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llvm-6502/lib/Target/SparcV8/SparcV8ISelDAGToDAG.cpp
Chris Lattner 2db3ff66f1 Implement Calls for V8. This would be completely autogenerated except for 
a small bug in tblgen.  When that is fixed, we can remove the ISD::Call case
in Select.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@24830 91177308-0d34-0410-b5e6-96231b3b80d8
2005-12-18 15:55:15 +00:00

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//===-- SparcV8ISelDAGToDAG.cpp - A dag to dag inst selector for SparcV8 --===//
//
// The LLVM Compiler Infrastructure
//
// This file was developed by Chris Lattner and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file defines an instruction selector for the V8 target
//
//===----------------------------------------------------------------------===//
#include "SparcV8.h"
#include "SparcV8TargetMachine.h"
#include "llvm/DerivedTypes.h"
#include "llvm/Function.h"
#include "llvm/CodeGen/MachineFrameInfo.h"
#include "llvm/CodeGen/MachineFunction.h"
#include "llvm/CodeGen/MachineInstrBuilder.h"
#include "llvm/CodeGen/SelectionDAG.h"
#include "llvm/CodeGen/SelectionDAGISel.h"
#include "llvm/CodeGen/SSARegMap.h"
#include "llvm/Target/TargetLowering.h"
#include "llvm/Support/Debug.h"
#include <iostream>
using namespace llvm;
//===----------------------------------------------------------------------===//
// TargetLowering Implementation
//===----------------------------------------------------------------------===//
namespace V8ISD {
enum {
FIRST_NUMBER = ISD::BUILTIN_OP_END+V8::INSTRUCTION_LIST_END,
CMPICC, // Compare two GPR operands, set icc.
CMPFCC, // Compare two FP operands, set fcc.
BRICC, // Branch to dest on icc condition
BRFCC, // Branch to dest on fcc condition
Hi, Lo, // Hi/Lo operations, typically on a global address.
FTOI, // FP to Int within a FP register.
ITOF, // Int to FP within a FP register.
SELECT_ICC, // Select between two values using the current ICC flags.
SELECT_FCC, // Select between two values using the current FCC flags.
};
}
namespace {
class SparcV8TargetLowering : public TargetLowering {
int VarArgsFrameOffset; // Frame offset to start of varargs area.
public:
SparcV8TargetLowering(TargetMachine &TM);
virtual SDOperand LowerOperation(SDOperand Op, SelectionDAG &DAG);
virtual std::vector<SDOperand>
LowerArguments(Function &F, SelectionDAG &DAG);
virtual std::pair<SDOperand, SDOperand>
LowerCallTo(SDOperand Chain, const Type *RetTy, bool isVarArg,
unsigned CC,
bool isTailCall, SDOperand Callee, ArgListTy &Args,
SelectionDAG &DAG);
virtual SDOperand LowerReturnTo(SDOperand Chain, SDOperand Op,
SelectionDAG &DAG);
virtual SDOperand LowerVAStart(SDOperand Chain, SDOperand VAListP,
Value *VAListV, SelectionDAG &DAG);
virtual std::pair<SDOperand,SDOperand>
LowerVAArg(SDOperand Chain, SDOperand VAListP, Value *VAListV,
const Type *ArgTy, SelectionDAG &DAG);
virtual std::pair<SDOperand, SDOperand>
LowerFrameReturnAddress(bool isFrameAddr, SDOperand Chain, unsigned Depth,
SelectionDAG &DAG);
virtual MachineBasicBlock *InsertAtEndOfBasicBlock(MachineInstr *MI,
MachineBasicBlock *MBB);
};
}
SparcV8TargetLowering::SparcV8TargetLowering(TargetMachine &TM)
: TargetLowering(TM) {
// Set up the register classes.
addRegisterClass(MVT::i32, V8::IntRegsRegisterClass);
addRegisterClass(MVT::f32, V8::FPRegsRegisterClass);
addRegisterClass(MVT::f64, V8::DFPRegsRegisterClass);
// Custom legalize GlobalAddress nodes into LO/HI parts.
setOperationAction(ISD::GlobalAddress, MVT::i32, Custom);
setOperationAction(ISD::ConstantPool , MVT::i32, Custom);
// Sparc doesn't have sext_inreg, replace them with shl/sra
setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i16, Expand);
setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i8 , Expand);
setOperationAction(ISD::SIGN_EXTEND_INREG, MVT::i1 , Expand);
// Sparc has no REM operation.
setOperationAction(ISD::UREM, MVT::i32, Expand);
setOperationAction(ISD::SREM, MVT::i32, Expand);
// Custom expand fp<->sint
setOperationAction(ISD::FP_TO_SINT, MVT::i32, Custom);
setOperationAction(ISD::SINT_TO_FP, MVT::i32, Custom);
// Expand fp<->uint
setOperationAction(ISD::FP_TO_UINT, MVT::i32, Expand);
setOperationAction(ISD::UINT_TO_FP, MVT::i32, Expand);
setOperationAction(ISD::EXTLOAD, MVT::f32, Expand);
// Sparc has no select or setcc: expand to SELECT_CC.
setOperationAction(ISD::SELECT, MVT::i32, Expand);
setOperationAction(ISD::SELECT, MVT::f32, Expand);
setOperationAction(ISD::SELECT, MVT::f64, Expand);
setOperationAction(ISD::SETCC, MVT::i32, Expand);
setOperationAction(ISD::SETCC, MVT::f32, Expand);
setOperationAction(ISD::SETCC, MVT::f64, Expand);
// Sparc doesn't have BRCOND either, it has BR_CC.
