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dynamic stack allocas 

llvm-svn: 20273
This commit is contained in:
Andrew Lenharth 2005-02-22 21:59:48 +00:00
parent a474313902
commit 7ac0143fa6
2 changed files with 155 additions and 66 deletions
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88
llvm/lib/Target/Alpha/AlphaISelPattern.cpp
View File

@ -26,6 +26,7 @@
#include "llvm/Target/TargetLowering.h"
#include "llvm/Support/MathExtras.h"
#include "llvm/ADT/Statistic.h"
#include "llvm/Support/Debug.h"
#include <set>
#include <algorithm>
using namespace llvm;
@ -156,7 +157,7 @@ AlphaTargetLowering::LowerArguments(Function &F, SelectionDAG &DAG)
BuildMI(&BB, Alpha::IDEF, 0, args_float[count]);
argVreg[count] =
MF.getSSARegMap()->createVirtualRegister(
getRegClassFor(getValueType(I->getType())));
getRegClassFor(getValueType(I->getType())));
argPreg[count] = args_float[count];
argOpc[count] = Alpha::CPYS;
argt = newroot = DAG.getCopyFromReg(argVreg[count],
@ -180,7 +181,6 @@ AlphaTargetLowering::LowerArguments(Function &F, SelectionDAG &DAG)
DAG.getNode(ISD::TRUNCATE, getValueType(I->getType()), newroot);
break;
}
++count;
} else { //more args
// Create the frame index object for this incoming parameter...
int FI = MFI->CreateFixedObject(8, 8 * (count - 6));
@ -191,19 +191,14 @@ AlphaTargetLowering::LowerArguments(Function &F, SelectionDAG &DAG)
argt = newroot = DAG.getLoad(getValueType(I->getType()),
DAG.getEntryNode(), FIN);
}
++count;
DAG.setRoot(newroot.getValue(1));
ArgValues.push_back(argt);
}
BuildMI(&BB, Alpha::IDEF, 0, Alpha::R29);
BuildMI(&BB, Alpha::BIS, 2, GP).addReg(Alpha::R29).addReg(Alpha::R29);
for (int i = 0; i < count; ++i) {
if (argPreg[i] == Alpha::F16 || argPreg[i] == Alpha::F17 ||
argPreg[i] == Alpha::F18 || argPreg[i] == Alpha::F19 ||
argPreg[i] == Alpha::F20 || argPreg[i] == Alpha::F21)
{
assert(argOpc[i] == Alpha::CPYS && "Using BIS for a float??");
}
for (int i = 0; i < count && i < 6; ++i) {
BuildMI(&BB, argOpc[i], 2,
argVreg[i]).addReg(argPreg[i]).addReg(argPreg[i]);
}
@ -311,6 +306,7 @@ public:
/// InstructionSelectBasicBlock - This callback is invoked by
/// SelectionDAGISel when it has created a SelectionDAG for us to codegen.
virtual void InstructionSelectBasicBlock(SelectionDAG &DAG) {
DEBUG(BB->dump());
// Codegen the basic block.
Select(DAG.getRoot());
@ -570,8 +566,9 @@ unsigned ISel::SelectExprFP(SDOperand N, unsigned Result)
BuildMI(BB, Opc, 1, Result).addConstantPoolIndex(CP->getIndex());
}
else if(Address.getOpcode() == ISD::FrameIndex) {
Tmp1 = cast<FrameIndexSDNode>(Address)->getIndex();
BuildMI(BB, Opc, 2, Result).addFrameIndex(Tmp1).addReg(Alpha::F31);
BuildMI(BB, Opc, 2, Result)
.addFrameIndex(cast<FrameIndexSDNode>(Address)->getIndex())
.addReg(Alpha::F31);
} else {
long offset;
SelectAddr(Address, Tmp1, offset);
@ -636,7 +633,9 @@ unsigned ISel::SelectExprFP(SDOperand N, unsigned Result)
}
else if(Address.getOpcode() == ISD::FrameIndex) {
Tmp2 = cast<FrameIndexSDNode>(Address)->getIndex();
BuildMI(BB, Alpha::LDS, 2, Tmp1).addFrameIndex(Tmp2).addReg(Alpha::F31);
BuildMI(BB, Alpha::LDS, 2, Tmp1)
.addFrameIndex(cast<FrameIndexSDNode>(Address)->getIndex())
.addReg(Alpha::F31);
} else {
long offset;
SelectAddr(Address, Tmp2, offset);
@ -723,6 +722,47 @@ unsigned ISel::SelectExpr(SDOperand N) {
Node->dump();
assert(0 && "Node not handled!\n");
case ISD::DYNAMIC_STACKALLOC:
// Generate both result values.
