//===-- InstSelectSimple.cpp - A simple instruction selector for SparcV8 --===//
-//
+//
// 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 a simple peephole instruction selector for the V8 target
#include "SparcV8.h"
#include "SparcV8InstrInfo.h"
+#include "llvm/Support/Debug.h"
#include "llvm/Instructions.h"
-#include "llvm/IntrinsicLowering.h"
#include "llvm/Pass.h"
#include "llvm/Constants.h"
+#include "llvm/DerivedTypes.h"
+#include "llvm/CodeGen/IntrinsicLowering.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
+#include "llvm/CodeGen/MachineFrameInfo.h"
+#include "llvm/CodeGen/MachineConstantPool.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/SSARegMap.h"
#include "llvm/Target/TargetMachine.h"
-#include "llvm/Support/GetElementPtrTypeIterator.h"
#include "llvm/Support/InstVisitor.h"
#include "llvm/Support/CFG.h"
using namespace llvm;
TargetMachine &TM;
MachineFunction *F; // The function we are compiling into
MachineBasicBlock *BB; // The current MBB we are compiling
+ int VarArgsOffset; // Offset from fp for start of varargs area
std::map<Value*, unsigned> RegMap; // Mapping between Val's and SSA Regs
return "SparcV8 Simple Instruction Selection";
}
+ /// emitGEPOperation - Common code shared between visitGetElementPtrInst and
+ /// constant expression GEP support.
+ ///
+ void emitGEPOperation(MachineBasicBlock *BB, MachineBasicBlock::iterator IP,
+ Value *Src, User::op_iterator IdxBegin,
+ User::op_iterator IdxEnd, unsigned TargetReg);
+
+ /// emitCastOperation - Common code shared between visitCastInst and
+ /// constant expression cast support.
+ ///
+ void emitCastOperation(MachineBasicBlock *BB,MachineBasicBlock::iterator IP,
+ Value *Src, const Type *DestTy, unsigned TargetReg);
+
+ /// emitIntegerCast, emitFPToIntegerCast - Helper methods for
+ /// emitCastOperation.
+ ///
+ unsigned emitIntegerCast (MachineBasicBlock *BB,
+ MachineBasicBlock::iterator IP,
+ const Type *oldTy, unsigned SrcReg,
+ const Type *newTy, unsigned DestReg,
+ bool castToLong = false);
+ void emitFPToIntegerCast (MachineBasicBlock *BB,
+ MachineBasicBlock::iterator IP, const Type *oldTy,
+ unsigned SrcReg, const Type *newTy,
+ unsigned DestReg);
+
/// visitBasicBlock - This method is called when we are visiting a new basic
/// block. This simply creates a new MachineBasicBlock to emit code into
/// and adds it to the current MachineFunction. Subsequent visit* for
BB = MBBMap[&LLVM_BB];
}
+ void emitOp64LibraryCall (MachineBasicBlock *MBB,
+ MachineBasicBlock::iterator IP,
+ unsigned DestReg, const char *FuncName,
+ unsigned Op0Reg, unsigned Op1Reg);
+ void emitShift64 (MachineBasicBlock *MBB, MachineBasicBlock::iterator IP,
+ Instruction &I, unsigned DestReg, unsigned Op0Reg,
+ unsigned Op1Reg);
void visitBinaryOperator(Instruction &I);
- void visitShiftInstruction(Instruction &I) { visitBinaryOperator(I); }
- void visitSetCondInst(Instruction &I);
+ void visitShiftInst (ShiftInst &SI) { visitBinaryOperator (SI); }
+ void visitSetCondInst(SetCondInst &I);
void visitCallInst(CallInst &I);
- void visitReturnInst(ReturnInst &RI);
+ void visitReturnInst(ReturnInst &I);
+ void visitBranchInst(BranchInst &I);
+ void visitUnreachableInst(UnreachableInst &I) {}
+ void visitCastInst(CastInst &I);
+ void visitVAArgInst(VAArgInst &I);
+ void visitLoadInst(LoadInst &I);
+ void visitStoreInst(StoreInst &I);
+ void visitPHINode(PHINode &I) {} // PHI nodes handled by second pass
+ void visitGetElementPtrInst(GetElementPtrInst &I);
+ void visitAllocaInst(AllocaInst &I);
void visitInstruction(Instruction &I) {
std::cerr << "Unhandled instruction: " << I;
void LowerUnknownIntrinsicFunctionCalls(Function &F);
void visitIntrinsicCall(Intrinsic::ID ID, CallInst &CI);
+ void LoadArgumentsToVirtualRegs(Function *F);
+
+ /// SelectPHINodes - Insert machine code to generate phis. This is tricky
+ /// because we have to generate our sources into the source basic blocks,
+ /// not the current one.
+ ///
+ void SelectPHINodes();
+
/// copyConstantToRegister - Output the instructions required to put the
/// specified constant into the specified register.
///
};
static TypeClass getClass (const Type *T) {
- switch (T->getPrimitiveID ()) {
+ switch (T->getTypeID()) {
case Type::UByteTyID: case Type::SByteTyID: return cByte;
case Type::UShortTyID: case Type::ShortTyID: return cShort;
+ case Type::PointerTyID:
case Type::UIntTyID: case Type::IntTyID: return cInt;
case Type::ULongTyID: case Type::LongTyID: return cLong;
case Type::FloatTyID: return cFloat;
return cByte;
}
}
+
static TypeClass getClassB(const Type *T) {
if (T == Type::BoolTy) return cByte;
return getClass(T);
}
-
-
/// copyConstantToRegister - Output the instructions required to put the
/// specified constant into the specified register.
///
void V8ISel::copyConstantToRegister(MachineBasicBlock *MBB,
MachineBasicBlock::iterator IP,
Constant *C, unsigned R) {
- if (ConstantInt *CI = dyn_cast<ConstantInt> (C)) {
- unsigned Class = getClass(C->getType());
- uint64_t Val = CI->getRawValue ();
- switch (Class) {
- case cByte:
- BuildMI (*MBB, IP, V8::ORri, 2, R).addReg (V8::G0).addImm((uint8_t)Val);
- return;
- case cShort: {
- unsigned TmpReg = makeAnotherReg (C->getType ());
- BuildMI (*MBB, IP, V8::SETHIi, 1, TmpReg)
- .addImm (((uint16_t) Val) >> 10);
- BuildMI (*MBB, IP, V8::ORri, 2, R).addReg (TmpReg)
- .addImm (((uint16_t) Val) & 0x03ff);
- return;
+ if (ConstantExpr *CE = dyn_cast<ConstantExpr>(C)) {
+ switch (CE->getOpcode()) {
+ case Instruction::GetElementPtr:
+ emitGEPOperation(MBB, IP, CE->getOperand(0),
+ CE->op_begin()+1, CE->op_end(), R);
+ return;
+ case Instruction::Cast:
+ emitCastOperation(MBB, IP, CE->getOperand(0), CE->getType(), R);
+ return;
+ default:
+ std::cerr << "Copying this constant expr not yet handled: " << *CE;
+ abort();
+ }
+ } else if (isa<UndefValue>(C)) {
+ BuildMI(*MBB, IP, V8::IMPLICIT_DEF, 0, R);
+ if (getClassB (C->getType ()) == cLong)
+ BuildMI(*MBB, IP, V8::IMPLICIT_DEF, 0, R+1);
+ return;
+ }
+
+ if (C->getType()->isIntegral ()) {
+ unsigned Class = getClassB (C->getType ());
+ if (Class == cLong) {
+ unsigned TmpReg = makeAnotherReg (Type::IntTy);
+ unsigned TmpReg2 = makeAnotherReg (Type::IntTy);
+ // Copy the value into the register pair.
+ // R = top(more-significant) half, R+1 = bottom(less-significant) half
+ uint64_t Val = cast<ConstantInt>(C)->getRawValue();
+ copyConstantToRegister(MBB, IP, ConstantUInt::get(Type::UIntTy,
+ Val >> 32), R);
+ copyConstantToRegister(MBB, IP, ConstantUInt::get(Type::UIntTy,
+ Val & 0xffffffffU), R+1);
+ return;
+ }
+
+ assert(Class <= cInt && "Type not handled yet!");
+ unsigned Val;
+
+ if (C->getType() == Type::BoolTy) {
+ Val = (C == ConstantBool::True);
+ } else {
+ ConstantIntegral *CI = cast<ConstantIntegral> (C);
+ Val = CI->getRawValue();
+ }
+ if (C->getType()->isSigned()) {
+ switch (Class) {
+ case cByte: Val = (int8_t) Val; break;
+ case cShort: Val = (int16_t) Val; break;
+ case cInt: Val = (int32_t) Val; break;
}
- case cInt: {
- unsigned TmpReg = makeAnotherReg (C->getType ());
- BuildMI (*MBB, IP, V8::SETHIi, 1, TmpReg).addImm(((uint32_t)Val) >> 10);
- BuildMI (*MBB, IP, V8::ORri, 2, R).addReg (TmpReg)
- .addImm (((uint32_t) Val) & 0x03ff);
- return;
+ } else {
+ switch (Class) {
+ case cByte: Val = (uint8_t) Val; break;
+ case cShort: Val = (uint16_t) Val; break;
+ case cInt: Val = (uint32_t) Val; break;
}
- case cLong: {
- unsigned TmpReg = makeAnotherReg (Type::UIntTy);
- uint32_t topHalf = (uint32_t) (Val >> 32);
- uint32_t bottomHalf = (uint32_t)Val;
- BuildMI (*MBB, IP, V8::SETHIi, 1, TmpReg).addImm (topHalf >> 10);
- BuildMI (*MBB, IP, V8::ORri, 2, R).addReg (TmpReg)
- .addImm (topHalf & 0x03ff);
- BuildMI (*MBB, IP, V8::SETHIi, 1, TmpReg).addImm (bottomHalf >> 10);
- BuildMI (*MBB, IP, V8::ORri, 2, R).addReg (TmpReg)
- .addImm (bottomHalf & 0x03ff);
- return;
+ }
+ if (Val == 0) {
+ BuildMI (*MBB, IP, V8::ORrr, 2, R).addReg (V8::G0).addReg(V8::G0);
+ } else if ((int)Val >= -4096 && (int)Val <= 4095) {
+ BuildMI (*MBB, IP, V8::ORri, 2, R).addReg (V8::G0).addSImm(Val);
+ } else {
+ unsigned TmpReg = makeAnotherReg (C->getType ());
+ BuildMI (*MBB, IP, V8::SETHIi, 1, TmpReg)
+ .addSImm (((uint32_t) Val) >> 10);
+ BuildMI (*MBB, IP, V8::ORri, 2, R).addReg (TmpReg)
+ .addSImm (((uint32_t) Val) & 0x03ff);
+ return;
+ }
+ } else if (ConstantFP *CFP = dyn_cast<ConstantFP>(C)) {
+ // We need to spill the constant to memory...
