diff options
| author | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2011-04-26 22:33:12 +0000 |
|---|---|---|
| committer | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2011-04-26 22:33:12 +0000 |
| commit | 9f4b893b84d9c2b56aa2abc3c96ce1e5ccc465e5 (patch) | |
| tree | c5bf2921106ae502b478c1373c07131d93d855c1 /lib/CodeGen/SplitKit.h | |
| parent | d5c7f7cb5e15a7382cd163cb191db898510226c8 (diff) | |
| download | llvm-9f4b893b84d9c2b56aa2abc3c96ce1e5ccc465e5.tar.gz llvm-9f4b893b84d9c2b56aa2abc3c96ce1e5ccc465e5.tar.bz2 llvm-9f4b893b84d9c2b56aa2abc3c96ce1e5ccc465e5.tar.xz | |
Add a safe-guard against repeated splitting for some rare cases.
The number of blocks covered by a live range must be strictly decreasing when
splitting, otherwise we can't allow repeated splitting.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@130249 91177308-0d34-0410-b5e6-96231b3b80d8
Diffstat (limited to 'lib/CodeGen/SplitKit.h')
| -rw-r--r-- | lib/CodeGen/SplitKit.h | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/lib/CodeGen/SplitKit.h b/lib/CodeGen/SplitKit.h index cccaace6f9..2ae760a58d 100644 --- a/lib/CodeGen/SplitKit.h +++ b/lib/CodeGen/SplitKit.h @@ -150,6 +150,11 @@ public: /// getThroughBlocks - Return the set of through blocks. const BitVector &getThroughBlocks() const { return ThroughBlocks; } + /// countLiveBlocks - Return the number of blocks where li is live. + /// This is guaranteed to return the same number as getNumThroughBlocks() + + /// getUseBlocks().size() after calling analyze(li). + unsigned countLiveBlocks(const LiveInterval *li) const; + typedef SmallPtrSet<const MachineBasicBlock*, 16> BlockPtrSet; /// getMultiUseBlocks - Add basic blocks to Blocks that may benefit from |