if (Result != 1)
ExprMap[N.getValue(1)] = 1; // Generate the token
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));
if (ConstantSDNode* CN = dyn_cast<ConstantSDNode>(N.getOperand(1)))
{
if (CN->getValue() < 32000)
{
BuildMI(BB, Alpha::LDA, 2, Alpha::R30)
.addImm(-CN->getValue()).addReg(Alpha::R30);
} else {
Tmp1 = SelectExpr(N.getOperand(1));
// Subtract size from stack pointer, thereby allocating some space.
BuildMI(BB, Alpha::SUBQ, 2, Alpha::R30).addReg(Alpha::R30).addReg(Tmp1);
}
} else {
Tmp1 = SelectExpr(N.getOperand(1));
// Subtract size from stack pointer, thereby allocating some space.
BuildMI(BB, Alpha::SUBQ, 2, Alpha::R30).addReg(Alpha::R30).addReg(Tmp1);
}
// Put a pointer to the space into the result register, by copying the stack
// pointer.
BuildMI(BB, Alpha::BIS, 1, Result).addReg(Alpha::R30).addReg(Alpha::R30);
return Result;
case ISD::ConstantPool:
Tmp1 = cast<ConstantPoolSDNode>(N)->getIndex();
AlphaLowering.restoreGP(BB);
@ -730,8 +770,9 @@ unsigned ISel::SelectExpr(SDOperand N) {
return Result;
case ISD::FrameIndex:
Tmp1 = cast<FrameIndexSDNode>(N)->getIndex();
BuildMI(BB, Alpha::LDA, 2, Result).addFrameIndex(Tmp1).addReg(Alpha::F31);
BuildMI(BB, Alpha::LDA, 2, Result)
.addFrameIndex(cast<FrameIndexSDNode>(N)->getIndex())
.addReg(Alpha::F31);
return Result;
case ISD::EXTLOAD:
@ -776,8 +817,9 @@ unsigned ISel::SelectExpr(SDOperand N) {
BuildMI(BB, Opc, 1, Result).addConstantPoolIndex(CP->getIndex());
}
else if(Address.getOpcode() == ISD::FrameIndex) {
Tmp1 = cast<FrameIndexSDNode>(Address)->getIndex();
BuildMI(BB, Opc, 2, Result).addFrameIndex(Tmp1).addReg(Alpha::F31);
BuildMI(BB, Opc, 2, Result)
.addFrameIndex(cast<FrameIndexSDNode>(Address)->getIndex())
.addReg(Alpha::F31);
} else {
long offset;
SelectAddr(Address, Tmp1, offset);
@ -1111,14 +1153,16 @@ unsigned ISel::SelectExpr(SDOperand N) {
//Can only compare doubles, and dag won't promote for me
if (SetCC->getOperand(0).getValueType() == MVT::f32)
{
std::cerr << "Setcc On float?\n";
//assert(0 && "Setcc On float?\n");
std::cerr << "Setcc on float!\n";
Tmp3 = MakeReg(MVT::f64);
BuildMI(BB, Alpha::CVTST, 1, Tmp3).addReg(Tmp1);
Tmp1 = Tmp3;
}
if (SetCC->getOperand(1).getValueType() == MVT::f32)
{
std::cerr << "Setcc On float?\n";
//assert (0 && "Setcc On float?\n");
std::cerr << "Setcc on float!\n";
Tmp3 = MakeReg(MVT::f64);
