//===----------------------------------------------------------------------===//
#include "ARMSubtarget.h"
-#include "ARMBaseInstrInfo.h"
-#include "ARMBaseRegisterInfo.h"
+#include "ARMFrameLowering.h"
+#include "ARMISelLowering.h"
+#include "ARMInstrInfo.h"
+#include "ARMMachineFunctionInfo.h"
+#include "ARMSelectionDAGInfo.h"
+#include "ARMSubtarget.h"
+#include "ARMTargetMachine.h"
+#include "Thumb1FrameLowering.h"
+#include "Thumb1InstrInfo.h"
+#include "Thumb2InstrInfo.h"
+#include "llvm/CodeGen/MachineRegisterInfo.h"
#include "llvm/IR/Attributes.h"
#include "llvm/IR/Function.h"
#include "llvm/IR/GlobalValue.h"
#include "llvm/Support/CommandLine.h"
#include "llvm/Target/TargetInstrInfo.h"
#include "llvm/Target/TargetOptions.h"
-
-#define GET_SUBTARGETINFO_TARGET_DESC
-#define GET_SUBTARGETINFO_CTOR
-#include "ARMGenSubtargetInfo.inc"
+#include "llvm/Target/TargetRegisterInfo.h"
using namespace llvm;
-static cl::opt<bool>
-ReserveR9("arm-reserve-r9", cl::Hidden,
- cl::desc("Reserve R9, making it unavailable as GPR"));
+#define DEBUG_TYPE "arm-subtarget"
-static cl::opt<bool>
-ArmUseMOVT("arm-use-movt", cl::init(true), cl::Hidden);
+#define GET_SUBTARGETINFO_TARGET_DESC
+#define GET_SUBTARGETINFO_CTOR
+#include "ARMGenSubtargetInfo.inc"
static cl::opt<bool>
UseFusedMulOps("arm-use-mulops",
cl::init(true), cl::Hidden);
-enum AlignMode {
- DefaultAlign,
- StrictAlign,
- NoStrictAlign
-};
-
-static cl::opt<AlignMode>
-Align(cl::desc("Load/store alignment support"),
- cl::Hidden, cl::init(DefaultAlign),
- cl::values(
- clEnumValN(DefaultAlign, "arm-default-align",
- "Generate unaligned accesses only on hardware/OS "
- "combinations that are known to support them"),
- clEnumValN(StrictAlign, "arm-strict-align",
- "Disallow all unaligned memory accesses"),
- clEnumValN(NoStrictAlign, "arm-no-strict-align",
- "Allow unaligned memory accesses"),
- clEnumValEnd));
-
enum ITMode {
DefaultIT,
RestrictedIT,
"Allow IT blocks based on ARMv7"),
clEnumValEnd));
-ARMSubtarget::ARMSubtarget(const std::string &TT, const std::string &CPU,
- const std::string &FS, bool IsLittle,
- const TargetOptions &Options)
- : ARMGenSubtargetInfo(TT, CPU, FS)
- , ARMProcFamily(Others)
- , ARMProcClass(None)
- , stackAlignment(4)
- , CPUString(CPU)
- , IsLittle(IsLittle)
- , TargetTriple(TT)
- , Options(Options)
- , TargetABI(ARM_ABI_UNKNOWN) {
+/// ForceFastISel - Use the fast-isel, even for subtargets where it is not
+/// currently supported (for testing only).
+static cl::opt<bool>
+ForceFastISel("arm-force-fast-isel",
+ cl::init(false), cl::Hidden);
+
+/// initializeSubtargetDependencies - Initializes using a CPU and feature string
+/// so that we can use initializer lists for subtarget initialization.
+ARMSubtarget &ARMSubtarget::initializeSubtargetDependencies(StringRef CPU,
+ StringRef FS) {
initializeEnvironment();
- resetSubtargetFeatures(CPU, FS);
+ initSubtargetFeatures(CPU, FS);
+ return *this;
}
+ARMFrameLowering *ARMSubtarget::initializeFrameLowering(StringRef CPU,
+ StringRef FS) {
+ ARMSubtarget &STI = initializeSubtargetDependencies(CPU, FS);
+ if (STI.isThumb1Only())
+ return (ARMFrameLowering *)new Thumb1FrameLowering(STI);
+
+ return new ARMFrameLowering(STI);
+}
+
+ARMSubtarget::ARMSubtarget(const Triple &TT, const std::string &CPU,
+ const std::string &FS,
+ const ARMBaseTargetMachine &TM, bool IsLittle)
+ : ARMGenSubtargetInfo(TT, CPU, FS), ARMProcFamily(Others),
+ ARMProcClass(None), stackAlignment(4), CPUString(CPU), IsLittle(IsLittle),
+ TargetTriple(TT), Options(TM.Options), TM(TM),
+ FrameLowering(initializeFrameLowering(CPU, FS)),
+ // At this point initializeSubtargetDependencies has been called so
+ // we can query directly.
