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| author | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2011-07-23 03:10:17 +0000 |
|---|---|---|
| committer | Jakob Stoklund Olesen <stoklund@2pi.dk> | 2011-07-23 03:10:17 +0000 |
| commit | c7931fd725b390142f9112952b1426560000e6b4 (patch) | |
| tree | e288ae68858be1bd495473da76a1c09ca32b301a | |
| parent | 59a4f9af0a2e94ec04840a066251eca34bf3e3f8 (diff) | |
| download | llvm-c7931fd725b390142f9112952b1426560000e6b4.tar.gz llvm-c7931fd725b390142f9112952b1426560000e6b4.tar.bz2 llvm-c7931fd725b390142f9112952b1426560000e6b4.tar.xz | |
Allow null interference cursors to be queried.
They always report 'no interference'.
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@135843 91177308-0d34-0410-b5e6-96231b3b80d8
| -rw-r--r-- | lib/CodeGen/InterferenceCache.cpp | 5 | ||||
| -rw-r--r-- | lib/CodeGen/InterferenceCache.h | 3 |
2 files changed, 6 insertions, 2 deletions
diff --git a/lib/CodeGen/InterferenceCache.cpp b/lib/CodeGen/InterferenceCache.cpp index a09bb39f83..29b47bd67e 100644 --- a/lib/CodeGen/InterferenceCache.cpp +++ b/lib/CodeGen/InterferenceCache.cpp @@ -18,10 +18,13 @@ using namespace llvm; +// Static member used for null interference cursors. +InterferenceCache::BlockInterference InterferenceCache::Cursor::NoInterference; + void InterferenceCache::init(MachineFunction *mf, LiveIntervalUnion *liuarray, SlotIndexes *indexes, - const TargetRegisterInfo *tri) { + const TargetRegisterInfo *tri) { MF = mf; LIUArray = liuarray; TRI = tri; diff --git a/lib/CodeGen/InterferenceCache.h b/lib/CodeGen/InterferenceCache.h index 7f0a27a41b..4df0a9e5c3 100644 --- a/lib/CodeGen/InterferenceCache.h +++ b/lib/CodeGen/InterferenceCache.h @@ -138,6 +138,7 @@ public: class Cursor { Entry *CacheEntry; BlockInterference *Current; + static BlockInterference NoInterference; void setEntry(Entry *E) { Current = 0; @@ -175,7 +176,7 @@ public: /// moveTo - Move cursor to basic block MBBNum. void moveToBlock(unsigned MBBNum) { - Current = CacheEntry->get(MBBNum); + Current = CacheEntry ? CacheEntry->get(MBBNum) : &NoInterference; } /// hasInterference - Return true if the current block has any interference. |