Break anti-dependencies using free registers in a round-robin manner to avoid introducing new anti-dependencies.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@86098 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 4 insertions, 0 deletions

diff --git a/lib/CodeGen/AggressiveAntiDepBreaker.h b/lib/CodeGen/AggressiveAntiDepBreaker.h
index 5d9b40b00c..c5121682bd 100644
--- a/lib/CodeGen/AggressiveAntiDepBreaker.h
+++ b/lib/CodeGen/AggressiveAntiDepBreaker.h
@@ -155,6 +155,9 @@ namespace llvm {
     void FinishBlock();
 
   private:
+    typedef std::map<const TargetRegisterClass *,
+                     TargetRegisterClass::const_iterator> RenameOrderType;
+
     /// IsImplicitDefUse - Return true if MO represents a register
     /// that is both implicitly used and defined in MI
     bool IsImplicitDefUse(MachineInstr *MI, MachineOperand& MO);
@@ -169,6 +172,7 @@ namespace llvm {
     void ScanInstruction(MachineInstr *MI, unsigned Count);
     BitVector GetRenameRegisters(unsigned Reg);
     bool FindSuitableFreeRegisters(unsigned AntiDepGroupIndex,
+                                   RenameOrderType& RenameOrder,
                                    std::map<unsigned, unsigned> &RenameMap);
   };
 }