setOperationAction(ISD::BRCOND, MVT::Other, Expand);
setOperationAction(ISD::BRCONDTWOWAY, MVT::Other, Expand);
setOperationAction(ISD::BRTWOWAY_CC, MVT::Other, Expand);
setOperationAction(ISD::BR_CC, MVT::i32, Custom);
setOperationAction(ISD::BR_CC, MVT::f32, Custom);
setOperationAction(ISD::BR_CC, MVT::f64, Custom);
setOperationAction(ISD::SELECT_CC, MVT::i32, Custom);
setOperationAction(ISD::SELECT_CC, MVT::f32, Custom);
setOperationAction(ISD::SELECT_CC, MVT::f64, Custom);
computeRegisterProperties();
}
/// LowerArguments - V8 uses a very simple ABI, where all values are passed in
/// either one or two GPRs, including FP values. TODO: we should pass FP values
/// in FP registers for fastcc functions.
std::vector<SDOperand>
SparcV8TargetLowering::LowerArguments(Function &F, SelectionDAG &DAG) {
MachineFunction &MF = DAG.getMachineFunction();
SSARegMap *RegMap = MF.getSSARegMap();
std::vector<SDOperand> ArgValues;
static const unsigned ArgRegs[] = {
V8::I0, V8::I1, V8::I2, V8::I3, V8::I4, V8::I5
};
const unsigned *CurArgReg = ArgRegs, *ArgRegEnd = ArgRegs+6;
unsigned ArgOffset = 68;
SDOperand Root = DAG.getRoot();
std::vector<SDOperand> OutChains;
for (Function::arg_iterator I = F.arg_begin(), E = F.arg_end(); I != E; ++I) {
MVT::ValueType ObjectVT = getValueType(I->getType());
switch (ObjectVT) {
default: assert(0 && "Unhandled argument type!");
case MVT::i1:
case MVT::i8:
case MVT::i16:
case MVT::i32:
if (I->use_empty()) { // Argument is dead.
if (CurArgReg < ArgRegEnd) ++CurArgReg;
ArgValues.push_back(DAG.getNode(ISD::UNDEF, ObjectVT));
} else if (CurArgReg < ArgRegEnd) { // Lives in an incoming GPR
unsigned VReg = RegMap->createVirtualRegister(&V8::IntRegsRegClass);
MF.addLiveIn(*CurArgReg++, VReg);
SDOperand Arg = DAG.getCopyFromReg(Root, VReg, MVT::i32);
if (ObjectVT != MVT::i32) {
unsigned AssertOp = I->getType()->isSigned() ? ISD::AssertSext
: ISD::AssertZext;
Arg = DAG.getNode(AssertOp, MVT::i32, Arg,
DAG.getValueType(ObjectVT));
Arg = DAG.getNode(ISD::TRUNCATE, ObjectVT, Arg);
}
ArgValues.push_back(Arg);
} else {
int FrameIdx = MF.getFrameInfo()->CreateFixedObject(4, ArgOffset);
SDOperand FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32);
SDOperand Load;
if (ObjectVT == MVT::i32) {
Load = DAG.getLoad(MVT::i32, Root, FIPtr, DAG.getSrcValue(0));
} else {
unsigned LoadOp =
I->getType()->isSigned() ? ISD::SEXTLOAD : ISD::ZEXTLOAD;
Load = DAG.getExtLoad(LoadOp, MVT::i32, Root, FIPtr,
DAG.getSrcValue(0), ObjectVT);
}
ArgValues.push_back(Load);
}
ArgOffset += 4;
break;
case MVT::f32:
if (I->use_empty()) { // Argument is dead.
if (CurArgReg < ArgRegEnd) ++CurArgReg;
ArgValues.push_back(DAG.getNode(ISD::UNDEF, ObjectVT));
} else if (CurArgReg < ArgRegEnd) { // Lives in an incoming GPR
// FP value is passed in an integer register.
unsigned VReg = RegMap->createVirtualRegister(&V8::IntRegsRegClass);
MF.addLiveIn(*CurArgReg++, VReg);
SDOperand Arg = DAG.getCopyFromReg(Root, VReg, MVT::i32);
// We use the stack space that is already reserved for this reg.
int FrameIdx = MF.getFrameInfo()->CreateFixedObject(4, ArgOffset);
SDOperand FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32);
SDOperand SV = DAG.getSrcValue(0);
SDOperand Store = DAG.getNode(ISD::STORE, MVT::Other, Root,
Arg, FIPtr, SV);
ArgValues.push_back(DAG.getLoad(MVT::f32, Store, FIPtr, SV));
}
ArgOffset += 4;
break;
case MVT::i64:
case MVT::f64:
if (I->use_empty()) { // Argument is dead.
if (CurArgReg < ArgRegEnd) ++CurArgReg;
if (CurArgReg < ArgRegEnd) ++CurArgReg;
ArgValues.push_back(DAG.getNode(ISD::UNDEF, ObjectVT));
} else if (CurArgReg == ArgRegEnd && ObjectVT == MVT::f64 &&
((CurArgReg-ArgRegs) & 1) == 0) {
// If this is a double argument and the whole thing lives on the stack,
// and the argument is aligned, load the double straight from the stack.
