//===--- LoongArch.cpp - Implement LoongArch target feature support -------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//
//
// This file implements LoongArch TargetInfo objects.
//
//===----------------------------------------------------------------------===//

#include "LoongArch.h"
#include "clang/Basic/Diagnostic.h"
#include "clang/Basic/MacroBuilder.h"
#include "clang/Basic/TargetBuiltins.h"
#include "llvm/TargetParser/LoongArchTargetParser.h"

using namespace clang;
using namespace clang::targets;

ArrayRef<const char *> LoongArchTargetInfo::getGCCRegNames() const {
  static const char *const GCCRegNames[] = {
      // General purpose registers.
      "$r0", "$r1", "$r2", "$r3", "$r4", "$r5", "$r6", "$r7", "$r8", "$r9",
      "$r10", "$r11", "$r12", "$r13", "$r14", "$r15", "$r16", "$r17", "$r18",
      "$r19", "$r20", "$r21", "$r22", "$r23", "$r24", "$r25", "$r26", "$r27",
      "$r28", "$r29", "$r30", "$r31",
      // Floating point registers.
      "$f0", "$f1", "$f2", "$f3", "$f4", "$f5", "$f6", "$f7", "$f8", "$f9",
      "$f10", "$f11", "$f12", "$f13", "$f14", "$f15", "$f16", "$f17", "$f18",
      "$f19", "$f20", "$f21", "$f22", "$f23", "$f24", "$f25", "$f26", "$f27",
      "$f28", "$f29", "$f30", "$f31",
      // Condition flag registers.
      "$fcc0", "$fcc1", "$fcc2", "$fcc3", "$fcc4", "$fcc5", "$fcc6", "$fcc7",
      // 128-bit vector registers.
      "$vr0", "$vr1", "$vr2", "$vr3", "$vr4", "$vr5", "$vr6", "$vr7", "$vr8",
      "$vr9", "$vr10", "$vr11", "$vr12", "$vr13", "$vr14", "$vr15", "$vr16",
      "$vr17", "$vr18", "$vr19", "$vr20", "$vr21", "$vr22", "$vr23", "$vr24",
      "$vr25", "$vr26", "$vr27", "$vr28", "$vr29", "$vr30", "$vr31",
      // 256-bit vector registers.
      "$xr0", "$xr1", "$xr2", "$xr3", "$xr4", "$xr5", "$xr6", "$xr7", "$xr8",
      "$xr9", "$xr10", "$xr11", "$xr12", "$xr13", "$xr14", "$xr15", "$xr16",
      "$xr17", "$xr18", "$xr19", "$xr20", "$xr21", "$xr22", "$xr23", "$xr24",
      "$xr25", "$xr26", "$xr27", "$xr28", "$xr29", "$xr30", "$xr31"};
  return llvm::ArrayRef(GCCRegNames);
}

