6502/llvm-6502
1
0
Fork 0
mirror of https://github.com/c64scene-ar/llvm-6502.git synced 2025-06-13 04:38:24 +00:00
Code Issues Projects Releases Wiki Activity

Add support for updating the LiveIntervals of registers used by 'exotic'

Browse Source 
terminators that actually have register uses when splitting critical edges.

This commit also introduces a method repairIntervalsInRange() on LiveIntervals,
which allows for repairing LiveIntervals in a small range after an arbitrary
target hook modifies, inserts, and removes instructions. It's pretty limited
right now, but I hope to extend it to support all of the things that are done
by the convertToThreeAddress() target hooks.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@175382 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Cameron Zwarich
2013-02-17 00:10:44 +00:00
parent cc54889cd5
commit f0b2535344
3 changed files with 80 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

36
lib/CodeGen/LiveIntervalAnalysis.cpp
View File

@ -1032,3 +1032,39 @@ void LiveIntervals::handleMoveIntoBundle(MachineInstr* MI,
HMEditor HME(*this, *MRI, *TRI, OldIndex, NewIndex, UpdateFlags);
HME.updateAllRanges(MI);
}
void
LiveIntervals::repairIntervalsInRange(MachineBasicBlock *MBB,
MachineBasicBlock::reverse_iterator RBegin,
MachineBasicBlock::reverse_iterator REnd,
SmallVectorImpl<unsigned> &OrigRegs) {
for (unsigned i = 0, e = OrigRegs.size(); i != e; ++i) {
unsigned Reg = OrigRegs[i];
if (!TargetRegisterInfo::isVirtualRegister(Reg))
continue;
LiveInterval &LI = getInterval(Reg);
SlotIndex startIdx = (REnd == MBB->rend()) ? getMBBStartIdx(MBB)
: getInstructionIndex(&*REnd);
for (MachineBasicBlock::reverse_iterator I = RBegin; I != REnd; ++I) {
MachineInstr *MI = &*I;
SlotIndex instrIdx = getInstructionIndex(MI);
for (MachineInstr::mop_iterator OI = MI->operands_begin(),
OE = MI->operands_end(); OI != OE; ++OI) {
const MachineOperand &MO = *OI;
if (!MO.isReg() || MO.getReg() != Reg)
continue;
assert(MO.isUse() && "Register defs are not yet supported.");
if (!LI.liveAt(instrIdx)) {
LiveRange *LR = LI.getLiveRangeContaining(startIdx.getRegSlot());
assert(LR && "Used registers must be live-in.");
LR->end = instrIdx.getRegSlot();
break;
}
}
}
}
}