BuildMI(BB, Alpha::CVTST, 1, Tmp3).addReg(Tmp2);
Tmp2 = Tmp3;
@ -1338,7 +1382,6 @@ void ISel::Select(SDOperand N) {
SDNode *Node = N.Val;
switch (opcode) {
default:
@ -1457,8 +1500,9 @@ void ISel::Select(SDOperand N) {
}
else if(Address.getOpcode() == ISD::FrameIndex)
{
Tmp2 = cast<FrameIndexSDNode>(Address)->getIndex();
BuildMI(BB, Opc, 3).addReg(Tmp1).addFrameIndex(Tmp2).addReg(Alpha::F31);
BuildMI(BB, Opc, 3).addReg(Tmp1)
.addFrameIndex(cast<FrameIndexSDNode>(Address)->getIndex())
.addReg(Alpha::F31);
}
else
{
@ -1475,7 +1519,7 @@ void ISel::Select(SDOperand N) {
case ISD::LOAD:
case ISD::CopyFromReg:
case ISD::CALL:
// case ISD::DYNAMIC_STACKALLOC:
case ISD::DYNAMIC_STACKALLOC:
ExprMap.erase(N);
SelectExpr(N);
return;

133
llvm/lib/Target/Alpha/AlphaRegisterInfo.cpp
View File

@ -30,6 +30,21 @@
#include <iostream>
using namespace llvm;
static long getLower16(long l)
{
long y = l / 65536;
if (l % 65536 > 32767)
++y;
return l - y * 65536;
}
static long getUpper16(long l)
{
long y = l / 65536;
if (l % 65536 > 32767)
++y;
return y;
}
AlphaRegisterInfo::AlphaRegisterInfo()
: AlphaGenRegisterInfo(Alpha::ADJUSTSTACKDOWN, Alpha::ADJUSTSTACKUP)
@ -102,7 +117,6 @@ void AlphaRegisterInfo::
eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
MachineBasicBlock::iterator I) const {
if (hasFP(MF)) {
assert(0 && "TODO");
// If we have a frame pointer, turn the adjcallstackup instruction into a
// 'sub ESP, <amt>' and the adjcallstackdown instruction into 'add ESP,
// <amt>'
@ -115,32 +129,40 @@ eliminateCallFramePseudoInstr(MachineFunction &MF, MachineBasicBlock &MBB,
unsigned Align = MF.getTarget().getFrameInfo()->getStackAlignment();
Amount = (Amount+Align-1)/Align*Align;
// MachineInstr *New;
// if (Old->getOpcode() == X86::ADJCALLSTACKDOWN) {
// New=BuildMI(X86::SUB32ri, 1, X86::ESP, MachineOperand::UseAndDef)
// .addZImm(Amount);
// } else {
// assert(Old->getOpcode() == X86::ADJCALLSTACKUP);
// New=BuildMI(X86::ADD32ri, 1, X86::ESP, MachineOperand::UseAndDef)
// .addZImm(Amount);
// }
MachineInstr *New;
if (Old->getOpcode() == Alpha::ADJUSTSTACKDOWN) {
New=BuildMI(Alpha::LDA, 2, Alpha::R30)
.addImm(-Amount).addReg(Alpha::R30);
} else {
assert(Old->getOpcode() == Alpha::ADJUSTSTACKUP);
New=BuildMI(Alpha::LDA, 2, Alpha::R30)
.addImm(Amount).addReg(Alpha::R30);
}
// Replace the pseudo instruction with a new instruction...
