TargetRegisterInfo: Provide a way to check assigned registers in getRegAllocationHints()

Pass a const reference to LiveRegMatrix to getRegAllocationHints()
because some targets can prodive better hints if they can test whether a
physreg has been used for register allocation yet.

llvm-svn: 242340

1 files changed, 3 insertions, 1 deletions

diff --git a/llvm/lib/CodeGen/AllocationOrder.h b/llvm/lib/CodeGen/AllocationOrder.h
index 02b2d9250bc..2aee3a63a2b 100644
--- a/llvm/lib/CodeGen/AllocationOrder.h
+++ b/llvm/lib/CodeGen/AllocationOrder.h
@@ -24,6 +24,7 @@ namespace llvm {
 
 class RegisterClassInfo;
 class VirtRegMap;
+class LiveRegMatrix;
 
 class LLVM_LIBRARY_VISIBILITY AllocationOrder {
   SmallVector<MCPhysReg, 16> Hints;
@@ -37,7 +38,8 @@ public:
   /// @param RegClassInfo Information about reserved and allocatable registers.
   AllocationOrder(unsigned VirtReg,
                   const VirtRegMap &VRM,
-                  const RegisterClassInfo &RegClassInfo);
+                  const RegisterClassInfo &RegClassInfo,
+                  const LiveRegMatrix *Matrix);
 
   /// Get the allocation order without reordered hints.
   ArrayRef<MCPhysReg> getOrder() const { return Order; }