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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
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@ -18,10 +18,13 @@
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using namespace llvm;
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// Static member used for null interference cursors.
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InterferenceCache::BlockInterference InterferenceCache::Cursor::NoInterference;
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void InterferenceCache::init(MachineFunction *mf,
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LiveIntervalUnion *liuarray,
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SlotIndexes *indexes,
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const TargetRegisterInfo *tri) {
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const TargetRegisterInfo *tri) {
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MF = mf;
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LIUArray = liuarray;
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TRI = tri;
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@ -138,6 +138,7 @@ public:
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class Cursor {
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Entry *CacheEntry;
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BlockInterference *Current;
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static BlockInterference NoInterference;
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void setEntry(Entry *E) {
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Current = 0;
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@ -175,7 +176,7 @@ public:
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/// moveTo - Move cursor to basic block MBBNum.
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void moveToBlock(unsigned MBBNum) {
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Current = CacheEntry->get(MBBNum);
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Current = CacheEntry ? CacheEntry->get(MBBNum) : &NoInterference;
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}
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/// hasInterference - Return true if the current block has any interference.
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