Allow null interference cursors to be queried.
They always report 'no interference'.
llvm-svn: 135843
diff --git a/llvm/lib/CodeGen/InterferenceCache.h b/llvm/lib/CodeGen/InterferenceCache.h
index 7f0a27a..4df0a9e 100644
--- a/llvm/lib/CodeGen/InterferenceCache.h
+++ b/llvm/lib/CodeGen/InterferenceCache.h
@@ -138,6 +138,7 @@
class Cursor {
Entry *CacheEntry;
BlockInterference *Current;
+ static BlockInterference NoInterference;
void setEntry(Entry *E) {
Current = 0;
@@ -175,7 +176,7 @@
/// 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.