+ MachineConstantPool *CP = F->getConstantPool();
+ unsigned CPI = CP->getConstantPoolIndex(CFP);
+ const Type *Ty = CFP->getType();
+ unsigned TmpReg = makeAnotherReg (Type::UIntTy);
+ unsigned AddrReg = makeAnotherReg (Type::UIntTy);
+
+ assert(Ty == Type::FloatTy || Ty == Type::DoubleTy && "Unknown FP type!");
+ unsigned LoadOpcode = Ty == Type::FloatTy ? V8::LDFri : V8::LDDFri;
+ BuildMI (*MBB, IP, V8::SETHIi, 1, TmpReg).addConstantPoolIndex (CPI);
+ BuildMI (*MBB, IP, V8::ORri, 2, AddrReg).addReg (TmpReg)
+ .addConstantPoolIndex (CPI);
+ BuildMI (*MBB, IP, LoadOpcode, 2, R).addReg (AddrReg).addSImm (0);
+ } else if (isa<ConstantPointerNull>(C)) {
+ // Copy zero (null pointer) to the register.
+ BuildMI (*MBB, IP, V8::ORri, 2, R).addReg (V8::G0).addSImm (0);
+ } else if (GlobalValue *GV = dyn_cast<GlobalValue>(C)) {
+ // Copy it with a SETHI/OR pair; the JIT + asmwriter should recognize
+ // that SETHI %reg,global == SETHI %reg,%hi(global) and
+ // OR %reg,global,%reg == OR %reg,%lo(global),%reg.
+ unsigned TmpReg = makeAnotherReg (C->getType ());
+ BuildMI (*MBB, IP, V8::SETHIi, 1, TmpReg).addGlobalAddress(GV);
+ BuildMI (*MBB, IP, V8::ORri, 2, R).addReg(TmpReg).addGlobalAddress(GV);
+ } else {
+ std::cerr << "Offending constant: " << *C << "\n";
+ assert (0 && "Can't copy this kind of constant into register yet");
+ }
+}
+
+void V8ISel::LoadArgumentsToVirtualRegs (Function *LF) {
+ static const unsigned IncomingArgRegs[] = { V8::I0, V8::I1, V8::I2,
+ V8::I3, V8::I4, V8::I5 };
+
+ // Add IMPLICIT_DEFs of input regs.
+ unsigned ArgNo = 0;
+ for (Function::arg_iterator I = LF->arg_begin(), E = LF->arg_end();
+ I != E && ArgNo < 6; ++I, ++ArgNo) {
+ switch (getClassB(I->getType())) {
+ case cByte:
+ case cShort:
+ case cInt:
+ case cFloat:
+ BuildMI(BB, V8::IMPLICIT_DEF, 0, IncomingArgRegs[ArgNo]);
+ break;
+ case cDouble:
+ case cLong:
+ // Double and Long use register pairs.
+ BuildMI(BB, V8::IMPLICIT_DEF, 0, IncomingArgRegs[ArgNo]);
+ ++ArgNo;
+ if (ArgNo < 6)
+ BuildMI(BB, V8::IMPLICIT_DEF, 0, IncomingArgRegs[ArgNo]);
+ break;
+ default:
+ assert (0 && "type not handled");
+ return;
+ }
+ }
+
+ const unsigned *IAREnd = &IncomingArgRegs[6];
+ const unsigned *IAR = &IncomingArgRegs[0];
+ unsigned ArgOffset = 68;
+
+ // Store registers onto stack if this is a varargs function.
+ // FIXME: This doesn't really pertain to "loading arguments into
+ // virtual registers", so it's not clear that it really belongs here.
+ // FIXME: We could avoid storing any args onto the stack that don't
+ // need to be in memory, because they come before the ellipsis in the
+ // parameter list (and thus could never be accessed through va_arg).
+ if (LF->getFunctionType ()->isVarArg ()) {
+ for (unsigned i = 0; i < 6; ++i) {
+ int FI = F->getFrameInfo()->CreateFixedObject(4, ArgOffset);
+ assert (IAR != IAREnd
+ && "About to dereference past end of IncomingArgRegs");
+ BuildMI (BB, V8::ST, 3).addFrameIndex (FI).addSImm (0).addReg (*IAR++);
+ ArgOffset += 4;
+ }
+ // Reset the pointers now that we're done.
+ ArgOffset = 68;
+ IAR = &IncomingArgRegs[0];
+ }
+
+ // Copy args out of their incoming hard regs or stack slots into virtual regs.
+ for (Function::arg_iterator I = LF->arg_begin(), E = LF->arg_end(); I != E; ++I) {
+ Argument &A = *I;
+ unsigned ArgReg = getReg (A);
+ if (getClassB (A.getType ()) < cLong) {
+ // Get it out of the incoming arg register
+ if (ArgOffset < 92) {
+ assert (IAR != IAREnd
+ && "About to dereference past end of IncomingArgRegs");
+ BuildMI (BB, V8::ORrr, 2, ArgReg).addReg (V8::G0).addReg (*IAR++);
+ } else {
+ int FI = F->getFrameInfo()->CreateFixedObject(4, ArgOffset);
+ BuildMI (BB, V8::LD, 3, ArgReg).addFrameIndex (FI).addSImm (0);
}
- default:
- std::cerr << "Offending constant: " << *C << "\n";
- assert (0 && "Can't copy this kind of constant into register yet");
- return;
+ ArgOffset += 4;
+ } else if (getClassB (A.getType ()) == cFloat) {
+ if (ArgOffset < 92) {
+ // Single-fp args are passed in integer registers; go through
+ // memory to get them out of integer registers and back into fp. (Bleh!)
+ unsigned FltAlign = TM.getTargetData().getFloatAlignment();
+ int FI = F->getFrameInfo()->CreateStackObject(4, FltAlign);
+ assert (IAR != IAREnd
+ && "About to dereference past end of IncomingArgRegs");
+ BuildMI (BB, V8::ST, 3).addFrameIndex (FI).addSImm (0).addReg (*IAR++);
+ BuildMI (BB, V8::LDFri, 2, ArgReg).addFrameIndex (FI).addSImm (0);
+ } else {
+ int FI = F->getFrameInfo()->CreateFixedObject(4, ArgOffset);
+ BuildMI (BB, V8::LDFri, 3, ArgReg).addFrameIndex (FI).addSImm (0);
+ }
+ ArgOffset += 4;
+ } else if (getClassB (A.getType ()) == cDouble) {
+ // Double-fp args are passed in pairs of integer registers; go through
+ // memory to get them out of integer registers and back into fp. (Bleh!)
+ // We'd like to 'ldd' these right out of the incoming-args area,
+ // but it might not be 8-byte aligned (e.g., call x(int x, double d)).
+ unsigned DblAlign = TM.getTargetData().getDoubleAlignment();
+ int FI = F->getFrameInfo()->CreateStackObject(8, DblAlign);
+ if (ArgOffset < 92 && IAR != IAREnd) {
+ BuildMI (BB, V8::ST, 3).addFrameIndex (FI).addSImm (0).addReg (*IAR++);
+ } else {
+ unsigned TempReg = makeAnotherReg (Type::IntTy);
+ BuildMI (BB, V8::LD, 2, TempReg).addFrameIndex (FI).addSImm (0);
+ BuildMI (BB, V8::ST, 3).addFrameIndex (FI).addSImm (0).addReg (TempReg);
+ }
+ ArgOffset += 4;
+ if (ArgOffset < 92 && IAR != IAREnd) {
+ BuildMI (BB, V8::ST, 3).addFrameIndex (FI).addSImm (4).addReg (*IAR++);
+ } else {
+ unsigned TempReg = makeAnotherReg (Type::IntTy);
+ BuildMI (BB, V8::LD, 2, TempReg).addFrameIndex (FI).addSImm (4);
+ BuildMI (BB, V8::ST, 3).addFrameIndex (FI).addSImm (4).addReg (TempReg);
+ }
+ ArgOffset += 4;
+ BuildMI (BB, V8::LDDFri, 2, ArgReg).addFrameIndex (FI).addSImm (0);
+ } else if (getClassB (A.getType ()) == cLong) {
+ // do the first half...
+ if (ArgOffset < 92) {
+ assert (IAR != IAREnd
+ && "About to dereference past end of IncomingArgRegs");
+ BuildMI (BB, V8::ORrr, 2, ArgReg).addReg (V8::G0).addReg (*IAR++);
+ } else {
+ int FI = F->getFrameInfo()->CreateFixedObject(4, ArgOffset);
+ BuildMI (BB, V8::LD, 2, ArgReg).addFrameIndex (FI).addSImm (0);
+ }
+ ArgOffset += 4;
+ // ...then do the second half
+ if (ArgOffset < 92) {
+ assert (IAR != IAREnd
+ && "About to dereference past end of IncomingArgRegs");
+ BuildMI (BB, V8::ORrr, 2, ArgReg+1).addReg (V8::G0).addReg (*IAR++);
+ } else {
+ int FI = F->getFrameInfo()->CreateFixedObject(4, ArgOffset);
+ BuildMI (BB, V8::LD, 2, ArgReg+1).addFrameIndex (FI).addSImm (0);
+ }
+ ArgOffset += 4;
+ } else {
+ assert (0 && "Unknown class?!");
}
}
- std::cerr << "Offending constant: " << *C << "\n";
- assert (0 && "Can't copy this kind of constant into register yet");
+ // If the function takes variable number of arguments, remember the fp
+ // offset for the start of the first vararg value... this is used to expand
+ // llvm.va_start.
+ if (LF->getFunctionType ()->isVarArg ())
+ VarArgsOffset = ArgOffset;
+}
+
+void V8ISel::SelectPHINodes() {
+ const TargetInstrInfo &TII = *TM.getInstrInfo();
+ const Function &LF = *F->getFunction(); // The LLVM function...
+ for (Function::const_iterator I = LF.begin(), E = LF.end(); I != E; ++I) {
+ const BasicBlock *BB = I;
+ MachineBasicBlock &MBB = *MBBMap[I];
+
+ // Loop over all of the PHI nodes in the LLVM basic block...
+ MachineBasicBlock::iterator PHIInsertPoint = MBB.begin();
+ for (BasicBlock::const_iterator I = BB->begin();
+ PHINode *PN = const_cast<PHINode*>(dyn_cast<PHINode>(I)); ++I) {
+
+ // Create a new machine instr PHI node, and insert it.
+ unsigned PHIReg = getReg(*PN);
+ MachineInstr *PhiMI = BuildMI(MBB, PHIInsertPoint,
+ V8::PHI, PN->getNumOperands(), PHIReg);
+
+ MachineInstr *LongPhiMI = 0;
+ if (PN->getType() == Type::LongTy || PN->getType() == Type::ULongTy)
+ LongPhiMI = BuildMI(MBB, PHIInsertPoint,
+ V8::PHI, PN->getNumOperands(), PHIReg+1);
+
+ // PHIValues - Map of blocks to incoming virtual registers. We use this
+ // so that we only initialize one incoming value for a particular block,
+ // even if the block has multiple entries in the PHI node.
