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Don't allocate memory in LiveInterval::join().

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Rewrite value numbers directly in the 'Other' LiveInterval which is
moribund anyway. This avoids allocating the OtherAssignments vector.

llvm-svn: 175690
This commit is contained in:
Jakob Stoklund Olesen 2013-02-20 23:51:10 +00:00
parent 1dd085ac91
commit 6ea4070b94
1 changed files with 7 additions and 10 deletions
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17
lib/CodeGen/LiveInterval.cpp
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@ -464,10 +464,12 @@ void LiveInterval::join(LiveInterval &Other,
ranges.erase(OutIt, end());
}
// Remember assignements because val# ids are changing.
SmallVector<unsigned, 16> OtherAssignments;
// Rewrite Other values before changing the VNInfo ids.
// This can leave Other in an invalid state because we're not coalescing
// touching segments that now have identical values. That's OK since Other is
// not supposed to be valid after calling join();
for (iterator I = Other.begin(), E = Other.end(); I != E; ++I)
OtherAssignments.push_back(RHSValNoAssignments[I->valno->id]);
I->valno = NewVNInfo[RHSValNoAssignments[I->valno->id]];
// Update val# info. Renumber them and make sure they all belong to this
// LiveInterval now. Also remove dead val#'s.
@ -487,13 +489,8 @@ void LiveInterval::join(LiveInterval &Other,
// Okay, now insert the RHS live ranges into the LHS.
LiveRangeUpdater Updater(this);
unsigned RangeNo = 0;
for (iterator I = Other.begin(), E = Other.end(); I != E; ++I, ++RangeNo) {
// Map the valno in the other live range to the current live range.
VNInfo *VNI = NewVNInfo[OtherAssignments[RangeNo]];
assert(VNI && "Adding a dead range?");
Updater.add(I->start, I->end, VNI);
}
for (iterator I = Other.begin(), E = Other.end(); I != E; ++I)
Updater.add(*I);
}
/// MergeRangesInAsValue - Merge all of the intervals in RHS into this live