1 //===-- SystemZSubtarget.cpp - SystemZ subtarget information --------------===//
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
9 #include "SystemZSubtarget.h"
10 #include "MCTargetDesc/SystemZMCTargetDesc.h"
11 #include "llvm/IR/GlobalValue.h"
12 #include "llvm/Target/TargetMachine.h"
13
14 using namespace llvm;
15
16 #define DEBUG_TYPE "systemz-subtarget"
17
18 #define GET_SUBTARGETINFO_TARGET_DESC
19 #define GET_SUBTARGETINFO_CTOR
20 #include "SystemZGenSubtargetInfo.inc"
21
22 static cl::opt<bool> UseSubRegLiveness(
23 "systemz-subreg-liveness",
24 cl::desc("Enable subregister liveness tracking for SystemZ (experimental)"),
25 cl::Hidden);
26
27 // Pin the vtable to this file.
anchor()28 void SystemZSubtarget::anchor() {}
29
30 SystemZSubtarget &
initializeSubtargetDependencies(StringRef CPU,StringRef FS)31 SystemZSubtarget::initializeSubtargetDependencies(StringRef CPU, StringRef FS) {
32 StringRef CPUName = CPU;
33 if (CPUName.empty())
34 CPUName = "generic";
35 // Parse features string.
36 ParseSubtargetFeatures(CPUName, /*TuneCPU*/ CPUName, FS);
37
38 // -msoft-float implies -mno-vx.
39 if (HasSoftFloat)
40 HasVector = false;
41
42 // -mno-vx implicitly disables all vector-related features.
43 if (!HasVector) {
44 HasVectorEnhancements1 = false;
45 HasVectorEnhancements2 = false;
46 HasVectorPackedDecimal = false;
47 HasVectorPackedDecimalEnhancement = false;
48 }
49
50 return *this;
51 }
52
53 SystemZCallingConventionRegisters *
initializeSpecialRegisters()54 SystemZSubtarget::initializeSpecialRegisters() {
55 if (isTargetXPLINK64())
56 return new SystemZXPLINK64Registers;
57 else if (isTargetELF())
58 return new SystemZELFRegisters;
59 else {
60 llvm_unreachable("Invalid Calling Convention. Cannot initialize Special "
61 "Call Registers!");
62 }
63 }
64
SystemZSubtarget(const Triple & TT,const std::string & CPU,const std::string & FS,const TargetMachine & TM)65 SystemZSubtarget::SystemZSubtarget(const Triple &TT, const std::string &CPU,
66 const std::string &FS,
67 const TargetMachine &TM)
68 : SystemZGenSubtargetInfo(TT, CPU, /*TuneCPU*/ CPU, FS),
69 HasDistinctOps(false), HasLoadStoreOnCond(false), HasHighWord(false),
70 HasFPExtension(false), HasPopulationCount(false),
71 HasMessageSecurityAssist3(false), HasMessageSecurityAssist4(false),
72 HasResetReferenceBitsMultiple(false), HasFastSerialization(false),
73 HasInterlockedAccess1(false), HasMiscellaneousExtensions(false),
74 HasExecutionHint(false), HasLoadAndTrap(false),
75 HasTransactionalExecution(false), HasProcessorAssist(false),
76 HasDFPZonedConversion(false), HasEnhancedDAT2(false), HasVector(false),
77 HasLoadStoreOnCond2(false), HasLoadAndZeroRightmostByte(false),
78 HasMessageSecurityAssist5(false), HasDFPPackedConversion(false),
79 HasMiscellaneousExtensions2(false), HasGuardedStorage(false),
80 HasMessageSecurityAssist7(false), HasMessageSecurityAssist8(false),
81 HasVectorEnhancements1(false), HasVectorPackedDecimal(false),
82 HasInsertReferenceBitsMultiple(false), HasMiscellaneousExtensions3(false),
83 HasMessageSecurityAssist9(false), HasVectorEnhancements2(false),
84 HasVectorPackedDecimalEnhancement(false), HasEnhancedSort(false),
85 HasDeflateConversion(false), HasSoftFloat(false), TargetTriple(TT),
86 SpecialRegisters(initializeSpecialRegisters()),
87 InstrInfo(initializeSubtargetDependencies(CPU, FS)), TLInfo(TM, *this),
88 TSInfo(), FrameLowering() {}
89
~SystemZSubtarget()90 SystemZSubtarget::~SystemZSubtarget() { delete getSpecialRegisters(); }
91
enableSubRegLiveness() const92 bool SystemZSubtarget::enableSubRegLiveness() const {
93 return UseSubRegLiveness;
94 }
95
isPC32DBLSymbol(const GlobalValue * GV,CodeModel::Model CM) const96 bool SystemZSubtarget::isPC32DBLSymbol(const GlobalValue *GV,
97 CodeModel::Model CM) const {
98 // PC32DBL accesses require the low bit to be clear.
99 //
100 // FIXME: Explicitly check for functions: the datalayout is currently
101 // missing information about function pointers.
102 const DataLayout &DL = GV->getParent()->getDataLayout();
103 if (GV->getPointerAlignment(DL) == 1 && !GV->getValueType()->isFunctionTy())
104 return false;
105
106 // For the small model, all locally-binding symbols are in range.
107 if (CM == CodeModel::Small)
108 return TLInfo.getTargetMachine().shouldAssumeDSOLocal(*GV->getParent(), GV);
109
110 // For Medium and above, assume that the symbol is not within the 4GB range.
111 // Taking the address of locally-defined text would be OK, but that
112 // case isn't easy to detect.
113 return false;
114 }
115