//MBB.insert(I, New);
abort();
MBB.insert(I, New);
}
}
MBB.erase(I);
}
//Alpha has a slightly funny stack:
//Args
//<- incoming SP
//fixed locals (and spills, callee saved, etc)
//<- FP
//variable locals
//<- SP
void
AlphaRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II) const {
unsigned i = 0;
MachineInstr &MI = *II;
MachineBasicBlock &MBB = *MI.getParent();
MachineFunction &MF = *MBB.getParent();
bool FP = hasFP(MF);
while (!MI.getOperand(i).isFrameIndex()) {
++i;
assert(i < MI.getNumOperands() && "Instr doesn't have FrameIndex operand!");
@ -149,22 +171,32 @@ AlphaRegisterInfo::eliminateFrameIndex(MachineBasicBlock::iterator II) const {
int FrameIndex = MI.getOperand(i).getFrameIndex();
// Add the base register of R30 (SP) or R15 (FP).
MI.SetMachineOperandReg(i + 1, hasFP(MF) ? Alpha::R15 : Alpha::R30);
MI.SetMachineOperandReg(i + 1, FP ? Alpha::R15 : Alpha::R30);
// Now add the frame object offset to the offset from r1.
// Now add the frame object offset to the offset from the virtual frame index.
int Offset = MF.getFrameInfo()->getObjectOffset(FrameIndex);
// If we're not using a Frame Pointer that has been set to the value of the
// SP before having the stack size subtracted from it, then add the stack size
// to Offset to get the correct offset.
Offset += MF.getFrameInfo()->getStackSize();
DEBUG(std::cerr << "FI: " << FrameIndex << " Offset: " << Offset << "\n");
if (Offset > 32767 || Offset < -32768) {
std::cerr << "Offset needs to be " << Offset << "\n";
assert(0 && "stack too big");
} else {
MI.SetMachineOperandConst(i, MachineOperand::MO_SignExtendedImmed, Offset);
}
Offset += MF.getFrameInfo()->getStackSize();
DEBUG(std::cerr << "Corrected Offset " << Offset <<
" for stack size: " << MF.getFrameInfo()->getStackSize() << "\n");
if (Offset > 32767 || Offset < -32768) {
//so in this case, we need to use a temporary register, and move the original
//inst off the SP/FP
//fix up the old:
MI.SetMachineOperandReg(i + 1, Alpha::R28);
MI.SetMachineOperandConst(i, MachineOperand::MO_SignExtendedImmed,
getLower16(Offset));
//insert the new
MachineInstr* nMI=BuildMI(Alpha::LDAH, 2, Alpha::R28)
.addImm(getUpper16(Offset)).addReg(FP ? Alpha::R15 : Alpha::R30);
MBB.insert(--II, nMI);
} else {
MI.SetMachineOperandConst(i, MachineOperand::MO_SignExtendedImmed, Offset);
}
}
@ -173,6 +205,7 @@ void AlphaRegisterInfo::emitPrologue(MachineFunction &MF) const {
MachineBasicBlock::iterator MBBI = MBB.begin();
MachineFrameInfo *MFI = MF.getFrameInfo();
MachineInstr *MI;
bool FP = hasFP(MF);
//handle GOP offset
MI = BuildMI(Alpha::LDGP, 0);
@ -181,42 +214,48 @@ void AlphaRegisterInfo::emitPrologue(MachineFunction &MF) const {
// Get the number of bytes to allocate from the FrameInfo
unsigned NumBytes = MFI->getStackSize();
if (MFI->hasCalls()) {
if (MFI->hasCalls() && !FP) {
// We reserve argument space for call sites in the function immediately on
// entry to the current function. This eliminates the need for add/sub
// brackets around call sites.
//If there is a frame pointer, then we don't do this
NumBytes += MFI->getMaxCallFrameSize();
std::cerr << "Added " << MFI->getMaxCallFrameSize() << " to the stack due to calls\n";
}
if (FP)
NumBytes += 8; //reserve space for the old FP
// Do we need to allocate space on the stack?
if (NumBytes == 0) return;
// Add the size of R30 to NumBytes size for the store of R30 to the
// stack
// std::cerr << "Spillsize of R30 is " << getSpillSize(Alpha::R30) << "\n";
// NumBytes = NumBytes + getSpillSize(Alpha::R30)/8;
// Update frame info to pretend that this is part of the stack...