+ //
+ std::map<MachineBasicBlock*, unsigned> PHIValues;
+
+ for (unsigned i = 0, e = PN->getNumIncomingValues(); i != e; ++i) {
+ MachineBasicBlock *PredMBB = 0;
+ for (MachineBasicBlock::pred_iterator PI = MBB.pred_begin (),
+ PE = MBB.pred_end (); PI != PE; ++PI)
+ if (PN->getIncomingBlock(i) == (*PI)->getBasicBlock()) {
+ PredMBB = *PI;
+ break;
+ }
+ assert (PredMBB && "Couldn't find incoming machine-cfg edge for phi");
+
+ unsigned ValReg;
+ std::map<MachineBasicBlock*, unsigned>::iterator EntryIt =
+ PHIValues.lower_bound(PredMBB);
+
+ if (EntryIt != PHIValues.end() && EntryIt->first == PredMBB) {
+ // We already inserted an initialization of the register for this
+ // predecessor. Recycle it.
+ ValReg = EntryIt->second;
+
+ } else {
+ // Get the incoming value into a virtual register.
+ //
+ Value *Val = PN->getIncomingValue(i);
+
+ // If this is a constant or GlobalValue, we may have to insert code
+ // into the basic block to compute it into a virtual register.
+ if ((isa<Constant>(Val) && !isa<ConstantExpr>(Val)) ||
+ isa<GlobalValue>(Val)) {
+ // Simple constants get emitted at the end of the basic block,
+ // before any terminator instructions. We "know" that the code to
+ // move a constant into a register will never clobber any flags.
+ ValReg = getReg(Val, PredMBB, PredMBB->getFirstTerminator());
+ } else {
+ // Because we don't want to clobber any values which might be in
+ // physical registers with the computation of this constant (which
+ // might be arbitrarily complex if it is a constant expression),
+ // just insert the computation at the top of the basic block.
+ MachineBasicBlock::iterator PI = PredMBB->begin();
+
+ // Skip over any PHI nodes though!
+ while (PI != PredMBB->end() && PI->getOpcode() == V8::PHI)
+ ++PI;
+
+ ValReg = getReg(Val, PredMBB, PI);
+ }
+
+ // Remember that we inserted a value for this PHI for this predecessor
+ PHIValues.insert(EntryIt, std::make_pair(PredMBB, ValReg));
+ }
+
+ PhiMI->addRegOperand(ValReg);
+ PhiMI->addMachineBasicBlockOperand(PredMBB);
+ if (LongPhiMI) {
+ LongPhiMI->addRegOperand(ValReg+1);
+ LongPhiMI->addMachineBasicBlockOperand(PredMBB);
+ }
+ }
+
+ // Now that we emitted all of the incoming values for the PHI node, make
+ // sure to reposition the InsertPoint after the PHI that we just added.
+ // This is needed because we might have inserted a constant into this
+ // block, right after the PHI's which is before the old insert point!
+ PHIInsertPoint = LongPhiMI ? LongPhiMI : PhiMI;
+ ++PHIInsertPoint;
+ }
+ }
}
bool V8ISel::runOnFunction(Function &Fn) {
// First pass over the function, lower any unknown intrinsic functions
// with the IntrinsicLowering class.
LowerUnknownIntrinsicFunctionCalls(Fn);
-
+
F = &MachineFunction::construct(&Fn, TM);
-
+
// Create all of the machine basic blocks for the function...
for (Function::iterator I = Fn.begin(), E = Fn.end(); I != E; ++I)
F->getBasicBlockList().push_back(MBBMap[I] = new MachineBasicBlock(I));
-
+
BB = &F->front();
-
+
// Set up a frame object for the return address. This is used by the
// llvm.returnaddress & llvm.frameaddress intrinisics.
//ReturnAddressIndex = F->getFrameInfo()->CreateFixedObject(4, -4);
-
+
// Copy incoming arguments off of the stack and out of fixed registers.
- //LoadArgumentsToVirtualRegs(Fn);
-
+ LoadArgumentsToVirtualRegs(&Fn);
+
// Instruction select everything except PHI nodes
visit(Fn);
-
+
// Select the PHI nodes
- //SelectPHINodes();
-
+ SelectPHINodes();
+
RegMap.clear();
MBBMap.clear();
F = 0;
return true;
}
+void V8ISel::visitCastInst(CastInst &I) {
+ Value *Op = I.getOperand(0);
+ unsigned DestReg = getReg(I);
+ MachineBasicBlock::iterator MI = BB->end();
+ emitCastOperation(BB, MI, Op, I.getType(), DestReg);
+}
+
+unsigned V8ISel::emitIntegerCast (MachineBasicBlock *BB,
+ MachineBasicBlock::iterator IP, const Type *oldTy,
+ unsigned SrcReg, const Type *newTy,
+ unsigned DestReg, bool castToLong) {
+ unsigned shiftWidth = 32 - (8 * TM.getTargetData ().getTypeSize (newTy));
+ if (oldTy == newTy || (!castToLong && shiftWidth == 0)) {
+ // No-op cast - just emit a copy; assume the reg. allocator will zap it.
+ BuildMI (*BB, IP, V8::ORrr, 2, DestReg).addReg (V8::G0).addReg(SrcReg);
+ return SrcReg;
+ }
+ // Emit left-shift, then right-shift to sign- or zero-extend.
+ unsigned TmpReg = makeAnotherReg (newTy);
+ BuildMI (*BB, IP, V8::SLLri, 2, TmpReg).addZImm (shiftWidth).addReg(SrcReg);
+ if (newTy->isSigned ()) { // sign-extend with SRA
+ BuildMI(*BB, IP, V8::SRAri, 2, DestReg).addZImm (shiftWidth).addReg(TmpReg);
+ } else { // zero-extend with SRL
+ BuildMI(*BB, IP, V8::SRLri, 2, DestReg).addZImm (shiftWidth).addReg(TmpReg);
+ }
+ // Return the temp reg. in case this is one half of a cast to long.
+ return TmpReg;
+}
+
+void V8ISel::emitFPToIntegerCast (MachineBasicBlock *BB,
+ MachineBasicBlock::iterator IP,
+ const Type *oldTy, unsigned SrcReg,
+ const Type *newTy, unsigned DestReg) {
+ unsigned FPCastOpcode, FPStoreOpcode, FPSize, FPAlign;
+ unsigned oldTyClass = getClassB(oldTy);
+ if (oldTyClass == cFloat) {
+ FPCastOpcode = V8::FSTOI; FPStoreOpcode = V8::STFri; FPSize = 4;
+ FPAlign = TM.getTargetData().getFloatAlignment();
+ } else { // it's a double
+ FPCastOpcode = V8::FDTOI; FPStoreOpcode = V8::STDFri; FPSize = 8;
+ FPAlign = TM.getTargetData().getDoubleAlignment();
+ }
+ unsigned TempReg = makeAnotherReg (oldTy);
+ BuildMI (*BB, IP, FPCastOpcode, 1, TempReg).addReg (SrcReg);
+ int FI = F->getFrameInfo()->CreateStackObject(FPSize, FPAlign);
+ BuildMI (*BB, IP, FPStoreOpcode, 3).addFrameIndex (FI).addSImm (0)
+ .addReg (TempReg);
+ unsigned TempReg2 = makeAnotherReg (newTy);
+ BuildMI (*BB, IP, V8::LD, 3, TempReg2).addFrameIndex (FI).addSImm (0);
+ emitIntegerCast (BB, IP, Type::IntTy, TempReg2, newTy, DestReg);
+}
+
+/// emitCastOperation - Common code shared between visitCastInst and constant
+/// expression cast support.
+///
+void V8ISel::emitCastOperation(MachineBasicBlock *BB,
+ MachineBasicBlock::iterator IP, Value *Src,
+ const Type *DestTy, unsigned DestReg) {
+ const Type *SrcTy = Src->getType();
+ unsigned SrcClass = getClassB(SrcTy);
+ unsigned DestClass = getClassB(DestTy);
+ unsigned SrcReg = getReg(Src, BB, IP);
+
+ const Type *oldTy = SrcTy;
+ const Type *newTy = DestTy;
+ unsigned oldTyClass = SrcClass;
+ unsigned newTyClass = DestClass;
+
+ if (oldTyClass < cLong && newTyClass < cLong) {
+ emitIntegerCast (BB, IP, oldTy, SrcReg, newTy, DestReg);
+ } else switch (newTyClass) {
+ case cByte:
+ case cShort:
+ case cInt:
+ switch (oldTyClass) {
+ case cLong:
+ // Treat it like a cast from the lower half of the value.
+ emitIntegerCast (BB, IP, Type::IntTy, SrcReg+1, newTy, DestReg);
+ break;
+ case cFloat:
+ case cDouble:
+ emitFPToIntegerCast (BB, IP, oldTy, SrcReg, newTy, DestReg);
+ break;
+ default: goto not_yet;
+ }
+ return;
+
+ case cFloat:
+ switch (oldTyClass) {
+ case cLong: goto not_yet;
+ case cFloat:
+ BuildMI (*BB, IP, V8::FMOVS, 1, DestReg).addReg (SrcReg);
+ break;
+ case cDouble:
+ BuildMI (*BB, IP, V8::FDTOS, 1, DestReg).addReg (SrcReg);
+ break;
+ default: {
+ unsigned FltAlign = TM.getTargetData().getFloatAlignment();
+ // cast integer type to float. Store it to a stack slot and then load
+ // it using ldf into a floating point register. then do fitos.
+ unsigned TmpReg = makeAnotherReg (newTy);
+ int FI = F->getFrameInfo()->CreateStackObject(4, FltAlign);
+ BuildMI (*BB, IP, V8::ST, 3).addFrameIndex (FI).addSImm (0)
+ .addReg (SrcReg);
+ BuildMI (*BB, IP, V8::LDFri, 2, TmpReg).addFrameIndex (FI).addSImm (0);
+ BuildMI (*BB, IP, V8::FITOS, 1, DestReg).addReg(TmpReg);
+ break;
+ }
+ }
+ return;
+
+ case cDouble:
+ switch (oldTyClass) {
+ case cLong: goto not_yet;
+ case cFloat:
+ BuildMI (*BB, IP, V8::FSTOD, 1, DestReg).addReg (SrcReg);
+ break;
+ case cDouble: // use double move pseudo-instr
+ BuildMI (*BB, IP, V8::FpMOVD, 1, DestReg).addReg (SrcReg);
+ break;
+ default: {
+ unsigned DoubleAlignment = TM.getTargetData().getDoubleAlignment();
+ unsigned TmpReg = makeAnotherReg (newTy);
+ int FI = F->getFrameInfo()->CreateStackObject(8, DoubleAlignment);
+ BuildMI (*BB, IP, V8::ST, 3).addFrameIndex (FI).addSImm (0)
+ .addReg (SrcReg);
+ BuildMI (*BB, IP, V8::LDDFri, 2, TmpReg).addFrameIndex (FI).addSImm (0);
+ BuildMI (*BB, IP, V8::FITOD, 1, DestReg).addReg(TmpReg);
+ break;
+ }
+ }
+ return;
+
+ case cLong:
+ switch (oldTyClass) {
+ case cByte:
+ case cShort:
+ case cInt: {
+ // Cast to (u)int in the bottom half, and sign(zero) extend in the top
+ // half.