ArrayRef<TargetInfo::GCCRegAlias>
LoongArchTargetInfo::getGCCRegAliases() const {
  static const TargetInfo::GCCRegAlias GCCRegAliases[] = {
      {{"zero", "$zero", "r0"}, "$r0"},
      {{"ra", "$ra", "r1"}, "$r1"},
      {{"tp", "$tp", "r2"}, "$r2"},
      {{"sp", "$sp", "r3"}, "$r3"},
      {{"a0", "$a0", "r4"}, "$r4"},
      {{"a1", "$a1", "r5"}, "$r5"},
      {{"a2", "$a2", "r6"}, "$r6"},
      {{"a3", "$a3", "r7"}, "$r7"},
      {{"a4", "$a4", "r8"}, "$r8"},
      {{"a5", "$a5", "r9"}, "$r9"},
      {{"a6", "$a6", "r10"}, "$r10"},
      {{"a7", "$a7", "r11"}, "$r11"},
      {{"t0", "$t0", "r12"}, "$r12"},
      {{"t1", "$t1", "r13"}, "$r13"},
      {{"t2", "$t2", "r14"}, "$r14"},
      {{"t3", "$t3", "r15"}, "$r15"},
      {{"t4", "$t4", "r16"}, "$r16"},
      {{"t5", "$t5", "r17"}, "$r17"},
      {{"t6", "$t6", "r18"}, "$r18"},
      {{"t7", "$t7", "r19"}, "$r19"},
      {{"t8", "$t8", "r20"}, "$r20"},
      {{"r21"}, "$r21"},
      {{"s9", "$s9", "r22", "fp", "$fp"}, "$r22"},
      {{"s0", "$s0", "r23"}, "$r23"},
      {{"s1", "$s1", "r24"}, "$r24"},
      {{"s2", "$s2", "r25"}, "$r25"},
      {{"s3", "$s3", "r26"}, "$r26"},
      {{"s4", "$s4", "r27"}, "$r27"},
      {{"s5", "$s5", "r28"}, "$r28"},
      {{"s6", "$s6", "r29"}, "$r29"},
      {{"s7", "$s7", "r30"}, "$r30"},
      {{"s8", "$s8", "r31"}, "$r31"},
      {{"fa0", "$fa0", "f0"}, "$f0"},
      {{"fa1", "$fa1", "f1"}, "$f1"},
      {{"fa2", "$fa2", "f2"}, "$f2"},
      {{"fa3", "$fa3", "f3"}, "$f3"},
      {{"fa4", "$fa4", "f4"}, "$f4"},
      {{"fa5", "$fa5", "f5"}, "$f5"},
      {{"fa6", "$fa6", "f6"}, "$f6"},
      {{"fa7", "$fa7", "f7"}, "$f7"},
      {{"ft0", "$ft0", "f8"}, "$f8"},
      {{"ft1", "$ft1", "f9"}, "$f9"},
      {{"ft2", "$ft2", "f10"}, "$f10"},
      {{"ft3", "$ft3", "f11"}, "$f11"},
      {{"ft4", "$ft4", "f12"}, "$f12"},
      {{"ft5", "$ft5", "f13"}, "$f13"},
      {{"ft6", "$ft6", "f14"}, "$f14"},
      {{"ft7", "$ft7", "f15"}, "$f15"},
      {{"ft8", "$ft8", "f16"}, "$f16"},
      {{"ft9", "$ft9", "f17"}, "$f17"},
      {{"ft10", "$ft10", "f18"}, "$f18"},
      {{"ft11", "$ft11", "f19"}, "$f19"},
      {{"ft12", "$ft12", "f20"}, "$f20"},
      {{"ft13", "$ft13", "f21"}, "$f21"},
      {{"ft14", "$ft14", "f22"}, "$f22"},
      {{"ft15", "$ft15", "f23"}, "$f23"},
      {{"fs0", "$fs0", "f24"}, "$f24"},
      {{"fs1", "$fs1", "f25"}, "$f25"},
      {{"fs2", "$fs2", "f26"}, "$f26"},
      {{"fs3", "$fs3", "f27"}, "$f27"},
      {{"fs4", "$fs4", "f28"}, "$f28"},
      {{"fs5", "$fs5", "f29"}, "$f29"},
      {{"fs6", "$fs6", "f30"}, "$f30"},
      {{"fs7", "$fs7", "f31"}, "$f31"},
      {{"fcc0"}, "$fcc0"},
      {{"fcc1"}, "$fcc1"},
      {{"fcc2"}, "$fcc2"},
      {{"fcc3"}, "$fcc3"},
      {{"fcc4"}, "$fcc4"},
      {{"fcc5"}, "$fcc5"},
      {{"fcc6"}, "$fcc6"},
      {{"fcc7"}, "$fcc7"},
  };
  return llvm::ArrayRef(GCCRegAliases);
}

bool LoongArchTargetInfo::validateAsmConstraint(
    const char *&Name, TargetInfo::ConstraintInfo &Info) const {
  // See the GCC definitions here:
  // https://gcc.gnu.org/onlinedocs/gccint/Machine-Constraints.html
  // Note that the 'm' constraint is handled in TargetInfo.
  switch (*Name) {
  default:
    return false;
  case 'f':
    // A floating-point register (if available).
    Info.setAllowsRegister();
    return true;
  case 'k':
    // A memory operand whose address is formed by a base register and
    // (optionally scaled) index register.
    Info.setAllowsMemory();
    return true;
  case 'l':
    // A signed 16-bit constant.
    Info.setRequiresImmediate(-32768, 32767);
    return true;
  case 'q':
    // A general-purpose register except for $r0 and $r1 (for the csrxchg
    // instruction)
    Info.setAllowsRegister();
    return true;
  case 'I':
    // A signed 12-bit constant (for arithmetic instructions).
    Info.setRequiresImmediate(-2048, 2047);
    return true;
  case 'J':
    // Integer zero.
    Info.setRequiresImmediate(0);
    return true;
  case 'K':
    // An unsigned 12-bit constant (for logic instructions).
    Info.setRequiresImmediate(0, 4095);
    return true;
  case 'Z':
    // ZB: An address that is held in a general-purpose register. The offset is
    //     zero.
    // ZC: A memory operand whose address is formed by a base register
    //     and offset that is suitable for use in instructions with the same
    //     addressing mode as ll.w and sc.w.
    if (Name[1] == 'C' || Name[1] == 'B') {
      Info.setAllowsMemory();
      ++Name; // Skip over 'Z'.
      return true;
    }
    return false;
  }
}

