Added register reassignment prototype to RAGreedy. It's a simple
heuristic to reshuffle register assignments when we can't find an
available reg.
llvm-svn: 121388
diff --git a/llvm/lib/CodeGen/RegAllocBase.h b/llvm/lib/CodeGen/RegAllocBase.h
index 65bec06..71c3faf 100644
--- a/llvm/lib/CodeGen/RegAllocBase.h
+++ b/llvm/lib/CodeGen/RegAllocBase.h
@@ -58,8 +58,8 @@
/// be extended to add interesting heuristics.
///
/// Register allocators must override the selectOrSplit() method to implement
-/// live range splitting. LessSpillWeightPriority is provided as a standard
-/// comparator, but we may add an interface to override it if necessary.
+/// live range splitting. They may also override getPriority() which otherwise
+/// defaults to the spill weight computed by CalculateSpillWeights.
class RegAllocBase {
LiveIntervalUnion::Allocator UnionAllocator;
protected: