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Support add - note, still missing important copyConstantToRegister stuff 

llvm-svn: 12106
This commit is contained in:
Brian Gaeke 2004-03-03 23:03:14 +00:00
parent 559487301f
commit 165ff998e0
2 changed files with 161 additions and 4 deletions
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151
llvm/lib/Target/SparcV8/InstSelectSimple.cpp
View File

@ -12,11 +12,14 @@
//===----------------------------------------------------------------------===//
#include "SparcV8.h"
#include "SparcV8InstrInfo.h"
#include "llvm/Instructions.h"
#include "llvm/IntrinsicLowering.h"
#include "llvm/Pass.h"
#include "llvm/Constants.h"
#include "llvm/CodeGen/MachineInstrBuilder.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"
@ -54,6 +57,7 @@ namespace {
BB = MBBMap[&LLVM_BB];
}
void visitBinaryOperator(BinaryOperator &I);
void visitReturnInst(ReturnInst &RI);
void visitInstruction(Instruction &I) {
@ -65,10 +69,72 @@ namespace {
/// function, lowering any calls to unknown intrinsic functions into the
/// equivalent LLVM code.
void LowerUnknownIntrinsicFunctionCalls(Function &F);
void visitIntrinsicCall(Intrinsic::ID ID, CallInst &CI);
/// copyConstantToRegister - Output the instructions required to put the
/// specified constant into the specified register.
///
void copyConstantToRegister(MachineBasicBlock *MBB,
MachineBasicBlock::iterator IP,
Constant *C, unsigned R);
/// makeAnotherReg - This method returns the next register number we haven't
/// yet used.
///
/// Long values are handled somewhat specially. They are always allocated
/// as pairs of 32 bit integer values. The register number returned is the
/// lower 32 bits of the long value, and the regNum+1 is the upper 32 bits
/// of the long value.
///
unsigned makeAnotherReg(const Type *Ty) {
assert(dynamic_cast<const SparcV8RegisterInfo*>(TM.getRegisterInfo()) &&
"Current target doesn't have SparcV8 reg info??");
const SparcV8RegisterInfo *MRI =
static_cast<const SparcV8RegisterInfo*>(TM.getRegisterInfo());
if (Ty == Type::LongTy || Ty == Type::ULongTy) {
const TargetRegisterClass *RC = MRI->getRegClassForType(Type::IntTy);
// Create the lower part
F->getSSARegMap()->createVirtualRegister(RC);
// Create the upper part.
return F->getSSARegMap()->createVirtualRegister(RC)-1;
}
// Add the mapping of regnumber => reg class to MachineFunction
const TargetRegisterClass *RC = MRI->getRegClassForType(Ty);
return F->getSSARegMap()->createVirtualRegister(RC);
}
unsigned getReg(Value &V) { return getReg (&V); } // allow refs.
unsigned getReg(Value *V) {
// Just append to the end of the current bb.
MachineBasicBlock::iterator It = BB->end();
return getReg(V, BB, It);
}
unsigned getReg(Value *V, MachineBasicBlock *MBB,
MachineBasicBlock::iterator IPt) {
unsigned &Reg = RegMap[V];
if (Reg == 0) {
Reg = makeAnotherReg(V->getType());
RegMap[V] = Reg;
}
// If this operand is a constant, emit the code to copy the constant into
// the register here...
//
if (Constant *C = dyn_cast<Constant>(V)) {
copyConstantToRegister(MBB, IPt, C, Reg);
RegMap.erase(V); // Assign a new name to this constant if ref'd again
} else if (GlobalValue *GV = dyn_cast<GlobalValue>(V)) {
// Move the address of the global into the register
// X86 does:
// BuildMI(*MBB, IPt, V8::ORrr, 2, Reg).addReg(G0).addGlobalAddress(GV);
// We need to use SETHI and OR.
assert (0 && "Can't move address of global yet");
RegMap.erase(V); // Assign a new name to this address if ref'd again
}
return Reg;
}
};
}