// We can't do a load in cases like void foo([6ints], int,double),
// because the double wouldn't be aligned!
int FrameIdx = MF.getFrameInfo()->CreateFixedObject(8, ArgOffset);
SDOperand FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32);
ArgValues.push_back(DAG.getLoad(MVT::f64, Root, FIPtr,
DAG.getSrcValue(0)));
} else {
SDOperand HiVal;
if (CurArgReg < ArgRegEnd) { // Lives in an incoming GPR
unsigned VRegHi = RegMap->createVirtualRegister(&V8::IntRegsRegClass);
MF.addLiveIn(*CurArgReg++, VRegHi);
HiVal = DAG.getCopyFromReg(Root, VRegHi, MVT::i32);
} else {
int FrameIdx = MF.getFrameInfo()->CreateFixedObject(4, ArgOffset);
SDOperand FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32);
HiVal = DAG.getLoad(MVT::i32, Root, FIPtr, DAG.getSrcValue(0));
}
SDOperand LoVal;
if (CurArgReg < ArgRegEnd) { // Lives in an incoming GPR
unsigned VRegLo = RegMap->createVirtualRegister(&V8::IntRegsRegClass);
MF.addLiveIn(*CurArgReg++, VRegLo);
LoVal = DAG.getCopyFromReg(Root, VRegLo, MVT::i32);
} else {
int FrameIdx = MF.getFrameInfo()->CreateFixedObject(4, ArgOffset+4);
SDOperand FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32);
LoVal = DAG.getLoad(MVT::i32, Root, FIPtr, DAG.getSrcValue(0));
}
// Compose the two halves together into an i64 unit.
SDOperand WholeValue =
DAG.getNode(ISD::BUILD_PAIR, MVT::i64, LoVal, HiVal);
if (ObjectVT == MVT::i64) {
// If we are emitting an i64, this is what we want.
ArgValues.push_back(WholeValue);
} else {
assert(ObjectVT == MVT::f64);
// Otherwise, emit a store to the stack and reload into FPR.
int FrameIdx = MF.getFrameInfo()->CreateStackObject(8, 8);
SDOperand FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32);
SDOperand SV = DAG.getSrcValue(0);
SDOperand Store = DAG.getNode(ISD::STORE, MVT::Other, Root,
WholeValue, FIPtr, SV);
ArgValues.push_back(DAG.getLoad(MVT::f64, Store, FIPtr, SV));
}
}
ArgOffset += 8;
break;
}
}
// Store remaining ArgRegs to the stack if this is a varargs function.
if (F.getFunctionType()->isVarArg()) {
// Remember the vararg offset for the va_start implementation.
VarArgsFrameOffset = ArgOffset;
for (; CurArgReg != ArgRegEnd; ++CurArgReg) {
unsigned VReg = RegMap->createVirtualRegister(&V8::IntRegsRegClass);
MF.addLiveIn(*CurArgReg, VReg);
SDOperand Arg = DAG.getCopyFromReg(DAG.getRoot(), VReg, MVT::i32);
int FrameIdx = MF.getFrameInfo()->CreateFixedObject(4, ArgOffset);
SDOperand FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32);
OutChains.push_back(DAG.getNode(ISD::STORE, MVT::Other, DAG.getRoot(),
Arg, FIPtr, DAG.getSrcValue(0)));
ArgOffset += 4;
}
}
if (!OutChains.empty())
DAG.setRoot(DAG.getNode(ISD::TokenFactor, MVT::Other, OutChains));
// Finally, inform the code generator which regs we return values in.
switch (getValueType(F.getReturnType())) {
default: assert(0 && "Unknown type!");
case MVT::isVoid: break;
case MVT::i1:
case MVT::i8:
case MVT::i16:
case MVT::i32:
MF.addLiveOut(V8::I0);
break;
case MVT::i64:
MF.addLiveOut(V8::I0);
MF.addLiveOut(V8::I1);
break;
case MVT::f32:
MF.addLiveOut(V8::F0);
break;
case MVT::f64:
MF.addLiveOut(V8::D0);
break;
}
return ArgValues;
}
std::pair<SDOperand, SDOperand>
SparcV8TargetLowering::LowerCallTo(SDOperand Chain, const Type *RetTy,
bool isVarArg, unsigned CC,
bool isTailCall, SDOperand Callee,
ArgListTy &Args, SelectionDAG &DAG) {
MachineFunction &MF = DAG.getMachineFunction();
// Count the size of the outgoing arguments.
unsigned ArgsSize = 0;
for (unsigned i = 0, e = Args.size(); i != e; ++i) {
switch (getValueType(Args[i].second)) {
default: assert(0 && "Unknown value type!");
case MVT::i1:
case MVT::i8:
case MVT::i16:
case MVT::i32:
case MVT::f32:
ArgsSize += 4;
break;
case MVT::i64:
case MVT::f64:
ArgsSize += 8;
break;
}
}
if (ArgsSize > 4*6)
ArgsSize -= 4*6; // Space for first 6 arguments is prereserved.
else
ArgsSize = 0;
Chain = DAG.getNode(ISD::CALLSEQ_START, MVT::Other, Chain,
DAG.getConstant(ArgsSize, getPointerTy()));
SDOperand StackPtr, NullSV;
std::vector<SDOperand> Stores;
std::vector<SDOperand> RegValuesToPass;
unsigned ArgOffset = 68;
for (unsigned i = 0, e = Args.size(); i != e; ++i) {
SDOperand Val = Args[i].first;
MVT::ValueType ObjectVT = Val.getValueType();
SDOperand ValToStore;
unsigned ObjSize;
switch (ObjectVT) {
default: assert(0 && "Unhandled argument type!");
case MVT::i1:
case MVT::i8:
case MVT::i16:
// Promote the integer to 32-bits. If the input type is signed, use a
// sign extend, otherwise use a zero extend.
if (Args[i].second->isSigned())
Val = DAG.getNode(ISD::SIGN_EXTEND, MVT::i32, Val);
else
Val = DAG.getNode(ISD::ZERO_EXTEND, MVT::i32, Val);
// FALL THROUGH
case MVT::i32:
ObjSize = 4;
if (RegValuesToPass.size() >= 6) {
ValToStore = Val;
} else {
RegValuesToPass.push_back(Val);
}
break;
case MVT::f32:
ObjSize = 4;
if (RegValuesToPass.size() >= 6) {
ValToStore = Val;
} else {
// Convert this to a FP value in an int reg.
