1 //==- WebAssemblyTargetTransformInfo.h - WebAssembly-specific TTI -*- C++ -*-=//
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 /// \file
10 /// This file a TargetTransformInfo::Concept conforming object specific
11 /// to the WebAssembly target machine.
12 ///
13 /// It uses the target's detailed information to provide more precise answers to
14 /// certain TTI queries, while letting the target independent and default TTI
15 /// implementations handle the rest.
16 ///
17 //===----------------------------------------------------------------------===//
18 
19 #ifndef LLVM_LIB_TARGET_WEBASSEMBLY_WEBASSEMBLYTARGETTRANSFORMINFO_H
20 #define LLVM_LIB_TARGET_WEBASSEMBLY_WEBASSEMBLYTARGETTRANSFORMINFO_H
21 
22 #include "WebAssemblyTargetMachine.h"
23 #include "llvm/CodeGen/BasicTTIImpl.h"
24 #include <algorithm>
25 
26 namespace llvm {
27 
28 class WebAssemblyTTIImpl final : public BasicTTIImplBase<WebAssemblyTTIImpl> {
29   typedef BasicTTIImplBase<WebAssemblyTTIImpl> BaseT;
30   typedef TargetTransformInfo TTI;
31   friend BaseT;
32 
33   const WebAssemblySubtarget *ST;
34   const WebAssemblyTargetLowering *TLI;
35 
36   const WebAssemblySubtarget *getST() const { return ST; }
37   const WebAssemblyTargetLowering *getTLI() const { return TLI; }
38 
39 public:
40   WebAssemblyTTIImpl(const WebAssemblyTargetMachine *TM, const Function &F)
41       : BaseT(TM, F.getParent()->getDataLayout()), ST(TM->getSubtargetImpl(F)),
42         TLI(ST->getTargetLowering()) {}
43 
44   /// \name Scalar TTI Implementations
45   /// @{
46 
47   // TODO: Implement more Scalar TTI for WebAssembly
48 
49   TTI::PopcntSupportKind getPopcntSupport(unsigned TyWidth) const;
50 
51   void getUnrollingPreferences(Loop *L, ScalarEvolution &SE,
52                                TTI::UnrollingPreferences &UP,
53                                OptimizationRemarkEmitter *ORE) const;
54 
55   /// @}
56 
57   /// \name Vector TTI Implementations
58   /// @{
59 
60   unsigned getNumberOfRegisters(unsigned ClassID) const;
61   TypeSize getRegisterBitWidth(TargetTransformInfo::RegisterKind K) const;
62   InstructionCost getArithmeticInstrCost(
63       unsigned Opcode, Type *Ty, TTI::TargetCostKind CostKind,
64       TTI::OperandValueInfo Op1Info = {TTI::OK_AnyValue, TTI::OP_None},
65       TTI::OperandValueInfo Op2Info = {TTI::OK_AnyValue, TTI::OP_None},
66       ArrayRef<const Value *> Args = ArrayRef<const Value *>(),
67       const Instruction *CxtI = nullptr);
68   using BaseT::getVectorInstrCost;
69   InstructionCost getVectorInstrCost(unsigned Opcode, Type *Val,
70                                      TTI::TargetCostKind CostKind,
71                                      unsigned Index, Value *Op0, Value *Op1);
72 
73   /// @}
74 
75   bool areInlineCompatible(const Function *Caller,
76                            const Function *Callee) const;
77 
78   bool supportsTailCalls() const;
79 };
80 
81 } // end namespace llvm
82 
83 #endif
84