[m88k] Add some functions to M88kISelLowering

These functions are used by CodeGenPrepare and/or
IRTranslator and CombineHelper, so given a good answer
may help.

2 files changed, 33 insertions, 0 deletions

diff --git a/llvm/lib/Target/M88k/M88kISelLowering.cpp b/llvm/lib/Target/M88k/M88kISelLowering.cpp
index 5025c19..9df0cc7 100644
--- a/llvm/lib/Target/M88k/M88kISelLowering.cpp
+++ b/llvm/lib/Target/M88k/M88kISelLowering.cpp
@@ -33,10 +33,38 @@ M88kTargetLowering::M88kTargetLowering(const TargetMachine &TM,
   // How we extend i1 boolean values.
   setBooleanContents(ZeroOrOneBooleanContent);
 
+  // Architecture has bit extract instruction.
+  setHasExtractBitsInsn();
+
   setMinFunctionAlignment(Align(4));
   setPrefFunctionAlignment(Align(4));
 }
 
+bool M88kTargetLowering::isSelectSupported(SelectSupportKind /*kind*/) const {
+  // No kind of select is supported.
+  return false;
+}
+
+bool M88kTargetLowering::isIndexingLegal(MachineInstr &MI, Register Base,
+                                         Register Offset, bool IsPre,
+                                         MachineRegisterInfo &MRI) const {
+  // Combination 32bit Base+Offset is supported, but preincrement not.
+  return !IsPre && MRI.getType(Base).getScalarSizeInBits() == 32 &&
+         MRI.getType(Offset).getScalarSizeInBits() == 32;
+}
+
+#define GET_REGISTER_MATCHER
+#include "M88kGenAsmMatcher.inc"
+
+Register
+M88kTargetLowering::getRegisterByName(const char *RegName, LLT Ty,
+                                      const MachineFunction &MF) const {
+  if (Register Reg = MatchRegisterName(RegName))
+    return Reg;
+  report_fatal_error(
+      Twine("Invalid register name \"" + StringRef(RegName) + "\"."));
+}
+
 bool M88kTargetLowering::isConstantUnsignedBitfieldExtractLegal(unsigned Opc,
                                                                 LLT Ty1,
                                                                 LLT Ty2) const {
diff --git a/llvm/lib/Target/M88k/M88kISelLowering.h b/llvm/lib/Target/M88k/M88kISelLowering.h
index 213e690..f8235ef 100644
--- a/llvm/lib/Target/M88k/M88kISelLowering.h
+++ b/llvm/lib/Target/M88k/M88kISelLowering.h
@@ -59,6 +59,11 @@ public:
   explicit M88kTargetLowering(const TargetMachine &TM,
                               const M88kSubtarget &STI);
 
+  bool isSelectSupported(SelectSupportKind /*kind*/) const override;
+  bool isIndexingLegal(MachineInstr &MI, Register Base, Register Offset,
+                       bool IsPre, MachineRegisterInfo &MRI) const override;
+  Register getRegisterByName(const char *RegName, LLT Ty,
+                             const MachineFunction &MF) const override;
   bool isConstantUnsignedBitfieldExtractLegal(unsigned Opc, LLT Ty1,
                                               LLT Ty2) const override;
 };