int FrameIdx = MF.getFrameInfo()->CreateStackObject(4, 4);
SDOperand FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32);
SDOperand SV = DAG.getSrcValue(0);
SDOperand Store = DAG.getNode(ISD::STORE, MVT::Other, Chain,
Val, FIPtr, SV);
Val = DAG.getLoad(MVT::i32, Store, FIPtr, SV);
RegValuesToPass.push_back(Val);
}
break;
case MVT::f64: {
ObjSize = 8;
// If we can store this directly into the outgoing slot, do so. We can
// do this when all ArgRegs are used and if the outgoing slot is aligned.
if (RegValuesToPass.size() >= 6 && ((ArgOffset-68) & 7) == 0) {
ValToStore = Val;
break;
}
// Otherwise, convert this to a FP value in int regs.
int FrameIdx = MF.getFrameInfo()->CreateStackObject(8, 8);
SDOperand FIPtr = DAG.getFrameIndex(FrameIdx, MVT::i32);
SDOperand SV = DAG.getSrcValue(0);
SDOperand Store = DAG.getNode(ISD::STORE, MVT::Other, Chain,
Val, FIPtr, SV);
Val = DAG.getLoad(MVT::i64, Store, FIPtr, SV);
}
// FALL THROUGH
case MVT::i64:
ObjSize = 8;
if (RegValuesToPass.size() >= 6) {
ValToStore = Val; // Whole thing is passed in memory.
break;
}
// Split the value into top and bottom part. Top part goes in a reg.
SDOperand Hi = DAG.getNode(ISD::EXTRACT_ELEMENT, MVT::i32, Val,
DAG.getConstant(1, MVT::i32));
SDOperand Lo = DAG.getNode(ISD::EXTRACT_ELEMENT, MVT::i32, Val,
DAG.getConstant(0, MVT::i32));
RegValuesToPass.push_back(Hi);
if (RegValuesToPass.size() >= 6) {
ValToStore = Lo;
} else {
RegValuesToPass.push_back(Lo);
}
break;
}
if (ValToStore.Val) {
if (!StackPtr.Val) {
StackPtr = DAG.getCopyFromReg(DAG.getEntryNode(), V8::SP, MVT::i32);
NullSV = DAG.getSrcValue(NULL);
}
SDOperand PtrOff = DAG.getConstant(ArgOffset, getPointerTy());
PtrOff = DAG.getNode(ISD::ADD, MVT::i32, StackPtr, PtrOff);
Stores.push_back(DAG.getNode(ISD::STORE, MVT::Other, Chain,
ValToStore, PtrOff, NullSV));
}
ArgOffset += ObjSize;
}
// Emit all stores, make sure the occur before any copies into physregs.
if (!Stores.empty())
Chain = DAG.getNode(ISD::TokenFactor, MVT::Other, Stores);
static const unsigned ArgRegs[] = {
V8::O0, V8::O1, V8::O2, V8::O3, V8::O4, V8::O5
};
// Build a sequence of copy-to-reg nodes chained together with token chain
// and flag operands which copy the outgoing args into O[0-5].
SDOperand InFlag;
for (unsigned i = 0, e = RegValuesToPass.size(); i != e; ++i) {
Chain = DAG.getCopyToReg(Chain, ArgRegs[i], RegValuesToPass[i], InFlag);
InFlag = Chain.getValue(1);
}
std::vector<MVT::ValueType> RetVals;
RetVals.push_back(MVT::Other);
RetVals.push_back(MVT::Flag);
// If the callee is a GlobalAddress node (quite common, every direct call is)
// turn it into a TargetGlobalAddress node so that legalize doesn't hack it.
if (GlobalAddressSDNode *G = dyn_cast<GlobalAddressSDNode>(Callee))
Callee = DAG.getTargetGlobalAddress(G->getGlobal(), MVT::i32);
std::vector<MVT::ValueType> NodeTys;
NodeTys.push_back(MVT::Other); // Returns a chain
NodeTys.push_back(MVT::Flag); // Returns a flag for retval copy to use.
Chain = SDOperand(DAG.getCall(NodeTys, Chain, Callee, InFlag), 0);
InFlag = Chain.getValue(1);
MVT::ValueType RetTyVT = getValueType(RetTy);
SDOperand RetVal;
if (RetTyVT != MVT::isVoid) {
switch (RetTyVT) {
default: assert(0 && "Unknown value type to return!");
case MVT::i1:
case MVT::i8:
case MVT::i16:
RetVal = DAG.getCopyFromReg(Chain, V8::O0, MVT::i32, InFlag);
Chain = RetVal.getValue(1);
// Add a note to keep track of whether it is sign or zero extended.
RetVal = DAG.getNode(RetTy->isSigned() ? ISD::AssertSext :ISD::AssertZext,
MVT::i32, RetVal, DAG.getValueType(RetTyVT));
RetVal = DAG.getNode(ISD::TRUNCATE, RetTyVT, RetVal);
break;
case MVT::i32:
RetVal = DAG.getCopyFromReg(Chain, V8::O0, MVT::i32, InFlag);
Chain = RetVal.getValue(1);
break;
case MVT::f32:
RetVal = DAG.getCopyFromReg(Chain, V8::F0, MVT::f32, InFlag);
Chain = RetVal.getValue(1);
break;
case MVT::f64:
RetVal = DAG.getCopyFromReg(Chain, V8::D0, MVT::f64, InFlag);
Chain = RetVal.getValue(1);
break;
case MVT::i64:
SDOperand Lo = DAG.getCopyFromReg(Chain, V8::O0, MVT::i32, InFlag);
SDOperand Hi = DAG.getCopyFromReg(Lo.getValue(1), V8::O0, MVT::i32,
Lo.getValue(2));
RetVal = DAG.getNode(ISD::BUILD_PAIR, MVT::i64, Lo, Hi);
Chain = Hi.getValue(1);
break;
}
}
Chain = DAG.getNode(ISD::CALLSEQ_END, MVT::Other, Chain,
DAG.getConstant(ArgsSize, getPointerTy()));
MVT::ValueType ActualRetTyVT = RetTyVT;
if (RetTyVT >= MVT::i1 && RetTyVT <= MVT::i16)
ActualRetTyVT = MVT::i32; // Promote result to i32.