+ const Type *OldHalfTy = oldTy->isSigned() ? Type::IntTy : Type::UIntTy;
+ const Type *NewHalfTy = newTy->isSigned() ? Type::IntTy : Type::UIntTy;
+ unsigned TempReg = emitIntegerCast (BB, IP, OldHalfTy, SrcReg,
+ NewHalfTy, DestReg+1, true);
+ if (newTy->isSigned ()) {
+ BuildMI (*BB, IP, V8::SRAri, 2, DestReg).addReg (TempReg)
+ .addZImm (31);
+ } else {
+ BuildMI (*BB, IP, V8::ORrr, 2, DestReg).addReg (V8::G0)
+ .addReg (V8::G0);
+ }
+ break;
+ }
+ case cLong:
+ // Just copy both halves.
+ BuildMI (*BB, IP, V8::ORrr, 2, DestReg).addReg (V8::G0).addReg (SrcReg);
+ BuildMI (*BB, IP, V8::ORrr, 2, DestReg+1).addReg (V8::G0)
+ .addReg (SrcReg+1);
+ break;
+ default: goto not_yet;
+ }
+ return;
+
+ default: goto not_yet;
+ }
+ return;
+not_yet:
+ std::cerr << "Sorry, cast still unsupported: SrcTy = " << *SrcTy
+ << ", DestTy = " << *DestTy << "\n";
+ abort ();
+}
+
+void V8ISel::visitLoadInst(LoadInst &I) {
+ unsigned DestReg = getReg (I);
+ unsigned PtrReg = getReg (I.getOperand (0));
+ switch (getClassB (I.getType ())) {
+ case cByte:
+ if (I.getType ()->isSigned ())
+ BuildMI (BB, V8::LDSB, 2, DestReg).addReg (PtrReg).addSImm(0);
+ else
+ BuildMI (BB, V8::LDUB, 2, DestReg).addReg (PtrReg).addSImm(0);
+ return;
+ case cShort:
+ if (I.getType ()->isSigned ())
+ BuildMI (BB, V8::LDSH, 2, DestReg).addReg (PtrReg).addSImm(0);
+ else
+ BuildMI (BB, V8::LDUH, 2, DestReg).addReg (PtrReg).addSImm(0);
+ return;
+ case cInt:
+ BuildMI (BB, V8::LD, 2, DestReg).addReg (PtrReg).addSImm(0);
+ return;
+ case cLong:
+ BuildMI (BB, V8::LD, 2, DestReg).addReg (PtrReg).addSImm(0);
+ BuildMI (BB, V8::LD, 2, DestReg+1).addReg (PtrReg).addSImm(4);
+ return;
+ case cFloat:
+ BuildMI (BB, V8::LDFri, 2, DestReg).addReg (PtrReg).addSImm(0);
+ return;
+ case cDouble:
+ BuildMI (BB, V8::LDDFri, 2, DestReg).addReg (PtrReg).addSImm(0);
+ return;
+ default:
+ std::cerr << "Load instruction not handled: " << I;
+ abort ();
+ return;
+ }
+}
+
+void V8ISel::visitStoreInst(StoreInst &I) {
+ Value *SrcVal = I.getOperand (0);
+ unsigned SrcReg = getReg (SrcVal);
+ unsigned PtrReg = getReg (I.getOperand (1));
+ switch (getClassB (SrcVal->getType ())) {
+ case cByte:
+ BuildMI (BB, V8::STB, 3).addReg (PtrReg).addSImm (0).addReg (SrcReg);
+ return;
+ case cShort:
+ BuildMI (BB, V8::STH, 3).addReg (PtrReg).addSImm (0).addReg (SrcReg);
+ return;
+ case cInt:
+ BuildMI (BB, V8::ST, 3).addReg (PtrReg).addSImm (0).addReg (SrcReg);
+ return;
+ case cLong:
+ BuildMI (BB, V8::ST, 3).addReg (PtrReg).addSImm (0).addReg (SrcReg);
+ BuildMI (BB, V8::ST, 3).addReg (PtrReg).addSImm (4).addReg (SrcReg+1);
+ return;
+ case cFloat:
+ BuildMI (BB, V8::STFri, 3).addReg (PtrReg).addSImm (0).addReg (SrcReg);
+ return;
+ case cDouble:
+ BuildMI (BB, V8::STDFri, 3).addReg (PtrReg).addSImm (0).addReg (SrcReg);
+ return;
+ default:
+ std::cerr << "Store instruction not handled: " << I;
+ abort ();
+ return;
+ }
+}
+
void V8ISel::visitCallInst(CallInst &I) {
- assert (I.getNumOperands () < 8
- && "Can't handle pushing excess call args on the stack yet");
- static const unsigned IncomingArgRegs[] = { V8::O0, V8::O1, V8::O2, V8::O3,
+ MachineInstr *TheCall;
+ // Is it an intrinsic function call?
+ if (Function *F = I.getCalledFunction()) {
+ if (Intrinsic::ID ID = (Intrinsic::ID)F->getIntrinsicID()) {
+ visitIntrinsicCall(ID, I); // Special intrinsics are not handled here
+ return;
+ }
+ }
+
+ // How much extra call stack will we need?
+ int extraStack = 0;
+ for (unsigned i = 0; i < I.getNumOperands (); ++i) {
+ switch (getClassB (I.getOperand (i)->getType ())) {
+ case cLong: extraStack += 8; break;
+ case cFloat: extraStack += 4; break;
+ case cDouble: extraStack += 8; break;
+ default: extraStack += 4; break;
+ }
+ }
+ extraStack -= 24;
+ if (extraStack < 0) {
+ extraStack = 0;
+ } else {
+ // Round up extra stack size to the nearest doubleword.
+ extraStack = (extraStack + 7) & ~7;
+ }
+
+ // Deal with args
+ static const unsigned OutgoingArgRegs[] = { V8::O0, V8::O1, V8::O2, V8::O3,
V8::O4, V8::O5 };
- for (unsigned i = 1; i < 7; ++i)
- if (i < I.getNumOperands ()) {
- unsigned ArgReg = getReg (I.getOperand (i));
+ const unsigned *OAREnd = &OutgoingArgRegs[6];
+ const unsigned *OAR = &OutgoingArgRegs[0];
+ unsigned ArgOffset = 68;
+ if (extraStack) BuildMI (BB, V8::ADJCALLSTACKDOWN, 1).addImm (extraStack);
+ for (unsigned i = 1; i < I.getNumOperands (); ++i) {
+ unsigned ArgReg = getReg (I.getOperand (i));
+ if (getClassB (I.getOperand (i)->getType ()) < cLong) {
// Schlep it over into the incoming arg register
- BuildMI (BB, V8::ORrr, 2, IncomingArgRegs[i]).addReg (V8::G0)
- .addReg (ArgReg);
+ if (ArgOffset < 92) {
+ assert (OAR != OAREnd &&
+ "About to dereference past end of OutgoingArgRegs");
+ BuildMI (BB, V8::ORrr, 2, *OAR++).addReg (V8::G0).addReg (ArgReg);
+ } else {
+ BuildMI (BB, V8::ST, 3).addReg (V8::SP).addSImm (ArgOffset)
+ .addReg (ArgReg);
+ }
+ ArgOffset += 4;
+ } else if (getClassB (I.getOperand (i)->getType ()) == cFloat) {
+ if (ArgOffset < 92) {
+ // Single-fp args are passed in integer registers; go through
+ // memory to get them out of FP registers. (Bleh!)
+ unsigned FltAlign = TM.getTargetData().getFloatAlignment();
+ int FI = F->getFrameInfo()->CreateStackObject(4, FltAlign);
+ BuildMI (BB, V8::STFri, 3).addFrameIndex(FI).addSImm(0).addReg(ArgReg);
+ assert (OAR != OAREnd &&
+ "About to dereference past end of OutgoingArgRegs");
+ BuildMI (BB, V8::LD, 2, *OAR++).addFrameIndex (FI).addSImm (0);
+ } else {
+ BuildMI (BB, V8::STFri, 3).addReg (V8::SP).addSImm (ArgOffset)
+ .addReg (ArgReg);
+ }
+ ArgOffset += 4;
+ } else if (getClassB (I.getOperand (i)->getType ()) == cDouble) {
+ // Double-fp args are passed in pairs of integer registers; go through
+ // memory to get them out of FP registers. (Bleh!)
+ // We'd like to 'std' these right onto the outgoing-args area, but it might
+ // not be 8-byte aligned (e.g., call x(int x, double d)). sigh.
+ unsigned DblAlign = TM.getTargetData().getDoubleAlignment();
+ int FI = F->getFrameInfo()->CreateStackObject(8, DblAlign);
+ BuildMI (BB, V8::STDFri, 3).addFrameIndex (FI).addSImm (0).addReg (ArgReg);
+ if (ArgOffset < 92 && OAR != OAREnd) {
+ assert (OAR != OAREnd &&
+ "About to dereference past end of OutgoingArgRegs");
+ BuildMI (BB, V8::LD, 2, *OAR++).addFrameIndex (FI).addSImm (0);
+ } else {
+ unsigned TempReg = makeAnotherReg (Type::IntTy);
+ BuildMI (BB, V8::LD, 2, TempReg).addFrameIndex (FI).addSImm (0);
+ BuildMI (BB, V8::ST, 3).addReg (V8::SP).addSImm (ArgOffset)
+ .addReg (TempReg);
+ }
+ ArgOffset += 4;
+ if (ArgOffset < 92 && OAR != OAREnd) {
+ assert (OAR != OAREnd &&
+ "About to dereference past end of OutgoingArgRegs");
+ BuildMI (BB, V8::LD, 2, *OAR++).addFrameIndex (FI).addSImm (4);
+ } else {
+ unsigned TempReg = makeAnotherReg (Type::IntTy);
+ BuildMI (BB, V8::LD, 2, TempReg).addFrameIndex (FI).addSImm (4);
+ BuildMI (BB, V8::ST, 3).addReg (V8::SP).addSImm (ArgOffset)
+ .addReg (TempReg);
+ }
+ ArgOffset += 4;
+ } else if (getClassB (I.getOperand (i)->getType ()) == cLong) {
+ // do the first half...
+ if (ArgOffset < 92) {
+ assert (OAR != OAREnd &&
+ "About to dereference past end of OutgoingArgRegs");
+ BuildMI (BB, V8::ORrr, 2, *OAR++).addReg (V8::G0).addReg (ArgReg);
+ } else {
+ BuildMI (BB, V8::ST, 3).addReg (V8::SP).addSImm (ArgOffset)
+ .addReg (ArgReg);
+ }
+ ArgOffset += 4;
+ // ...then do the second half
+ if (ArgOffset < 92) {
+ assert (OAR != OAREnd &&
+ "About to dereference past end of OutgoingArgRegs");
+ BuildMI (BB, V8::ORrr, 2, *OAR++).addReg (V8::G0).addReg (ArgReg+1);
+ } else {
+ BuildMI (BB, V8::ST, 3).addReg (V8::SP).addSImm (ArgOffset)
+ .addReg (ArgReg+1);
+ }
+ ArgOffset += 4;
+ } else {
+ assert (0 && "Unknown class?!");
}
+ }
- unsigned DestReg = getReg (I);
- BuildMI (BB, V8::CALL, 1).addPCDisp (I.getOperand (0));
- if (I.getType ()->getPrimitiveID () == Type::VoidTyID)
+ // Emit call instruction
+ if (Function *F = I.getCalledFunction ()) {
+ BuildMI (BB, V8::CALL, 1).addGlobalAddress (F, true);
+ } else { // Emit an indirect call...
