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Move LiveIntervalMap::extendTo into LiveInterval itself.

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This method could probably be used by LiveIntervalAnalysis::shrinkToUses, and
now it can use extendIntervalEndTo() which coalesces ranges.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@126803 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2011-03-02 00:06:15 +00:00
parent edb87555e4
commit 9763e2bf39
4 changed files with 26 additions and 24 deletions
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5
include/llvm/CodeGen/LiveInterval.h
View File

@ -447,6 +447,11 @@ namespace llvm {
addRangeFrom(LR, ranges.begin());
}
/// extendInBlock - If this interval is live before UseIdx in the basic
/// block that starts at StartIdx, extend it to be live at UseIdx and return
/// the value. If there is no live range before UseIdx, return NULL.
VNInfo *extendInBlock(SlotIndex StartIdx, SlotIndex UseIdx);
/// join - Join two live intervals (this, and other) together. This applies
/// mappings to the value numbers in the LHS/RHS intervals as specified. If
/// the intervals are not joinable, this aborts.

16
lib/CodeGen/LiveInterval.cpp
View File

@ -291,6 +291,22 @@ LiveInterval::addRangeFrom(LiveRange LR, iterator From) {
return ranges.insert(it, LR);
}
/// extendInBlock - If this interval is live before UseIdx in the basic
/// block that starts at StartIdx, extend it to be live at UseIdx and return
/// the value. If there is no live range before UseIdx, return NULL.
VNInfo *LiveInterval::extendInBlock(SlotIndex StartIdx, SlotIndex UseIdx) {
if (empty())
return 0;
iterator I = std::upper_bound(begin(), end(), UseIdx);
if (I == begin())
return 0;
--I;
if (I->end <= StartIdx)
return 0;
if (I->end <= UseIdx)
extendIntervalEndTo(I, UseIdx.getNextSlot());
return I->valno;
}
/// removeRange - Remove the specified range from this interval. Note that
/// the range must be in a single LiveRange in its entirety.

24
lib/CodeGen/SplitKit.cpp
View File

@ -230,7 +230,7 @@ VNInfo *LiveIntervalMap::mapValue(const VNInfo *ParentVNI, SlotIndex Idx,
assert(IdxMBB && "No MBB at Idx");
// Is there a def in the same MBB we can extend?
if (VNInfo *VNI = extendTo(IdxMBB, Idx))
if (VNInfo *VNI = LI->extendInBlock(LIS.getMBBStartIdx(IdxMBB), Idx))
return VNI;
// Now for the fun part. We know that ParentVNI potentially has multiple defs,
@ -262,8 +262,10 @@ VNInfo *LiveIntervalMap::mapValue(const VNInfo *ParentVNI, SlotIndex Idx,
}
// Does Pred provide a live-out value?
SlotIndex Last = LIS.getMBBEndIdx(Pred).getPrevSlot();
if (VNInfo *VNI = extendTo(Pred, Last)) {
SlotIndex Start, Last;
tie(Start, Last) = LIS.getSlotIndexes()->getMBBRange(Pred);
Last = Last.getPrevSlot();
if (VNInfo *VNI = LI->extendInBlock(Start, Last)) {
MachineBasicBlock *DefMBB = LIS.getMBBFromIndex(VNI->def);
DEBUG(dbgs() << " found valno #" << VNI->id
<< " from BB#" << DefMBB->getNumber()
@ -429,22 +431,6 @@ void LiveIntervalMap::dumpCache() {
}
#endif
// extendTo - Find the last LI value defined in MBB at or before Idx. The
// ParentLI is assumed to be live at Idx. Extend the live range to Idx.
// Return the found VNInfo, or NULL.
VNInfo *LiveIntervalMap::extendTo(const MachineBasicBlock *MBB, SlotIndex Idx) {
assert(LI && "call reset first");
LiveInterval::iterator I = std::upper_bound(LI->begin(), LI->end(), Idx);
if (I == LI->begin())
return 0;
--I;
if (I->end <= LIS.getMBBStartIdx(MBB))
return 0;
if (I->end <= Idx)
I->end = Idx.getNextSlot();
return I->valno;
}
//===----------------------------------------------------------------------===//
// Split Editor

5
lib/CodeGen/SplitKit.h
View File

@ -205,11 +205,6 @@ public:
/// If simple is not NULL, *simple will indicate if ParentVNI is a simply
/// mapped value.
VNInfo *mapValue(const VNInfo *ParentVNI, SlotIndex Idx, bool *simple = 0);
// extendTo - Find the last LI value defined in MBB at or before Idx. The
// parentli is assumed to be live at Idx. Extend the live range to include
// Idx. Return the found VNInfo, or NULL.
VNInfo *extendTo(const MachineBasicBlock *MBB, SlotIndex Idx);
};