std::string
LoongArchTargetInfo::convertConstraint(const char *&Constraint) const {
  std::string R;
  switch (*Constraint) {
  case 'Z':
    // "ZC"/"ZB" are two-character constraints; add "^" hint for later
    // parsing.
    R = "^" + std::string(Constraint, 2);
    ++Constraint;
    break;
  default:
    R = TargetInfo::convertConstraint(Constraint);
    break;
  }
  return R;
}

void LoongArchTargetInfo::getTargetDefines(const LangOptions &Opts,
                                           MacroBuilder &Builder) const {
  Builder.defineMacro("__loongarch__");
  unsigned GRLen = getRegisterWidth();
  Builder.defineMacro("__loongarch_grlen", Twine(GRLen));
  if (GRLen == 64)
    Builder.defineMacro("__loongarch64");

  if (HasFeatureD)
    Builder.defineMacro("__loongarch_frlen", "64");
  else if (HasFeatureF)
    Builder.defineMacro("__loongarch_frlen", "32");
  else
    Builder.defineMacro("__loongarch_frlen", "0");

  // Define __loongarch_arch.
  StringRef ArchName = getCPU();
  if (ArchName == "loongarch64") {
    if (HasFeatureLSX) {
      // TODO: As more features of the V1.1 ISA are supported, a unified "v1.1"
      // arch feature set will be used to include all sub-features belonging to
      // the V1.1 ISA version.
      if (HasFeatureFrecipe && HasFeatureLAM_BH && HasFeatureLAMCAS &&
          HasFeatureLD_SEQ_SA && HasFeatureDiv32 && HasFeatureSCQ)
        Builder.defineMacro("__loongarch_arch",
                            Twine('"') + "la64v1.1" + Twine('"'));
      else
        Builder.defineMacro("__loongarch_arch",
                            Twine('"') + "la64v1.0" + Twine('"'));
    } else {
      Builder.defineMacro("__loongarch_arch",
                          Twine('"') + ArchName + Twine('"'));
    }
  } else {
    Builder.defineMacro("__loongarch_arch", Twine('"') + ArchName + Twine('"'));
  }

  // Define __loongarch_tune.
  StringRef TuneCPU = getTargetOpts().TuneCPU;
  if (TuneCPU.empty())
    TuneCPU = ArchName;
  Builder.defineMacro("__loongarch_tune", Twine('"') + TuneCPU + Twine('"'));

  if (HasFeatureLASX) {
    Builder.defineMacro("__loongarch_simd_width", "256");
    Builder.defineMacro("__loongarch_sx", Twine(1));
    Builder.defineMacro("__loongarch_asx", Twine(1));
  } else if (HasFeatureLSX) {
    Builder.defineMacro("__loongarch_simd_width", "128");
    Builder.defineMacro("__loongarch_sx", Twine(1));
  }
  if (HasFeatureFrecipe)
    Builder.defineMacro("__loongarch_frecipe", Twine(1));

  if (HasFeatureLAM_BH)
    Builder.defineMacro("__loongarch_lam_bh", Twine(1));

  if (HasFeatureLAMCAS)
    Builder.defineMacro("__loongarch_lamcas", Twine(1));

  if (HasFeatureLD_SEQ_SA)
    Builder.defineMacro("__loongarch_ld_seq_sa", Twine(1));

  if (HasFeatureDiv32)
    Builder.defineMacro("__loongarch_div32", Twine(1));

  if (HasFeatureSCQ)
    Builder.defineMacro("__loongarch_scq", Twine(1));

