-//===-- AArch64Subtarget.cpp - AArch64 Subtarget Information --------------===//
+//===-- AArch64Subtarget.cpp - AArch64 Subtarget Information ----*- C++ -*-===//
//
// The LLVM Compiler Infrastructure
//
//
//===----------------------------------------------------------------------===//
//
-// This file implements the AArch64 specific subclass of TargetSubtargetInfo.
+// This file implements the AArch64 specific subclass of TargetSubtarget.
//
//===----------------------------------------------------------------------===//
+#include "AArch64InstrInfo.h"
+#include "AArch64PBQPRegAlloc.h"
#include "AArch64Subtarget.h"
-#include "AArch64RegisterInfo.h"
-#include "MCTargetDesc/AArch64MCTargetDesc.h"
-#include "llvm/IR/GlobalValue.h"
-#include "llvm/Target/TargetSubtargetInfo.h"
-#include "llvm/Support/CommandLine.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_TARGET_DESC
#define GET_SUBTARGETINFO_CTOR
+#define GET_SUBTARGETINFO_TARGET_DESC
#include "AArch64GenSubtargetInfo.inc"
-using namespace llvm;
+static cl::opt<bool>
+EnableEarlyIfConvert("aarch64-early-ifcvt", cl::desc("Enable the early if "
+ "converter pass"), cl::init(true), cl::Hidden);
-// pin vtable to this file
-void AArch64Subtarget::anchor() {}
+AArch64Subtarget &
+AArch64Subtarget::initializeSubtargetDependencies(StringRef FS) {
+ // Determine default and user-specified characteristics
-AArch64Subtarget::AArch64Subtarget(StringRef TT, StringRef CPU, StringRef FS)
- : AArch64GenSubtargetInfo(TT, CPU, FS), HasFPARMv8(false), HasNEON(false),
- HasCrypto(false), TargetTriple(TT), CPUString(CPU) {
+ if (CPUString.empty())
+ CPUString = "generic";
- initializeSubtargetFeatures(CPU, FS);
+ ParseSubtargetFeatures(CPUString, FS);
+ return *this;
}
-void AArch64Subtarget::initializeSubtargetFeatures(StringRef CPU,
- StringRef FS) {
- if (CPU.empty())
- CPUString = "generic";
+AArch64Subtarget::AArch64Subtarget(const Triple &TT, const std::string &CPU,
+ const std::string &FS,
+ const TargetMachine &TM, bool LittleEndian)
+ : AArch64GenSubtargetInfo(TargetTuple(TT), CPU, FS), ARMProcFamily(Others),
+ HasV8_1aOps(false), HasFPARMv8(false), HasNEON(false), HasCrypto(false),
+ HasCRC(false), HasPerfMon(false), HasZeroCycleRegMove(false),
+ HasZeroCycleZeroing(false), StrictAlign(false), ReserveX18(false),
+ IsLittle(LittleEndian), CPUString(CPU), TargetTriple(TT), FrameLowering(),
+ InstrInfo(initializeSubtargetDependencies(FS)), TSInfo(),
+ TLInfo(TM, *this) {}
+
+/// 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 {
+ bool isDef = GV->isStrongDefinitionForLinker();
+
+ // 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;
- std::string FullFS = FS;
- if (CPUString == "generic") {
- // Enable FP by default.
- if (FullFS.empty())
- FullFS = "+fp-armv8";
+ // The small code mode's direct accesses use ADRP, which cannot necessarily
+ // produce the value 0 (if the code is above 4GB).
+ if (TM.getCodeModel() == CodeModel::Small && GV->hasExternalWeakLinkage()) {
+ // In PIC mode use the GOT, but in absolute mode use a constant pool load.
+ if (TM.getRelocationModel() == Reloc::Static)
+ return AArch64II::MO_CONSTPOOL;
else
- FullFS = "+fp-armv8," + FullFS;
+ return AArch64II::MO_GOT;
}
- ParseSubtargetFeatures(CPU, FullFS);
+ // 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 isDef ? AArch64II::MO_NO_FLAG : AArch64II::MO_GOT;
+ 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;
}
-bool AArch64Subtarget::GVIsIndirectSymbol(const GlobalValue *GV,
- Reloc::Model RelocM) const {
- if (RelocM == Reloc::Static)
- return false;
+std::unique_ptr<PBQPRAConstraint>
+AArch64Subtarget::getCustomPBQPConstraints() const {
+ if (!isCortexA57())
+ return nullptr;
- return !GV->hasLocalLinkage() && !GV->hasHiddenVisibility();
+ return llvm::make_unique<A57ChainingConstraint>();
}
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