTiTable - Map: A = B op C into: ST(i) = ST(0) op ST(i)
static const TableEntry ForwardSTiTable[] = {
{ X86::FpADD , X86::FADDrST0 }, // commutative
{ X86::FpDIV , X86::FDIVRrST0 },
{ X86::FpMUL , X86::FMULrST0 }, // commutative
{ X86::FpSUB , X86::FSUBRrST0 },
};
// ReverseSTiTable - Map: A = B op C into: ST(i) = ST(i) op ST(0)
static const TableEntry ReverseSTiTable[] = {
{ X86::FpADD , X86::FADDrST0 },
{ X86::FpDIV , X86::FDIVrST0 },
{ X86::FpMUL , X86::FMULrST0 },
{ X86::FpSUB , X86::FSUBrST0 },
};
/// handleTwoArgFP - Handle instructions like FADD and friends which are virtual
/// instructions which need to be simplified and possibly transformed.
///
/// Result: ST(0) = fsub ST(0), ST(i)
/// ST(i) = fsub ST(0), ST(i)
/// ST(0) = fsubr ST(0), ST(i)
/// ST(i) = fsubr ST(0), ST(i)
///
void FPS::handleTwoArgFP(MachineBasicBlock::iterator &I) {
ASSERT_SORTED(ForwardST0Table); ASSERT_SORTED(ReverseST0Table);
ASSERT_SORTED(ForwardSTiTable); ASSERT_SORTED(ReverseSTiTable);
MachineInstr *MI = I;
unsigned NumOperands = MI->getNumOperands();
assert(NumOperands == 3 && "Illegal TwoArgFP instruction!");
unsigned Dest = getFPReg(MI->getOperand(0));
unsigned Op0 = getFPReg(MI->getOperand(NumOperands-2));
unsigned Op1 = getFPReg(MI->getOperand(NumOperands-1));
bool KillsOp0 = LV->KillsRegister(MI, X86::FP0+Op0);
bool KillsOp1 = LV->KillsRegister(MI, X86::FP0+Op1);
unsigned TOS = getStackEntry(0);
// One of our operands must be on the top of the stack. If neither is yet, we
// need to move one.
if (Op0 != TOS && Op1 != TOS) { // No operand at TOS?
// We can choose to move either operand to the top of the stack. If one of
// the operands is killed by this instruction, we want that one so that we
// can update right on top of the old version.
if (KillsOp0) {
moveToTop(Op0, I); // Move dead operand to TOS.
TOS = Op0;
} else if (KillsOp1) {
moveToTop(Op1, I);
TOS = Op1;
} else {
// All of the operands are live after this instruction executes, so we
// cannot update on top of any operand. Because of this, we must
// duplicate one of the stack elements to the top. It doesn't matter
// which one we pick.
//
duplicateToTop(Op0, Dest, I);
Op0 = TOS = Dest;
KillsOp0 = true;
}
} else if (!KillsOp0 && !KillsOp1) {
// If we DO have one of our operands at the top of the stack, but we don't
// have a dead operand, we must duplicate one of the operands to a new slot
// on the stack.
duplicateToTop(Op0, Dest, I);
Op0 = TOS = Dest;
KillsOp0 = true;
}
// Now we know that one of our operands is on the top of the stack, and at
// least one of our operands is killed by this instruction.
assert((TOS == Op0 || TOS == Op1) && (KillsOp0 || KillsOp1) &&
"Stack conditions not set up right!");
// We decide which form to use based on what is on the top of the stack, and
// which operand is killed by this instruction.
const TableEntry *InstTable;
bool isForward = TOS == Op0;
bool updateST0 = (TOS == Op0 && !KillsOp1) || (TOS == Op1 && !KillsOp0);
if (updateST0) {
if (isForward)
InstTable = ForwardST0Table;
else
InstTable = ReverseST0Table;
} else {
if (isForward)
InstTable = ForwardSTiTable;
else
InstTable = ReverseSTiTable;
}
int Opcode = Lookup(InstTable, ARRAY_SIZE(ForwardST0Table), MI->getOpcode());
assert(Opcode != -1 && "Unknown TwoArgFP pseudo instruction!");
// NotTOS - The register which is not on the top of stack...
unsigned NotTOS = (TOS == Op0) ? Op1 : Op0;
// Replace the old instruction with a new instruction
MBB->remove(I++);
I = BuildMI(*MBB, I, Opcode, 1).addReg(getSTReg(NotTOS));
// If both operands are killed, pop one off of the stack in addition to
// overwriting the other one.
if (KillsOp0 && KillsOp1 && Op0 != Op1) {
assert(!updateST0 && "Should have updated other operand!");
popStackAfter(I); // Pop the top of stack
}
// Update stack information so that we know the destination register is now on
// the stack.
unsigned UpdatedSlot = getSlot(updateST0 ? TOS : NotTOS);
assert(UpdatedSlot < StackTop && Dest < 7);
Stack[UpdatedSlot] = Dest;
RegMap[Dest] = UpdatedSlot;
delete MI; // Remove the old instruction
}
/// handleCompareFP - Handle FUCOM and FUCOMI instructions, which have two FP
/// register arguments and no explicit destinations.
