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1//===- ARMLegalizerInfo ------------------------------------------*- 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-exception6//7//===----------------------------------------------------------------------===//8/// \file9/// This file declares the targeting of the Machinelegalizer class for ARM.10/// \todo This should be generated by TableGen.11//===----------------------------------------------------------------------===//12 13#ifndef LLVM_LIB_TARGET_ARM_ARMMACHINELEGALIZER_H14#define LLVM_LIB_TARGET_ARM_ARMMACHINELEGALIZER_H15 16#include "llvm/ADT/IndexedMap.h"17#include "llvm/CodeGen/GlobalISel/GISelChangeObserver.h"18#include "llvm/CodeGen/GlobalISel/LegalizerInfo.h"19#include "llvm/CodeGen/RuntimeLibcallUtil.h"20#include "llvm/IR/Instructions.h"21 22namespace llvm {23 24class ARMSubtarget;25 26class ARMLegalizerInfo : public LegalizerInfo {27public:28 ARMLegalizerInfo(const ARMSubtarget &ST);29 30 bool legalizeCustom(LegalizerHelper &Helper, MachineInstr &MI,31 LostDebugLocObserver &LocObserver) const override;32 33private:34 void setFCmpLibcallsGNU();35 void setFCmpLibcallsAEABI();36 37 struct FCmpLibcallInfo {38 // Which libcall this is.39 RTLIB::Libcall LibcallID;40 41 // The predicate to be used when comparing the value returned by the42 // function with a relevant constant (currently hard-coded to zero). This is43 // necessary because often the libcall will return e.g. a value greater than44 // 0 to represent 'true' and anything negative to represent 'false', or45 // maybe 0 to represent 'true' and non-zero for 'false'. If no comparison is46 // needed, this should be CmpInst::BAD_ICMP_PREDICATE.47 CmpInst::Predicate Predicate;48 };49 using FCmpLibcallsList = SmallVector<FCmpLibcallInfo, 2>;50 51 // Map from each FCmp predicate to the corresponding libcall infos. A FCmp52 // instruction may be lowered to one or two libcalls, which is why we need a53 // list. If two libcalls are needed, their results will be OR'ed.54 using FCmpLibcallsMapTy = IndexedMap<FCmpLibcallsList>;55 56 FCmpLibcallsMapTy FCmp32Libcalls;57 FCmpLibcallsMapTy FCmp64Libcalls;58 59 // Get the libcall(s) corresponding to \p Predicate for operands of \p Size60 // bits.61 FCmpLibcallsList getFCmpLibcalls(CmpInst::Predicate, unsigned Size) const;62 63 const ARMSubtarget &ST;64};65} // End llvm namespace.66#endif67