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to reflect the new license. We understand that people may be surprised that we're moving the header entirely to discuss the new license. We checked this carefully with the Foundation's lawyer and we believe this is the correct approach. Essentially, all code in the project is now made available by the LLVM project under our new license, so you will see that the license headers include that license only. Some of our contributors have contributed code under our old license, and accordingly, we have retained a copy of our old license notice in the top-level files in each project and repository. llvm-svn: 351636
67 lines
2.5 KiB
C++
67 lines
2.5 KiB
C++
//===- ARMLegalizerInfo ------------------------------------------*- 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 declares the targeting of the Machinelegalizer class for ARM.
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/// \todo This should be generated by TableGen.
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//===----------------------------------------------------------------------===//
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#ifndef LLVM_LIB_TARGET_ARM_ARMMACHINELEGALIZER_H
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#define LLVM_LIB_TARGET_ARM_ARMMACHINELEGALIZER_H
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#include "llvm/ADT/IndexedMap.h"
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#include "llvm/CodeGen/GlobalISel/GISelChangeObserver.h"
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#include "llvm/CodeGen/GlobalISel/LegalizerInfo.h"
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#include "llvm/CodeGen/RuntimeLibcalls.h"
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#include "llvm/IR/Instructions.h"
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namespace llvm {
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class ARMSubtarget;
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/// This class provides the information for the target register banks.
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class ARMLegalizerInfo : public LegalizerInfo {
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public:
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ARMLegalizerInfo(const ARMSubtarget &ST);
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bool legalizeCustom(MachineInstr &MI, MachineRegisterInfo &MRI,
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MachineIRBuilder &MIRBuilder,
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GISelChangeObserver &Observer) const override;
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private:
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void setFCmpLibcallsGNU();
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void setFCmpLibcallsAEABI();
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struct FCmpLibcallInfo {
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// Which libcall this is.
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RTLIB::Libcall LibcallID;
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// The predicate to be used when comparing the value returned by the
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// function with a relevant constant (currently hard-coded to zero). This is
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// necessary because often the libcall will return e.g. a value greater than
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// 0 to represent 'true' and anything negative to represent 'false', or
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// maybe 0 to represent 'true' and non-zero for 'false'. If no comparison is
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// needed, this should be CmpInst::BAD_ICMP_PREDICATE.
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CmpInst::Predicate Predicate;
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};
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using FCmpLibcallsList = SmallVector<FCmpLibcallInfo, 2>;
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// Map from each FCmp predicate to the corresponding libcall infos. A FCmp
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// instruction may be lowered to one or two libcalls, which is why we need a
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// list. If two libcalls are needed, their results will be OR'ed.
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using FCmpLibcallsMapTy = IndexedMap<FCmpLibcallsList>;
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FCmpLibcallsMapTy FCmp32Libcalls;
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FCmpLibcallsMapTy FCmp64Libcalls;
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// Get the libcall(s) corresponding to \p Predicate for operands of \p Size
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// bits.
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FCmpLibcallsList getFCmpLibcalls(CmpInst::Predicate, unsigned Size) const;
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};
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} // End llvm namespace.
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#endif
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