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Simplifications to liveinterval analysis, no functionality change.

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@29896 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner
2006-08-26 01:28:16 +00:00
parent 6da2f3268d
commit e7f729b42b
2 changed files with 36 additions and 37 deletions
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26
lib/CodeGen/LiveInterval.cpp
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@ -374,21 +374,25 @@ LiveInterval::FindLiveRangeContaining(unsigned Idx) {
/// is the result of a copy instruction in the source program, that occurs at
/// index 'CopyIdx' that copies from 'Other' to 'this'.
void LiveInterval::join(LiveInterval &Other, unsigned CopyIdx) {
const LiveRange *SourceLR = Other.getLiveRangeContaining(CopyIdx-1);
const LiveRange *DestLR = getLiveRangeContaining(CopyIdx);
assert(SourceLR && DestLR && "Not joining due to a copy?");
unsigned MergedSrcValIdx = SourceLR->ValId;
unsigned MergedDstValIdx = DestLR->ValId;
// Try to do the least amount of work possible. In particular, if there are
// more liverange chunks in the other set than there are in the 'this' set,
// swap sets to merge the fewest chunks in possible.
if (Other.ranges.size() > ranges.size()) {
std::swap(MergedSrcValIdx, MergedDstValIdx);
std::swap(ranges, Other.ranges);
std::swap(NumValues, Other.NumValues);
std::swap(InstDefiningValue, Other.InstDefiningValue);
//
// Also, if one range is a physreg and one is a vreg, we always merge from the
// vreg into the physreg, which leaves the vreg intervals pristine.
unsigned OtherOffs = 1, ThisOffs = 0;
if ((Other.ranges.size() > ranges.size() &&
MRegisterInfo::isVirtualRegister(reg)) ||
MRegisterInfo::isPhysicalRegister(Other.reg)) {
swap(Other);
std::swap(ThisOffs, OtherOffs);
}
const LiveRange *SourceLR = Other.getLiveRangeContaining(CopyIdx-OtherOffs);
const LiveRange *DestLR = getLiveRangeContaining(CopyIdx-ThisOffs);
assert(SourceLR && DestLR && "Not joining due to a copy?");
unsigned MergedSrcValIdx = SourceLR->ValId;
unsigned MergedDstValIdx = DestLR->ValId;
// Join the ranges of other into the ranges of this interval.
std::map<unsigned, unsigned> Dst2SrcIdxMap;