#include "ARMFrameLowering.h"
#include "ARMISelLowering.h"
#include "ARMInstrInfo.h"
+#include "ARMMachineFunctionInfo.h"
#include "ARMSelectionDAGInfo.h"
#include "ARMSubtarget.h"
-#include "ARMMachineFunctionInfo.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/Target/TargetInstrInfo.h"
#include "llvm/Target/TargetOptions.h"
#include "llvm/Target/TargetRegisterInfo.h"
-#include "llvm/CodeGen/MachineRegisterInfo.h"
using namespace llvm;
#define GET_SUBTARGETINFO_CTOR
#include "ARMGenSubtargetInfo.inc"
-static cl::opt<bool>
-ReserveR9("arm-reserve-r9", cl::Hidden,
- cl::desc("Reserve R9, making it unavailable as GPR"));
-
-static cl::opt<bool>
-ArmUseMOVT("arm-use-movt", cl::init(true), cl::Hidden);
-
static cl::opt<bool>
UseFusedMulOps("arm-use-mulops",
cl::init(true), cl::Hidden);
-namespace {
-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));
-static std::string computeDataLayout(ARMSubtarget &ST) {
- std::string Ret = "";
-
- if (ST.isLittle())
- // Little endian.
- Ret += "e";
- else
- // Big endian.
- Ret += "E";
-
- Ret += DataLayout::getManglingComponent(ST.getTargetTriple());
-
- // Pointers are 32 bits and aligned to 32 bits.
- Ret += "-p:32:32";
-
- // On thumb, i16,i18 and i1 have natural aligment requirements, but we try to
- // align to 32.
- if (ST.isThumb())
- Ret += "-i1:8:32-i8:8:32-i16:16:32";
-
- // ABIs other than APCS have 64 bit integers with natural alignment.
- if (!ST.isAPCS_ABI())
- Ret += "-i64:64";
-
- // We have 64 bits floats. The APCS ABI requires them to be aligned to 32
- // bits, others to 64 bits. We always try to align to 64 bits.
- if (ST.isAPCS_ABI())
- Ret += "-f64:32:64";
-
- // We have 128 and 64 bit vectors. The APCS ABI aligns them to 32 bits, others
- // to 64. We always ty to give them natural alignment.
- if (ST.isAPCS_ABI())
- Ret += "-v64:32:64-v128:32:128";
- else
- Ret += "-v128:64:128";
-
- // Try to align aggregates to 32 bits (the default is 64 bits, which has no
- // particular hardware support on 32-bit ARM).
- Ret += "-a:0:32";
-
- // Integer registers are 32 bits.
- Ret += "-n32";
-
- // The stack is 128 bit aligned on NaCl, 64 bit aligned on AAPCS and 32 bit
- // aligned everywhere else.
- if (ST.isTargetNaCl())
- Ret += "-S128";
- else if (ST.isAAPCS_ABI())
- Ret += "-S64";
- else
- Ret += "-S32";
-
- return Ret;
-}
+/// 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.
return *this;
}
-ARMSubtarget::ARMSubtarget(const std::string &TT, const std::string &CPU,
- const std::string &FS, const TargetMachine &TM,
- bool IsLittle)
+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), TargetABI(ARM_ABI_UNKNOWN),
- DL(computeDataLayout(initializeSubtargetDependencies(CPU, FS))),
- TSInfo(DL),
+ 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),
- FrameLowering(!isThumb1Only()
- ? new ARMFrameLowering(*this)
- : (ARMFrameLowering *)new Thumb1FrameLowering(*this)) {}
+ TLInfo(TM, *this) {}
void ARMSubtarget::initializeEnvironment() {
HasV4TOps = false;
HasV5TEOps = false;
HasV6Ops = false;
HasV6MOps = false;
+ HasV6KOps = false;
HasV6T2Ops = false;
HasV7Ops = false;
HasV8Ops = false;
+ HasV8_1aOps = false;
HasVFPv2 = false;
HasVFPv3 = false;
HasVFPv4 = false;
HasVMLxForwarding = false;
SlowFPBrcc = false;
InThumbMode = false;
+ UseSoftFloat = false;
HasThumb2 = false;
NoARM = 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::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;
- SupportsTailCall = !isTargetIOS() || !getTargetTriple().isOSVersionLT(5, 0);
- } else {
- IsR9Reserved = ReserveR9;
- SupportsTailCall = !isThumb1Only();
- }
-
- if (Align == 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()));
- } else {
- AllowsUnalignedMem = !(Align == StrictAlign);
- }
-
- // No v6M core supports unaligned memory access (v6M ARM ARM A3.2)
- if (isV6M())
- AllowsUnalignedMem = false;
+ // FIXME: Completely disable sibcall for Thumb1 since ThumbRegisterInfo::
+ // emitEpilogue is not ready for them. Thumb tail calls also use t2B, as
+ // the Thumb1 16-bit unconditional branch doesn't have sufficient relocation
+ // support in the assembler and linker to be used. This would need to be
+ // fixed to fully support tail calls in Thumb1.
+ //
+ // Doing this is tricky, since the LDM/POP instruction on Thumb doesn't take
+ // LR. This means if we need to reload LR, it takes an extra instructions,
+ // which outweighs the value of the tail call; but here we don't know yet
+ // whether LR is going to be used. Probably the right approach is to
+ // generate the tail call here and turn it back into CALL/RET in
+ // emitEpilogue if LR is used.
+
+ // Thumb1 PIC calls to external symbols use BX, so they can be tail calls,
+ // but we need to make sure there are enough registers; the only valid
+ // registers are the 4 used for parameters. We don't currently do this
+ // case.
+
+ SupportsTailCall = !isThumb1Only();
+
+ if (isTargetMachO() && isTargetIOS() && getTargetTriple().isOSVersionLT(5, 0))
+ SupportsTailCall = false;
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;
}
}
return getTargetTriple().isiOS() && !getTargetTriple().isOSVersionLT(7, 0);
}
+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::enablePostMachineScheduler() const {
+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());
}
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 UseMovt && (isTargetWindows() ||
- !MF.getFunction()->getAttributes().hasAttribute(
- AttributeSet::FunctionIndex, Attribute::MinSize));
+ 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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