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| author | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2011-04-30 05:07:46 +0000 |
|---|---|---|
| committer | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2011-04-30 05:07:46 +0000 |
| commit | 66446c803a11a26e4bb39b74091d146ac850ae4c (patch) | |
| tree | 1b58844cb68fd77e37a94d852097d91c3d50aa50 | |
| parent | 4f5558e676b8c34d5094681d2797367682f96918 (diff) | |
Use hysteresis for local live range splitting as well.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130596 91177308-0d34-0410-b5e6-96231b3b80d8
| -rw-r--r-- | lib/CodeGen/RegAllocGreedy.cpp | 8 |
1 files changed, 4 insertions, 4 deletions
diff --git a/lib/CodeGen/RegAllocGreedy.cpp b/lib/CodeGen/RegAllocGreedy.cpp index d57bc88a13..7c461d8ea7 100644 --- a/lib/CodeGen/RegAllocGreedy.cpp +++ b/lib/CodeGen/RegAllocGreedy.cpp @@ -1225,13 +1225,13 @@ unsigned RAGreedy::tryLocalSplit(LiveInterval &VirtReg, AllocationOrder &Order, PrevSlot[SplitBefore].distance(Uses[SplitAfter])); // Would this split be possible to allocate? // Never allocate all gaps, we wouldn't be making progress. - float Diff = EstWeight - MaxGap; - DEBUG(dbgs() << " w=" << EstWeight << " d=" << Diff); - if (Diff > 0) { + DEBUG(dbgs() << " w=" << EstWeight); + if (EstWeight * Hysteresis >= MaxGap) { Shrink = false; + float Diff = EstWeight - MaxGap; if (Diff > BestDiff) { DEBUG(dbgs() << " (best)"); - BestDiff = Diff; + BestDiff = Hysteresis * Diff; BestBefore = SplitBefore; BestAfter = SplitAfter; } |