Add support for building a ScheduleDAG from MachineInstrs. This is currently

fairly conservative; it doesn't do alias-analysis queries and it doesn't
attempt to break anti-dependencies.

llvm-svn: 59324

1 files changed, 5 insertions, 0 deletions

diff --git a/llvm/include/llvm/CodeGen/ScheduleDAG.h b/llvm/include/llvm/CodeGen/ScheduleDAG.h
index 8445432e8eb..7c32205163a 100644
--- a/llvm/include/llvm/CodeGen/ScheduleDAG.h
+++ b/llvm/include/llvm/CodeGen/ScheduleDAG.h
@@ -439,6 +439,11 @@ namespace llvm {
     /// and if it has live ins that need to be copied into vregs, emit the
     /// copies into the top of the block.
     void EmitLiveInCopies(MachineBasicBlock *MBB);
+
+    /// BuildSchedUnitsFromMBB - Build SUnits from the MachineBasicBlock.
+    /// This SUnit graph is similar to the pre-regalloc SUnit graph, but represents
+    /// MachineInstrs directly instead of SDNodes.
+    void BuildSchedUnitsFromMBB();
   };
 
   /// createBURRListDAGScheduler - This creates a bottom up register usage