MFI->setStackSize(NumBytes);
// adjust stack pointer: r30 -= numbytes
if (NumBytes <= 32767) {
MI=BuildMI(Alpha::LDA, 2, Alpha::R30).addImm(-NumBytes).addReg(Alpha::R30);
MBB.insert(MBBI, MI);
} else if ((unsigned long)NumBytes <= (unsigned long)32767 * (unsigned long)65536) {
long y = NumBytes / 65536;
if (NumBytes % 65536 > 32767)
++y;
MI=BuildMI(Alpha::LDAH, 2, Alpha::R30).addImm(-y).addReg(Alpha::R30);
MI=BuildMI(Alpha::LDAH, 2, Alpha::R30).addImm(getUpper16(-NumBytes)).addReg(Alpha::R30);
MBB.insert(MBBI, MI);
MI=BuildMI(Alpha::LDA, 2, Alpha::R30).addImm(-(NumBytes - y * 65536)).addReg(Alpha::R30);
MI=BuildMI(Alpha::LDA, 2, Alpha::R30).addImm(getLower16(-NumBytes)).addReg(Alpha::R30);
MBB.insert(MBBI, MI);
} else {
std::cerr << "Too big a stack frame at " << NumBytes << "\n";
abort();
}
//now if we need to, save the old FP and set the new
if (FP)
{
MI=BuildMI(Alpha::STQ, 3).addReg(Alpha::R15).addImm(0).addReg(Alpha::R30);
MBB.insert(MBBI, MI);
//this must be the last instr in the prolog
MI=BuildMI(Alpha::BIS, 2, Alpha::R15).addReg(Alpha::R30).addReg(Alpha::R30);
MBB.insert(MBBI, MI);
}
}
void AlphaRegisterInfo::emitEpilogue(MachineFunction &MF,
@ -227,21 +266,27 @@ void AlphaRegisterInfo::emitEpilogue(MachineFunction &MF,
assert((MBBI->getOpcode() == Alpha::RET || MBBI->getOpcode() == Alpha::RETURN) &&
"Can only insert epilog into returning blocks");
bool FP = hasFP(MF);
// Get the number of bytes allocated from the FrameInfo...
unsigned NumBytes = MFI->getStackSize();
//now if we need to, restore the old FP
if (FP)
{
MI=BuildMI(Alpha::LDQ, 2, Alpha::R15).addImm(0).addReg(Alpha::R15);
MBB.insert(MBBI, MI);
}
if (NumBytes != 0)
{
if (NumBytes <= 32767) {
MI=BuildMI(Alpha::LDA, 2, Alpha::R30).addImm(NumBytes).addReg(Alpha::R30);
MBB.insert(MBBI, MI);
} else if ((unsigned long)NumBytes <= (unsigned long)32767 * (unsigned long)65536) {
long y = NumBytes / 65536;
if (NumBytes % 65536 > 32767)
++y;
MI=BuildMI(Alpha::LDAH, 2, Alpha::R30).addImm(y).addReg(Alpha::R30);
MI=BuildMI(Alpha::LDAH, 2, Alpha::R30).addImm(getUpper16(NumBytes)).addReg(Alpha::R30);
MBB.insert(MBBI, MI);
MI=BuildMI(Alpha::LDA, 2, Alpha::R30).addImm(NumBytes - y * 65536).addReg(Alpha::R30);
MI=BuildMI(Alpha::LDA, 2, Alpha::R30).addImm(getLower16(NumBytes)).addReg(Alpha::R30);
MBB.insert(MBBI, MI);
} else {
std::cerr << "Too big a stack frame at " << NumBytes << "\n";