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