1 //===-- SystemZSubtarget.cpp - SystemZ subtarget information --------------===//
2 //
3 //                     The LLVM Compiler Infrastructure
4 //
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
7 //
8 //===----------------------------------------------------------------------===//
9 
10 #include "SystemZSubtarget.h"
11 #include "MCTargetDesc/SystemZMCTargetDesc.h"
12 #include "llvm/IR/GlobalValue.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 // Pin the vtable to this file.
23 void SystemZSubtarget::anchor() {}
24 
25 SystemZSubtarget &
26 SystemZSubtarget::initializeSubtargetDependencies(StringRef CPU, StringRef FS) {
27   std::string CPUName = CPU;
28   if (CPUName.empty())
29     CPUName = "generic";
30   // Parse features string.
31   ParseSubtargetFeatures(CPUName, FS);
32   return *this;
33 }
34 
35 SystemZSubtarget::SystemZSubtarget(const Triple &TT, const std::string &CPU,
36                                    const std::string &FS,
37                                    const TargetMachine &TM)
38     : SystemZGenSubtargetInfo(TT, CPU, FS), HasDistinctOps(false),
39       HasLoadStoreOnCond(false), HasHighWord(false), HasFPExtension(false),
40       HasPopulationCount(false), HasFastSerialization(false),
41       HasInterlockedAccess1(false), HasMiscellaneousExtensions(false),
42       HasExecutionHint(false), HasLoadAndTrap(false),
43       HasTransactionalExecution(false), HasProcessorAssist(false),
44       HasVector(false), HasLoadStoreOnCond2(false),
45       HasLoadAndZeroRightmostByte(false),
46       TargetTriple(TT), InstrInfo(initializeSubtargetDependencies(CPU, FS)),
47       TLInfo(TM, *this), TSInfo(), FrameLowering() {}
48 
49 bool SystemZSubtarget::isPC32DBLSymbol(const GlobalValue *GV,
50                                        CodeModel::Model CM) const {
51   // PC32DBL accesses require the low bit to be clear.  Note that a zero
52   // value selects the default alignment and is therefore OK.
53   if (GV->getAlignment() == 1)
54     return false;
55 
56   // For the small model, all locally-binding symbols are in range.
57   if (CM == CodeModel::Small)
58     return TLInfo.getTargetMachine().shouldAssumeDSOLocal(*GV->getParent(), GV);
59 
60   // For Medium and above, assume that the symbol is not within the 4GB range.
61   // Taking the address of locally-defined text would be OK, but that
62   // case isn't easy to detect.
63   return false;
64 }
65