///
void FPS::handleCompareFP(MachineBasicBlock::iterator &I) {
ASSERT_SORTED(ForwardST0Table); ASSERT_SORTED(ReverseST0Table);
ASSERT_SORTED(ForwardSTiTable); ASSERT_SORTED(ReverseSTiTable);
MachineInstr *MI = I;
unsigned NumOperands = MI->getNumOperands();
assert(NumOperands == 2 && "Illegal FUCOM* instruction!");
unsigned Op0 = getFPReg(MI->getOperand(NumOperands-2));
unsigned Op1 = getFPReg(MI->getOperand(NumOperands-1));
bool KillsOp0 = LV->KillsRegister(MI, X86::FP0+Op0);
bool KillsOp1 = LV->KillsRegister(MI, X86::FP0+Op1);
// Make sure the first operand is on the top of stack, the other one can be
// anywhere.
moveToTop(Op0, I);
// Change from the pseudo instruction to the concrete instruction.
MI->getOperand(0).setReg(getSTReg(Op1));
MI->RemoveOperand(1);
MI->setOpcode(getConcreteOpcode(MI->getOpcode()));
// If any of the operands are killed by this instruction, free them.
if (KillsOp0) freeStackSlotAfter(I, Op0);
if (KillsOp1 && Op0 != Op1) freeStackSlotAfter(I, Op1);
}
/// handleCondMovFP - Handle two address conditional move instructions. These
/// instructions move a st(i) register to st(0) iff a condition is true. These
/// instructions require that the first operand is at the top of the stack, but
/// otherwise don't modify the stack at all.
void FPS::handleCondMovFP(MachineBasicBlock::iterator &I) {
MachineInstr *MI = I;
unsigned Op0 = getFPReg(MI->getOperand(0));
unsigned Op1 = getFPReg(MI->getOperand(1));
// The first operand *must* be on the top of the stack.
moveToTop(Op0, I);
// Change the second operand to the stack register that the operand is in.
// Change from the pseudo instruction to the concrete instruction.
MI->RemoveOperand(0);
MI->getOperand(0).setReg(getSTReg(Op1));
MI->setOpcode(getConcreteOpcode(MI->getOpcode()));
// If we kill the second operand, make sure to pop it from the stack.
if (Op0 != Op1 && LV->KillsRegister(MI, X86::FP0+Op1)) {
// Get this value off of the register stack.
freeStackSlotAfter(I, Op1);
}
}
/// handleSpecialFP - Handle special instructions which behave unlike other
/// floating point instructions. This is primarily intended for use by pseudo
/// instructions.
///
void FPS::handleSpecialFP(MachineBasicBlock::iterator &I) {
MachineInstr *MI = I;
switch (MI->getOpcode()) {
default: assert(0 && "Unknown SpecialFP instruction!");
case X86::FpGETRESULT: // Appears immediately after a call returning FP type!
assert(StackTop == 0 && "Stack should be empty after a call!");
pushReg(getFPReg(MI->getOperand(0)));
break;
case X86::FpSETRESULT:
assert(StackTop == 1 && "Stack should have one element on it to return!");
--StackTop; // "Forget" we have something on the top of stack!
break;
case X86::FpMOV: {
unsigned SrcReg = getFPReg(MI->getOperand(1));
unsigned DestReg = getFPReg(MI->getOperand(0));
if (LV->KillsRegister(MI, X86::FP0+SrcReg)) {
// If the input operand is killed, we can just change the owner of the
// incoming stack slot into the result.
unsigned Slot = getSlot(SrcReg);
assert(Slot < 7 && DestReg < 7 && "FpMOV operands invalid!");
Stack[Slot] = DestReg;
RegMap[DestReg] = Slot;
} else {
// For FMOV we just duplicate the specified value to a new stack slot.
// This could be made better, but would require substantial changes.
duplicateToTop(SrcReg, DestReg, I);
}
break;
}
}
I = MBB->erase(I); // Remove the pseudo instruction
--I;
}
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