bb1765179e
Replace "concept based polymorphism" with simpler PImpl idiom. This pursues two goals: * Enforce static type checking. Previously, target implementations hid base class methods and type checking was impossible. Now that they override the methods, the compiler will complain on mismatched signatures. * Make the code easier to navigate. Previously, if you asked your favorite LSP server to show a method (e.g. `getInstructionCost()`), it would show you methods from `TTI`, `TTI::Concept`, `TTI::Model`, `TTIImplBase`, and target overrides. Now it is two less :) There are three commits to hopefully simplify the review. The first commit removes `TTI::Model`. This is done by deriving `TargetTransformInfoImplBase` from `TTI::Concept`. This is possible because they implement the same set of interfaces with identical signatures. The first commit makes `TargetTransformImplBase` polymorphic, which means all derived classes should `override` its methods. This is done in second commit to make the first one smaller. It appeared infeasible to extract this into a separate PR because the first commit landed separately would result in tons of `-Woverloaded-virtual` warnings (and break `-Werror` builds). The third commit eliminates `TTI::Concept` by merging it with the only derived class `TargetTransformImplBase`. This commit could be extracted into a separate PR, but it touches the same lines in `TargetTransformInfoImpl.h` (removes `override` added by the second commit and adds `virtual`), so I thought it may make sense to land these two commits together. Pull Request: https://github.com/llvm/llvm-project/pull/136674
62 lines
2.4 KiB
C++
62 lines
2.4 KiB
C++
//===- LoongArchTargetTransformInfo.h - LoongArch specific TTI --*- C++ -*-===//
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//
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// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
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// See https://llvm.org/LICENSE.txt for license information.
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// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
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//
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//===----------------------------------------------------------------------===//
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/// \file
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/// This file a TargetTransformInfoImplBase conforming object specific to the
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/// LoongArch target machine. It uses the target's detailed information to
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/// provide more precise answers to certain TTI queries, while letting the
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/// target independent and default TTI implementations handle the rest.
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///
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_TARGET_LOONGARCH_LOONGARCHTARGETTRANSFORMINFO_H
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#define LLVM_LIB_TARGET_LOONGARCH_LOONGARCHTARGETTRANSFORMINFO_H
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#include "LoongArchSubtarget.h"
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#include "LoongArchTargetMachine.h"
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#include "llvm/Analysis/TargetTransformInfo.h"
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#include "llvm/CodeGen/BasicTTIImpl.h"
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namespace llvm {
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class LoongArchTTIImpl : public BasicTTIImplBase<LoongArchTTIImpl> {
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typedef BasicTTIImplBase<LoongArchTTIImpl> BaseT;
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typedef TargetTransformInfo TTI;
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friend BaseT;
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enum LoongArchRegisterClass { GPRRC, FPRRC, VRRC };
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const LoongArchSubtarget *ST;
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const LoongArchTargetLowering *TLI;
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const LoongArchSubtarget *getST() const { return ST; }
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const LoongArchTargetLowering *getTLI() const { return TLI; }
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public:
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explicit LoongArchTTIImpl(const LoongArchTargetMachine *TM, const Function &F)
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: BaseT(TM, F.getDataLayout()), ST(TM->getSubtargetImpl(F)),
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TLI(ST->getTargetLowering()) {}
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TypeSize
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getRegisterBitWidth(TargetTransformInfo::RegisterKind K) const override;
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unsigned getNumberOfRegisters(unsigned ClassID) const override;
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unsigned getRegisterClassForType(bool Vector,
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Type *Ty = nullptr) const override;
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unsigned getMaxInterleaveFactor(ElementCount VF) const override;
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const char *getRegisterClassName(unsigned ClassID) const override;
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TTI::PopcntSupportKind getPopcntSupport(unsigned TyWidth) const override;
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unsigned getCacheLineSize() const override;
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unsigned getPrefetchDistance() const override;
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bool enableWritePrefetching() const override;
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// TODO: Implement more hooks to provide TTI machinery for LoongArch.
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};
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} // end namespace llvm
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#endif // LLVM_LIB_TARGET_LOONGARCH_LOONGARCHTARGETTRANSFORMINFO_H
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