1 //===-- SystemZSubtarget.cpp - SystemZ subtarget information --------------===//
3 // The LLVM Compiler Infrastructure
5 // This file is distributed under the University of Illinois Open Source
6 // License. See LICENSE.TXT for details.
8 //===----------------------------------------------------------------------===//
10 #include "SystemZSubtarget.h"
11 #include "llvm/IR/GlobalValue.h"
12 #include "llvm/Support/Host.h"
13 #include "MCTargetDesc/SystemZMCTargetDesc.h"
15 #define GET_SUBTARGETINFO_TARGET_DESC
16 #define GET_SUBTARGETINFO_CTOR
17 #include "SystemZGenSubtargetInfo.inc"
21 SystemZSubtarget::SystemZSubtarget(const std::string &TT,
22 const std::string &CPU,
23 const std::string &FS)
24 : SystemZGenSubtargetInfo(TT, CPU, FS), HasDistinctOps(false),
25 HasLoadStoreOnCond(false), HasHighWord(false), HasFPExtension(false),
27 std::string CPUName = CPU;
30 #if defined(__linux__) && defined(__s390x__)
31 if (CPUName == "generic")
32 CPUName = sys::getHostCPUName();
35 // Parse features string.
36 ParseSubtargetFeatures(CPUName, FS);
39 // Return true if GV binds locally under reloc model RM.
40 static bool bindsLocally(const GlobalValue *GV, Reloc::Model RM) {
41 // For non-PIC, all symbols bind locally.
42 if (RM == Reloc::Static)
45 return GV->hasLocalLinkage() || !GV->hasDefaultVisibility();
48 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)
56 // For the small model, all locally-binding symbols are in range.
57 if (CM == CodeModel::Small)
58 return bindsLocally(GV, RM);
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.