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When a variable is killed and redifined in a basic block only one

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killing instruction is tracked. This causes the LiveIntervals to
create bogus intervals. The workaound is to add a range to the
interval from the redefinition to the end of the basic block.

llvm-svn: 10510
This commit is contained in:
Alkis Evlogimenos 2003-12-18 08:53:43 +00:00
parent 8e2fcc7d79
commit 382bfbffeb
1 changed files with 4 additions and 1 deletions
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5
lib/CodeGen/LiveIntervals.cpp
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@ -152,11 +152,14 @@ void LiveIntervals::handleVirtualRegisterDef(MachineBasicBlock* mbb,
for (int i = 0, e = vi.Kills.size(); i != e; ++i) {
MachineBasicBlock* killerBlock = vi.Kills[i].first;
MachineInstr* killerInstr = vi.Kills[i].second;
killedInDefiningBasicBlock |= mbb == killerBlock;
unsigned start = (mbb == killerBlock ?
instrIndex :
getInstructionIndex(killerBlock->front()));
unsigned end = getInstructionIndex(killerInstr) + 1;
if (start < end) {
killedInDefiningBasicBlock |= mbb == killerBlock;
interval->addRange(start, end);
}
}
if (!killedInDefiningBasicBlock) {