+ InstrInfo(isThumb1Only()
+ ? (ARMBaseInstrInfo *)new Thumb1InstrInfo(*this)
+ : !isThumb()
+ ? (ARMBaseInstrInfo *)new ARMInstrInfo(*this)
+ : (ARMBaseInstrInfo *)new Thumb2InstrInfo(*this)),
+ TLInfo(TM, *this) {}
+
void ARMSubtarget::initializeEnvironment() {
HasV4TOps = false;
HasV5TOps = false;
HasV5TEOps = false;
HasV6Ops = false;
HasV6MOps = false;
+ HasV6KOps = false;
HasV6T2Ops = false;
HasV7Ops = false;
HasV8Ops = false;
+ HasV8_1aOps = false;
HasVFPv2 = false;
HasVFPv3 = false;
HasVFPv4 = false;
HasFPARMv8 = false;
HasNEON = false;
- MinSize = false;
UseNEONForSinglePrecisionFP = false;
UseMulOps = UseFusedMulOps;
SlowFPVMLx = false;
HasVMLxForwarding = false;
SlowFPBrcc = false;
InThumbMode = false;
+ UseSoftFloat = false;
HasThumb2 = false;
NoARM = false;
- PostRAScheduler = false;
- IsR9Reserved = ReserveR9;
- UseMovt = false;
+ ReserveR9 = false;
+ NoMovt = false;
SupportsTailCall = false;
HasFP16 = false;
HasD16 = false;
HasCrypto = false;
HasCRC = false;
HasZeroCycleZeroing = false;
- AllowsUnalignedMem = false;
- Thumb2DSP = false;
+ StrictAlign = false;
+ HasDSP = false;
UseNaClTrap = false;
+ GenLongCalls = false;
UnsafeFPMath = false;
}
-void ARMSubtarget::resetSubtargetFeatures(const MachineFunction *MF) {
- AttributeSet FnAttrs = MF->getFunction()->getAttributes();
- Attribute CPUAttr = FnAttrs.getAttribute(AttributeSet::FunctionIndex,
- "target-cpu");
- Attribute FSAttr = FnAttrs.getAttribute(AttributeSet::FunctionIndex,
- "target-features");
- std::string CPU =
- !CPUAttr.hasAttribute(Attribute::None) ?CPUAttr.getValueAsString() : "";
- std::string FS =
- !FSAttr.hasAttribute(Attribute::None) ? FSAttr.getValueAsString() : "";
- if (!FS.empty()) {
- initializeEnvironment();
- resetSubtargetFeatures(CPU, FS);
- }
-
- MinSize =
- FnAttrs.hasAttribute(AttributeSet::FunctionIndex, Attribute::MinSize);
-}
-
-void ARMSubtarget::resetSubtargetFeatures(StringRef CPU, StringRef FS) {
+void ARMSubtarget::initSubtargetFeatures(StringRef CPU, StringRef FS) {
if (CPUString.empty()) {
- if (isTargetIOS() && TargetTriple.getArchName().endswith("v7s"))
+ if (isTargetDarwin() && TargetTriple.getArchName().endswith("v7s"))
// Default to the Swift CPU when targeting armv7s/thumbv7s.
CPUString = "swift";
else
// Insert the architecture feature derived from the target triple into the
// feature string. This is important for setting features that are implied
// based on the architecture version.
- std::string ArchFS = ARM_MC::ParseARMTriple(TargetTriple.getTriple(),
- CPUString);
+ std::string ArchFS = ARM_MC::ParseARMTriple(TargetTriple, CPUString);
if (!FS.empty()) {
if (!ArchFS.empty())
- ArchFS = ArchFS + "," + FS.str();
+ ArchFS = (Twine(ArchFS) + "," + FS).str();
else
ArchFS = FS;
}
// Initialize scheduling itinerary for the specified CPU.