@ -76,6 +142,40 @@ FunctionPass *llvm::createSparcV8SimpleInstructionSelector(TargetMachine &TM) {
return new V8ISel(TM);
}
enum TypeClass {
cByte, cShort, cInt, cFloat, cDouble
};
static TypeClass getClass (const Type *T) {
switch (T->getPrimitiveID ()) {
case Type::UByteTyID: case Type::SByteTyID: return cByte;
case Type::UShortTyID: case Type::ShortTyID: return cShort;
case Type::UIntTyID: case Type::IntTyID: return cInt;
case Type::FloatTyID: return cFloat;
case Type::DoubleTyID: return cDouble;
default:
assert (0 && "Type of unknown class passed to getClass?");
return cByte;
}
}
/// 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 (C->getType()->isIntegral()) {
unsigned Class = getClass(C->getType());
ConstantInt *CI = cast<ConstantInt>(C);
// cByte: or %g0, <imm>, <dest>
// cShort or cInt: sethi, then or
// BuildMI(*MBB, IP, <opcode>, <#regs>, R).addImm(CI->getRawValue());
}
assert (0 && "Can't copy constants into registers yet");
}
bool V8ISel::runOnFunction(Function &Fn) {
// First pass over the function, lower any unknown intrinsic functions
@ -113,13 +213,58 @@ bool V8ISel::runOnFunction(Function &Fn) {
void V8ISel::visitReturnInst(ReturnInst &I) {
if (I.getNumOperands() == 0) {
// Just emit a 'ret' instruction
// Just emit a 'jmpl' instruction to return.
BuildMI(BB, V8::JMPLi, 2, V8::G0).addZImm(8).addReg(V8::I7);
return;
}
visitInstruction(I);
}
void V8ISel::visitBinaryOperator (BinaryOperator &I) {
unsigned DestReg = getReg (I);
unsigned Op0Reg = getReg (I.getOperand (0));
unsigned Op1Reg = getReg (I.getOperand (1));
unsigned ResultReg = makeAnotherReg (I.getType ());
switch (I.getOpcode ()) {
case Instruction::Add:
BuildMI (BB, V8::ADDrr, 2, ResultReg).addReg (Op0Reg).addReg (Op1Reg);
break;
default:
visitInstruction (I);
return;
}
switch (getClass (I.getType ())) {
case cByte:
if (I.getType ()->isSigned ()) { // add byte
BuildMI (BB, V8::ANDri, 2, DestReg).addReg (ResultReg).addZImm (0xff);
} else { // add ubyte
unsigned TmpReg = makeAnotherReg (I.getType ());
BuildMI (BB, V8::SLLri, 2, TmpReg).addReg (ResultReg).addZImm (24);
BuildMI (BB, V8::SRAri, 2, DestReg).addReg (TmpReg).addZImm (24);
}
break;
case cShort:
if (I.getType ()->isSigned ()) { // add short
unsigned TmpReg = makeAnotherReg (I.getType ());
BuildMI (BB, V8::SLLri, 2, TmpReg).addReg (ResultReg).addZImm (16);
BuildMI (BB, V8::SRAri, 2, DestReg).addReg (TmpReg).addZImm (16);
} else { // add ushort
unsigned TmpReg = makeAnotherReg (I.getType ());
BuildMI (BB, V8::SLLri, 2, TmpReg).addReg (ResultReg).addZImm (24);
BuildMI (BB, V8::SRLri, 2, DestReg).addReg (TmpReg).addZImm (24);
}
break;
case cInt:
BuildMI (BB, V8::ORrr, 2, DestReg).addReg (V8::G0).addReg (ResultReg);
break;
default:
visitInstruction (I);
return;
}
}
/// LowerUnknownIntrinsicFunctionCalls - This performs a prepass over the
/// function, lowering any calls to unknown intrinsic functions into the

14
llvm/lib/Target/SparcV8/SparcV8InstrInfo.td
View File

@ -62,7 +62,19 @@ def CALL : InstV8 {
let Name = "call";
}
// Section B.25: Jump and Link - p126
// Section B.11 - Logical Instructions, p. 106
def ANDri : F3_2<2, 0b000001, "and">;
def ORrr : F3_1<2, 0b000010, "or">;
// Section B.12 - Shift Instructions, p. 107
def SLLri : F3_1<2, 0b100101, "sll">;
def SRLri : F3_1<2, 0b100110, "srl">;
def SRAri : F3_1<2, 0b100111, "sra">;
// Section B.13 - Add Instructions, p. 108
def ADDrr : F3_1<2, 0b000000, "add">;
// Section B.25 - Jump and Link, p. 126
def JMPLr : F3_1<2, 0b111000, "jmpl">; // jmpl [rs1+rs2], rd
def JMPLi : F3_2<2, 0b111000, "jmpl">; // jmpl [rs1+imm], rd