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1 //===- SystemZSubtarget.cpp - SystemZ Subtarget Information -------*- C++ -*-=//
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 // This file implements the SystemZ specific subclass of TargetSubtargetInfo.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #include "SystemZSubtarget.h"
15 #include "SystemZ.h"
16 #include "llvm/GlobalValue.h"
17 #include "llvm/Target/TargetMachine.h"
18 #include "llvm/Support/TargetRegistry.h"
19 
20 #define GET_SUBTARGETINFO_TARGET_DESC
21 #define GET_SUBTARGETINFO_CTOR
22 #include "SystemZGenSubtargetInfo.inc"
23 
24 using namespace llvm;
25 
SystemZSubtarget(const std::string & TT,const std::string & CPU,const std::string & FS)26 SystemZSubtarget::SystemZSubtarget(const std::string &TT,
27                                    const std::string &CPU,
28                                    const std::string &FS):
29   SystemZGenSubtargetInfo(TT, CPU, FS), HasZ10Insts(false) {
30   std::string CPUName = CPU;
31   if (CPUName.empty())
32     CPUName = "z9";
33 
34   // Parse features string.
35   ParseSubtargetFeatures(CPUName, FS);
36 }
37 
38 /// True if accessing the GV requires an extra load.
GVRequiresExtraLoad(const GlobalValue * GV,const TargetMachine & TM,bool isDirectCall) const39 bool SystemZSubtarget::GVRequiresExtraLoad(const GlobalValue* GV,
40                                            const TargetMachine& TM,
41                                            bool isDirectCall) const {
42   if (TM.getRelocationModel() == Reloc::PIC_) {
43     // Extra load is needed for all externally visible.
44     if (isDirectCall)
45       return false;
46 
47     if (GV->hasLocalLinkage() || GV->hasHiddenVisibility())
48       return false;
49 
50     return true;
51   }
52 
53   return false;
54 }
55