return std::make_pair(RetVal, Chain);
}
SDOperand SparcV8TargetLowering::LowerReturnTo(SDOperand Chain, SDOperand Op,
SelectionDAG &DAG) {
if (Op.getValueType() == MVT::i64) {
SDOperand Hi = DAG.getNode(ISD::EXTRACT_ELEMENT, MVT::i32, Op,
DAG.getConstant(1, MVT::i32));
SDOperand Lo = DAG.getNode(ISD::EXTRACT_ELEMENT, MVT::i32, Op,
DAG.getConstant(0, MVT::i32));
return DAG.getNode(ISD::RET, MVT::Other, Chain, Lo, Hi);
} else {
return DAG.getNode(ISD::RET, MVT::Other, Chain, Op);
}
}
SDOperand SparcV8TargetLowering::
LowerVAStart(SDOperand Chain, SDOperand VAListP, Value *VAListV,
SelectionDAG &DAG) {
assert(0 && "Unimp");
abort();
}
std::pair<SDOperand,SDOperand> SparcV8TargetLowering::
LowerVAArg(SDOperand Chain, SDOperand VAListP, Value *VAListV,
const Type *ArgTy, SelectionDAG &DAG) {
assert(0 && "Unimp");
abort();
}
std::pair<SDOperand, SDOperand> SparcV8TargetLowering::
LowerFrameReturnAddress(bool isFrameAddr, SDOperand Chain, unsigned Depth,
SelectionDAG &DAG) {
assert(0 && "Unimp");
abort();
}
SDOperand SparcV8TargetLowering::
LowerOperation(SDOperand Op, SelectionDAG &DAG) {
switch (Op.getOpcode()) {
default: assert(0 && "Should not custom lower this!");
case ISD::GlobalAddress: {
GlobalValue *GV = cast<GlobalAddressSDNode>(Op)->getGlobal();
SDOperand GA = DAG.getTargetGlobalAddress(GV, MVT::i32);
SDOperand Hi = DAG.getNode(V8ISD::Hi, MVT::i32, GA);
SDOperand Lo = DAG.getNode(V8ISD::Lo, MVT::i32, GA);
return DAG.getNode(ISD::ADD, MVT::i32, Lo, Hi);
}
case ISD::ConstantPool: {
Constant *C = cast<ConstantPoolSDNode>(Op)->get();
SDOperand CP = DAG.getTargetConstantPool(C, MVT::i32);
SDOperand Hi = DAG.getNode(V8ISD::Hi, MVT::i32, CP);
SDOperand Lo = DAG.getNode(V8ISD::Lo, MVT::i32, CP);
return DAG.getNode(ISD::ADD, MVT::i32, Lo, Hi);
}
case ISD::FP_TO_SINT: {
// Convert the fp value to integer in an FP register.
Op = DAG.getNode(V8ISD::FTOI, Op.getOperand(0).getValueType(),
Op.getOperand(0));
int Size = Op.getOperand(0).getValueType() == MVT::f32 ? 4 : 8;
int FrameIdx =
DAG.getMachineFunction().getFrameInfo()->CreateStackObject(Size, Size);
SDOperand FI = DAG.getFrameIndex(FrameIdx, MVT::i32);
SDOperand ST = DAG.getNode(ISD::STORE, MVT::Other, DAG.getEntryNode(),
Op, FI, DAG.getSrcValue(0));
return DAG.getLoad(MVT::i32, ST, FI, DAG.getSrcValue(0));
}
case ISD::SINT_TO_FP: {
int Size = Op.getOperand(0).getValueType() == MVT::f32 ? 4 : 8;
int FrameIdx =
DAG.getMachineFunction().getFrameInfo()->CreateStackObject(Size, Size);
SDOperand FI = DAG.getFrameIndex(FrameIdx, MVT::i32);
SDOperand ST = DAG.getNode(ISD::STORE, MVT::Other, DAG.getEntryNode(),
Op.getOperand(0), FI, DAG.getSrcValue(0));
Op = DAG.getLoad(Op.getValueType(), ST, FI, DAG.getSrcValue(0));
// Convert the int value to FP in an FP register.
return DAG.getNode(V8ISD::ITOF, Op.getValueType(), Op);
}
case ISD::BR_CC: {
SDOperand Chain = Op.getOperand(0);
SDOperand CC = Op.getOperand(1);
SDOperand LHS = Op.getOperand(2);
SDOperand RHS = Op.getOperand(3);
SDOperand Dest = Op.getOperand(4);
// Get the condition flag.
if (LHS.getValueType() == MVT::i32) {
SDOperand Cond = DAG.getNode(V8ISD::CMPICC, MVT::Flag, LHS, RHS);
return DAG.getNode(V8ISD::BRICC, MVT::Other, Chain, Dest, CC, Cond);
} else {
SDOperand Cond = DAG.getNode(V8ISD::CMPFCC, MVT::Flag, LHS, RHS);
return DAG.getNode(V8ISD::BRFCC, MVT::Other, Chain, Dest, CC, Cond);
}
}
case ISD::SELECT_CC: {
SDOperand LHS = Op.getOperand(0);
SDOperand RHS = Op.getOperand(1);
unsigned CC = cast<CondCodeSDNode>(Op.getOperand(4))->get();
SDOperand TrueVal = Op.getOperand(2);
SDOperand FalseVal = Op.getOperand(3);
unsigned Opc;
Opc = LHS.getValueType() == MVT::i32 ? V8ISD::CMPICC : V8ISD::CMPFCC;
SDOperand CompareFlag = DAG.getNode(Opc, MVT::Flag, LHS, RHS);
Opc = LHS.getValueType() == MVT::i32 ?
