//===----------------------------------------------------------------------===//
#include "M68kRegisterBankInfo.h"
-#include "MCTargetDesc/M68kMCTargetDesc.h"
+#include "M68kInstrInfo.h" // For the register classes
+#include "M68kSubtarget.h"
#include "llvm/CodeGen/GlobalISel/RegisterBank.h"
#include "llvm/CodeGen/GlobalISel/RegisterBankInfo.h"
#include "llvm/CodeGen/MachineRegisterInfo.h"
#define GET_TARGET_REGBANK_IMPL
#include "M68kGenRegisterBank.inc"
-#undef GET_TARGET_REGBANK_IMPL
using namespace llvm;
+// FIXME: TableGen this.
+// If it grows too much and TableGen still isn't ready to do the job, extract it
+// into an M68kGenRegisterBankInfo.def (similar to AArch64).
+namespace llvm {
+namespace M68k {
+enum PartialMappingIdx {
+ PMI_GPR,
+ PMI_Min = PMI_GPR,
+};
+
+RegisterBankInfo::PartialMapping PartMappings[]{
+ // GPR Partial Mapping
+ {0, 32, GPRRegBank},
+};
+
+enum ValueMappingIdx {
+ InvalidIdx = 0,
+ GPR3OpsIdx = 1,
+};
+
+RegisterBankInfo::ValueMapping ValueMappings[] = {
+ // invalid
+ {nullptr, 0},
+ // 3 operands in GPRs
+ {&PartMappings[PMI_GPR - PMI_Min], 1},
+ {&PartMappings[PMI_GPR - PMI_Min], 1},
+ {&PartMappings[PMI_GPR - PMI_Min], 1},
+
+};
+} // end namespace M68k
+} // end namespace llvm
+
M68kRegisterBankInfo::M68kRegisterBankInfo(const TargetRegisterInfo &TRI)
: M68kGenRegisterBankInfo() {}
+
+const RegisterBank &
+M68kRegisterBankInfo::getRegBankFromRegClass(const TargetRegisterClass &RC,
+ LLT) const {
+ return getRegBank(M68k::GPRRegBankID);
+}
+
+const RegisterBankInfo::InstructionMapping &
+M68kRegisterBankInfo::getInstrMapping(const MachineInstr &MI) const {
+ auto Opc = MI.getOpcode();
+
+ if (!isPreISelGenericOpcode(Opc)) {
+ const InstructionMapping &Mapping = getInstrMappingImpl(MI);
+ if (Mapping.isValid())
+ return Mapping;
+ }
+
+ using namespace TargetOpcode;
+
+ unsigned NumOperands = MI.getNumOperands();
+ const ValueMapping *OperandsMapping = &M68k::ValueMappings[M68k::GPR3OpsIdx];
+
+ switch (Opc) {
+ case G_ADD:
+ case G_SUB:
+ case G_MUL:
+ case G_SDIV:
+ case G_UDIV:
+ case G_LOAD:
+ case G_STORE: {
+ OperandsMapping = &M68k::ValueMappings[M68k::GPR3OpsIdx];
+ break;
+ }
+
+ case G_CONSTANT:
+ case G_FRAME_INDEX:
+ OperandsMapping =
+ getOperandsMapping({&M68k::ValueMappings[M68k::GPR3OpsIdx], nullptr});
+ break;
+ default:
+ return getInvalidInstructionMapping();
+ }
+
+ return getInstructionMapping(DefaultMappingID, /*Cost=*/1, OperandsMapping,
+ NumOperands);
+}
--- /dev/null
+; RUN: llc -mtriple=m68k -global-isel -stop-after=regbankselect < %s | FileCheck %s
+
+define i32 @test_add(i32 %x, i32 %y) {
+ ; CHECK-LABEL: name: test_add
+ ; CHECK: bb.1 (%ir-block.0):
+ ; CHECK: [[G_F_I1:%[0-9]+]]:anygpr(p0) = G_FRAME_INDEX
+ ; CHECK: [[G_LOAD1:%[0-9]+]]:anygpr(s32) = G_LOAD [[G_F_I1]](p0)
+ ; CHECK: [[G_F_I2:%[0-9]+]]:anygpr(p0) = G_FRAME_INDEX
+ ; CHECK: [[G_LOAD2:%[0-9]+]]:anygpr(s32) = G_LOAD [[G_F_I2]](p0)
+ ; CHECK: [[G_ADD1:%[0-9]+]]:anygpr(s32) = G_ADD [[G_LOAD1]], [[G_LOAD2]]
+ ; CHECK: $d0 = COPY [[G_ADD1]](s32)
+ ; CHECK: RTS implicit $d0
+ %sum = add i32 %x, %y
+ ret i32 %sum
+}
+
+define i32 @test_sub(i32 %x, i32 %y) {
+ ; CHECK-LABEL: name: test_sub
+ ; CHECK: bb.1 (%ir-block.0):
+ ; CHECK: [[G_F_I1:%[0-9]+]]:anygpr(p0) = G_FRAME_INDEX
+ ; CHECK: [[G_LOAD1:%[0-9]+]]:anygpr(s32) = G_LOAD [[G_F_I1]](p0)
+ ; CHECK: [[G_F_I2:%[0-9]+]]:anygpr(p0) = G_FRAME_INDEX
+ ; CHECK: [[G_LOAD2:%[0-9]+]]:anygpr(s32) = G_LOAD [[G_F_I2]](p0)
+ ; CHECK: [[G_SUB1:%[0-9]+]]:anygpr(s32) = G_SUB [[G_LOAD1]], [[G_LOAD2]]
+ ; CHECK: $d0 = COPY [[G_SUB1]](s32)
+ ; CHECK: RTS implicit $d0
+ %diff = sub i32 %x, %y
+ ret i32 %diff
+}