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Remove dead code.

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Clobber ranges are no longer used when joining physical registers.
Instead, all aliases are checked for interference.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@113084 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Jakob Stoklund Olesen 2010-09-04 21:09:33 +00:00
parent 061d21eaf8
commit 07c2b7ff68
2 changed files with 0 additions and 112 deletions
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15
include/llvm/CodeGen/LiveInterval.h
View File

@ -358,21 +358,6 @@ namespace llvm {
/// cause merging of V1/V2 values numbers and compaction of the value space.
VNInfo* MergeValueNumberInto(VNInfo *V1, VNInfo *V2);
/// MergeInClobberRanges - For any live ranges that are not defined in the
/// current interval, but are defined in the Clobbers interval, mark them
/// used with an unknown definition value. Caller must pass in reference to
/// VNInfoAllocator since it will create a new val#.
void MergeInClobberRanges(LiveIntervals &li_,
const LiveInterval &Clobbers,
VNInfo::Allocator &VNInfoAllocator);
/// MergeInClobberRange - Same as MergeInClobberRanges except it merge in a
/// single LiveRange only.
void MergeInClobberRange(LiveIntervals &li_,
SlotIndex Start,
SlotIndex End,
VNInfo::Allocator &VNInfoAllocator);
/// MergeValueInAsValue - Merge all of the live ranges of a specific val#
/// in RHS into this live interval as the specified value number.
/// The LiveRanges in RHS are allowed to overlap with LiveRanges in the

97
lib/CodeGen/LiveInterval.cpp
View File

@ -616,103 +616,6 @@ void LiveInterval::MergeValueInAsValue(
}
/// MergeInClobberRanges - For any live ranges that are not defined in the
/// current interval, but are defined in the Clobbers interval, mark them
/// used with an unknown definition value.
void LiveInterval::MergeInClobberRanges(LiveIntervals &li_,
const LiveInterval &Clobbers,
VNInfo::Allocator &VNInfoAllocator) {
if (Clobbers.empty()) return;
DenseMap<VNInfo*, VNInfo*> ValNoMaps;
VNInfo *UnusedValNo = 0;
iterator IP = begin();
for (const_iterator I = Clobbers.begin(), E = Clobbers.end(); I != E; ++I) {
// For every val# in the Clobbers interval, create a new "unknown" val#.
VNInfo *ClobberValNo = 0;
DenseMap<VNInfo*, VNInfo*>::iterator VI = ValNoMaps.find(I->valno);
if (VI != ValNoMaps.end())
ClobberValNo = VI->second;
else if (UnusedValNo)
ClobberValNo = UnusedValNo;
else {
UnusedValNo = ClobberValNo =
getNextValue(li_.getInvalidIndex(), 0, false, VNInfoAllocator);
ValNoMaps.insert(std::make_pair(I->valno, ClobberValNo));
}
bool Done = false;
SlotIndex Start = I->start, End = I->end;
// If a clobber range starts before an existing range and ends after
// it, the clobber range will need to be split into multiple ranges.
// Loop until the entire clobber range is handled.
while (!Done) {
Done = true;
IP = std::upper_bound(IP, end(), Start);
SlotIndex SubRangeStart = Start;
SlotIndex SubRangeEnd = End;
// If the start of this range overlaps with an existing liverange, trim it.
if (IP != begin() && IP[-1].end > SubRangeStart) {
SubRangeStart = IP[-1].end;
// Trimmed away the whole range?
if (SubRangeStart >= SubRangeEnd) continue;
}
// If the end of this range overlaps with an existing liverange, trim it.
if (IP != end() && SubRangeEnd > IP->start) {
// If the clobber live range extends beyond the existing live range,
// it'll need at least another live range, so set the flag to keep
// iterating.
if (SubRangeEnd > IP->end) {
Start = IP->end;
Done = false;
}
SubRangeEnd = IP->start;
// If this trimmed away the whole range, ignore it.
if (SubRangeStart == SubRangeEnd) continue;
}
// Insert the clobber interval.
IP = addRangeFrom(LiveRange(SubRangeStart, SubRangeEnd, ClobberValNo),
IP);
UnusedValNo = 0;
}
}
if (UnusedValNo) {
// Delete the last unused val#.
valnos.pop_back();
}
}
void LiveInterval::MergeInClobberRange(LiveIntervals &li_,
SlotIndex Start,
SlotIndex End,
VNInfo::Allocator &VNInfoAllocator) {
// Find a value # to use for the clobber ranges. If there is already a value#
// for unknown values, use it.
VNInfo *ClobberValNo =
getNextValue(li_.getInvalidIndex(), 0, false, VNInfoAllocator);
iterator IP = begin();
IP = std::upper_bound(IP, end(), Start);
// If the start of this range overlaps with an existing liverange, trim it.
if (IP != begin() && IP[-1].end > Start) {
Start = IP[-1].end;
// Trimmed away the whole range?
if (Start >= End) return;
}
// If the end of this range overlaps with an existing liverange, trim it.
if (IP != end() && End > IP->start) {
End = IP->start;
// If this trimmed away the whole range, ignore it.
if (Start == End) return;
}
// Insert the clobber interval.
addRangeFrom(LiveRange(Start, End, ClobberValNo), IP);
}
/// MergeValueNumberInto - This method is called when two value nubmers
/// are found to be equivalent. This eliminates V1, replacing all