[globalisel][arm] Tablegen-erate current Register Bank Information.

Summary:
This patch tablegen-erates the ARM register bank information so that the
static tables added in D27807 no longer need to be maintained.

Depends on D27338

Reviewers: t.p.northover, rovka, ab, qcolombet, aditya_nandakumar

Reviewed By: rovka

Subscribers: aemerson, rengolin, mgorny, dberris, kristof.beyls, llvm-commits

Differential Revision: https://reviews.llvm.org/D28567

llvm-svn: 294124

llvm/lib/Target/ARM/ARM.td

@@ -848,6 +848,8 @@ def : ProcessorModel<"cortex-r52", CortexR52Model,      [ARMv8r, ProcR52,
 
 include "ARMRegisterInfo.td"
 
+include "ARMRegisterBanks.td"
+
 include "ARMCallingConv.td"
 
 //===----------------------------------------------------------------------===//

llvm/lib/Target/ARM/ARMRegisterBankInfo.cpp

@@ -18,6 +18,9 @@
 #include "llvm/CodeGen/MachineRegisterInfo.h"
 #include "llvm/Target/TargetRegisterInfo.h"
 
+#define GET_TARGET_REGBANK_IMPL
+#include "ARMGenRegisterBank.inc"
+
 using namespace llvm;
 
 #ifndef LLVM_BUILD_GLOBAL_ISEL
@@ -29,37 +32,6 @@ using namespace llvm;
 // into an ARMGenRegisterBankInfo.def (similar to AArch64).
 namespace llvm {
 namespace ARM {
-const uint32_t GPRCoverageData[] = {
-    // Classes 0-31
-    (1u << ARM::GPRRegClassID) | (1u << ARM::GPRwithAPSRRegClassID) |
-        (1u << ARM::GPRnopcRegClassID) | (1u << ARM::rGPRRegClassID) |
-        (1u << ARM::hGPRRegClassID) | (1u << ARM::tGPRRegClassID) |
-        (1u << ARM::GPRnopc_and_hGPRRegClassID) |
-        (1u << ARM::hGPR_and_rGPRRegClassID) | (1u << ARM::tcGPRRegClassID) |
-        (1u << ARM::tGPR_and_tcGPRRegClassID) | (1u << ARM::GPRspRegClassID) |
-        (1u << ARM::hGPR_and_tcGPRRegClassID),
-    // Classes 32-63
-    0,
-    // Classes 64-96
-    0,
-    // FIXME: Some of the entries below this point can be safely removed once
-    // this is tablegenerated. It's only needed because of the hardcoded
-    // register class limit.
-    // Classes 97-128
-    0,
-    // Classes 129-160
-    0,
-    // Classes 161-192
-    0,
-    // Classes 193-224
-    0,
-};
-
-// FIXME: The 200 will be replaced by the number of register classes when this is
-//        tablegenerated.
-RegisterBank GPRRegBank(ARM::GPRRegBankID, "GPRB", 32, ARM::GPRCoverageData, 200);
-RegisterBank *RegBanks[] = {&GPRRegBank};
-
 RegisterBankInfo::PartialMapping GPRPartialMapping{0, 32, GPRRegBank};
 
 RegisterBankInfo::ValueMapping ValueMappings[] = {
@@ -68,7 +40,7 @@ RegisterBankInfo::ValueMapping ValueMappings[] = {
 } // end namespace llvm
 
 ARMRegisterBankInfo::ARMRegisterBankInfo(const TargetRegisterInfo &TRI)
-    : RegisterBankInfo(ARM::RegBanks, ARM::NumRegisterBanks) {
+    : ARMGenRegisterBankInfo() {
   static bool AlreadyInit = false;
   // We have only one set of register banks, whatever the subtarget
   // is. Therefore, the initialization of the RegBanks table should be

llvm/lib/Target/ARM/ARMRegisterBankInfo.h

@@ -16,19 +16,20 @@
 
 #include "llvm/CodeGen/GlobalISel/RegisterBankInfo.h"
 
+#define GET_REGBANK_DECLARATIONS
+#include "ARMGenRegisterBank.inc"
+
 namespace llvm {
 
 class TargetRegisterInfo;
 
-namespace ARM {
+class ARMGenRegisterBankInfo : public RegisterBankInfo {
-enum {
+#define GET_TARGET_REGBANK_CLASS
-  GPRRegBankID = 0, // General purpose registers
+#include "ARMGenRegisterBank.inc"
-  NumRegisterBanks,
 };
-} // end namespace ARM
 
 /// This class provides the information for the target register banks.
-class ARMRegisterBankInfo final : public RegisterBankInfo {
+class ARMRegisterBankInfo final : public ARMGenRegisterBankInfo {
 public:
   ARMRegisterBankInfo(const TargetRegisterInfo &TRI);
 

llvm/lib/Target/ARM/ARMRegisterBanks.td

@@ -0,0 +1,13 @@
+//=- ARMRegisterBank.td - Describe the AArch64 Banks ---------*- tablegen -*-=//
+//
+//                     The LLVM Compiler Infrastructure
+//
+// This file is distributed under the University of Illinois Open Source
+// License. See LICENSE.TXT for details.
+//
+//===----------------------------------------------------------------------===//
+//
+//
+//===----------------------------------------------------------------------===//
+
+def GPRRegBank : RegisterBank<"GPRB", [GPR, GPRwithAPSR]>;

llvm/lib/Target/ARM/CMakeLists.txt

@@ -1,5 +1,6 @@
 set(LLVM_TARGET_DEFINITIONS ARM.td)
 
+tablegen(LLVM ARMGenRegisterBank.inc -gen-register-bank)
 tablegen(LLVM ARMGenRegisterInfo.inc -gen-register-info)
 tablegen(LLVM ARMGenInstrInfo.inc -gen-instr-info)
 tablegen(LLVM ARMGenMCCodeEmitter.inc -gen-emitter)