#include "ARMBaseInstrInfo.h"
#include "ARMBaseRegisterInfo.h"
#include "llvm/IR/Attributes.h"
-#include "llvm/IR/GlobalValue.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
cl::desc("Reserve R9, making it unavailable as GPR"));
static cl::opt<bool>
-DarwinUseMOVT("arm-darwin-use-movt", cl::init(true), cl::Hidden);
+ArmUseMOVT("arm-use-movt", cl::init(true), cl::Hidden);
static cl::opt<bool>
UseFusedMulOps("arm-use-mulops",
cl::init(true), cl::Hidden);
-static cl::opt<bool>
-StrictAlign("arm-strict-align", cl::Hidden,
- cl::desc("Disallow all unaligned memory accesses"));
+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,
+ NoRestrictedIT
+};
+
+static cl::opt<ITMode>
+IT(cl::desc("IT block support"), cl::Hidden, cl::init(DefaultIT),
+ cl::ZeroOrMore,
+ cl::values(clEnumValN(DefaultIT, "arm-default-it",
+ "Generate IT block based on arch"),
+ clEnumValN(RestrictedIT, "arm-restrict-it",
+ "Disallow deprecated IT based on ARMv8"),
+ clEnumValN(NoRestrictedIT, "arm-no-restrict-it",
+ "Allow IT blocks based on ARMv7"),
+ clEnumValEnd));
ARMSubtarget::ARMSubtarget(const std::string &TT, const std::string &CPU,
- const std::string &FS)
+ const std::string &FS, const TargetOptions &Options)
: ARMGenSubtargetInfo(TT, CPU, FS)
, ARMProcFamily(Others)
+ , ARMProcClass(None)
, stackAlignment(4)
, CPUString(CPU)
, TargetTriple(TT)
- , TargetABI(ARM_ABI_APCS) {
+ , Options(Options)
+ , TargetABI(ARM_ABI_UNKNOWN) {
initializeEnvironment();
resetSubtargetFeatures(CPU, FS);
}
HasV5TOps = false;
HasV5TEOps = false;
HasV6Ops = false;
+ HasV6MOps = false;
HasV6T2Ops = false;
HasV7Ops = false;
+ HasV8Ops = false;
HasVFPv2 = false;
HasVFPv3 = false;
HasVFPv4 = false;
+ HasFPARMv8 = false;
HasNEON = false;
+ MinSize = false;
UseNEONForSinglePrecisionFP = false;
UseMulOps = UseFusedMulOps;
SlowFPVMLx = false;
SlowFPBrcc = false;
InThumbMode = false;
HasThumb2 = false;
- IsMClass = false;
NoARM = false;
PostRAScheduler = false;
IsR9Reserved = ReserveR9;
AvoidMOVsShifterOperand = false;
HasRAS = false;
HasMPExtension = false;
+ HasVirtualization = false;
FPOnlySP = false;
+ HasPerfMon = false;
+ HasTrustZone = false;
+ HasCrypto = false;
+ HasCRC = false;
AllowsUnalignedMem = false;
Thumb2DSP = false;
UseNaClTrap = false;
+ UnsafeFPMath = false;
}
void ARMSubtarget::resetSubtargetFeatures(const MachineFunction *MF) {
initializeEnvironment();
resetSubtargetFeatures(CPU, FS);
}
+
+ MinSize =
+ FnAttrs.hasAttribute(AttributeSet::FunctionIndex, Attribute::MinSize);
}
void ARMSubtarget::resetSubtargetFeatures(StringRef CPU, StringRef FS) {
- if (CPUString.empty())
- CPUString = "generic";
+ if (CPUString.empty()) {
+ if (isTargetIOS() && TargetTriple.getArchName().endswith("v7s"))
+ // Default to the Swift CPU when targeting armv7s/thumbv7s.
+ CPUString = "swift";
+ else
+ CPUString = "generic";
+ }
// Insert the architecture feature derived from the target triple into the
// feature string. This is important for setting features that are implied
}
ParseSubtargetFeatures(CPUString, ArchFS);
- // Thumb2 implies at least V6T2. FIXME: Fix tests to explicitly specify a
- // ARM version or CPU and then remove this.
