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//===-- SystemZSubtarget.cpp - SystemZ subtarget information --------------===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
#include "SystemZSubtarget.h"
#include "MCTargetDesc/SystemZMCTargetDesc.h"
#include "llvm/IR/GlobalValue.h"
#include "llvm/Support/Host.h"
using namespace llvm;
#define DEBUG_TYPE "systemz-subtarget"
#define GET_SUBTARGETINFO_TARGET_DESC
#define GET_SUBTARGETINFO_CTOR
#include "SystemZGenSubtargetInfo.inc"
// Pin the vtable to this file.
void SystemZSubtarget::anchor() {}
SystemZSubtarget &
SystemZSubtarget::initializeSubtargetDependencies(StringRef CPU, StringRef FS) {
std::string CPUName = CPU;
if (CPUName.empty())
CPUName = "generic";
#if defined(__linux__) && defined(__s390x__)
if (CPUName == "generic")
CPUName = sys::getHostCPUName();
#endif
// Parse features string.
ParseSubtargetFeatures(CPUName, FS);
return *this;
}
SystemZSubtarget::SystemZSubtarget(const std::string &TT,
const std::string &CPU,
const std::string &FS,
const TargetMachine &TM)
: SystemZGenSubtargetInfo(TT, CPU, FS), HasDistinctOps(false),
HasLoadStoreOnCond(false), HasHighWord(false), HasFPExtension(false),
HasFastSerialization(false), HasInterlockedAccess1(false),
TargetTriple(TT),
// Make sure that global data has at least 16 bits of alignment by
// default, so that we can refer to it using LARL. We don't have any
// special requirements for stack variables though.
DL("E-m:e-i1:8:16-i8:8:16-i64:64-f128:64-a:8:16-n32:64"),
InstrInfo(initializeSubtargetDependencies(CPU, FS)), TLInfo(TM),
TSInfo(DL), FrameLowering() {}
// Return true if GV binds locally under reloc model RM.
static bool bindsLocally(const GlobalValue *GV, Reloc::Model RM) {
// For non-PIC, all symbols bind locally.
if (RM == Reloc::Static)
return true;
return GV->hasLocalLinkage() || !GV->hasDefaultVisibility();
}
bool SystemZSubtarget::isPC32DBLSymbol(const GlobalValue *GV,
Reloc::Model RM,
CodeModel::Model CM) const {
// PC32DBL accesses require the low bit to be clear. Note that a zero
// value selects the default alignment and is therefore OK.
if (GV->getAlignment() == 1)
return false;
// For the small model, all locally-binding symbols are in range.
if (CM == CodeModel::Small)
return bindsLocally(GV, RM);
// For Medium and above, assume that the symbol is not within the 4GB range.
// Taking the address of locally-defined text would be OK, but that
// case isn't easy to detect.
return false;
}
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