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LiveInterval: Add a 'covers' operation to LiveRange.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223876 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Matthias Braun
2014-12-10 01:12:06 +00:00
parent fd9bbbb541
commit 5874714ac3
2 changed files with 27 additions and 0 deletions
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21
lib/CodeGen/LiveInterval.cpp
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@@ -185,6 +185,27 @@ bool LiveRange::overlaps(SlotIndex Start, SlotIndex End) const {
return I != begin() && (--I)->end > Start;
}
bool LiveRange::covers(const LiveRange &Other) const {
if (empty())
return Other.empty();
const_iterator I = begin();
for (const_iterator O = Other.begin(), OE = Other.end(); O != OE; ++O) {
I = advanceTo(I, O->start);
if (I == end() || I->start > O->start)
return false;
// Check adjacent live segments and see if we can get behind O->end.
while (I->end < O->end) {
const_iterator Last = I;
// Get next segment and abort if it was not adjacent.
++I;
if (I == end() || Last->end != I->start)
return false;
}
}
return true;
}
/// ValNo is dead, remove it. If it is the largest value number, just nuke it
/// (and any other deleted values neighboring it), otherwise mark it as ~1U so