+ unsigned Reg = getReg (I.getCalledValue ());
+ BuildMI (BB, V8::JMPLrr, 3, V8::O7).addReg (Reg).addReg (V8::G0);
+ }
+
+ if (extraStack) BuildMI (BB, V8::ADJCALLSTACKUP, 1).addImm (extraStack);
+
+ // Deal w/ return value: schlep it over into the destination register
+ if (I.getType () == Type::VoidTy)
return;
- // Deal w/ return value
- switch (getClass (I.getType ())) {
+ unsigned DestReg = getReg (I);
+ switch (getClassB (I.getType ())) {
case cByte:
case cShort:
case cInt:
- // Schlep it over into the destination register
BuildMI (BB, V8::ORrr, 2, DestReg).addReg(V8::G0).addReg(V8::O0);
break;
+ case cFloat:
+ BuildMI (BB, V8::FMOVS, 2, DestReg).addReg(V8::F0);
+ break;
+ case cDouble:
+ BuildMI (BB, V8::FpMOVD, 2, DestReg).addReg(V8::D0);
+ break;
+ case cLong:
+ BuildMI (BB, V8::ORrr, 2, DestReg).addReg(V8::G0).addReg(V8::O0);
+ BuildMI (BB, V8::ORrr, 2, DestReg+1).addReg(V8::G0).addReg(V8::O1);
+ break;
default:
- visitInstruction (I);
- return;
+ std::cerr << "Return type of call instruction not handled: " << I;
+ abort ();
}
}
void V8ISel::visitReturnInst(ReturnInst &I) {
if (I.getNumOperands () == 1) {
unsigned RetValReg = getReg (I.getOperand (0));
- switch (getClass (I.getOperand (0)->getType ())) {
+ switch (getClassB (I.getOperand (0)->getType ())) {
case cByte:
case cShort:
case cInt:
// Schlep it over into i0 (where it will become o0 after restore).
BuildMI (BB, V8::ORrr, 2, V8::I0).addReg(V8::G0).addReg(RetValReg);
break;
+ case cFloat:
+ BuildMI (BB, V8::FMOVS, 1, V8::F0).addReg(RetValReg);
+ break;
+ case cDouble:
+ BuildMI (BB, V8::FpMOVD, 1, V8::D0).addReg(RetValReg);
+ break;
+ case cLong:
+ BuildMI (BB, V8::ORrr, 2, V8::I0).addReg(V8::G0).addReg(RetValReg);
+ BuildMI (BB, V8::ORrr, 2, V8::I1).addReg(V8::G0).addReg(RetValReg+1);
+ break;
default:
- visitInstruction (I);
- return;
+ std::cerr << "Return instruction of this type not handled: " << I;
+ abort ();
}
}
return;
}
+static inline BasicBlock *getBlockAfter(BasicBlock *BB) {
+ Function::iterator I = BB; ++I; // Get iterator to next block
+ return I != BB->getParent()->end() ? &*I : 0;
+}
+
+/// canFoldSetCCIntoBranch - Return the setcc instruction if we can fold it
+/// into the conditional branch which is the only user of the cc instruction.
+/// This is the case if the conditional branch is the only user of the setcc.
+///
+static SetCondInst *canFoldSetCCIntoBranch(Value *V) {
+ //return 0; // disable.
+ if (SetCondInst *SCI = dyn_cast<SetCondInst>(V))
+ if (SCI->hasOneUse()) {
+ BranchInst *User = dyn_cast<BranchInst>(SCI->use_back());
+ if (User
+ && (SCI->getNext() == User)
+ && (getClassB(SCI->getOperand(0)->getType()) != cLong)
+ && User->isConditional() && (User->getCondition() == V))
+ return SCI;
+ }
+ return 0;
+}
+
+/// visitBranchInst - Handles conditional and unconditional branches.
+///
+void V8ISel::visitBranchInst(BranchInst &I) {
+ BasicBlock *takenSucc = I.getSuccessor (0);
+ MachineBasicBlock *takenSuccMBB = MBBMap[takenSucc];
+ BB->addSuccessor (takenSuccMBB);
+ if (I.isConditional()) { // conditional branch
+ BasicBlock *notTakenSucc = I.getSuccessor (1);
+ MachineBasicBlock *notTakenSuccMBB = MBBMap[notTakenSucc];
+ BB->addSuccessor (notTakenSuccMBB);
+
+ // See if we can fold a previous setcc instr into this branch.
+ SetCondInst *SCI = canFoldSetCCIntoBranch(I.getCondition());
+ if (SCI == 0) {
+ // The condition did not come from a setcc which we could fold.
+ // CondReg=(<condition>);
+ // If (CondReg==0) goto notTakenSuccMBB;
+ unsigned CondReg = getReg (I.getCondition ());
+ BuildMI (BB, V8::CMPri, 2).addSImm (0).addReg (CondReg);
+ BuildMI (BB, V8::BE, 1).addMBB (notTakenSuccMBB);
+ BuildMI (BB, V8::BA, 1).addMBB (takenSuccMBB);
+ return;
+ }
+
+ // Fold the setCC instr into the branch.
+ unsigned Op0Reg = getReg (SCI->getOperand (0));
+ unsigned Op1Reg = getReg (SCI->getOperand (1));
+ const Type *Ty = SCI->getOperand (0)->getType ();
+
+ // Compare the two values.
+ if (getClass (Ty) < cLong) {
+ BuildMI(BB, V8::SUBCCrr, 2, V8::G0).addReg(Op0Reg).addReg(Op1Reg);
+ } else if (getClass (Ty) == cLong) {
+ assert (0 && "Can't fold setcc long/ulong into branch");
+ } else if (getClass (Ty) == cFloat) {
+ BuildMI(BB, V8::FCMPS, 2).addReg(Op0Reg).addReg(Op1Reg);
+ } else if (getClass (Ty) == cDouble) {
+ BuildMI(BB, V8::FCMPD, 2).addReg(Op0Reg).addReg(Op1Reg);
+ }
+
+ unsigned BranchIdx;
+ switch (SCI->getOpcode()) {
+ default: assert(0 && "Unknown setcc instruction!");
+ case Instruction::SetEQ: BranchIdx = 0; break;
+ case Instruction::SetNE: BranchIdx = 1; break;
+ case Instruction::SetLT: BranchIdx = 2; break;
+ case Instruction::SetGT: BranchIdx = 3; break;
+ case Instruction::SetLE: BranchIdx = 4; break;
+ case Instruction::SetGE: BranchIdx = 5; break;
+ }
+
+ unsigned Column = 0;
+ if (Ty->isSigned() && !Ty->isFloatingPoint()) Column = 1;
+ if (Ty->isFloatingPoint()) Column = 2;
+ static unsigned OpcodeTab[3*6] = {
+ // LLVM SparcV8
+ // unsigned signed fp
+ V8::BE, V8::BE, V8::FBE, // seteq = be be fbe
+ V8::BNE, V8::BNE, V8::FBNE, // setne = bne bne fbne
+ V8::BCS, V8::BL, V8::FBL, // setlt = bcs bl fbl
+ V8::BGU, V8::BG, V8::FBG, // setgt = bgu bg fbg
+ V8::BLEU, V8::BLE, V8::FBLE, // setle = bleu ble fble
+ V8::BCC, V8::BGE, V8::FBGE // setge = bcc bge fbge
+ };
+ unsigned Opcode = OpcodeTab[3*BranchIdx + Column];
+ BuildMI (BB, Opcode, 1).addMBB (takenSuccMBB);
+ BuildMI (BB, V8::BA, 1).addMBB (notTakenSuccMBB);
+ } else {
+ // goto takenSuccMBB;
+ BuildMI (BB, V8::BA, 1).addMBB (takenSuccMBB);
+ }
+}
+
+/// emitGEPOperation - Common code shared between visitGetElementPtrInst and
+/// constant expression GEP support.
+///
+void V8ISel::emitGEPOperation (MachineBasicBlock *MBB,
+ MachineBasicBlock::iterator IP,
+ Value *Src, User::op_iterator IdxBegin,
+ User::op_iterator IdxEnd, unsigned TargetReg) {
+ const TargetData &TD = TM.getTargetData ();
+ const Type *Ty = Src->getType ();
+ unsigned basePtrReg = getReg (Src, MBB, IP);
+
+ // GEPs have zero or more indices; we must perform a struct access
+ // or array access for each one.
+ for (GetElementPtrInst::op_iterator oi = IdxBegin, oe = IdxEnd; oi != oe;
+ ++oi) {
+ Value *idx = *oi;
+ unsigned nextBasePtrReg = makeAnotherReg (Type::UIntTy);
+ if (const StructType *StTy = dyn_cast<StructType> (Ty)) {
+ // It's a struct access. idx is the index into the structure,
+ // which names the field. Use the TargetData structure to
+ // pick out what the layout of the structure is in memory.
+ // Use the (constant) structure index's value to find the
+ // right byte offset from the StructLayout class's list of
+ // structure member offsets.
+ unsigned fieldIndex = cast<ConstantUInt> (idx)->getValue ();
+ unsigned memberOffset =
+ TD.getStructLayout (StTy)->MemberOffsets[fieldIndex];
+ // Emit an ADD to add memberOffset to the basePtr.
+ // We might have to copy memberOffset into a register first, if
+ // it's big.
+ if (memberOffset + 4096 < 8191) {
+ BuildMI (*MBB, IP, V8::ADDri, 2,
+ nextBasePtrReg).addReg (basePtrReg).addSImm (memberOffset);
+ } else {
+ unsigned offsetReg = makeAnotherReg (Type::IntTy);
+ copyConstantToRegister (MBB, IP,
+ ConstantSInt::get(Type::IntTy, memberOffset), offsetReg);
+ BuildMI (*MBB, IP, V8::ADDrr, 2,
+ nextBasePtrReg).addReg (basePtrReg).addReg (offsetReg);
+ }
+ // The next type is the member of the structure selected by the
+ // index.
+ Ty = StTy->getElementType (fieldIndex);
+ } else if (const SequentialType *SqTy = dyn_cast<SequentialType> (Ty)) {
+ // It's an array or pointer access: [ArraySize x ElementType].
+ // We want to add basePtrReg to (idxReg * sizeof ElementType). First, we
+ // must find the size of the pointed-to type (Not coincidentally, the next
+ // type is the type of the elements in the array).
+ Ty = SqTy->getElementType ();
+ unsigned elementSize = TD.getTypeSize (Ty);
+ unsigned OffsetReg = ~0U;
+ int64_t Offset = -1;
+ bool addImmed = false;
+ if (isa<ConstantIntegral> (idx)) {
+ // If idx is a constant, we don't have to emit the multiply.
