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 TargetSubtarget.
11 //
12 //===----------------------------------------------------------------------===//
13 
14 #include "SystemZSubtarget.h"
15 #include "SystemZ.h"
16 #include "SystemZGenSubtarget.inc"
17 #include "llvm/GlobalValue.h"
18 #include "llvm/Target/TargetMachine.h"
19 
20 using namespace llvm;
21 
22 SystemZSubtarget::SystemZSubtarget(const std::string &TT,
23                                    const std::string &FS):
24   HasZ10Insts(false) {
25   std::string CPU = "z9";
26 
27   // Parse features string.
28   ParseSubtargetFeatures(FS, CPU);
29 }
30 
31 /// True if accessing the GV requires an extra load.
32 bool SystemZSubtarget::GVRequiresExtraLoad(const GlobalValue* GV,
33                                            const TargetMachine& TM,
34                                            bool isDirectCall) const {
35   if (TM.getRelocationModel() == Reloc::PIC_) {
36     // Extra load is needed for all externally visible.
37     if (isDirectCall)
38       return false;
39 
40     if (GV->hasLocalLinkage() || GV->hasHiddenVisibility())
41       return false;
42 
43     return true;
44   }
45 
46   return false;
47 }
48