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
SystemZSubtarget(const Triple & TT,const std::string & CPU,const std::string & FS,const TargetMachine & TM)53 SystemZSubtarget::SystemZSubtarget(const Triple &TT, const std::string &CPU,
54 const std::string &FS,
55 const TargetMachine &TM)
56 : SystemZGenSubtargetInfo(TT, CPU, /*TuneCPU*/ CPU, FS),
57 HasDistinctOps(false), HasLoadStoreOnCond(false), HasHighWord(false),
58 HasFPExtension(false), HasPopulationCount(false),
59 HasMessageSecurityAssist3(false), HasMessageSecurityAssist4(false),
60 HasResetReferenceBitsMultiple(false), HasFastSerialization(false),
61 HasInterlockedAccess1(false), HasMiscellaneousExtensions(false),
62 HasExecutionHint(false), HasLoadAndTrap(false),
63 HasTransactionalExecution(false), HasProcessorAssist(false),
64 HasDFPZonedConversion(false), HasEnhancedDAT2(false),
65 HasVector(false), HasLoadStoreOnCond2(false),
66 HasLoadAndZeroRightmostByte(false), HasMessageSecurityAssist5(false),
67 HasDFPPackedConversion(false),
68 HasMiscellaneousExtensions2(false), HasGuardedStorage(false),
69 HasMessageSecurityAssist7(false), HasMessageSecurityAssist8(false),
70 HasVectorEnhancements1(false), HasVectorPackedDecimal(false),
71 HasInsertReferenceBitsMultiple(false),
72 HasMiscellaneousExtensions3(false), HasMessageSecurityAssist9(false),
73 HasVectorEnhancements2(false), HasVectorPackedDecimalEnhancement(false),
74 HasEnhancedSort(false), HasDeflateConversion(false), HasSoftFloat(false),
75 TargetTriple(TT), InstrInfo(initializeSubtargetDependencies(CPU, FS)),
76 TLInfo(TM, *this), TSInfo(), FrameLowering() {}
77
78
enableSubRegLiveness() const79 bool SystemZSubtarget::enableSubRegLiveness() const {
80 return UseSubRegLiveness;
81 }
82
isPC32DBLSymbol(const GlobalValue * GV,CodeModel::Model CM) const83 bool SystemZSubtarget::isPC32DBLSymbol(const GlobalValue *GV,
84 CodeModel::Model CM) const {
85 // PC32DBL accesses require the low bit to be clear.
86 //
87 // FIXME: Explicitly check for functions: the datalayout is currently
88 // missing information about function pointers.
89 const DataLayout &DL = GV->getParent()->getDataLayout();
90 if (GV->getPointerAlignment(DL) == 1 && !GV->getValueType()->isFunctionTy())
91 return false;
92
93 // For the small model, all locally-binding symbols are in range.
94 if (CM == CodeModel::Small)
95 return TLInfo.getTargetMachine().shouldAssumeDSOLocal(*GV->getParent(), GV);
96
97 // For Medium and above, assume that the symbol is not within the 4GB range.
98 // Taking the address of locally-defined text would be OK, but that
99 // case isn't easy to detect.
100 return false;
101 }
102