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
initializeSubtargetDependencies(StringRef CPU,StringRef TuneCPU,StringRef FS)30 SystemZSubtarget &SystemZSubtarget::initializeSubtargetDependencies(
31 StringRef CPU, StringRef TuneCPU, StringRef FS) {
32 if (CPU.empty())
33 CPU = "generic";
34 if (TuneCPU.empty())
35 TuneCPU = CPU;
36 // Parse features string.
37 ParseSubtargetFeatures(CPU, TuneCPU, FS);
38
39 // -msoft-float implies -mno-vx.
40 if (HasSoftFloat)
41 HasVector = false;
42
43 // -mno-vx implicitly disables all vector-related features.
44 if (!HasVector) {
45 HasVectorEnhancements1 = false;
46 HasVectorEnhancements2 = false;
47 HasVectorPackedDecimal = false;
48 HasVectorPackedDecimalEnhancement = false;
49 HasVectorPackedDecimalEnhancement2 = false;
50 }
51
52 return *this;
53 }
54
55 SystemZCallingConventionRegisters *
initializeSpecialRegisters()56 SystemZSubtarget::initializeSpecialRegisters() {
57 if (isTargetXPLINK64())
58 return new SystemZXPLINK64Registers;
59 else if (isTargetELF())
60 return new SystemZELFRegisters;
61 else {
62 llvm_unreachable("Invalid Calling Convention. Cannot initialize Special "
63 "Call Registers!");
64 }
65 }
66
SystemZSubtarget(const Triple & TT,const std::string & CPU,const std::string & TuneCPU,const std::string & FS,const TargetMachine & TM)67 SystemZSubtarget::SystemZSubtarget(const Triple &TT, const std::string &CPU,
68 const std::string &TuneCPU,
69 const std::string &FS,
70 const TargetMachine &TM)
71 : SystemZGenSubtargetInfo(TT, CPU, TuneCPU, FS),
72 HasDistinctOps(false), HasLoadStoreOnCond(false), HasHighWord(false),
73 HasFPExtension(false), HasPopulationCount(false),
74 HasMessageSecurityAssist3(false), HasMessageSecurityAssist4(false),
75 HasResetReferenceBitsMultiple(false), HasFastSerialization(false),
76 HasInterlockedAccess1(false), HasMiscellaneousExtensions(false),
77 HasExecutionHint(false), HasLoadAndTrap(false),
78 HasTransactionalExecution(false), HasProcessorAssist(false),
79 HasDFPZonedConversion(false), HasEnhancedDAT2(false), HasVector(false),
80 HasLoadStoreOnCond2(false), HasLoadAndZeroRightmostByte(false),
81 HasMessageSecurityAssist5(false), HasDFPPackedConversion(false),
82 HasMiscellaneousExtensions2(false), HasGuardedStorage(false),
83 HasMessageSecurityAssist7(false), HasMessageSecurityAssist8(false),
84 HasVectorEnhancements1(false), HasVectorPackedDecimal(false),
85 HasInsertReferenceBitsMultiple(false), HasMiscellaneousExtensions3(false),
86 HasMessageSecurityAssist9(false), HasVectorEnhancements2(false),
87 HasVectorPackedDecimalEnhancement(false), HasEnhancedSort(false),
88 HasDeflateConversion(false), HasVectorPackedDecimalEnhancement2(false),
89 HasNNPAssist(false), HasBEAREnhancement(false),
90 HasResetDATProtection(false), HasProcessorActivityInstrumentation(false),
91 HasSoftFloat(false), TargetTriple(TT),
92 SpecialRegisters(initializeSpecialRegisters()),
93 InstrInfo(initializeSubtargetDependencies(CPU, TuneCPU, FS)),
94 TLInfo(TM, *this), FrameLowering(SystemZFrameLowering::create(*this)) {}
95
enableSubRegLiveness() const96 bool SystemZSubtarget::enableSubRegLiveness() const {
97 return UseSubRegLiveness;
98 }
99
isPC32DBLSymbol(const GlobalValue * GV,CodeModel::Model CM) const100 bool SystemZSubtarget::isPC32DBLSymbol(const GlobalValue *GV,
101 CodeModel::Model CM) const {
102 // PC32DBL accesses require the low bit to be clear.
103 //
104 // FIXME: Explicitly check for functions: the datalayout is currently
105 // missing information about function pointers.
106 const DataLayout &DL = GV->getParent()->getDataLayout();
107 if (GV->getPointerAlignment(DL) == 1 && !GV->getValueType()->isFunctionTy())
108 return false;
109
110 // For the small model, all locally-binding symbols are in range.
111 if (CM == CodeModel::Small)
112 return TLInfo.getTargetMachine().shouldAssumeDSOLocal(*GV->getParent(), GV);
113
114 // For Medium and above, assume that the symbol is not within the 4GB range.
115 // Taking the address of locally-defined text would be OK, but that
116 // case isn't easy to detect.
117 return false;
118 }
119