[RegisterBankInfo] Add a size argument for the cost of copy.

The cost of a copy may be different based on how many bits we have to
copy around. E.g., a 8-bit copy may be different than a 32-bit copy.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@272084 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 7 insertions, 3 deletions

diff --git a/lib/Target/AArch64/AArch64RegisterBankInfo.h b/lib/Target/AArch64/AArch64RegisterBankInfo.h
index 156f9a0b7d5..69a21ec82cf 100644
--- a/lib/Target/AArch64/AArch64RegisterBankInfo.h
+++ b/lib/Target/AArch64/AArch64RegisterBankInfo.h
@@ -34,9 +34,13 @@ class AArch64RegisterBankInfo : public RegisterBankInfo {
 public:
   AArch64RegisterBankInfo(const TargetRegisterInfo &TRI);
   /// Get the cost of a copy from \p B to \p A, or put differently,
-  /// get the cost of A = COPY B.
-  unsigned copyCost(const RegisterBank &A,
-                    const RegisterBank &B) const override;
+  /// get the cost of A = COPY B. Since register banks may cover
+  /// different size, \p Size specifies what will be the size in bits
+  /// that will be copied around.
+  ///
+  /// \note Since this is a copy, both registers have the same size.
+  unsigned copyCost(const RegisterBank &A, const RegisterBank &B,
+                    unsigned Size) const override;
 
   /// Get a register bank that covers \p RC.
   ///