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Revert "LiveRangeCalc: Rewrite subrange calculation"

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Revert until I find out why non-subreg enabled targets break.

This reverts commit 6097277eef.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@224278 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Matthias Braun
2014-12-15 21:36:35 +00:00
parent 9f0d59ab46
commit 4151e89f1e
3 changed files with 245 additions and 155 deletions
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20
lib/CodeGen/LiveIntervalAnalysis.cpp
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@ -192,7 +192,8 @@ void LiveIntervals::computeVirtRegInterval(LiveInterval &LI) {
assert(LRCalc && "LRCalc not initialized.");
assert(LI.empty() && "Should only compute empty intervals.");
LRCalc->reset(MF, getSlotIndexes(), DomTree, &getVNInfoAllocator());
LRCalc->calculate(LI);
LRCalc->createDeadDefs(LI);
LRCalc->extendToUses(LI);
computeDeadValues(LI, LI);
}
@ -250,15 +251,22 @@ void LiveIntervals::computeRegUnitRange(LiveRange &LR, unsigned Unit) {
// may share super-registers. That's OK because createDeadDefs() is
// idempotent. It is very rare for a register unit to have multiple roots, so
// uniquing super-registers is probably not worthwhile.
for (MCRegUnitRootIterator Roots(Unit, TRI); Roots.isValid(); ++Roots) {
for (MCSuperRegIterator Supers(*Roots, TRI, /*IncludeSelf=*/true);
Supers.isValid(); ++Supers) {
if (!MRI->reg_empty(*Supers))
LRCalc->createDeadDefs(LR, *Supers);
}
}
// Now extend LR to reach all uses.
// Ignore uses of reserved registers. We only track defs of those.
for (MCRegUnitRootIterator Roots(Unit, TRI); Roots.isValid(); ++Roots) {
for (MCSuperRegIterator Supers(*Roots, TRI, /*IncludeSelf=*/true);
Supers.isValid(); ++Supers) {
unsigned Reg = *Supers;
if (MRI->reg_empty(Reg))
continue;
// Ignore uses of reserved registers. We only track defs of those.
bool IgnoreUses = MRI->isReserved(Reg);
LRCalc->calculate(LR, *Supers, IgnoreUses);
if (!MRI->isReserved(Reg) && !MRI->reg_empty(Reg))
LRCalc->extendToUses(LR, Reg);
}
}
}