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Be a little smarter on the way we handle physical register defs.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@11038 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Alkis Evlogimenos 2004-01-31 23:13:30 +00:00
parent ef09c63e7b
commit 02ba13c989
1 changed files with 13 additions and 26 deletions
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39
lib/CodeGen/LiveIntervalAnalysis.cpp
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@ -210,49 +210,36 @@ void LiveIntervals::handlePhysicalRegisterDef(MachineBasicBlock* mbb,
MachineBasicBlock::iterator mi,
unsigned reg)
{
typedef LiveVariables::killed_iterator KillIter;
DEBUG(std::cerr << "\t\tregister: "; printRegName(reg));
MachineBasicBlock::iterator e = mbb->end();
unsigned start = getInstructionIndex(*mi);
unsigned end = start;
unsigned end = start + 1;
// register can be dead by the instruction defining it but it can
// only be killed by subsequent instructions
for (LiveVariables::killed_iterator
ki = lv_->dead_begin(*mi),
ke = lv_->dead_end(*mi);
// a variable can be dead by the instruction defining it
for (KillIter ki = lv_->dead_begin(*mi), ke = lv_->dead_end(*mi);
ki != ke; ++ki) {
if (reg == ki->second) {
end = getInstructionIndex(ki->first) + 1;
DEBUG(std::cerr << " dead\n");
goto exit;
}
}
++mi;
for (MachineBasicBlock::iterator e = mbb->end(); mi != e; ++mi) {
for (LiveVariables::killed_iterator
ki = lv_->dead_begin(*mi),
ke = lv_->dead_end(*mi);
// a variable can only be killed by subsequent instructions
do {
++mi;
++end;
for (KillIter ki = lv_->killed_begin(*mi), ke = lv_->killed_end(*mi);
ki != ke; ++ki) {
if (reg == ki->second) {
end = getInstructionIndex(ki->first) + 1;
DEBUG(std::cerr << " dead\n");
goto exit;
}
}
for (LiveVariables::killed_iterator
ki = lv_->killed_begin(*mi),
ke = lv_->killed_end(*mi);
ki != ke; ++ki) {
if (reg == ki->second) {
end = getInstructionIndex(ki->first) + 1;
DEBUG(std::cerr << " killed\n");
goto exit;
}
}
}
} while (mi != e);
exit:
assert(start < end && "did not find end of interval?");