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/LegalizerInfo.h"
19 #include "llvm/CodeGen/RuntimeLibcalls.h"
20 #include "llvm/IR/Instructions.h"
26 /// This class provides the information for the target register banks.
27 class ARMLegalizerInfo : public LegalizerInfo {
29 ARMLegalizerInfo(const ARMSubtarget &ST);
31 bool legalizeCustom(MachineInstr &MI, MachineRegisterInfo &MRI,
32 MachineIRBuilder &MIRBuilder) const override;
35 void setFCmpLibcallsGNU();
36 void setFCmpLibcallsAEABI();
38 struct FCmpLibcallInfo {
39 // Which libcall this is.
40 RTLIB::Libcall LibcallID;
42 // The predicate to be used when comparing the value returned by the
43 // function with a relevant constant (currently hard-coded to zero). This is
44 // necessary because often the libcall will return e.g. a value greater than
45 // 0 to represent 'true' and anything negative to represent 'false', or
46 // maybe 0 to represent 'true' and non-zero for 'false'. If no comparison is
47 // needed, this should be CmpInst::BAD_ICMP_PREDICATE.
48 CmpInst::Predicate Predicate;
50 using FCmpLibcallsList = SmallVector<FCmpLibcallInfo, 2>;
52 // Map from each FCmp predicate to the corresponding libcall infos. A FCmp
53 // instruction may be lowered to one or two libcalls, which is why we need a
54 // list. If two libcalls are needed, their results will be OR'ed.
55 using FCmpLibcallsMapTy = IndexedMap<FCmpLibcallsList>;
57 FCmpLibcallsMapTy FCmp32Libcalls;
58 FCmpLibcallsMapTy FCmp64Libcalls;
60 // Get the libcall(s) corresponding to \p Predicate for operands of \p Size
62 FCmpLibcallsList getFCmpLibcalls(CmpInst::Predicate, unsigned Size) const;
64 } // End llvm namespace.