+ int64_t Val = cast<ConstantIntegral> (idx)->getRawValue ();
+ if ((Val * elementSize) + 4096 < 8191) {
+ // (Val * elementSize) is constant and fits in an immediate field.
+ // emit: nextBasePtrReg = ADDri basePtrReg, (Val * elementSize)
+ addImmed = true;
+ Offset = Val * elementSize;
+ } else {
+ // (Val * elementSize) is constant, but doesn't fit in an immediate
+ // field. emit: OffsetReg = (Val * elementSize)
+ // nextBasePtrReg = ADDrr OffsetReg, basePtrReg
+ OffsetReg = makeAnotherReg (Type::IntTy);
+ copyConstantToRegister (MBB, IP,
+ ConstantSInt::get(Type::IntTy, Val * elementSize), OffsetReg);
+ }
+ } else {
+ // idx is not constant, we have to shift or multiply.
+ OffsetReg = makeAnotherReg (Type::IntTy);
+ unsigned idxReg = getReg (idx, MBB, IP);
+ switch (elementSize) {
+ case 1:
+ BuildMI (*MBB, IP, V8::ORrr, 2, OffsetReg).addReg (V8::G0).addReg (idxReg);
+ break;
+ case 2:
+ BuildMI (*MBB, IP, V8::SLLri, 2, OffsetReg).addReg (idxReg).addZImm (1);
+ break;
+ case 4:
+ BuildMI (*MBB, IP, V8::SLLri, 2, OffsetReg).addReg (idxReg).addZImm (2);
+ break;
+ case 8:
+ BuildMI (*MBB, IP, V8::SLLri, 2, OffsetReg).addReg (idxReg).addZImm (3);
+ break;
+ default: {
+ if (elementSize + 4096 < 8191) {
+ // Emit a SMUL to multiply the register holding the index by
+ // elementSize, putting the result in OffsetReg.
+ BuildMI (*MBB, IP, V8::SMULri, 2,
+ OffsetReg).addReg (idxReg).addSImm (elementSize);
+ } else {
+ unsigned elementSizeReg = makeAnotherReg (Type::UIntTy);
+ copyConstantToRegister (MBB, IP,
+ ConstantUInt::get(Type::UIntTy, elementSize), elementSizeReg);
+ // Emit a SMUL to multiply the register holding the index by
+ // the register w/ elementSize, putting the result in OffsetReg.
+ BuildMI (*MBB, IP, V8::SMULrr, 2,
+ OffsetReg).addReg (idxReg).addReg (elementSizeReg);
+ }
+ break;
+ }
+ }
+ }
+ if (addImmed) {
+ // Emit an ADD to add the constant immediate Offset to the basePtr.
+ BuildMI (*MBB, IP, V8::ADDri, 2,
+ nextBasePtrReg).addReg (basePtrReg).addSImm (Offset);
+ } else {
+ // Emit an ADD to add OffsetReg to the basePtr.
+ BuildMI (*MBB, IP, V8::ADDrr, 2,
+ nextBasePtrReg).addReg (basePtrReg).addReg (OffsetReg);
+ }
+ }
+ basePtrReg = nextBasePtrReg;
+ }
+ // After we have processed all the indices, the result is left in
+ // basePtrReg. Move it to the register where we were expected to
+ // put the answer.
+ BuildMI (BB, V8::ORrr, 1, TargetReg).addReg (V8::G0).addReg (basePtrReg);
+}
+
+void V8ISel::visitGetElementPtrInst (GetElementPtrInst &I) {
+ unsigned outputReg = getReg (I);
+ emitGEPOperation (BB, BB->end (), I.getOperand (0),
+ I.op_begin ()+1, I.op_end (), outputReg);
+}
+
+void V8ISel::emitOp64LibraryCall (MachineBasicBlock *MBB,
+ MachineBasicBlock::iterator IP,
+ unsigned DestReg,
+ const char *FuncName,
+ unsigned Op0Reg, unsigned Op1Reg) {
+ BuildMI (*MBB, IP, V8::ORrr, 2, V8::O0).addReg (V8::G0).addReg (Op0Reg);
+ BuildMI (*MBB, IP, V8::ORrr, 2, V8::O1).addReg (V8::G0).addReg (Op0Reg+1);
+ BuildMI (*MBB, IP, V8::ORrr, 2, V8::O2).addReg (V8::G0).addReg (Op1Reg);
+ BuildMI (*MBB, IP, V8::ORrr, 2, V8::O3).addReg (V8::G0).addReg (Op1Reg+1);
+ BuildMI (*MBB, IP, V8::CALL, 1).addExternalSymbol (FuncName, true);
+ BuildMI (*MBB, IP, V8::ORrr, 2, DestReg).addReg (V8::G0).addReg (V8::O0);
+ BuildMI (*MBB, IP, V8::ORrr, 2, DestReg+1).addReg (V8::G0).addReg (V8::O1);
+}
+
+void V8ISel::emitShift64 (MachineBasicBlock *MBB,
+ MachineBasicBlock::iterator IP, Instruction &I,
+ unsigned DestReg, unsigned SrcReg,
+ unsigned ShiftAmtReg) {
+ bool isSigned = I.getType()->isSigned();
+
+ switch (I.getOpcode ()) {
+ case Instruction::Shr: {
+ unsigned CarryReg = makeAnotherReg (Type::IntTy),
+ ThirtyTwo = makeAnotherReg (Type::IntTy),
+ HalfShiftReg = makeAnotherReg (Type::IntTy),
+ NegHalfShiftReg = makeAnotherReg (Type::IntTy),
+ TempReg = makeAnotherReg (Type::IntTy);
+ unsigned OneShiftOutReg = makeAnotherReg (Type::ULongTy),
+ TwoShiftsOutReg = makeAnotherReg (Type::ULongTy);
+
+ MachineBasicBlock *thisMBB = BB;
+ const BasicBlock *LLVM_BB = BB->getBasicBlock ();
+ MachineBasicBlock *shiftMBB = new MachineBasicBlock (LLVM_BB);
+ F->getBasicBlockList ().push_back (shiftMBB);
+ MachineBasicBlock *oneShiftMBB = new MachineBasicBlock (LLVM_BB);
+ F->getBasicBlockList ().push_back (oneShiftMBB);
+ MachineBasicBlock *twoShiftsMBB = new MachineBasicBlock (LLVM_BB);
+ F->getBasicBlockList ().push_back (twoShiftsMBB);
+ MachineBasicBlock *continueMBB = new MachineBasicBlock (LLVM_BB);
+ F->getBasicBlockList ().push_back (continueMBB);
+
+ // .lshr_begin:
+ // ...
+ // subcc %g0, ShiftAmtReg, %g0 ! Is ShAmt == 0?
+ // be .lshr_continue ! Then don't shift.
+ // ba .lshr_shift ! else shift.
+
+ BuildMI (BB, V8::SUBCCrr, 2, V8::G0).addReg (V8::G0)
+ .addReg (ShiftAmtReg);
+ BuildMI (BB, V8::BE, 1).addMBB (continueMBB);
+ BuildMI (BB, V8::BA, 1).addMBB (shiftMBB);
+
+ // Update machine-CFG edges
+ BB->addSuccessor (continueMBB);
+ BB->addSuccessor (shiftMBB);
+
+ // .lshr_shift: ! [preds: begin]
+ // or %g0, 32, ThirtyTwo
+ // subcc ThirtyTwo, ShiftAmtReg, HalfShiftReg ! Calculate 32 - shamt
+ // bg .lshr_two_shifts ! If >0, b two_shifts
+ // ba .lshr_one_shift ! else one_shift.
+
+ BB = shiftMBB;
+
+ BuildMI (BB, V8::ORri, 2, ThirtyTwo).addReg (V8::G0).addSImm (32);
+ BuildMI (BB, V8::SUBCCrr, 2, HalfShiftReg).addReg (ThirtyTwo)
+ .addReg (ShiftAmtReg);
+ BuildMI (BB, V8::BG, 1).addMBB (twoShiftsMBB);
+ BuildMI (BB, V8::BA, 1).addMBB (oneShiftMBB);
+
+ // Update machine-CFG edges
+ BB->addSuccessor (twoShiftsMBB);
+ BB->addSuccessor (oneShiftMBB);
+
+ // .lshr_two_shifts: ! [preds: shift]
+ // sll SrcReg, HalfShiftReg, CarryReg ! Save the borrows
+ // ! <SHIFT> in following is sra if signed, srl if unsigned
+ // <SHIFT> SrcReg, ShiftAmtReg, TwoShiftsOutReg ! Shift top half
+ // srl SrcReg+1, ShiftAmtReg, TempReg ! Shift bottom half
+ // or TempReg, CarryReg, TwoShiftsOutReg+1 ! Restore the borrows
+ // ba .lshr_continue
+ unsigned ShiftOpcode = (isSigned ? V8::SRArr : V8::SRLrr);
+
+ BB = twoShiftsMBB;
+
+ BuildMI (BB, V8::SLLrr, 2, CarryReg).addReg (SrcReg)
+ .addReg (HalfShiftReg);
+ BuildMI (BB, ShiftOpcode, 2, TwoShiftsOutReg).addReg (SrcReg)
+ .addReg (ShiftAmtReg);
+ BuildMI (BB, V8::SRLrr, 2, TempReg).addReg (SrcReg+1)
+ .addReg (ShiftAmtReg);
+ BuildMI (BB, V8::ORrr, 2, TwoShiftsOutReg+1).addReg (TempReg)
+ .addReg (CarryReg);
+ BuildMI (BB, V8::BA, 1).addMBB (continueMBB);
+
+ // Update machine-CFG edges
+ BB->addSuccessor (continueMBB);
+
+ // .lshr_one_shift: ! [preds: shift]
+ // ! if unsigned:
+ // or %g0, %g0, OneShiftOutReg ! Zero top half
+ // ! or, if signed:
+ // sra SrcReg, 31, OneShiftOutReg ! Sign-ext top half
+ // sub %g0, HalfShiftReg, NegHalfShiftReg ! Make ShiftAmt >0
+ // <SHIFT> SrcReg, NegHalfShiftReg, OneShiftOutReg+1 ! Shift bottom half
+ // ba .lshr_continue
+
+ BB = oneShiftMBB;
+
+ if (isSigned)
+ BuildMI (BB, V8::SRAri, 2, OneShiftOutReg).addReg (SrcReg).addZImm (31);
+ else
+ BuildMI (BB, V8::ORrr, 2, OneShiftOutReg).addReg (V8::G0)
+ .addReg (V8::G0);
+ BuildMI (BB, V8::SUBrr, 2, NegHalfShiftReg).addReg (V8::G0)
+ .addReg (HalfShiftReg);
+ BuildMI (BB, ShiftOpcode, 2, OneShiftOutReg+1).addReg (SrcReg)
+ .addReg (NegHalfShiftReg);
+ BuildMI (BB, V8::BA, 1).addMBB (continueMBB);
+
+ // Update machine-CFG edges
+ BB->addSuccessor (continueMBB);
+
+ // .lshr_continue: ! [preds: begin, do_one_shift, do_two_shifts]
+ // phi (SrcReg, begin), (TwoShiftsOutReg, two_shifts),
+ // (OneShiftOutReg, one_shift), DestReg ! Phi top half...
