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Implement more of the PPC32 Pattern ISel:

Browse Source 
1) dynamic stack alloc
2) loads
3) shifts
4) subtract
5) immediate form of add, and, or, xor
6) change flag from -pattern-isel to -enable-ppc-pattern-isel

Remove dead arguments from getGlobalBaseReg in the simple ISel

llvm-svn: 20810
This commit is contained in:
Nate Begeman 2005-03-24 06:28:42 +00:00
parent a42c4a0874
commit 833c1d0994
3 changed files with 125 additions and 36 deletions
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141
lib/Target/PowerPC/PPC32ISelPattern.cpp
View File

@ -2,7 +2,7 @@
//
// The LLVM Compiler Infrastructure
//
// This file was developed by the LLVM research group and is distributed under
// This file was developed by Nate Begeman and is distributed under
// the University of Illinois Open Source License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
@ -396,6 +396,7 @@ unsigned ISel::SelectExprFP(SDOperand N, unsigned Result)
return dyn_cast<RegSDNode>(Node)->getReg();
case ISD::LOAD:
case ISD::EXTLOAD:
abort();
case ISD::ConstantFP:
@ -417,9 +418,6 @@ unsigned ISel::SelectExprFP(SDOperand N, unsigned Result)
BuildMI(BB, Opc, 2, Result).addReg(Tmp1).addReg(Tmp2);
return Result;
case ISD::EXTLOAD:
abort();
case ISD::UINT_TO_FP:
case ISD::SINT_TO_FP:
abort();
@ -455,7 +453,28 @@ unsigned ISel::SelectExpr(SDOperand N) {
assert(0 && "Node not handled!\n");
case ISD::DYNAMIC_STACKALLOC:
// Generate both result values. FIXME: Need a better commment here?
if (Result != 1)
ExprMap[N.getValue(1)] = 1;
else
Result = ExprMap[N.getValue(0)] = MakeReg(N.getValue(0).getValueType());
// FIXME: We are currently ignoring the requested alignment for handling
// greater than the stack alignment. This will need to be revisited at some
// point. Align = N.getOperand(2);
if (!isa<ConstantSDNode>(N.getOperand(2)) ||
cast<ConstantSDNode>(N.getOperand(2))->getValue() != 0) {
std::cerr << "Cannot allocate stack object with greater alignment than"
<< " the stack alignment yet!";
abort();
}
Select(N.getOperand(0));
Tmp1 = SelectExpr(N.getOperand(1));
// Subtract size from stack pointer, thereby allocating some space.
BuildMI(BB, PPC::SUBF, 2, PPC::R1).addReg(Tmp1).addReg(PPC::R1);
// Put a pointer to the space into the result register by copying the SP
BuildMI(BB, PPC::OR, 2, Result).addReg(PPC::R1).addReg(PPC::R1);
return Result;
case ISD::ConstantPool:
abort();
@ -463,10 +482,50 @@ unsigned ISel::SelectExpr(SDOperand N) {
case ISD::FrameIndex:
abort();
case ISD::LOAD:
case ISD::EXTLOAD:
case ISD::ZEXTLOAD:
{
// Make sure we generate both values.
if (Result != 1)
ExprMap[N.getValue(1)] = 1; // Generate the token
else
Result = ExprMap[N.getValue(0)] = MakeReg(N.getValue(0).getValueType());
SDOperand Chain = N.getOperand(0);
SDOperand Address = N.getOperand(1);
Select(Chain);
switch (Node->getValueType(0)) {
default: assert(0 && "Cannot load this type!");
case MVT::i1:
case MVT::i8: Opc = PPC::LBZ; break;
case MVT::i16: Opc = PPC::LHZ; break;
case MVT::i32: Opc = PPC::LWZ; break;
}
if (Address.getOpcode() == ISD::GlobalAddress) { // FIXME
BuildMI(BB, Opc, 2, Result)
.addGlobalAddress(cast<GlobalAddressSDNode>(Address)->getGlobal())
.addReg(PPC::R1);
}
else if (ConstantPoolSDNode *CP = dyn_cast<ConstantPoolSDNode>(Address)) {
BuildMI(BB, Opc, 2, Result).addConstantPoolIndex(CP->getIndex())
.addReg(PPC::R1);
}
else if(Address.getOpcode() == ISD::FrameIndex) {
BuildMI(BB, Opc, 2, Result)
.addFrameIndex(cast<FrameIndexSDNode>(Address)->getIndex())
.addReg(PPC::R1);
} else {
int offset;
SelectAddr(Address, Tmp1, offset);
BuildMI(BB, Opc, 2, Result).addSImm(offset).addReg(Tmp1);
}
return Result;
}
case ISD::SEXTLOAD:
case ISD::LOAD:
case ISD::GlobalAddress:
case ISD::CALL:
abort();
