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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.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@10510 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Alkis Evlogimenos 2003-12-18 08:53:43 +00:00
parent dd2cc65f34
commit 43f692f90f
1 changed files with 4 additions and 1 deletions

5
lib/CodeGen/LiveIntervalAnalysis.cpp

@ -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) {