llvm-6502/lib/Target/SystemZ/SystemZSubtarget.cpp
Richard Sandiford b284e1bf08 [SystemZ] Add STOC and STOCG
These instructions are allowed to trap even if the condition is false,
so for now they are only used for "*ptr = (cond ? x : *ptr)"-style
constructs.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@187111 91177308-0d34-0410-b5e6-96231b3b80d8
2013-07-25 08:57:02 +00:00

59 lines
2.0 KiB
C++

//===-- 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 "llvm/IR/GlobalValue.h"
#include "MCTargetDesc/SystemZMCTargetDesc.h"
#define GET_SUBTARGETINFO_TARGET_DESC
#define GET_SUBTARGETINFO_CTOR
#include "SystemZGenSubtargetInfo.inc"
using namespace llvm;
SystemZSubtarget::SystemZSubtarget(const std::string &TT,
const std::string &CPU,
const std::string &FS)
: SystemZGenSubtargetInfo(TT, CPU, FS), HasDistinctOps(false),
HasLoadStoreOnCond(false), TargetTriple(TT) {
std::string CPUName = CPU;
if (CPUName.empty())
CPUName = "z10";
// Parse features string.
ParseSubtargetFeatures(CPUName, FS);
}
// 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;
}