================ @@ -0,0 +1,56 @@ +//===- AVRTargetTransformInfo.h - AVR specific TTI ---------*- C++ -*-===// +// +// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. +// See https://llvm.org/LICENSE.txt for license information. +// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception +// +//===----------------------------------------------------------------------===// +/// \file +/// This file defines a TargetTransformInfoImplBase conforming object specific +/// to the AVR target machine. It uses the target's detailed information to +/// provide more precise answers to certain TTI queries, while letting the +/// target independent and default TTI implementations handle the rest. +/// +//===----------------------------------------------------------------------===// + +#ifndef LLVM_LIB_TARGET_AVR_AVRTARGETTRANSFORMINFO_H +#define LLVM_LIB_TARGET_AVR_AVRTARGETTRANSFORMINFO_H + +#include "AVRSubtarget.h" +#include "AVRTargetMachine.h" +#include "llvm/Analysis/TargetTransformInfo.h" +#include "llvm/CodeGen/BasicTTIImpl.h" +#include "llvm/IR/Function.h" +#include <optional> + +namespace llvm { + +class AVRTTIImpl final : public BasicTTIImplBase<AVRTTIImpl> { + using BaseT = BasicTTIImplBase<AVRTTIImpl>; + using TTI = TargetTransformInfo; + + friend BaseT; + + const AVRSubtarget *ST; + const AVRTargetLowering *TLI; + + const AVRSubtarget *getST() const { return ST; } + const AVRTargetLowering *getTLI() const { return TLI; } + +public: + explicit AVRTTIImpl(const AVRTargetMachine *TM, const Function &F) + : BaseT(TM, F.getDataLayout()), ST(TM->getSubtargetImpl(F)), + TLI(ST->getTargetLowering()) {} + + bool isLSRCostLess(const TargetTransformInfo::LSRCost &C1, + const TargetTransformInfo::LSRCost &C2) const override { + if (C2.Insns == ~0u) ---------------- tomtor wrote:
~0u is just the losing value constant (signals that a parameter set should be rejected). I am testing against it, because I add several terms and if one or more have this value (they should all have it or none) then we have an overflow and the total will no longer signal losing or the comparison gives a wrong result. It is just a safeguard, so that everything is better than the losing parameter set. I have not looked at the riscv definition of isLSRCostLess(). I am curious,will have a look at it later. I did print the isLSRCostLess() parameters and it IS called sometimes with ~0u values for the C2 parameters. https://github.com/llvm/llvm-project/pull/152028 _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org https://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