InstrItins = getInstrItineraryForCPU(CPUString);
- if (TargetABI == ARM_ABI_UNKNOWN) {
- switch (TargetTriple.getEnvironment()) {
- case Triple::Android:
- case Triple::EABI:
- case Triple::EABIHF:
- case Triple::GNUEABI:
- case Triple::GNUEABIHF:
- TargetABI = ARM_ABI_AAPCS;
- break;
- default:
- if ((isTargetIOS() && isMClass()) ||
- (TargetTriple.isOSBinFormatMachO() &&
- TargetTriple.getOS() == Triple::UnknownOS))
- TargetABI = ARM_ABI_AAPCS;
- else
- TargetABI = ARM_ABI_APCS;
- break;
- }
- }
-
// FIXME: this is invalid for WindowsCE
- if (isTargetWindows()) {
- TargetABI = ARM_ABI_AAPCS;
+ if (isTargetWindows())
NoARM = true;
- }
if (isAAPCS_ABI())
stackAlignment = 8;
if (isTargetNaCl())
stackAlignment = 16;
- UseMovt = hasV6T2Ops() && ArmUseMOVT;
-
- if (isTargetMachO()) {
- IsR9Reserved = ReserveR9 | !HasV6Ops;
+ if (isTargetMachO())
SupportsTailCall = !isTargetIOS() || !getTargetTriple().isOSVersionLT(5, 0);
- } else {
- IsR9Reserved = ReserveR9;
+ else
SupportsTailCall = !isThumb1Only();
- }
-
- if (!isThumb() || hasThumb2())
- PostRAScheduler = true;
-
- switch (Align) {
- case DefaultAlign:
- // Assume pre-ARMv6 doesn't support unaligned accesses.
- //
- // ARMv6 may or may not support unaligned accesses depending on the
- // SCTLR.U bit, which is architecture-specific. We assume ARMv6
- // Darwin and NetBSD targets support unaligned accesses, and others don't.
- //
- // ARMv7 always has SCTLR.U set to 1, but it has a new SCTLR.A bit
- // which raises an alignment fault on unaligned accesses. Linux
- // defaults this bit to 0 and handles it as a system-wide (not
- // per-process) setting. It is therefore safe to assume that ARMv7+
- // Linux targets support unaligned accesses. The same goes for NaCl.
- //
- // The above behavior is consistent with GCC.
- AllowsUnalignedMem =
- (hasV7Ops() && (isTargetLinux() || isTargetNaCl() ||
- isTargetNetBSD())) ||
- (hasV6Ops() && (isTargetMachO() || isTargetNetBSD()));
- // The one exception is cortex-m0, which despite being v6, does not
- // support unaligned accesses. Rather than make the above boolean
- // expression even more obtuse, just override the value here.
- if (isThumb1Only() && isMClass())
- AllowsUnalignedMem = false;
- break;
- case StrictAlign:
- AllowsUnalignedMem = false;
- break;
- case NoStrictAlign:
- AllowsUnalignedMem = true;
- break;
- }
switch (IT) {
case DefaultIT:
- RestrictIT = hasV8Ops() ? true : false;
+ RestrictIT = hasV8Ops();
break;
case RestrictedIT:
RestrictIT = true;
}
// NEON f32 ops are non-IEEE 754 compliant. Darwin is ok with it by default.
- uint64_t Bits = getFeatureBits();
- if ((Bits & ARM::ProcA5 || Bits & ARM::ProcA8) && // Where this matters
+ const FeatureBitset &Bits = getFeatureBits();
+ if ((Bits[ARM::ProcA5] || Bits[ARM::ProcA8]) && // Where this matters
(Options.UnsafeFPMath || isTargetDarwin()))
UseNEONForSinglePrecisionFP = true;
}
+bool ARMSubtarget::isAPCS_ABI() const {
+ assert(TM.TargetABI != ARMBaseTargetMachine::ARM_ABI_UNKNOWN);
+ return TM.TargetABI == ARMBaseTargetMachine::ARM_ABI_APCS;
+}
+bool ARMSubtarget::isAAPCS_ABI() const {
+ assert(TM.TargetABI != ARMBaseTargetMachine::ARM_ABI_UNKNOWN);
+ return TM.TargetABI == ARMBaseTargetMachine::ARM_ABI_AAPCS;
+}
+
/// GVIsIndirectSymbol - true if the GV will be accessed via an indirect symbol.
bool
ARMSubtarget::GVIsIndirectSymbol(const GlobalValue *GV,
if (RelocM == Reloc::Static)
return false;
- // 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;
+ bool isDef = GV->isStrongDefinitionForLinker();
if (!isTargetMachO()) {
// Extra load is needed for all externally visible.
return false;
return true;
} else {
- if (RelocM == Reloc::PIC_) {
- // If this is a strong reference to a definition, it is definitely not
- // through a stub.
