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1 //===- ARMLegalizerInfo ------------------------------------------*- C++ -*-==//
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2 //
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3 // The LLVM Compiler Infrastructure
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4 //
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5 // This file is distributed under the University of Illinois Open Source
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6 // License. See LICENSE.TXT for details.
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7 //
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8 //===----------------------------------------------------------------------===//
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9 /// \file
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10 /// This file declares the targeting of the Machinelegalizer class for ARM.
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11 /// \todo This should be generated by TableGen.
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12 //===----------------------------------------------------------------------===//
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13
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14 #ifndef LLVM_LIB_TARGET_ARM_ARMMACHINELEGALIZER_H
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15 #define LLVM_LIB_TARGET_ARM_ARMMACHINELEGALIZER_H
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16
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121
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17 #include "llvm/ADT/IndexedMap.h"
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120
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18 #include "llvm/CodeGen/GlobalISel/LegalizerInfo.h"
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121
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19 #include "llvm/CodeGen/RuntimeLibcalls.h"
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20 #include "llvm/IR/Instructions.h"
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120
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21
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22 namespace llvm {
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23
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121
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24 class ARMSubtarget;
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25
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26 /// This class provides the information for the target register banks.
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27 class ARMLegalizerInfo : public LegalizerInfo {
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28 public:
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29 ARMLegalizerInfo(const ARMSubtarget &ST);
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30
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31 bool legalizeCustom(MachineInstr &MI, MachineRegisterInfo &MRI,
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32 MachineIRBuilder &MIRBuilder) const override;
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33
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34 private:
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35 void setFCmpLibcallsGNU();
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36 void setFCmpLibcallsAEABI();
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37
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38 struct FCmpLibcallInfo {
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39 // Which libcall this is.
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40 RTLIB::Libcall LibcallID;
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41
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42 // The predicate to be used when comparing the value returned by the
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43 // function with a relevant constant (currently hard-coded to zero). This is
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44 // necessary because often the libcall will return e.g. a value greater than
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45 // 0 to represent 'true' and anything negative to represent 'false', or
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46 // maybe 0 to represent 'true' and non-zero for 'false'. If no comparison is
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47 // needed, this should be CmpInst::BAD_ICMP_PREDICATE.
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48 CmpInst::Predicate Predicate;
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49 };
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50 using FCmpLibcallsList = SmallVector<FCmpLibcallInfo, 2>;
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51
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52 // Map from each FCmp predicate to the corresponding libcall infos. A FCmp
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53 // instruction may be lowered to one or two libcalls, which is why we need a
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54 // list. If two libcalls are needed, their results will be OR'ed.
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55 using FCmpLibcallsMapTy = IndexedMap<FCmpLibcallsList>;
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56
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57 FCmpLibcallsMapTy FCmp32Libcalls;
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58 FCmpLibcallsMapTy FCmp64Libcalls;
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59
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60 // Get the libcall(s) corresponding to \p Predicate for operands of \p Size
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61 // bits.
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62 FCmpLibcallsList getFCmpLibcalls(CmpInst::Predicate, unsigned Size) const;
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120
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63 };
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64 } // End llvm namespace.
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65 #endif
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