| 1 | //===- ARMLegalizerInfo ------------------------------------------*- C++ -*-==// |
|---|---|
| 2 | // |
| 3 | // Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions. |
| 4 | // See https://llvm.org/LICENSE.txt for license information. |
| 5 | // SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception |
| 6 | // |
| 7 | //===----------------------------------------------------------------------===// |
| 8 | /// \file |
| 9 | /// This file declares the targeting of the Machinelegalizer class for ARM. |
| 10 | /// \todo This should be generated by TableGen. |
| 11 | //===----------------------------------------------------------------------===// |
| 12 | |
| 13 | #ifndef LLVM_LIB_TARGET_ARM_ARMMACHINELEGALIZER_H |
| 14 | #define LLVM_LIB_TARGET_ARM_ARMMACHINELEGALIZER_H |
| 15 | |
| 16 | #include "llvm/ADT/IndexedMap.h" |
| 17 | #include "llvm/CodeGen/GlobalISel/GISelChangeObserver.h" |
| 18 | #include "llvm/CodeGen/GlobalISel/LegalizerInfo.h" |
| 19 | #include "llvm/CodeGen/RuntimeLibcalls.h" |
| 20 | #include "llvm/IR/Instructions.h" |
| 21 | |
| 22 | namespace llvm { |
| 23 | |
| 24 | class ARMSubtarget; |
| 25 | |
| 26 | class ARMLegalizerInfo : public LegalizerInfo { |
| 27 | public: |
| 28 | ARMLegalizerInfo(const ARMSubtarget &ST); |
| 29 | |
| 30 | bool legalizeCustom(LegalizerHelper &Helper, MachineInstr &MI, |
| 31 | LostDebugLocObserver &LocObserver) const override; |
| 32 | |
| 33 | private: |
| 34 | void setFCmpLibcallsGNU(); |
| 35 | void setFCmpLibcallsAEABI(); |
| 36 | |
| 37 | struct FCmpLibcallInfo { |
| 38 | // Which libcall this is. |
| 39 | RTLIB::Libcall LibcallID; |
| 40 | |
| 41 | // The predicate to be used when comparing the value returned by the |
| 42 | // function with a relevant constant (currently hard-coded to zero). This is |
| 43 | // necessary because often the libcall will return e.g. a value greater than |
| 44 | // 0 to represent 'true' and anything negative to represent 'false', or |
| 45 | // maybe 0 to represent 'true' and non-zero for 'false'. If no comparison is |
| 46 | // needed, this should be CmpInst::BAD_ICMP_PREDICATE. |
| 47 | CmpInst::Predicate Predicate; |
| 48 | }; |
| 49 | using FCmpLibcallsList = SmallVector<FCmpLibcallInfo, 2>; |
| 50 | |
| 51 | // Map from each FCmp predicate to the corresponding libcall infos. A FCmp |
| 52 | // instruction may be lowered to one or two libcalls, which is why we need a |
| 53 | // list. If two libcalls are needed, their results will be OR'ed. |
| 54 | using FCmpLibcallsMapTy = IndexedMap<FCmpLibcallsList>; |
| 55 | |
| 56 | FCmpLibcallsMapTy FCmp32Libcalls; |
| 57 | FCmpLibcallsMapTy FCmp64Libcalls; |
| 58 | |
| 59 | // Get the libcall(s) corresponding to \p Predicate for operands of \p Size |
| 60 | // bits. |
| 61 | FCmpLibcallsList getFCmpLibcalls(CmpInst::Predicate, unsigned Size) const; |
| 62 | }; |
| 63 | } // End llvm namespace. |
| 64 | #endif |
| 65 |