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      1 //==- WebAssemblyTargetTransformInfo.h - WebAssembly-specific TTI -*- C++ -*-=//
      2 //
      3 //                     The LLVM Compiler Infrastructure
      4 //
      5 // This file is distributed under the University of Illinois Open Source
      6 // License. See LICENSE.TXT for details.
      7 //
      8 //===----------------------------------------------------------------------===//
      9 ///
     10 /// \file
     11 /// \brief This file a TargetTransformInfo::Concept conforming object specific
     12 /// to the WebAssembly target machine.
     13 ///
     14 /// It uses the target's detailed information to provide more precise answers to
     15 /// certain TTI queries, while letting the target independent and default TTI
     16 /// implementations handle the rest.
     17 ///
     18 //===----------------------------------------------------------------------===//
     19 
     20 #ifndef LLVM_LIB_TARGET_WEBASSEMBLY_WEBASSEMBLYTARGETTRANSFORMINFO_H
     21 #define LLVM_LIB_TARGET_WEBASSEMBLY_WEBASSEMBLYTARGETTRANSFORMINFO_H
     22 
     23 #include "WebAssemblyTargetMachine.h"
     24 #include "llvm/CodeGen/BasicTTIImpl.h"
     25 #include <algorithm>
     26 
     27 namespace llvm {
     28 
     29 class WebAssemblyTTIImpl final : public BasicTTIImplBase<WebAssemblyTTIImpl> {
     30   typedef BasicTTIImplBase<WebAssemblyTTIImpl> BaseT;
     31   typedef TargetTransformInfo TTI;
     32   friend BaseT;
     33 
     34   const WebAssemblySubtarget *ST;
     35   const WebAssemblyTargetLowering *TLI;
     36 
     37   const WebAssemblySubtarget *getST() const { return ST; }
     38   const WebAssemblyTargetLowering *getTLI() const { return TLI; }
     39 
     40 public:
     41   WebAssemblyTTIImpl(const WebAssemblyTargetMachine *TM, const Function &F)
     42       : BaseT(TM, F.getParent()->getDataLayout()), ST(TM->getSubtargetImpl(F)),
     43         TLI(ST->getTargetLowering()) {}
     44 
     45   // Provide value semantics. MSVC requires that we spell all of these out.
     46   WebAssemblyTTIImpl(const WebAssemblyTTIImpl &Arg)
     47       : BaseT(static_cast<const BaseT &>(Arg)), ST(Arg.ST), TLI(Arg.TLI) {}
     48   WebAssemblyTTIImpl(WebAssemblyTTIImpl &&Arg)
     49       : BaseT(std::move(static_cast<BaseT &>(Arg))), ST(std::move(Arg.ST)),
     50         TLI(std::move(Arg.TLI)) {}
     51 
     52   /// \name Scalar TTI Implementations
     53   /// @{
     54 
     55   // TODO: Implement more Scalar TTI for WebAssembly
     56 
     57   TTI::PopcntSupportKind getPopcntSupport(unsigned TyWidth) const;
     58 
     59   /// @}
     60 
     61   /// \name Vector TTI Implementations
     62   /// @{
     63 
     64   // TODO: Implement Vector TTI for WebAssembly
     65 
     66   /// @}
     67 };
     68 
     69 } // end namespace llvm
     70 
     71 #endif
     72