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Add an optional parameter with a list of undefs to extendToIndices 

llvm-svn: 280268
This commit is contained in:
Krzysztof Parzyszek 2016-08-31 18:02:19 +00:00
parent 9d0c945ad6
commit 576225daf5
2 changed files with 11 additions and 5 deletions
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11
llvm/include/llvm/CodeGen/LiveIntervalAnalysis.h
View File

@ -164,14 +164,19 @@ extern cl::opt<bool> UseSegmentSetForPhysRegs;
void shrinkToUses(LiveInterval::SubRange &SR, unsigned Reg);
/// Extend the live range @p LR to reach all points in @p Indices. The
/// points in the @p Indices array must be jointly dominated by existing
/// defs in @p LR. PHI-defs are added as needed to maintain SSA form.
/// points in the @p Indices array must be jointly dominated by the union
/// of the existing defs in @p LR and points in @p Undefs.
///
/// PHI-defs are added as needed to maintain SSA form.
///
/// If a SlotIndex in @p Indices is the end index of a basic block, @p LR
/// will be extended to be live out of the basic block.
/// If a SlotIndex in @p Indices is jointy dominated only by points in
/// @p Undefs, the live range will not be extended to that point.
///
/// See also LiveRangeCalc::extend().
void extendToIndices(LiveRange &LR, ArrayRef<SlotIndex> Indices);
void extendToIndices(LiveRange &LR, ArrayRef<SlotIndex> Indices,
ArrayRef<SlotIndex> Undefs = {});
/// If @p LR has a live value at @p Kill, prune its live range by removing
/// any liveness reachable from Kill. Add live range end points to

5
llvm/lib/CodeGen/LiveIntervalAnalysis.cpp
View File

@ -568,11 +568,12 @@ void LiveIntervals::shrinkToUses(LiveInterval::SubRange &SR, unsigned Reg) {
}
void LiveIntervals::extendToIndices(LiveRange &LR,
ArrayRef<SlotIndex> Indices) {
ArrayRef<SlotIndex> Indices,
ArrayRef<SlotIndex> Undefs) {
assert(LRCalc && "LRCalc not initialized.");
LRCalc->reset(MF, getSlotIndexes(), DomTree, &getVNInfoAllocator());
for (unsigned i = 0, e = Indices.size(); i != e; ++i)
LRCalc->extend(LR, Indices[i], /*PhysReg=*/0, /*Undefs=*/{});
LRCalc->extend(LR, Indices[i], /*PhysReg=*/0, Undefs);
}
void LiveIntervals::pruneValue(LiveRange &LR, SlotIndex Kill,