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Code to maintain kill information during register coalescing.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@41016 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng
2007-08-11 00:59:19 +00:00
parent a1eb155e52
commit 4f8ff168de
4 changed files with 205 additions and 45 deletions
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12
lib/CodeGen/LiveIntervalAnalysis.cpp
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@ -437,6 +437,9 @@ void LiveIntervals::handleVirtualRegisterDef(MachineBasicBlock *mbb,
unsigned DefIndex = getDefIndex(getInstructionIndex(vi.DefInst));
unsigned RedefIndex = getDefIndex(MIIdx);
const LiveRange *OldLR = interval.getLiveRangeContaining(RedefIndex-1);
unsigned OldEnd = OldLR->end;
// Delete the initial value, which should be short and continuous,
// because the 2-addr copy must be in the same MBB as the redef.
interval.removeRange(DefIndex, RedefIndex);
@ -448,16 +451,18 @@ void LiveIntervals::handleVirtualRegisterDef(MachineBasicBlock *mbb,
// The new value number (#1) is defined by the instruction we claimed
// defined value #0.
unsigned ValNo = interval.getNextValue(0, 0);
interval.setValueNumberInfo(1, interval.getValNumInfo(0));
interval.copyValNumInfo(ValNo, 0);
// Value#0 is now defined by the 2-addr instruction.
interval.setValueNumberInfo(0, LiveInterval::VNInfo(DefIndex, 0U));
interval.setDefForValNum(0, RedefIndex);
interval.setSrcRegForValNum(0, 0);
// Add the new live interval which replaces the range for the input copy.
LiveRange LR(DefIndex, RedefIndex, ValNo);
DOUT << " replace range with " << LR;
interval.addRange(LR);
interval.addKillForValNum(ValNo, RedefIndex);
interval.removeKillForValNum(ValNo, RedefIndex, OldEnd);
// If this redefinition is dead, we need to add a dummy unit live
// range covering the def slot.
@ -482,8 +487,7 @@ void LiveIntervals::handleVirtualRegisterDef(MachineBasicBlock *mbb,
DOUT << " Removing [" << Start << "," << End << "] from: ";
interval.print(DOUT, mri_); DOUT << "\n";
interval.removeRange(Start, End);
bool replaced = interval.replaceKillForValNum(0, End, Start);
assert(replaced && "Incorrect kill info?");
interval.addKillForValNum(0, Start);
DOUT << " RESULT: "; interval.print(DOUT, mri_);
// Replace the interval with one of a NEW value number. Note that this