66 lines
2.4 KiB
C++
66 lines
2.4 KiB
C++
//===- ARMLegalizerInfo ------------------------------------------*- C++ -*-==//
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//
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// The LLVM Compiler Infrastructure
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//
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// This file is distributed under the University of Illinois Open Source
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// License. See LICENSE.TXT for details.
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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/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) 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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