- Mark last use of a split interval as kill instead of letting spiller track it.

  This allows an important optimization to be re-enabled.
- If all uses / defs of a split interval can be folded, give the interval a
  low spill weight so it would not be picked in case spilling is needed (avoid
  pushing other intervals in the same BB to be spilled).


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@44601 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 2 insertions, 0 deletions

diff --git a/include/llvm/CodeGen/LiveIntervalAnalysis.h b/include/llvm/CodeGen/LiveIntervalAnalysis.h
index a40d0ab..19865e5 100644
--- a/include/llvm/CodeGen/LiveIntervalAnalysis.h
+++ b/include/llvm/CodeGen/LiveIntervalAnalysis.h
@@ -278,6 +278,8 @@ namespace llvm {
                               SmallVector<unsigned, 2> &Ops,
                               bool isSS, int Slot, unsigned Reg);
 
+    /// canFoldMemoryOperand - Returns true if the specified load / store
+    /// folding is possible.
     bool canFoldMemoryOperand(MachineInstr *MI,
                               SmallVector<unsigned, 2> &Ops) const;