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llvm-mirror/lib/Target/AArch64/AArch64Subtarget.cpp
Tim Northover ca0f4dc4f0 AArch64/ARM64: move ARM64 into AArch64's place
This commit starts with a "git mv ARM64 AArch64" and continues out
from there, renaming the C++ classes, intrinsics, and other
target-local objects for consistency.

"ARM64" test directories are also moved, and tests that began their
life in ARM64 use an arm64 triple, those from AArch64 use an aarch64
triple. Both should be equivalent though.

This finishes the AArch64 merge, and everyone should feel free to
continue committing as normal now.

llvm-svn: 209577
2014-05-24 12:50:23 +00:00

117 lines
4.5 KiB
C++

//===-- AArch64Subtarget.cpp - AArch64 Subtarget Information ----*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the AArch64 specific subclass of TargetSubtarget.
//
//===----------------------------------------------------------------------===//
#include "AArch64InstrInfo.h"
#include "AArch64Subtarget.h"
#include "llvm/ADT/SmallVector.h"
#include "llvm/CodeGen/MachineScheduler.h"
#include "llvm/IR/GlobalValue.h"
#include "llvm/Support/TargetRegistry.h"
using namespace llvm;
#define DEBUG_TYPE "aarch64-subtarget"
#define GET_SUBTARGETINFO_CTOR
#define GET_SUBTARGETINFO_TARGET_DESC
#include "AArch64GenSubtargetInfo.inc"
static cl::opt<bool>
EnableEarlyIfConvert("aarch64-early-ifcvt", cl::desc("Enable the early if "
"converter pass"), cl::init(true), cl::Hidden);
AArch64Subtarget::AArch64Subtarget(const std::string &TT,
const std::string &CPU,
const std::string &FS, bool LittleEndian)
: AArch64GenSubtargetInfo(TT, CPU, FS), ARMProcFamily(Others),
HasFPARMv8(false), HasNEON(false), HasCrypto(false), HasCRC(false),
HasZeroCycleRegMove(false), HasZeroCycleZeroing(false), CPUString(CPU),
TargetTriple(TT), IsLittleEndian(LittleEndian) {
// Determine default and user-specified characteristics
if (CPUString.empty())
CPUString = "generic";
ParseSubtargetFeatures(CPUString, FS);
}
/// ClassifyGlobalReference - Find the target operand flags that describe
/// how a global value should be referenced for the current subtarget.
unsigned char
AArch64Subtarget::ClassifyGlobalReference(const GlobalValue *GV,
const TargetMachine &TM) const {
// Determine whether this is a reference to a definition or a declaration.
// Materializable GVs (in JIT lazy compilation mode) do not require an extra
// load from stub.
bool isDecl = GV->hasAvailableExternallyLinkage();
if (GV->isDeclaration() && !GV->isMaterializable())
isDecl = true;
// MachO large model always goes via a GOT, simply to get a single 8-byte
// absolute relocation on all global addresses.
if (TM.getCodeModel() == CodeModel::Large && isTargetMachO())
return AArch64II::MO_GOT;
// The small code mode's direct accesses use ADRP, which cannot necessarily
// produce the value 0 (if the code is above 4GB). Therefore they must use the
// GOT.
if (TM.getCodeModel() == CodeModel::Small && GV->isWeakForLinker() && isDecl)
return AArch64II::MO_GOT;
// If symbol visibility is hidden, the extra load is not needed if
// the symbol is definitely defined in the current translation unit.
// The handling of non-hidden symbols in PIC mode is rather target-dependent:
// + On MachO, if the symbol is defined in this module the GOT can be
// skipped.
// + On ELF, the R_AARCH64_COPY relocation means that even symbols actually
// defined could end up in unexpected places. Use a GOT.
if (TM.getRelocationModel() != Reloc::Static && GV->hasDefaultVisibility()) {
if (isTargetMachO())
return (isDecl || GV->isWeakForLinker()) ? AArch64II::MO_GOT
: AArch64II::MO_NO_FLAG;
else
// No need to go through the GOT for local symbols on ELF.
return GV->hasLocalLinkage() ? AArch64II::MO_NO_FLAG : AArch64II::MO_GOT;
}
return AArch64II::MO_NO_FLAG;
}
/// This function returns the name of a function which has an interface
/// like the non-standard bzero function, if such a function exists on
/// the current subtarget and it is considered prefereable over
/// memset with zero passed as the second argument. Otherwise it
/// returns null.
const char *AArch64Subtarget::getBZeroEntry() const {
// Prefer bzero on Darwin only.
if(isTargetDarwin())
return "bzero";
return nullptr;
}
void AArch64Subtarget::overrideSchedPolicy(MachineSchedPolicy &Policy,
MachineInstr *begin, MachineInstr *end,
unsigned NumRegionInstrs) const {
// LNT run (at least on Cyclone) showed reasonably significant gains for
// bi-directional scheduling. 253.perlbmk.
Policy.OnlyTopDown = false;
Policy.OnlyBottomUp = false;
}
bool AArch64Subtarget::enableEarlyIfConversion() const {
return EnableEarlyIfConvert;
}