V8ISD::SELECT_ICC : V8ISD::SELECT_FCC;
return DAG.getNode(Opc, TrueVal.getValueType(), TrueVal, FalseVal,
DAG.getConstant(CC, MVT::i32), CompareFlag);
}
}
}
MachineBasicBlock *
SparcV8TargetLowering::InsertAtEndOfBasicBlock(MachineInstr *MI,
MachineBasicBlock *BB) {
unsigned BROpcode;
// Figure out the conditional branch opcode to use for this select_cc.
switch (MI->getOpcode()) {
default: assert(0 && "Unknown SELECT_CC!");
case V8::SELECT_CC_Int_ICC:
case V8::SELECT_CC_FP_ICC:
case V8::SELECT_CC_DFP_ICC:
// Integer compare.
switch ((ISD::CondCode)MI->getOperand(3).getImmedValue()) {
default: assert(0 && "Unknown integer condition code!");
case ISD::SETEQ: BROpcode = V8::BE; break;
case ISD::SETNE: BROpcode = V8::BNE; break;
case ISD::SETLT: BROpcode = V8::BL; break;
case ISD::SETGT: BROpcode = V8::BG; break;
case ISD::SETLE: BROpcode = V8::BLE; break;
case ISD::SETGE: BROpcode = V8::BGE; break;
case ISD::SETULT: BROpcode = V8::BCS; break;
case ISD::SETULE: BROpcode = V8::BLEU; break;
case ISD::SETUGT: BROpcode = V8::BGU; break;
case ISD::SETUGE: BROpcode = V8::BCC; break;
}
break;
case V8::SELECT_CC_Int_FCC:
case V8::SELECT_CC_FP_FCC:
case V8::SELECT_CC_DFP_FCC:
// FP compare.
switch ((ISD::CondCode)MI->getOperand(3).getImmedValue()) {
default: assert(0 && "Unknown fp condition code!");
case ISD::SETEQ: BROpcode = V8::FBE; break;
case ISD::SETNE: BROpcode = V8::FBNE; break;
case ISD::SETLT: BROpcode = V8::FBL; break;
case ISD::SETGT: BROpcode = V8::FBG; break;
case ISD::SETLE: BROpcode = V8::FBLE; break;
case ISD::SETGE: BROpcode = V8::FBGE; break;
case ISD::SETULT: BROpcode = V8::FBUL; break;
case ISD::SETULE: BROpcode = V8::FBULE; break;
case ISD::SETUGT: BROpcode = V8::FBUG; break;
case ISD::SETUGE: BROpcode = V8::FBUGE; break;
case ISD::SETUO: BROpcode = V8::FBU; break;
case ISD::SETO: BROpcode = V8::FBO; break;
case ISD::SETONE: BROpcode = V8::FBLG; break;
case ISD::SETUEQ: BROpcode = V8::FBUE; break;
}
break;
}
// To "insert" a SELECT_CC instruction, we actually have to insert the diamond
// control-flow pattern. The incoming instruction knows the destination vreg
// to set, the condition code register to branch on, the true/false values to
// select between, and a branch opcode to use.
const BasicBlock *LLVM_BB = BB->getBasicBlock();
ilist<MachineBasicBlock>::iterator It = BB;
++It;
// thisMBB:
// ...
// TrueVal = ...
// [f]bCC copy1MBB
// fallthrough --> copy0MBB
MachineBasicBlock *thisMBB = BB;
MachineBasicBlock *copy0MBB = new MachineBasicBlock(LLVM_BB);
MachineBasicBlock *sinkMBB = new MachineBasicBlock(LLVM_BB);
BuildMI(BB, BROpcode, 1).addMBB(sinkMBB);
MachineFunction *F = BB->getParent();
F->getBasicBlockList().insert(It, copy0MBB);
F->getBasicBlockList().insert(It, sinkMBB);
// Update machine-CFG edges
BB->addSuccessor(copy0MBB);
BB->addSuccessor(sinkMBB);
// copy0MBB:
// %FalseValue = ...
// # fallthrough to sinkMBB
BB = copy0MBB;
// Update machine-CFG edges
BB->addSuccessor(sinkMBB);
// sinkMBB:
// %Result = phi [ %FalseValue, copy0MBB ], [ %TrueValue, thisMBB ]
// ...
BB = sinkMBB;
BuildMI(BB, V8::PHI, 4, MI->getOperand(0).getReg())
.addReg(MI->getOperand(2).getReg()).addMBB(copy0MBB)
.addReg(MI->getOperand(1).getReg()).addMBB(thisMBB);
delete MI; // The pseudo instruction is gone now.
return BB;
}
//===----------------------------------------------------------------------===//
// Instruction Selector Implementation
//===----------------------------------------------------------------------===//
//===--------------------------------------------------------------------===//
/// SparcV8DAGToDAGISel - PPC specific code to select Sparc V8 machine
/// instructions for SelectionDAG operations.
