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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/CodeGen/TargetLoweringObjectFileImpl.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 TuneCPU, StringRef FS) {
if (CPU.empty())
CPU = "generic";
if (TuneCPU.empty())
TuneCPU = CPU;
// Parse features string.
ParseSubtargetFeatures(CPU, TuneCPU, FS);
// -msoft-float implies -mno-vx.
if (HasSoftFloat)
HasVector = false;
// -mno-vx implicitly disables all vector-related features.
if (!HasVector) {
HasVectorEnhancements1 = false;
HasVectorEnhancements2 = false;
HasVectorPackedDecimal = false;
HasVectorPackedDecimalEnhancement = false;
HasVectorPackedDecimalEnhancement2 = false;
}
return *this;
}
SystemZCallingConventionRegisters *
SystemZSubtarget::initializeSpecialRegisters() {
if (isTargetXPLINK64())
return new SystemZXPLINK64Registers;
else if (isTargetELF())
return new SystemZELFRegisters;
llvm_unreachable("Invalid Calling Convention. Cannot initialize Special "
"Call Registers!");
}
SystemZSubtarget::SystemZSubtarget(const Triple &TT, const std::string &CPU,
const std::string &TuneCPU,
const std::string &FS,
const TargetMachine &TM)
: SystemZGenSubtargetInfo(TT, CPU, TuneCPU, FS), TargetTriple(TT),
SpecialRegisters(initializeSpecialRegisters()),
InstrInfo(initializeSubtargetDependencies(CPU, TuneCPU, FS)),
TLInfo(TM, *this), FrameLowering(SystemZFrameLowering::create(*this)) {}
bool SystemZSubtarget::enableSubRegLiveness() const {
return UseSubRegLiveness;
}
bool SystemZSubtarget::isAddressedViaADA(const GlobalValue *GV) const {
if (const auto *GO = dyn_cast<GlobalObject>(GV)) {
// A R/O variable is placed in code section. If the R/O variable has as
// least two byte alignment, then generated code can use relative
// instructions to address the variable. Otherwise, use the ADA to address
// the variable.
if (GO->getAlignment() & 0x1) {
return true;
}
// getKindForGlobal only works with definitions
if (GO->isDeclaration()) {
return true;
}
// check AvailableExternallyLinkage here as getKindForGlobal() asserts
if (GO->hasAvailableExternallyLinkage()) {
return true;
}
SectionKind GOKind = TargetLoweringObjectFile::getKindForGlobal(
GO, TLInfo.getTargetMachine());
if (!GOKind.isReadOnly()) {
return true;
}
return false; // R/O variable with multiple of 2 byte alignment
}
return true;
}
bool SystemZSubtarget::isPC32DBLSymbol(const GlobalValue *GV,
CodeModel::Model CM) const {
if (isTargetzOS())
return !isAddressedViaADA(GV);
// 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->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);
// 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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