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| //===- ARMLegalizerInfo ------------------------------------------*- 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 declares the targeting of the Machinelegalizer class for ARM.
/// \todo This should be generated by TableGen.
//===----------------------------------------------------------------------===//
#ifndef LLVM_LIB_TARGET_ARM_ARMMACHINELEGALIZER_H
#define LLVM_LIB_TARGET_ARM_ARMMACHINELEGALIZER_H
#include "llvm/ADT/IndexedMap.h"
#include "llvm/CodeGen/GlobalISel/GISelChangeObserver.h"
#include "llvm/CodeGen/GlobalISel/LegalizerInfo.h"
#include "llvm/CodeGen/RuntimeLibcalls.h"
#include "llvm/IR/Instructions.h"
namespace llvm {
class ARMSubtarget;
/// This class provides the information for the target register banks.
class ARMLegalizerInfo : public LegalizerInfo {
public:
ARMLegalizerInfo(const ARMSubtarget &ST);
bool legalizeCustom(MachineInstr &MI, MachineRegisterInfo &MRI,
MachineIRBuilder &MIRBuilder,
GISelChangeObserver &Observer) const override;
private:
void setFCmpLibcallsGNU();
void setFCmpLibcallsAEABI();
struct FCmpLibcallInfo {
// Which libcall this is.
RTLIB::Libcall LibcallID;
// The predicate to be used when comparing the value returned by the
// function with a relevant constant (currently hard-coded to zero). This is
// necessary because often the libcall will return e.g. a value greater than
// 0 to represent 'true' and anything negative to represent 'false', or
// maybe 0 to represent 'true' and non-zero for 'false'. If no comparison is
// needed, this should be CmpInst::BAD_ICMP_PREDICATE.
CmpInst::Predicate Predicate;
};
using FCmpLibcallsList = SmallVector<FCmpLibcallInfo, 2>;
// Map from each FCmp predicate to the corresponding libcall infos. A FCmp
// instruction may be lowered to one or two libcalls, which is why we need a
// list. If two libcalls are needed, their results will be OR'ed.
using FCmpLibcallsMapTy = IndexedMap<FCmpLibcallsList>;
FCmpLibcallsMapTy FCmp32Libcalls;
FCmpLibcallsMapTy FCmp64Libcalls;
// Get the libcall(s) corresponding to \p Predicate for operands of \p Size
// bits.
FCmpLibcallsList getFCmpLibcalls(CmpInst::Predicate, unsigned Size) const;
};
} // End llvm namespace.
#endif
|