///
namespace {
class SparcV8DAGToDAGISel : public SelectionDAGISel {
SparcV8TargetLowering V8Lowering;
public:
SparcV8DAGToDAGISel(TargetMachine &TM)
: SelectionDAGISel(V8Lowering), V8Lowering(TM) {}
SDOperand Select(SDOperand Op);
// Complex Pattern Selectors.
bool SelectADDRrr(SDOperand N, SDOperand &R1, SDOperand &R2);
bool SelectADDRri(SDOperand N, SDOperand &Base, SDOperand &Offset);
/// InstructionSelectBasicBlock - This callback is invoked by
/// SelectionDAGISel when it has created a SelectionDAG for us to codegen.
virtual void InstructionSelectBasicBlock(SelectionDAG &DAG);
virtual const char *getPassName() const {
return "PowerPC DAG->DAG Pattern Instruction Selection";
}
// Include the pieces autogenerated from the target description.
#include "SparcV8GenDAGISel.inc"
};
} // end anonymous namespace
/// InstructionSelectBasicBlock - This callback is invoked by
/// SelectionDAGISel when it has created a SelectionDAG for us to codegen.
void SparcV8DAGToDAGISel::InstructionSelectBasicBlock(SelectionDAG &DAG) {
DEBUG(BB->dump());
// Select target instructions for the DAG.
DAG.setRoot(Select(DAG.getRoot()));
CodeGenMap.clear();
DAG.RemoveDeadNodes();
// Emit machine code to BB.
ScheduleAndEmitDAG(DAG);
}
bool SparcV8DAGToDAGISel::SelectADDRri(SDOperand Addr, SDOperand &Base,
SDOperand &Offset) {
if (FrameIndexSDNode *FIN = dyn_cast<FrameIndexSDNode>(Addr)) {
Base = CurDAG->getTargetFrameIndex(FIN->getIndex(), MVT::i32);
Offset = CurDAG->getTargetConstant(0, MVT::i32);
return true;
}
if (Addr.getOpcode() == ISD::ADD) {
if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(Addr.getOperand(1))) {
if (Predicate_simm13(CN)) {
if (FrameIndexSDNode *FIN =
dyn_cast<FrameIndexSDNode>(Addr.getOperand(0))) {
// Constant offset from frame ref.
Base = CurDAG->getTargetFrameIndex(FIN->getIndex(), MVT::i32);
} else {
Base = Select(Addr.getOperand(0));
}
Offset = CurDAG->getTargetConstant(CN->getValue(), MVT::i32);
return true;
}
}
if (Addr.getOperand(0).getOpcode() == V8ISD::Lo) {
Base = Select(Addr.getOperand(1));
Offset = Addr.getOperand(0).getOperand(0);
return true;
}
if (Addr.getOperand(1).getOpcode() == V8ISD::Lo) {
Base = Select(Addr.getOperand(0));
Offset = Addr.getOperand(1).getOperand(0);
return true;
}
}
Base = Select(Addr);
Offset = CurDAG->getTargetConstant(0, MVT::i32);
return true;
}
bool SparcV8DAGToDAGISel::SelectADDRrr(SDOperand Addr, SDOperand &R1,
SDOperand &R2) {
if (Addr.getOpcode() == ISD::FrameIndex) return false;
if (Addr.getOpcode() == ISD::ADD) {
if (isa<ConstantSDNode>(Addr.getOperand(1)) &&
Predicate_simm13(Addr.getOperand(1).Val))
return false; // Let the reg+imm pattern catch this!
if (Addr.getOperand(0).getOpcode() == V8ISD::Lo ||
Addr.getOperand(1).getOpcode() == V8ISD::Lo)
return false; // Let the reg+imm pattern catch this!
R1 = Select(Addr.getOperand(0));
R2 = Select(Addr.getOperand(1));
return true;
}
R1 = Select(Addr);
R2 = CurDAG->getRegister(V8::G0, MVT::i32);
return true;
}
SDOperand SparcV8DAGToDAGISel::Select(SDOperand Op) {
SDNode *N = Op.Val;
if (N->getOpcode() >= ISD::BUILTIN_OP_END &&
N->getOpcode() < V8ISD::FIRST_NUMBER)
return Op; // Already selected.
// If this has already been converted, use it.
std::map<SDOperand, SDOperand>::iterator CGMI = CodeGenMap.find(Op);
if (CGMI != CodeGenMap.end()) return CGMI->second;
switch (N->getOpcode()) {
default: break;
case ISD::BasicBlock: return CodeGenMap[Op] = Op;
case ISD::FrameIndex: {
int FI = cast<FrameIndexSDNode>(N)->getIndex();
if (N->hasOneUse())
return CurDAG->SelectNodeTo(N, V8::ADDri, MVT::i32,
CurDAG->getTargetFrameIndex(FI, MVT::i32),
CurDAG->getTargetConstant(0, MVT::i32));
return CodeGenMap[Op] =
CurDAG->getTargetNode(V8::ADDri, MVT::i32,
CurDAG->getTargetFrameIndex(FI, MVT::i32),
CurDAG->getTargetConstant(0, MVT::i32));
}
case V8ISD::CMPICC: {
// FIXME: Handle compare with immediate.
SDOperand LHS = Select(N->getOperand(0));
SDOperand RHS = Select(N->getOperand(1));
SDOperand Result = CurDAG->getTargetNode(V8::SUBCCrr, MVT::i32, MVT::Flag,
LHS, RHS);
return CodeGenMap[Op] = Result.getValue(1);
}
case ISD::ADD_PARTS: {
SDOperand LHSL = Select(N->getOperand(0));
SDOperand LHSH = Select(N->getOperand(1));
SDOperand RHSL = Select(N->getOperand(2));
SDOperand RHSH = Select(N->getOperand(3));
// FIXME, handle immediate RHS.