  StringRef ABI = getABI();
  if (ABI == "lp64d" || ABI == "lp64f" || ABI == "lp64s")
    Builder.defineMacro("__loongarch_lp64");

  if (ABI == "lp64d" || ABI == "ilp32d") {
    Builder.defineMacro("__loongarch_hard_float");
    Builder.defineMacro("__loongarch_double_float");
  } else if (ABI == "lp64f" || ABI == "ilp32f") {
    Builder.defineMacro("__loongarch_hard_float");
    Builder.defineMacro("__loongarch_single_float");
  } else if (ABI == "lp64s" || ABI == "ilp32s") {
    Builder.defineMacro("__loongarch_soft_float");
  }

  Builder.defineMacro("__GCC_HAVE_SYNC_COMPARE_AND_SWAP_1");
  Builder.defineMacro("__GCC_HAVE_SYNC_COMPARE_AND_SWAP_2");
  Builder.defineMacro("__GCC_HAVE_SYNC_COMPARE_AND_SWAP_4");
  if (GRLen == 64)
    Builder.defineMacro("__GCC_HAVE_SYNC_COMPARE_AND_SWAP_8");
}

static constexpr int NumBaseBuiltins =
    LoongArch::FirstLSXBuiltin - Builtin::FirstTSBuiltin;
static constexpr int NumLSXBuiltins =
    LoongArch::FirstLASXBuiltin - LoongArch::FirstLSXBuiltin;
static constexpr int NumLASXBuiltins =
    LoongArch::LastTSBuiltin - LoongArch::FirstLASXBuiltin;
static constexpr int NumBuiltins =
    LoongArch::LastTSBuiltin - Builtin::FirstTSBuiltin;
static_assert(NumBuiltins ==
              (NumBaseBuiltins + NumLSXBuiltins + NumLASXBuiltins));

static constexpr llvm::StringTable BuiltinBaseStrings =
    CLANG_BUILTIN_STR_TABLE_START
#define TARGET_BUILTIN CLANG_TARGET_BUILTIN_STR_TABLE
#include "clang/Basic/BuiltinsLoongArchBase.def"
#undef TARGET_BUILTIN
    ;

static constexpr auto BuiltinBaseInfos = Builtin::MakeInfos<NumBaseBuiltins>({
#define TARGET_BUILTIN CLANG_TARGET_BUILTIN_ENTRY
#include "clang/Basic/BuiltinsLoongArchBase.def"
#undef TARGET_BUILTIN
});

static constexpr llvm::StringTable BuiltinLSXStrings =
    CLANG_BUILTIN_STR_TABLE_START
#define TARGET_BUILTIN CLANG_TARGET_BUILTIN_STR_TABLE
#include "clang/Basic/BuiltinsLoongArchLSX.def"
#undef TARGET_BUILTIN
    ;

static constexpr auto BuiltinLSXInfos = Builtin::MakeInfos<NumLSXBuiltins>({
#define TARGET_BUILTIN CLANG_TARGET_BUILTIN_ENTRY
#include "clang/Basic/BuiltinsLoongArchLSX.def"
#undef TARGET_BUILTIN
});

static constexpr llvm::StringTable BuiltinLASXStrings =
    CLANG_BUILTIN_STR_TABLE_START
#define TARGET_BUILTIN CLANG_TARGET_BUILTIN_STR_TABLE
#include "clang/Basic/BuiltinsLoongArchLASX.def"
#undef TARGET_BUILTIN
    ;

static constexpr auto BuiltinLASXInfos = Builtin::MakeInfos<NumLASXBuiltins>({
#define TARGET_BUILTIN CLANG_TARGET_BUILTIN_ENTRY
#include "clang/Basic/BuiltinsLoongArchLASX.def"
#undef TARGET_BUILTIN
});

bool LoongArchTargetInfo::initFeatureMap(
    llvm::StringMap<bool> &Features, DiagnosticsEngine &Diags, StringRef CPU,
    const std::vector<std::string> &FeaturesVec) const {
  if (getTriple().getArch() == llvm::Triple::loongarch64)
    Features["64bit"] = true;
  if (getTriple().getArch() == llvm::Triple::loongarch32)
    Features["32bit"] = true;

