Refactor some code; check if commuteInstruction is able to commute the instruction.

llvm-svn: 47208

1 files changed, 5 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/SimpleRegisterCoalescing.h b/llvm/lib/CodeGen/SimpleRegisterCoalescing.h
index cae5e5a450e..309a858758a 100644
--- a/llvm/lib/CodeGen/SimpleRegisterCoalescing.h
+++ b/llvm/lib/CodeGen/SimpleRegisterCoalescing.h
@@ -178,6 +178,11 @@ namespace llvm {
     bool AdjustCopiesBackFrom(LiveInterval &IntA, LiveInterval &IntB,
                               MachineInstr *CopyMI);
 
+    /// HasOtherReachingDefs - Return true if there are definitions of IntB
+    /// other than BValNo val# that can reach uses of AValno val# of IntA.
+    bool HasOtherReachingDefs(LiveInterval &IntA, LiveInterval &IntB,
+                              VNInfo *AValNo, VNInfo *BValNo);
+
     /// RemoveCopyByCommutingDef - We found a non-trivially-coalescable copy.
     /// If the source value number is defined by a commutable instruction and
     /// its other operand is coalesced to the copy dest register, see if we