+ // phi (SrcReg+1, begin), (TwoShiftsOutReg+1, two_shifts),
+ // (OneShiftOutReg+1, one_shift), DestReg+1 ! And phi bottom half.
+
+ BB = continueMBB;
+ BuildMI (BB, V8::PHI, 6, DestReg).addReg (SrcReg).addMBB (thisMBB)
+ .addReg (TwoShiftsOutReg).addMBB (twoShiftsMBB)
+ .addReg (OneShiftOutReg).addMBB (oneShiftMBB);
+ BuildMI (BB, V8::PHI, 6, DestReg+1).addReg (SrcReg+1).addMBB (thisMBB)
+ .addReg (TwoShiftsOutReg+1).addMBB (twoShiftsMBB)
+ .addReg (OneShiftOutReg+1).addMBB (oneShiftMBB);
+ return;
+ }
+ case Instruction::Shl:
+ default:
+ std::cerr << "Sorry, 64-bit shifts are not yet supported:\n" << I;
+ abort ();
+ }
+}
+
void V8ISel::visitBinaryOperator (Instruction &I) {
unsigned DestReg = getReg (I);
unsigned Op0Reg = getReg (I.getOperand (0));
- unsigned Op1Reg = getReg (I.getOperand (1));
+
+ unsigned Class = getClassB (I.getType());
+ unsigned OpCase = ~0;
+
+ if (Class > cLong) {
+ unsigned Op1Reg = getReg (I.getOperand (1));
+ switch (I.getOpcode ()) {
+ case Instruction::Add: OpCase = 0; break;
+ case Instruction::Sub: OpCase = 1; break;
+ case Instruction::Mul: OpCase = 2; break;
+ case Instruction::Div: OpCase = 3; break;
+ default: visitInstruction (I); return;
+ }
+ static unsigned Opcodes[] = { V8::FADDS, V8::FADDD,
+ V8::FSUBS, V8::FSUBD,
+ V8::FMULS, V8::FMULD,
+ V8::FDIVS, V8::FDIVD };
+ BuildMI (BB, Opcodes[2*OpCase + (Class - cFloat)], 2, DestReg)
+ .addReg (Op0Reg).addReg (Op1Reg);
+ return;
+ }
unsigned ResultReg = DestReg;
- if (getClassB(I.getType()) != cInt)
+ if (Class != cInt && Class != cLong)
ResultReg = makeAnotherReg (I.getType ());
- unsigned OpCase = ~0;
- // FIXME: support long, ulong, fp.
+ if (Class == cLong) {
+ const char *FuncName;
+ unsigned Op1Reg = getReg (I.getOperand (1));
+ DEBUG (std::cerr << "Class = cLong\n");
+ DEBUG (std::cerr << "Op0Reg = " << Op0Reg << ", " << Op0Reg+1 << "\n");
+ DEBUG (std::cerr << "Op1Reg = " << Op1Reg << ", " << Op1Reg+1 << "\n");
+ DEBUG (std::cerr << "ResultReg = " << ResultReg << ", " << ResultReg+1 << "\n");
+ DEBUG (std::cerr << "DestReg = " << DestReg << ", " << DestReg+1 << "\n");
+ switch (I.getOpcode ()) {
+ case Instruction::Add:
+ BuildMI (BB, V8::ADDCCrr, 2, ResultReg+1).addReg (Op0Reg+1)
+ .addReg (Op1Reg+1);
+ BuildMI (BB, V8::ADDXrr, 2, ResultReg).addReg (Op0Reg).addReg (Op1Reg);
+ return;
+ case Instruction::Sub:
+ BuildMI (BB, V8::SUBCCrr, 2, ResultReg+1).addReg (Op0Reg+1)
+ .addReg (Op1Reg+1);
+ BuildMI (BB, V8::SUBXrr, 2, ResultReg).addReg (Op0Reg).addReg (Op1Reg);
+ return;
+ case Instruction::Mul:
+ FuncName = I.getType ()->isSigned () ? "__mul64" : "__umul64";
+ emitOp64LibraryCall (BB, BB->end (), DestReg, FuncName, Op0Reg, Op1Reg);
+ return;
+ case Instruction::Div:
+ FuncName = I.getType ()->isSigned () ? "__div64" : "__udiv64";
+ emitOp64LibraryCall (BB, BB->end (), DestReg, FuncName, Op0Reg, Op1Reg);
+ return;
+ case Instruction::Rem:
+ FuncName = I.getType ()->isSigned () ? "__rem64" : "__urem64";
+ emitOp64LibraryCall (BB, BB->end (), DestReg, FuncName, Op0Reg, Op1Reg);
+ return;
+ case Instruction::Shl:
+ case Instruction::Shr:
+ emitShift64 (BB, BB->end (), I, DestReg, Op0Reg, Op1Reg);
+ return;
+ }
+ }
+
switch (I.getOpcode ()) {
case Instruction::Add: OpCase = 0; break;
case Instruction::Sub: OpCase = 1; break;
case Instruction::Div:
case Instruction::Rem: {
unsigned Dest = ResultReg;
+ unsigned Op1Reg = getReg (I.getOperand (1));
if (I.getOpcode() == Instruction::Rem)
Dest = makeAnotherReg(I.getType());
return;
}
+ static const unsigned Opcodes[] = {
+ V8::ADDrr, V8::SUBrr, V8::SMULrr, V8::ANDrr, V8::ORrr, V8::XORrr,
+ V8::SLLrr, V8::SRLrr, V8::SRArr
+ };
+ static const unsigned OpcodesRI[] = {
+ V8::ADDri, V8::SUBri, V8::SMULri, V8::ANDri, V8::ORri, V8::XORri,
+ V8::SLLri, V8::SRLri, V8::SRAri
+ };
+ unsigned Op1Reg = ~0U;
if (OpCase != ~0U) {
- static const unsigned Opcodes[] = {
- V8::ADDrr, V8::SUBrr, V8::SMULrr, V8::ANDrr, V8::ORrr, V8::XORrr,
- V8::SLLrr, V8::SRLrr, V8::SRArr
- };
- BuildMI (BB, Opcodes[OpCase], 2, ResultReg).addReg (Op0Reg).addReg (Op1Reg);
+ Value *Arg1 = I.getOperand (1);
+ bool useImmed = false;
+ int64_t Val = 0;
+ if ((getClassB (I.getType ()) <= cInt) && (isa<ConstantIntegral> (Arg1))) {
+ Val = cast<ConstantIntegral> (Arg1)->getRawValue ();
+ useImmed = (Val > -4096 && Val < 4095);
+ }
+ if (useImmed) {
+ BuildMI (BB, OpcodesRI[OpCase], 2, ResultReg).addReg (Op0Reg).addSImm (Val);
+ } else {
+ Op1Reg = getReg (I.getOperand (1));
+ BuildMI (BB, Opcodes[OpCase], 2, ResultReg).addReg (Op0Reg).addReg (Op1Reg);
+ }
}
- switch (getClass (I.getType ())) {
- case cByte:
+ switch (getClassB (I.getType ())) {
+ case cByte:
if (I.getType ()->isSigned ()) { // add byte
BuildMI (BB, V8::ANDri, 2, DestReg).addReg (ResultReg).addZImm (0xff);
} else { // add ubyte
}
break;
case cInt:
- // Nothing todo here.
+ // Nothing to do here.
+ break;
+ case cLong: {
+ // Only support and, or, xor here - others taken care of above.
+ if (OpCase < 3 || OpCase > 5) {
+ visitInstruction (I);
+ return;
+ }
+ // Do the other half of the value:
+ BuildMI (BB, Opcodes[OpCase], 2, ResultReg+1).addReg (Op0Reg+1)
+ .addReg (Op1Reg+1);
break;
+ }
default:
visitInstruction (I);
- return;
}
}
-void V8ISel::visitSetCondInst(Instruction &I) {
+void V8ISel::visitSetCondInst(SetCondInst &I) {
+ if (canFoldSetCCIntoBranch(&I))
+ return; // Fold this into a branch.
+
unsigned Op0Reg = getReg (I.getOperand (0));
unsigned Op1Reg = getReg (I.getOperand (1));
unsigned DestReg = getReg (I);
-
- // Compare the two values.
- BuildMI(BB, V8::SUBCCrr, 2, V8::G0).addReg(Op0Reg).addReg(Op1Reg);
+ const Type *Ty = I.getOperand (0)->getType ();
- // Put 0 into a register.
- //unsigned ZeroReg = makeAnotheRReg(Type::IntTy);
- //BuildMI(BB, V8::ORri, 2, ZeroReg).addReg(V8::G0).addReg(V8::G0);
+ // Compare the two values.
+ if (getClass (Ty) < cLong) {
+ BuildMI(BB, V8::SUBCCrr, 2, V8::G0).addReg(Op0Reg).addReg(Op1Reg);
+ } else if (getClass (Ty) == cLong) {
+ switch (I.getOpcode()) {
+ default: assert(0 && "Unknown setcc instruction!");
+ case Instruction::SetEQ:
+ case Instruction::SetNE: {
+ unsigned TempReg0 = makeAnotherReg (Type::IntTy),
+ TempReg1 = makeAnotherReg (Type::IntTy),
+ TempReg2 = makeAnotherReg (Type::IntTy),
+ TempReg3 = makeAnotherReg (Type::IntTy);
+ MachineOpCode Opcode;
+ int Immed;
+ // These guys are special - no branches needed!
