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Fix a potential serious problem where kills belonging to the val# defined by a two-address instruction is also on the val# that defines the input.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@47057 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Evan Cheng 2008-02-13 09:06:18 +00:00
parent e35a6d1dfb
commit e984e504b5
1 changed files with 2 additions and 3 deletions
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5
lib/CodeGen/LiveIntervalAnalysis.cpp
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@ -315,7 +315,6 @@ void LiveIntervals::handleVirtualRegisterDef(MachineBasicBlock *mbb,
const LiveRange *OldLR = interval.getLiveRangeContaining(RedefIndex-1);
VNInfo *OldValNo = OldLR->valno;
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.
@ -328,7 +327,8 @@ void LiveIntervals::handleVirtualRegisterDef(MachineBasicBlock *mbb,
// The new value number (#1) is defined by the instruction we claimed
// defined value #0.
VNInfo *ValNo = interval.getNextValue(0, 0, VNInfoAllocator);
interval.copyValNumInfo(ValNo, OldValNo);
ValNo->def = OldValNo->def;
ValNo->reg = OldValNo->reg;
// Value#0 is now defined by the 2-addr instruction.
OldValNo->def = RedefIndex;
@ -339,7 +339,6 @@ void LiveIntervals::handleVirtualRegisterDef(MachineBasicBlock *mbb,
DOUT << " replace range with " << LR;
interval.addRange(LR);
interval.addKill(ValNo, RedefIndex);
interval.removeKills(ValNo, RedefIndex, OldEnd);
// If this redefinition is dead, we need to add a dummy unit live
// range covering the def slot.