1 //=- LoongArchISelDAGToDAG.h - A dag to dag inst selector for LoongArch ---===//
2 //
3 // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
4 // See https://llvm.org/LICENSE.txt for license information.
5 // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
6 //
7 //===----------------------------------------------------------------------===//
8 //
9 // This file defines an instruction selector for the LoongArch target.
10 //
11 //===----------------------------------------------------------------------===//
12 
13 #ifndef LLVM_LIB_TARGET_LOONGARCH_LOONGARCHISELDAGTODAG_H
14 #define LLVM_LIB_TARGET_LOONGARCH_LOONGARCHISELDAGTODAG_H
15 
16 #include "LoongArch.h"
17 #include "LoongArchTargetMachine.h"
18 #include "llvm/CodeGen/SelectionDAGISel.h"
19 
20 // LoongArch-specific code to select LoongArch machine instructions for
21 // SelectionDAG operations.
22 namespace llvm {
23 class LoongArchDAGToDAGISel : public SelectionDAGISel {
24   const LoongArchSubtarget *Subtarget = nullptr;
25 
26 public:
27   static char ID;
28 
29   LoongArchDAGToDAGISel() = delete;
30 
31   explicit LoongArchDAGToDAGISel(LoongArchTargetMachine &TM)
32       : SelectionDAGISel(ID, TM) {}
33 
34   bool runOnMachineFunction(MachineFunction &MF) override {
35     Subtarget = &MF.getSubtarget<LoongArchSubtarget>();
36     return SelectionDAGISel::runOnMachineFunction(MF);
37   }
38 
39   void Select(SDNode *Node) override;
40 
41   bool SelectInlineAsmMemoryOperand(const SDValue &Op, unsigned ConstraintID,
42                                     std::vector<SDValue> &OutOps) override;
43 
44   bool SelectBaseAddr(SDValue Addr, SDValue &Base);
45   bool SelectAddrConstant(SDValue Addr, SDValue &Base, SDValue &Offset);
46   bool selectNonFIBaseAddr(SDValue Addr, SDValue &Base);
47 
48   bool selectShiftMask(SDValue N, unsigned ShiftWidth, SDValue &ShAmt);
49   bool selectShiftMaskGRLen(SDValue N, SDValue &ShAmt) {
50     return selectShiftMask(N, Subtarget->getGRLen(), ShAmt);
51   }
52   bool selectShiftMask32(SDValue N, SDValue &ShAmt) {
53     return selectShiftMask(N, 32, ShAmt);
54   }
55 
56   bool selectSExti32(SDValue N, SDValue &Val);
57   bool selectZExti32(SDValue N, SDValue &Val);
58 
59 // Include the pieces autogenerated from the target description.
60 #include "LoongArchGenDAGISel.inc"
61 };
62 
63 } // end namespace llvm
64 
65 #endif // LLVM_LIB_TARGET_LOONGARCH_LOONGARCHISELDAGTODAG_H
66