- if (!HasV6T2Ops && hasThumb2())
- HasV4TOps = HasV5TOps = HasV5TEOps = HasV6Ops = HasV6T2Ops = true;
+ // FIXME: This used enable V6T2 support implicitly for Thumb2 mode.
+ // Assert this for now to make the change obvious.
+ assert(hasV6T2Ops() || !hasThumb2());
// Keep a pointer to static instruction cost data for the specified CPU.
SchedModel = getSchedModelForCPU(CPUString);
// Initialize scheduling itinerary for the specified CPU.
InstrItins = getInstrItineraryForCPU(CPUString);
- if ((TargetTriple.getTriple().find("eabi") != std::string::npos) ||
- (isTargetIOS() && isMClass()))
- // FIXME: We might want to separate AAPCS and EABI. Some systems, e.g.
- // Darwin-EABI conforms to AACPS but not the rest of EABI.
- TargetABI = ARM_ABI_AAPCS;
+ if (TargetABI == ARM_ABI_UNKNOWN) {
+ switch (TargetTriple.getEnvironment()) {
+ case Triple::Android:
+ case Triple::EABI:
+ case Triple::EABIHF:
+ case Triple::GNUEABI:
+ case Triple::GNUEABIHF:
+ case Triple::MachO:
+ TargetABI = ARM_ABI_AAPCS;
+ break;
+ default:
+ if (isTargetIOS() && isMClass())
+ TargetABI = ARM_ABI_AAPCS;
+ else
+ TargetABI = ARM_ABI_APCS;
+ break;
+ }
+ }
if (isAAPCS_ABI())
stackAlignment = 8;
- if (!isTargetIOS())
- UseMovt = hasV6T2Ops();
- else {
+ UseMovt = hasV6T2Ops() && ArmUseMOVT;
+
+ if (isTargetMachO()) {
IsR9Reserved = ReserveR9 | !HasV6Ops;
- UseMovt = DarwinUseMOVT && hasV6T2Ops();
- SupportsTailCall = !getTargetTriple().isOSVersionLT(5, 0);
- }
+ SupportsTailCall = !isTargetIOS() || !getTargetTriple().isOSVersionLT(5, 0);
+ } else
+ IsR9Reserved = ReserveR9;
if (!isThumb() || hasThumb2())
PostRAScheduler = true;
- // v6+ may or may not support unaligned mem access depending on the system
- // configuration.
- if (!StrictAlign && hasV6Ops() && isTargetDarwin())
- AllowsUnalignedMem = 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 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()));
+ break;
+ case StrictAlign:
+ AllowsUnalignedMem = false;
+ break;
+ case NoStrictAlign:
+ AllowsUnalignedMem = true;
+ break;
+ }
+
+ switch (IT) {
+ case DefaultIT:
+ RestrictIT = hasV8Ops() ? true : false;
+ break;
+ case RestrictedIT:
+ RestrictIT = true;
+ break;
+ case NoRestrictedIT:
+ RestrictIT = false;
+ break;
+ }
+
+ // 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
+ (Options.UnsafeFPMath || isTargetDarwin()))
+ UseNEONForSinglePrecisionFP = true;
}
/// GVIsIndirectSymbol - true if the GV will be accessed via an indirect symbol.
if (GV->isDeclaration() && !GV->isMaterializable())
isDecl = true;
- if (!isTargetDarwin()) {
+ if (!isTargetMachO()) {
// Extra load is needed for all externally visible.
if (GV->hasLocalLinkage() || GV->hasHiddenVisibility())
return false;
return SchedModel->MispredictPenalty;
}
+bool ARMSubtarget::hasSinCos() const {
+ return getTargetTriple().getOS() == Triple::IOS &&
+ !getTargetTriple().isOSVersionLT(7, 0);
+}
+
bool ARMSubtarget::enablePostRAScheduler(
CodeGenOpt::Level OptLevel,
TargetSubtargetInfo::AntiDepBreakMode& Mode,
RegClassVector& CriticalPathRCs) const {
- Mode = TargetSubtargetInfo::ANTIDEP_CRITICAL;
- CriticalPathRCs.clear();
- CriticalPathRCs.push_back(&ARM::GPRRegClass);
+ Mode = TargetSubtargetInfo::ANTIDEP_NONE;
return PostRAScheduler && OptLevel >= CodeGenOpt::Default;
}
projects / oota-llvm.git / blobdiff