maxjhandsome
/
llvm-project
forked from OSchip/llvm-project
1
0
Fork 0
Code Issues Pull Requests Packages Releases Wiki Activity

Reuse unused val#'s to avoid running out of memory in extreme cases. 

llvm-svn: 70069
This commit is contained in:
Evan Cheng 2009-04-25 20:20:15 +00:00
parent 24061b532d
commit 80ad2e6b42
1 changed files with 5 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
llvm/lib/CodeGen/LiveInterval.cpp
View File

@ -577,6 +577,7 @@ void LiveInterval::MergeInClobberRanges(const LiveInterval &Clobbers,
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#.
@ -584,8 +585,10 @@ void LiveInterval::MergeInClobberRanges(const LiveInterval &Clobbers,
DenseMap<VNInfo*, VNInfo*>::iterator VI = ValNoMaps.find(I->valno);
if (VI != ValNoMaps.end())
ClobberValNo = VI->second;
else if (UnusedValNo)
ClobberValNo = UnusedValNo;
else {
ClobberValNo = getNextValue(~0U, 0, VNInfoAllocator);
UnusedValNo = ClobberValNo = getNextValue(~0U, 0, VNInfoAllocator);
ValNoMaps.insert(std::make_pair(I->valno, ClobberValNo));
}
@ -623,6 +626,7 @@ void LiveInterval::MergeInClobberRanges(const LiveInterval &Clobbers,
// Insert the clobber interval.
IP = addRangeFrom(LiveRange(SubRangeStart, SubRangeEnd, ClobberValNo),
IP);
UnusedValNo = 0;
}
}
}