SDOperand Low = CurDAG->getTargetNode(V8::ADDCCrr, MVT::i32, MVT::Flag,
LHSL, RHSL);
SDOperand Hi = CurDAG->getTargetNode(V8::ADDXrr, MVT::i32, LHSH, RHSH,
Low.getValue(1));
CodeGenMap[SDOperand(N, 0)] = Low;
CodeGenMap[SDOperand(N, 1)] = Hi;
return Op.ResNo ? Hi : Low;
}
case ISD::SUB_PARTS: {
SDOperand LHSL = Select(N->getOperand(0));
SDOperand LHSH = Select(N->getOperand(1));
SDOperand RHSL = Select(N->getOperand(2));
SDOperand RHSH = Select(N->getOperand(3));
// FIXME, handle immediate RHS.
SDOperand Low = CurDAG->getTargetNode(V8::SUBCCrr, MVT::i32, MVT::Flag,
LHSL, RHSL);
SDOperand Hi = CurDAG->getTargetNode(V8::SUBXrr, MVT::i32, LHSH, RHSH,
Low.getValue(1));
CodeGenMap[SDOperand(N, 0)] = Low;
CodeGenMap[SDOperand(N, 1)] = Hi;
return Op.ResNo ? Hi : Low;
}
case ISD::SDIV:
case ISD::UDIV: {
// FIXME: should use a custom expander to expose the SRA to the dag.
SDOperand DivLHS = Select(N->getOperand(0));
SDOperand DivRHS = Select(N->getOperand(1));
// Set the Y register to the high-part.
SDOperand TopPart;
if (N->getOpcode() == ISD::SDIV) {
TopPart = CurDAG->getTargetNode(V8::SRAri, MVT::i32, DivLHS,
CurDAG->getTargetConstant(31, MVT::i32));
} else {
TopPart = CurDAG->getRegister(V8::G0, MVT::i32);
}
TopPart = CurDAG->getTargetNode(V8::WRYrr, MVT::Flag, TopPart,
CurDAG->getRegister(V8::G0, MVT::i32));
// FIXME: Handle div by immediate.
unsigned Opcode = N->getOpcode() == ISD::SDIV ? V8::SDIVrr : V8::UDIVrr;
return CurDAG->SelectNodeTo(N, Opcode, MVT::i32, DivLHS, DivRHS, TopPart);
}
case ISD::MULHU:
case ISD::MULHS: {
// FIXME: Handle mul by immediate.
SDOperand MulLHS = Select(N->getOperand(0));
SDOperand MulRHS = Select(N->getOperand(1));
unsigned Opcode = N->getOpcode() == ISD::MULHU ? V8::UMULrr : V8::SMULrr;
SDOperand Mul = CurDAG->getTargetNode(Opcode, MVT::i32, MVT::Flag,
MulLHS, MulRHS);
// The high part is in the Y register.
return CurDAG->SelectNodeTo(N, V8::RDY, MVT::i32, Mul.getValue(1));
}
case ISD::RET: {
// FIXME: change this to use flag operands to allow autogen of ret.
if (N->getNumOperands() == 2) {
SDOperand Chain = Select(N->getOperand(0)); // Token chain.
SDOperand Val = Select(N->getOperand(1));
if (N->getOperand(1).getValueType() == MVT::i32) {
Chain = CurDAG->getCopyToReg(Chain, V8::I0, Val);
} else if (N->getOperand(1).getValueType() == MVT::f32) {
Chain = CurDAG->getCopyToReg(Chain, V8::F0, Val);
} else {
assert(N->getOperand(1).getValueType() == MVT::f64);
Chain = CurDAG->getCopyToReg(Chain, V8::D0, Val);
}
return CurDAG->SelectNodeTo(N, V8::RETL, MVT::Other, Chain);
} else if (N->getNumOperands() > 1) {
SDOperand Chain = Select(N->getOperand(0)); // Token chain.
assert(N->getOperand(1).getValueType() == MVT::i32 &&
N->getOperand(2).getValueType() == MVT::i32 &&
N->getNumOperands() == 3 && "Unknown two-register ret value!");
Chain = CurDAG->getCopyToReg(Chain, V8::I1, Select(N->getOperand(1)));
Chain = CurDAG->getCopyToReg(Chain, V8::I0, Select(N->getOperand(2)));
return CurDAG->SelectNodeTo(N, V8::RETL, MVT::Other, Chain);
}
break; // Generated code handles the void case.
}
case ISD::CALL:
// FIXME: This is a workaround for a bug in tblgen.
{ // Pattern #47: (call:Flag (tglobaladdr:i32):$dst, ICC:Flag)
// Emits: (CALL:void (tglobaladdr:i32):$dst)
// Pattern complexity = 2 cost = 1
SDOperand N1 = N->getOperand(1);
if (N1.getOpcode() != ISD::TargetGlobalAddress) goto P47Fail;
SDOperand N2 = N->getOperand(2);
SDOperand InFlag = SDOperand(0,0);
SDOperand Chain = N->getOperand(0);
SDOperand Tmp0 = N1;
Chain = Select(Chain);
InFlag = Select(N2);
SDOperand Result = CurDAG->getTargetNode(V8::CALL, MVT::Other, MVT::Flag, Tmp0, Chain, InFlag);
Chain = CodeGenMap[SDOperand(N, 0)] = Result.getValue(0);
CodeGenMap[SDOperand(N, 1)] = Result.getValue(1);
return Result.getValue(Op.ResNo);
}
P47Fail:;
}
return SelectCode(Op);
}
/// createPPCISelDag - This pass converts a legalized DAG into a
/// PowerPC-specific DAG, ready for instruction scheduling.
///
FunctionPass *llvm::createSparcV8ISelDag(TargetMachine &TM) {
return new SparcV8DAGToDAGISel(TM);
}
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