@ -503,10 +562,39 @@ unsigned ISel::SelectExpr(SDOperand N) {
return Result;
case ISD::SHL:
Tmp1 = SelectExpr(N.getOperand(0));
if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(N.getOperand(1))) {
Tmp2 = CN->getValue() & 0x1F;
BuildMI(BB, PPC::RLWINM, 5, Result).addReg(Tmp1).addImm(Tmp2).addImm(0)
.addImm(31-Tmp2);
} else {
Tmp2 = SelectExpr(N.getOperand(1));
BuildMI(BB, PPC::SLW, 2, Result).addReg(Tmp1).addReg(Tmp2);
}
return Result;
case ISD::SRL:
Tmp1 = SelectExpr(N.getOperand(0));
if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(N.getOperand(1))) {
Tmp2 = CN->getValue() & 0x1F;
BuildMI(BB, PPC::RLWINM, 5, Result).addReg(Tmp1).addImm(32-Tmp2)
.addImm(Tmp2).addImm(31);
} else {
Tmp2 = SelectExpr(N.getOperand(1));
BuildMI(BB, PPC::SRW, 2, Result).addReg(Tmp1).addReg(Tmp2);
}
return Result;
case ISD::SRA:
case ISD::MUL:
abort();
Tmp1 = SelectExpr(N.getOperand(0));
if (ConstantSDNode *CN = dyn_cast<ConstantSDNode>(N.getOperand(1))) {
Tmp2 = CN->getValue() & 0x1F;
BuildMI(BB, PPC::SRAWI, 2, Result).addReg(Tmp1).addImm(Tmp2);
} else {
Tmp2 = SelectExpr(N.getOperand(1));
BuildMI(BB, PPC::SRAW, 2, Result).addReg(Tmp1).addReg(Tmp2);
}
return Result;
case ISD::ADD:
assert (DestType == MVT::i32 && "Only do arithmetic on i32s!");
@ -527,7 +615,11 @@ unsigned ISel::SelectExpr(SDOperand N) {
return Result;
case ISD::SUB:
abort();
assert (DestType == MVT::i32 && "Only do arithmetic on i32s!");
Tmp1 = SelectExpr(N.getOperand(0));
Tmp2 = SelectExpr(N.getOperand(1));
BuildMI(BB, PPC::SUBF, 2, Result).addReg(Tmp2).addReg(Tmp1);
return Result;
case ISD::AND:
case ISD::OR:
@ -539,31 +631,32 @@ unsigned ISel::SelectExpr(SDOperand N) {
case 0: // No immediate
Tmp2 = SelectExpr(N.getOperand(1));
switch (opcode) {
case ISD::AND: Tmp3 = PPC::AND; break;
case ISD::OR: Tmp3 = PPC::OR; break;
case ISD::XOR: Tmp3 = PPC::XOR; break;
case ISD::AND: Opc = PPC::AND; break;
case ISD::OR: Opc = PPC::OR; break;
case ISD::XOR: Opc = PPC::XOR; break;
}
BuildMI(BB, Tmp3, 2, Result).addReg(Tmp1).addReg(Tmp2);
BuildMI(BB, Opc, 2, Result).addReg(Tmp1).addReg(Tmp2);
break;
case 1: // Low immediate
switch (opcode) {
case ISD::AND: Tmp3 = PPC::ANDIo; break;
case ISD::OR: Tmp3 = PPC::ORI; break;
case ISD::XOR: Tmp3 = PPC::XORI; break;
case ISD::AND: Opc = PPC::ANDIo; break;
case ISD::OR: Opc = PPC::ORI; break;
case ISD::XOR: Opc = PPC::XORI; break;
}
BuildMI(BB, Tmp3, 2, Result).addReg(Tmp1).addImm(Tmp2);
BuildMI(BB, Opc, 2, Result).addReg(Tmp1).addImm(Tmp2);
break;
case 2: // Shifted immediate
switch (opcode) {
case ISD::AND: Tmp3 = PPC::ANDISo; break;
case ISD::OR: Tmp3 = PPC::ORIS; break;
case ISD::XOR: Tmp3 = PPC::XORIS; break;
case ISD::AND: Opc = PPC::ANDISo; break;
case ISD::OR: Opc = PPC::ORIS; break;
case ISD::XOR: Opc = PPC::XORIS; break;
}
BuildMI(BB, Tmp3, 2, Result).addReg(Tmp1).addImm(Tmp2);
BuildMI(BB, Opc, 2, Result).addReg(Tmp1).addImm(Tmp2);
break;
}
return Result;
case ISD::MUL:
case ISD::UREM:
case ISD::SREM:
case ISD::SDIV:
@ -590,9 +683,9 @@ unsigned ISel::SelectExpr(SDOperand N) {
if (v < 32768 && v >= -32768) {
BuildMI(BB, PPC::LI, 1, Result).addSImm(v);
} else {
unsigned Temp = MakeReg(MVT::i32);
BuildMI(BB, PPC::LIS, 1, Temp).addSImm(v >> 16);
BuildMI(BB, PPC::ORI, 2, Result).addReg(Temp).addImm(v & 0xFFFF);
Tmp1 = MakeReg(MVT::i32);
BuildMI(BB, PPC::LIS, 1, Tmp1).addSImm(v >> 16);
BuildMI(BB, PPC::ORI, 2, Result).addReg(Tmp1).addImm(v & 0xFFFF);
}
}
}
@ -631,7 +724,6 @@ void ISel::Select(SDOperand N) {
case ISD::BR: {
MachineBasicBlock *Dest =
cast<BasicBlockSDNode>(N.getOperand(1))->getBasicBlock();
Select(N.getOperand(0));
BuildMI(BB, PPC::B, 1).addMBB(Dest);
return;
@ -687,7 +779,6 @@ void ISel::Select(SDOperand N) {
}
BuildMI(BB, PPC::BLR, 0); // Just emit a 'ret' instruction
return;
case ISD::TRUNCSTORE:
case ISD::STORE:
{

