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LiveIntervalUnion: Allow specification of liverange when unifying/extracting.

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This allows it to add subregister ranges into the union.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@223890 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Matthias Braun 2014-12-10 01:12:59 +00:00
parent 84cc6ec889
commit 7b54b4de26
2 changed files with 17 additions and 11 deletions
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10
include/llvm/CodeGen/LiveIntervalUnion.h
View File

@ -84,10 +84,16 @@ public:
bool changedSince(unsigned tag) const { return tag != Tag; }
// Add a live virtual register to this union and merge its segments.
void unify(LiveInterval &VirtReg);
void unify(LiveInterval &VirtReg, const LiveRange &Range);
void unify(LiveInterval &VirtReg) {
unify(VirtReg, VirtReg);
}
// Remove a live virtual register's segments from this union.
void extract(LiveInterval &VirtReg);
void extract(LiveInterval &VirtReg, const LiveRange &Range);
void extract(LiveInterval &VirtReg) {
extract(VirtReg, VirtReg);
}
// Remove all inserted virtual registers.
void clear() { Segments.clear(); ++Tag; }

18
lib/CodeGen/LiveIntervalUnion.cpp
View File

@ -26,14 +26,14 @@ using namespace llvm;
// Merge a LiveInterval's segments. Guarantee no overlaps.
void LiveIntervalUnion::unify(LiveInterval &VirtReg) {
if (VirtReg.empty())
void LiveIntervalUnion::unify(LiveInterval &VirtReg, const LiveRange &Range) {
if (Range.empty())
return;
++Tag;
// Insert each of the virtual register's live segments into the map.
LiveInterval::iterator RegPos = VirtReg.begin();
LiveInterval::iterator RegEnd = VirtReg.end();
LiveRange::const_iterator RegPos = Range.begin();
LiveRange::const_iterator RegEnd = Range.end();
SegmentIter SegPos = Segments.find(RegPos->start);
while (SegPos.valid()) {
@ -53,14 +53,14 @@ void LiveIntervalUnion::unify(LiveInterval &VirtReg) {
}
// Remove a live virtual register's segments from this union.
void LiveIntervalUnion::extract(LiveInterval &VirtReg) {
if (VirtReg.empty())
void LiveIntervalUnion::extract(LiveInterval &VirtReg, const LiveRange &Range) {
if (Range.empty())
return;
++Tag;
// Remove each of the virtual register's live segments from the map.
LiveInterval::iterator RegPos = VirtReg.begin();
LiveInterval::iterator RegEnd = VirtReg.end();
LiveRange::const_iterator RegPos = Range.begin();
LiveRange::const_iterator RegEnd = Range.end();
SegmentIter SegPos = Segments.find(RegPos->start);
for (;;) {
@ -70,7 +70,7 @@ void LiveIntervalUnion::extract(LiveInterval &VirtReg) {
return;
// Skip all segments that may have been coalesced.
RegPos = VirtReg.advanceTo(RegPos, SegPos.start());
RegPos = Range.advanceTo(RegPos, SegPos.start());
if (RegPos == RegEnd)
return;