+ return std::make_pair(false, nullptr);
+}
+
+bool MipsSEDAGToDAGISel::
+SelectInlineAsmMemoryOperand(const SDValue &Op, unsigned ConstraintID,
+ std::vector<SDValue> &OutOps) {
+ SDValue Base, Offset;
+
+ switch(ConstraintID) {
+ default:
+ llvm_unreachable("Unexpected asm memory constraint");
+ // All memory constraints can at least accept raw pointers.
+ case InlineAsm::Constraint_i:
+ OutOps.push_back(Op);
+ OutOps.push_back(CurDAG->getTargetConstant(0, SDLoc(Op), MVT::i32));
+ return false;
+ case InlineAsm::Constraint_m:
+ if (selectAddrRegImm16(Op, Base, Offset)) {
+ OutOps.push_back(Base);
+ OutOps.push_back(Offset);
+ return false;
+ }
+ OutOps.push_back(Op);
+ OutOps.push_back(CurDAG->getTargetConstant(0, SDLoc(Op), MVT::i32));
+ return false;
+ case InlineAsm::Constraint_R:
+ // The 'R' constraint is supposed to be much more complicated than this.
+ // However, it's becoming less useful due to architectural changes and
+ // ought to be replaced by other constraints such as 'ZC'.
+ // For now, support 9-bit signed offsets which is supportable by all
+ // subtargets for all instructions.
+ if (selectAddrRegImm9(Op, Base, Offset)) {
+ OutOps.push_back(Base);
+ OutOps.push_back(Offset);
+ return false;
+ }
+ OutOps.push_back(Op);
+ OutOps.push_back(CurDAG->getTargetConstant(0, SDLoc(Op), MVT::i32));
+ return false;
+ case InlineAsm::Constraint_ZC:
+ // ZC matches whatever the pref, ll, and sc instructions can handle for the
+ // given subtarget.
+ if (Subtarget->inMicroMipsMode()) {
+ // On microMIPS, they can handle 12-bit offsets.
+ if (selectAddrRegImm12(Op, Base, Offset)) {
+ OutOps.push_back(Base);
+ OutOps.push_back(Offset);
+ return false;
+ }
+ } else if (Subtarget->hasMips32r6()) {
+ // On MIPS32r6/MIPS64r6, they can only handle 9-bit offsets.
+ if (selectAddrRegImm9(Op, Base, Offset)) {
+ OutOps.push_back(Base);
+ OutOps.push_back(Offset);
+ return false;
+ }
+ } else if (selectAddrRegImm16(Op, Base, Offset)) {
+ // Prior to MIPS32r6/MIPS64r6, they can handle 16-bit offsets.
+ OutOps.push_back(Base);
+ OutOps.push_back(Offset);
+ return false;
+ }
+ // In all cases, 0-bit offsets are acceptable.
+ OutOps.push_back(Op);
+ OutOps.push_back(CurDAG->getTargetConstant(0, SDLoc(Op), MVT::i32));
+ return false;
+ }
+ return true;