+ BuildMI (BB, V8::XORrr, 2, TempReg0).addReg (Op0Reg+1).addReg (Op1Reg+1);
+ BuildMI (BB, V8::XORrr, 2, TempReg1).addReg (Op0Reg).addReg (Op1Reg);
+ BuildMI (BB, V8::SUBCCrr, 2, V8::G0).addReg (V8::G0).addReg (TempReg1);
+ Opcode = I.getOpcode() == Instruction::SetEQ ? V8::SUBXri : V8::ADDXri;
+ Immed = I.getOpcode() == Instruction::SetEQ ? -1 : 0;
+ BuildMI (BB, Opcode, 2, TempReg2).addReg (V8::G0).addSImm (Immed);
+ BuildMI (BB, V8::SUBCCrr, 2, V8::G0).addReg (V8::G0).addReg (TempReg0);
+ BuildMI (BB, Opcode, 2, TempReg3).addReg (V8::G0).addSImm (Immed);
+ Opcode = I.getOpcode() == Instruction::SetEQ ? V8::ANDrr : V8::ORrr;
+ BuildMI (BB, Opcode, 2, DestReg).addReg (TempReg2).addReg (TempReg3);
+ return;
+ }
+ case Instruction::SetLT:
+ case Instruction::SetGE:
+ BuildMI (BB, V8::SUBCCrr, 2, V8::G0).addReg (Op0Reg+1).addReg (Op1Reg+1);
+ BuildMI (BB, V8::SUBXCCrr, 2, V8::G0).addReg (Op0Reg).addReg (Op1Reg);
+ break;
+ case Instruction::SetGT:
+ case Instruction::SetLE:
+ BuildMI (BB, V8::SUBCCri, 2, V8::G0).addReg (V8::G0).addSImm (1);
+ BuildMI (BB, V8::SUBXCCrr, 2, V8::G0).addReg (Op0Reg+1).addReg (Op1Reg+1);
+ BuildMI (BB, V8::SUBXCCrr, 2, V8::G0).addReg (Op0Reg).addReg (Op1Reg);
+ break;
+ }
+ } else if (getClass (Ty) == cFloat) {
+ BuildMI(BB, V8::FCMPS, 2).addReg(Op0Reg).addReg(Op1Reg);
+ } else if (getClass (Ty) == cDouble) {
+ BuildMI(BB, V8::FCMPD, 2).addReg(Op0Reg).addReg(Op1Reg);
+ }
- unsigned Opcode;
+ unsigned BranchIdx;
switch (I.getOpcode()) {
default: assert(0 && "Unknown setcc instruction!");
- case Instruction::SetEQ:
- case Instruction::SetNE:
- case Instruction::SetLT:
- case Instruction::SetGT:
- case Instruction::SetLE:
- case Instruction::SetGE:
- ;
- }
-
- // FIXME: We need either conditional moves like the V9 has (e.g. movge), or we
- // need to be able to turn a single LLVM basic block into multiple machine
- // code basic blocks. For now, it probably makes sense to emit Sparc V9
- // instructions until the code generator is upgraded. Note that this should
- // only happen when the setcc cannot be folded into the branch, but this needs
- // to be handled correctly!
-
- visitInstruction(I);
+ case Instruction::SetEQ: BranchIdx = 0; break;
+ case Instruction::SetNE: BranchIdx = 1; break;
+ case Instruction::SetLT: BranchIdx = 2; break;
+ case Instruction::SetGT: BranchIdx = 3; break;
+ case Instruction::SetLE: BranchIdx = 4; break;
+ case Instruction::SetGE: BranchIdx = 5; break;
+ }
+
+ unsigned Column = 0;
+ if (Ty->isSigned() && !Ty->isFloatingPoint()) Column = 1;
+ if (Ty->isFloatingPoint()) Column = 2;
+ static unsigned OpcodeTab[3*6] = {
+ // LLVM SparcV8
+ // unsigned signed fp
+ V8::BE, V8::BE, V8::FBE, // seteq = be be fbe
+ V8::BNE, V8::BNE, V8::FBNE, // setne = bne bne fbne
+ V8::BCS, V8::BL, V8::FBL, // setlt = bcs bl fbl
+ V8::BGU, V8::BG, V8::FBG, // setgt = bgu bg fbg
+ V8::BLEU, V8::BLE, V8::FBLE, // setle = bleu ble fble
+ V8::BCC, V8::BGE, V8::FBGE // setge = bcc bge fbge
+ };
+ unsigned Opcode = OpcodeTab[3*BranchIdx + Column];
+
+ MachineBasicBlock *thisMBB = BB;
+ const BasicBlock *LLVM_BB = BB->getBasicBlock ();
+ // thisMBB:
+ // ...
+ // subcc %reg0, %reg1, %g0
+ // TrueVal = or G0, 1
+ // bCC sinkMBB
+
+ unsigned TrueValue = makeAnotherReg (I.getType ());
+ BuildMI (BB, V8::ORri, 2, TrueValue).addReg (V8::G0).addZImm (1);
+
+ MachineBasicBlock *copy0MBB = new MachineBasicBlock (LLVM_BB);
+ MachineBasicBlock *sinkMBB = new MachineBasicBlock (LLVM_BB);
+ BuildMI (BB, Opcode, 1).addMBB (sinkMBB);
+
+ // Update machine-CFG edges
+ BB->addSuccessor (sinkMBB);
+ BB->addSuccessor (copy0MBB);
+
+ // copy0MBB:
+ // %FalseValue = or %G0, 0
+ // # fall through
+ BB = copy0MBB;
+ F->getBasicBlockList ().push_back (BB);
+ unsigned FalseValue = makeAnotherReg (I.getType ());
+ BuildMI (BB, V8::ORrr, 2, FalseValue).addReg (V8::G0).addReg (V8::G0);
+
+ // Update machine-CFG edges
+ BB->addSuccessor (sinkMBB);
+
+ DEBUG (std::cerr << "thisMBB is at " << (void*)thisMBB << "\n");
+ DEBUG (std::cerr << "copy0MBB is at " << (void*)copy0MBB << "\n");
+ DEBUG (std::cerr << "sinkMBB is at " << (void*)sinkMBB << "\n");
+
+ // sinkMBB:
+ // %Result = phi [ %FalseValue, copy0MBB ], [ %TrueValue, thisMBB ]
+ // ...
+ BB = sinkMBB;
+ F->getBasicBlockList ().push_back (BB);
+ BuildMI (BB, V8::PHI, 4, DestReg).addReg (FalseValue)
+ .addMBB (copy0MBB).addReg (TrueValue).addMBB (thisMBB);
}
+void V8ISel::visitAllocaInst(AllocaInst &I) {
+ // Find the data size of the alloca inst's getAllocatedType.
+ const Type *Ty = I.getAllocatedType();
+ unsigned TySize = TM.getTargetData().getTypeSize(Ty);
+
+ unsigned ArraySizeReg = getReg (I.getArraySize ());
+ unsigned TySizeReg = getReg (ConstantUInt::get (Type::UIntTy, TySize));
+ unsigned TmpReg1 = makeAnotherReg (Type::UIntTy);
+ unsigned TmpReg2 = makeAnotherReg (Type::UIntTy);
+ unsigned StackAdjReg = makeAnotherReg (Type::UIntTy);
+
+ // StackAdjReg = (ArraySize * TySize) rounded up to nearest
+ // doubleword boundary.
+ BuildMI (BB, V8::UMULrr, 2, TmpReg1).addReg (ArraySizeReg).addReg (TySizeReg);
+
+ // Round up TmpReg1 to nearest doubleword boundary:
+ BuildMI (BB, V8::ADDri, 2, TmpReg2).addReg (TmpReg1).addSImm (7);
+ BuildMI (BB, V8::ANDri, 2, StackAdjReg).addReg (TmpReg2).addSImm (-8);
+
+ // Subtract size from stack pointer, thereby allocating some space.
+ BuildMI (BB, V8::SUBrr, 2, V8::SP).addReg (V8::SP).addReg (StackAdjReg);
+ // Put a pointer to the space into the result register, by copying
+ // the stack pointer.
+ BuildMI (BB, V8::ADDri, 2, getReg(I)).addReg (V8::SP).addSImm (96);
+
+ // Inform the Frame Information that we have just allocated a variable-sized
+ // object.
+ F->getFrameInfo()->CreateVariableSizedObject();
+}
/// LowerUnknownIntrinsicFunctionCalls - This performs a prepass over the
/// function, lowering any calls to unknown intrinsic functions into the
if (CallInst *CI = dyn_cast<CallInst>(I++))
if (Function *F = CI->getCalledFunction())
switch (F->getIntrinsicID()) {
+ case Intrinsic::vastart:
+ case Intrinsic::vacopy:
+ case Intrinsic::vaend:
+ // We directly implement these intrinsics
case Intrinsic::not_intrinsic: break;
default:
// All other intrinsic calls we must lower.
void V8ISel::visitIntrinsicCall(Intrinsic::ID ID, CallInst &CI) {
- unsigned TmpReg1, TmpReg2;
switch (ID) {
- default: assert(0 && "Intrinsic not supported!");
+ default:
+ std::cerr << "Sorry, unknown intrinsic function call:\n" << CI; abort ();
+
+ case Intrinsic::vastart: {
+ // Add the VarArgsOffset to the frame pointer, and copy it to the result.
+ unsigned DestReg = getReg (CI.getOperand(1));
+ unsigned Tmp = makeAnotherReg(Type::IntTy);
+ BuildMI (BB, V8::ADDri, 2, Tmp).addReg (V8::FP).addSImm (VarArgsOffset);
+ BuildMI(BB, V8::ST, 3).addReg(DestReg).addSImm(0).addReg(Tmp);
+ return;
}
+
+ case Intrinsic::vaend:
+ // va_end is a no-op on SparcV8.
+ return;
+
+ case Intrinsic::vacopy: {
+ // Copy the va_list ptr (arg1) to the result.
+ unsigned DestReg = getReg (CI.getOperand(1)), SrcReg = getReg (CI.getOperand (2));
+ BuildMI(BB, V8::ST, 3).addReg(DestReg).addSImm(0).addReg(SrcReg);
+ return;
+ }
+ }
+}
+
+void V8ISel::visitVAArgInst (VAArgInst &I) {
+ unsigned VAListPtr = getReg (I.getOperand (0));
+ unsigned DestReg = getReg (I);
+ unsigned Size;
+ unsigned VAList = makeAnotherReg(Type::IntTy);
+ BuildMI(BB, V8::LD, 2, VAList).addReg(VAListPtr).addSImm(0);
+
+ switch (I.getType ()->getTypeID ()) {
+ case Type::PointerTyID:
+ case Type::UIntTyID:
+ case Type::IntTyID:
+ Size = 4;
+ BuildMI (BB, V8::LD, 2, DestReg).addReg (VAList).addSImm (0);
+ break;
+
+ case Type::ULongTyID:
+ case Type::LongTyID:
+ Size = 8;
+ BuildMI (BB, V8::LD, 2, DestReg).addReg (VAList).addSImm (0);
+ BuildMI (BB, V8::LD, 2, DestReg+1).addReg (VAList).addSImm (4);
+ break;
+
+ case Type::DoubleTyID: {
+ Size = 8;
+ unsigned DblAlign = TM.getTargetData().getDoubleAlignment();
+ unsigned TempReg = makeAnotherReg (Type::IntTy);
+ unsigned TempReg2 = makeAnotherReg (Type::IntTy);
+ int FI = F->getFrameInfo()->CreateStackObject(8, DblAlign);
+ BuildMI (BB, V8::LD, 2, TempReg).addReg (VAList).addSImm (0);
+ BuildMI (BB, V8::LD, 2, TempReg2).addReg (VAList).addSImm (4);
+ BuildMI (BB, V8::ST, 3).addFrameIndex (FI).addSImm (0).addReg (TempReg);
+ BuildMI (BB, V8::ST, 3).addFrameIndex (FI).addSImm (4).addReg (TempReg2);
+ BuildMI (BB, V8::LDDFri, 2, DestReg).addFrameIndex (FI).addSImm (0);
+ break;
+ }
+
+ default:
+ std::cerr << "Sorry, vaarg instruction of this type still unsupported:\n"
+ << I;
+ abort ();
+ return;
+ }
+ unsigned tmp = makeAnotherReg(Type::IntTy);
+ BuildMI (BB, V8::ADDri, 2, tmp).addReg(VAList).addSImm(Size);
+ BuildMI(BB, V8::ST, 3).addReg(VAListPtr).addSImm(0).addReg(VAList);
+ return;
}
projects / oota-llvm.git / blobdiff