- if (!isDecl && !GV->isWeakForLinker())
- return false;
-
- // Unless we have a symbol with hidden visibility, we have to go through a
- // normal $non_lazy_ptr stub because this symbol might be resolved late.
- if (!GV->hasHiddenVisibility()) // Non-hidden $non_lazy_ptr reference.
- return true;
+ // If this is a strong reference to a definition, it is definitely not
+ // through a stub.
+ if (isDef)
+ return false;
+
+ // Unless we have a symbol with hidden visibility, we have to go through a
+ // normal $non_lazy_ptr stub because this symbol might be resolved late.
+ if (!GV->hasHiddenVisibility()) // Non-hidden $non_lazy_ptr reference.
+ return true;
+ if (RelocM == Reloc::PIC_) {
// If symbol visibility is hidden, we have a stub for common symbol
// references and external declarations.
- if (isDecl || GV->hasCommonLinkage())
+ if (GV->isDeclarationForLinker() || GV->hasCommonLinkage())
// Hidden $non_lazy_ptr reference.
return true;
-
- return false;
- } else {
- // If this is a strong reference to a definition, it is definitely not
- // through a stub.
- if (!isDecl && !GV->isWeakForLinker())
- return false;
-
- // Unless we have a symbol with hidden visibility, we have to go through a
- // normal $non_lazy_ptr stub because this symbol might be resolved late.
- if (!GV->hasHiddenVisibility()) // Non-hidden $non_lazy_ptr reference.
- return true;
}
}
}
unsigned ARMSubtarget::getMispredictionPenalty() const {
- return SchedModel->MispredictPenalty;
+ return SchedModel.MispredictPenalty;
}
bool ARMSubtarget::hasSinCos() const {
- return getTargetTriple().getOS() == Triple::IOS &&
- !getTargetTriple().isOSVersionLT(7, 0);
+ return getTargetTriple().isiOS() && !getTargetTriple().isOSVersionLT(7, 0);
}
-bool ARMSubtarget::enablePostRAScheduler(
- CodeGenOpt::Level OptLevel,
- TargetSubtargetInfo::AntiDepBreakMode& Mode,
- RegClassVector& CriticalPathRCs) const {
- Mode = TargetSubtargetInfo::ANTIDEP_NONE;
- return PostRAScheduler && OptLevel >= CodeGenOpt::Default;
+bool ARMSubtarget::enableMachineScheduler() const {
+ // Enable the MachineScheduler before register allocation for out-of-order
+ // architectures where we do not use the PostRA scheduler anymore (for now
+ // restricted to swift).
+ return getSchedModel().isOutOfOrder() && isSwift();
+}
+
+// This overrides the PostRAScheduler bit in the SchedModel for any CPU.
+bool ARMSubtarget::enablePostRAScheduler() const {
+ // No need for PostRA scheduling on out of order CPUs (for now restricted to
+ // swift).
+ if (getSchedModel().isOutOfOrder() && isSwift())
+ return false;
+ return (!isThumb() || hasThumb2());
+}
+
+bool ARMSubtarget::enableAtomicExpand() const {
+ return hasAnyDataBarrier() && !isThumb1Only();
+}
+
+bool ARMSubtarget::useStride4VFPs(const MachineFunction &MF) const {
+ return isSwift() && !MF.getFunction()->optForMinSize();
+}
+
+bool ARMSubtarget::useMovt(const MachineFunction &MF) const {
+ // NOTE Windows on ARM needs to use mov.w/mov.t pairs to materialise 32-bit
+ // immediates as it is inherently position independent, and may be out of
+ // range otherwise.
+ return !NoMovt && hasV6T2Ops() &&
+ (isTargetWindows() || !MF.getFunction()->optForMinSize());
+}
+
+bool ARMSubtarget::useFastISel() const {
+ // Enable fast-isel for any target, for testing only.
+ if (ForceFastISel)
+ return true;
+
+ // Limit fast-isel to the targets that are or have been tested.
+ if (!hasV6Ops())
+ return false;
+
+ // Thumb2 support on iOS; ARM support on iOS, Linux and NaCl.
+ return TM.Options.EnableFastISel &&
+ ((isTargetMachO() && !isThumb1Only()) ||
+ (isTargetLinux() && !isThumb()) || (isTargetNaCl() && !isThumb()));
}
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