[GlobalISel] Add a class, RegisterBank, to represent register banks.

llvm-svn: 265445

2 files changed, 40 insertions, 0 deletions

diff --git a/llvm/lib/CodeGen/GlobalISel/CMakeLists.txt b/llvm/lib/CodeGen/GlobalISel/CMakeLists.txt
index bb6225f031a..162c8197e95 100644
--- a/llvm/lib/CodeGen/GlobalISel/CMakeLists.txt
+++ b/llvm/lib/CodeGen/GlobalISel/CMakeLists.txt
@@ -3,6 +3,7 @@ set(GLOBAL_ISEL_FILES
       IRTranslator.cpp
       MachineIRBuilder.cpp
       RegBankSelect.cpp
+      RegisterBank.cpp
       )
 
 # Add GlobalISel files to the dependencies if the user wants to build it.
diff --git a/llvm/lib/CodeGen/GlobalISel/RegisterBank.cpp b/llvm/lib/CodeGen/GlobalISel/RegisterBank.cpp
new file mode 100644
index 00000000000..5c86e426e1b
--- /dev/null
+++ b/llvm/lib/CodeGen/GlobalISel/RegisterBank.cpp
@@ -0,0 +1,39 @@
+//===- llvm/CodeGen/GlobalISel/RegisterBank.cpp - Register Bank --*- C++ -*-==//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+/// \file
+/// This file implements the RegisterBank class.
+//===----------------------------------------------------------------------===//
+
+#include "llvm/CodeGen/GlobalISel/RegisterBank.h"
+
+#include "llvm/Target/TargetRegisterInfo.h"
+
+#define DEBUG_TYPE "registerbank"
+
+using namespace llvm;
+
+void RegisterBank::verify(const TargetRegisterInfo &TRI) const {
+  // Verify that the Size of the register bank is big enough to cover all the
+  // register classes it covers.
+  // Verify that the register bank covers all the sub and super classes of the
+  // classes it covers.
+}
+
+bool RegisterBank::contains(const TargetRegisterClass &RC) const {
+  return ContainedRegClass.test(RC.getID());
+}
+
+bool RegisterBank::operator==(const RegisterBank &OtherRB) const {
+  // There must be only one instance of a given register bank alive
+  // for the whole compilation.
+  // The RegisterBankInfo is supposed to enforce that.
+  assert((OtherRB.getID() != getID() || &OtherRB == this) &&
+         "ID does not uniquely identify a RegisterBank");
+  return &OtherRB == this;
+}