JumpTable support! What this represents is working asm and jit support for
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
diff --git a/lib/Target/PowerPC/PPCCodeEmitter.cpp b/lib/Target/PowerPC/PPCCodeEmitter.cpp
index 8d4e1b6..c7f2acb 100644
--- a/lib/Target/PowerPC/PPCCodeEmitter.cpp
+++ b/lib/Target/PowerPC/PPCCodeEmitter.cpp
@@ -34,7 +34,7 @@
// 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 @@
"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 @@
} 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 @@
// 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";