SystemZSubtarget.cpp
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//===-- SystemZSubtarget.cpp - SystemZ subtarget information --------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
#include "SystemZSubtarget.h"
#include "MCTargetDesc/SystemZMCTargetDesc.h"
#include "llvm/IR/GlobalValue.h"
#include "llvm/Target/TargetMachine.h"
using namespace llvm;
#define DEBUG_TYPE "systemz-subtarget"
#define GET_SUBTARGETINFO_TARGET_DESC
#define GET_SUBTARGETINFO_CTOR
#include "SystemZGenSubtargetInfo.inc"
static cl::opt<bool> UseSubRegLiveness(
"systemz-subreg-liveness",
cl::desc("Enable subregister liveness tracking for SystemZ (experimental)"),
cl::Hidden);
// Pin the vtable to this file.
void SystemZSubtarget::anchor() {}
SystemZSubtarget &
SystemZSubtarget::initializeSubtargetDependencies(StringRef CPU, StringRef FS) {
StringRef CPUName = CPU;
if (CPUName.empty())
CPUName = "generic";
// Parse features string.
ParseSubtargetFeatures(CPUName, FS);
// -msoft-float implies -mno-vx.
if (HasSoftFloat)
HasVector = false;
return *this;
}
SystemZSubtarget::SystemZSubtarget(const Triple &TT, const std::string &CPU,
const std::string &FS,
const TargetMachine &TM)
: SystemZGenSubtargetInfo(TT, CPU, FS), HasDistinctOps(false),
HasLoadStoreOnCond(false), HasHighWord(false), HasFPExtension(false),
HasPopulationCount(false), HasMessageSecurityAssist3(false),
HasMessageSecurityAssist4(false), HasResetReferenceBitsMultiple(false),
HasFastSerialization(false), HasInterlockedAccess1(false),
HasMiscellaneousExtensions(false),
HasExecutionHint(false), HasLoadAndTrap(false),
HasTransactionalExecution(false), HasProcessorAssist(false),
HasDFPZonedConversion(false), HasEnhancedDAT2(false),
HasVector(false), HasLoadStoreOnCond2(false),
HasLoadAndZeroRightmostByte(false), HasMessageSecurityAssist5(false),
HasDFPPackedConversion(false),
HasMiscellaneousExtensions2(false), HasGuardedStorage(false),
HasMessageSecurityAssist7(false), HasMessageSecurityAssist8(false),
HasVectorEnhancements1(false), HasVectorPackedDecimal(false),
HasInsertReferenceBitsMultiple(false),
HasMiscellaneousExtensions3(false), HasMessageSecurityAssist9(false),
HasVectorEnhancements2(false), HasVectorPackedDecimalEnhancement(false),
HasEnhancedSort(false), HasDeflateConversion(false), HasSoftFloat(false),
TargetTriple(TT), InstrInfo(initializeSubtargetDependencies(CPU, FS)),
TLInfo(TM, *this), TSInfo(), FrameLowering() {}
bool SystemZSubtarget::enableSubRegLiveness() const {
return UseSubRegLiveness;
}
bool SystemZSubtarget::isPC32DBLSymbol(const GlobalValue *GV,
CodeModel::Model CM) const {
// PC32DBL accesses require the low bit to be clear.
//
// FIXME: Explicitly check for functions: the datalayout is currently
// missing information about function pointers.
const DataLayout &DL = GV->getParent()->getDataLayout();
if (GV->getPointerAlignment(DL) == 1 && !GV->getValueType()->isFunctionTy())
return false;
// For the small model, all locally-binding symbols are in range.
if (CM == CodeModel::Small)
return TLInfo.getTargetMachine().shouldAssumeDSOLocal(*GV->getParent(), GV);
// 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;
}