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JumpTable support! What this represents is working asm and jit support for

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x86 and ppc for 100% dense switch statements when relocations are non-PIC.
This support will be extended and enhanced in the coming days to support
PIC, and less dense forms of jump tables.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@27947 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Nate Begeman
2006-04-22 18:53:45 +00:00
parent 1900c012f5
commit 37efe67645
40 changed files with 717 additions and 77 deletions
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lib/Target/PowerPC/PPCCodeEmitter.cpp
+10 -5
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@@ -34,7 +34,7 @@ namespace {
// Tracks which instruction references which BasicBlock
std::vector<std::pair<MachineBasicBlock*, unsigned*> > BBRefs;
// Tracks where each BasicBlock starts
std::map<MachineBasicBlock*, long> BBLocations;
std::map<MachineBasicBlock*, uint64_t> BBLocations;
/// getMachineOpValue - evaluates the MachineOperand of a given MachineInstr
///
@@ -91,8 +91,10 @@ bool PPCCodeEmitter::runOnMachineFunction(MachineFunction &MF) {
"JIT relocation model must be set to static or default!");
MCE.startFunction(MF);
MCE.emitConstantPool(MF.getConstantPool());
MCE.initJumpTableInfo(MF.getJumpTableInfo());
for (MachineFunction::iterator BB = MF.begin(), E = MF.end(); BB != E; ++BB)
emitBasicBlock(*BB);
MCE.emitJumpTableInfo(MF.getJumpTableInfo(), BBLocations);
MCE.finishFunction(MF);
// Resolve branches to BasicBlocks for the entire function
@@ -192,10 +194,13 @@ int PPCCodeEmitter::getMachineOpValue(MachineInstr &MI, MachineOperand &MO) {
} else if (MO.isMachineBasicBlock()) {
unsigned* CurrPC = (unsigned*)(intptr_t)MCE.getCurrentPCValue();
BBRefs.push_back(std::make_pair(MO.getMachineBasicBlock(), CurrPC));
} else if (MO.isConstantPoolIndex()) {
unsigned index = MO.getConstantPoolIndex();
} else if (MO.isConstantPoolIndex() || MO.isJumpTableIndex()) {
if (MO.isConstantPoolIndex())
rv = MCE.getConstantPoolEntryAddress(MO.getConstantPoolIndex());
else
rv = MCE.getJumpTableEntryAddress(MO.getJumpTableIndex());
unsigned Opcode = MI.getOpcode();
rv = MCE.getConstantPoolEntryAddress(index);
if (Opcode == PPC::LIS || Opcode == PPC::ADDIS) {
// lis wants hi16(addr)
if ((short)rv < 0) rv += 1 << 16;
@@ -206,7 +211,7 @@ int PPCCodeEmitter::getMachineOpValue(MachineInstr &MI, MachineOperand &MO) {
// These load opcodes want lo16(addr)
rv &= 0xffff;
} else {
assert(0 && "Unknown constant pool using instruction!");
assert(0 && "Unknown constant pool or jump table using instruction!");
}
} else {
std::cerr << "ERROR: Unknown type of MachineOperand: " << MO << "\n";