10
lib/Target/PowerPC/PPC32ISelSimple.cpp
View File

@ -421,8 +421,7 @@ namespace {
/// base address to use for accessing globals into a register. Returns the
/// register containing the base address.
///
unsigned getGlobalBaseReg(MachineBasicBlock *MBB,
MachineBasicBlock::iterator IP);
unsigned getGlobalBaseReg();
/// copyConstantToRegister - Output the instructions required to put the
/// specified constant into the specified register.
@ -590,8 +589,7 @@ unsigned PPC32ISel::getFixedSizedAllocaFI(AllocaInst *AI) {
/// getGlobalBaseReg - Output the instructions required to put the
/// base address to use for accessing globals into a register.
///
unsigned PPC32ISel::getGlobalBaseReg(MachineBasicBlock *MBB,
MachineBasicBlock::iterator IP) {
unsigned PPC32ISel::getGlobalBaseReg() {
if (!GlobalBaseInitialized) {
// Insert the set of GlobalBaseReg into the first MBB of the function
MachineBasicBlock &FirstMBB = F->front();
@ -690,7 +688,7 @@ void PPC32ISel::copyConstantToRegister(MachineBasicBlock *MBB,
unsigned Opcode = (Ty == Type::FloatTy) ? PPC::LFS : PPC::LFD;
// Move value at base + distance into return reg
BuildMI(*MBB, IP, PPC::LOADHiAddr, 2, Reg1)
.addReg(getGlobalBaseReg(MBB, IP)).addConstantPoolIndex(CPI);
.addReg(getGlobalBaseReg()).addConstantPoolIndex(CPI);
BuildMI(*MBB, IP, Opcode, 2, R).addConstantPoolIndex(CPI).addReg(Reg1);
} else if (isa<ConstantPointerNull>(C)) {
// Copy zero (null pointer) to the register.
@ -703,7 +701,7 @@ void PPC32ISel::copyConstantToRegister(MachineBasicBlock *MBB,
// Move value at base + distance into return reg
BuildMI(*MBB, IP, PPC::LOADHiAddr, 2, TmpReg)
.addReg(getGlobalBaseReg(MBB, IP)).addGlobalAddress(GV);
.addReg(getGlobalBaseReg()).addGlobalAddress(GV);
if (GV->hasWeakLinkage() || GV->isExternal()) {
BuildMI(*MBB, IP, PPC::LWZ, 2, R).addGlobalAddress(GV).addReg(TmpReg);

4
lib/Target/PowerPC/PowerPCTargetMachine.cpp
View File

@ -37,8 +37,8 @@ namespace llvm {
cl::opt<bool> EnablePPCLSR("enable-lsr-for-ppc",
cl::desc("Enable LSR for PPC (beta option!)"),
cl::Hidden);
cl::opt<bool> EnablePatternISel("pattern-isel", cl::Hidden,
cl::desc("Enable the pattern isel XXX FIXME"));
cl::opt<bool> EnablePatternISel("enable-ppc-pattern-isel", cl::Hidden,
cl::desc("Enable the pattern isel"));
}
namespace {