  return TargetInfo::initFeatureMap(Features, Diags, CPU, FeaturesVec);
}

/// Return true if has this feature.
bool LoongArchTargetInfo::hasFeature(StringRef Feature) const {
  bool Is64Bit = getTriple().getArch() == llvm::Triple::loongarch64;
  // TODO: Handle more features.
  return llvm::StringSwitch<bool>(Feature)
      .Case("loongarch32", !Is64Bit)
      .Case("loongarch64", Is64Bit)
      .Case("32bit", !Is64Bit)
      .Case("64bit", Is64Bit)
      .Case("lsx", HasFeatureLSX)
      .Case("lasx", HasFeatureLASX)
      .Default(false);
}

llvm::SmallVector<Builtin::InfosShard>
LoongArchTargetInfo::getTargetBuiltins() const {
  return {
      {&BuiltinBaseStrings, BuiltinBaseInfos},
      {&BuiltinLSXStrings, BuiltinLSXInfos},
      {&BuiltinLASXStrings, BuiltinLASXInfos},
  };
}

bool LoongArchTargetInfo::handleTargetFeatures(
    std::vector<std::string> &Features, DiagnosticsEngine &Diags) {
  for (const auto &Feature : Features) {
    if (Feature == "+d" || Feature == "+f") {
      // "d" implies "f".
      HasFeatureF = true;
      if (Feature == "+d") {
        HasFeatureD = true;
      }
    } else if (Feature == "+lsx")
      HasFeatureLSX = true;
    else if (Feature == "+lasx")
      HasFeatureLASX = true;
    else if (Feature == "-ual")
      HasUnalignedAccess = false;
    else if (Feature == "+frecipe")
      HasFeatureFrecipe = true;
    else if (Feature == "+lam-bh")
      HasFeatureLAM_BH = true;
    else if (Feature == "+lamcas")
      HasFeatureLAMCAS = true;
    else if (Feature == "+ld-seq-sa")
      HasFeatureLD_SEQ_SA = true;
    else if (Feature == "+div32")
      HasFeatureDiv32 = true;
    else if (Feature == "+scq")
      HasFeatureSCQ = true;
  }
  return true;
}

enum class AttrFeatureKind { Arch, Tune, NoFeature, Feature };

static std::pair<AttrFeatureKind, llvm::StringRef>
getAttrFeatureTypeAndValue(llvm::StringRef AttrFeature) {
  if (auto Split = AttrFeature.split("="); !Split.second.empty()) {
    if (Split.first.trim() == "arch")
      return {AttrFeatureKind::Arch, Split.second.trim()};
    if (Split.first.trim() == "tune")
      return {AttrFeatureKind::Tune, Split.second.trim()};
  }
  if (AttrFeature.starts_with("no-"))
    return {AttrFeatureKind::NoFeature, AttrFeature.drop_front(3)};
  return {AttrFeatureKind::Feature, AttrFeature};
}

ParsedTargetAttr
LoongArchTargetInfo::parseTargetAttr(StringRef Features) const {
  ParsedTargetAttr Ret;
  if (Features == "default")
    return Ret;
  SmallVector<StringRef, 1> AttrFeatures;
  Features.split(AttrFeatures, ",");

  for (auto &Feature : AttrFeatures) {
    auto [Kind, Value] = getAttrFeatureTypeAndValue(Feature.trim());

    switch (Kind) {
    case AttrFeatureKind::Arch: {
      if (llvm::LoongArch::isValidArchName(Value) || Value == "la64v1.0" ||
          Value == "la64v1.1") {
        std::vector<llvm::StringRef> ArchFeatures;
        if (llvm::LoongArch::getArchFeatures(Value, ArchFeatures)) {
          Ret.Features.insert(Ret.Features.end(), ArchFeatures.begin(),
                              ArchFeatures.end());
        }

        if (!Ret.CPU.empty())
          Ret.Duplicate = "arch=";
        else if (Value == "la64v1.0" || Value == "la64v1.1")
          Ret.CPU = "loongarch64";
        else
          Ret.CPU = Value;
      } else {
        Ret.Features.push_back("!arch=" + Value.str());
      }
      break;
    }

    case AttrFeatureKind::Tune:
      if (!Ret.Tune.empty())
        Ret.Duplicate = "tune=";
      else
        Ret.Tune = Value;
      break;

    case AttrFeatureKind::NoFeature:
      Ret.Features.push_back("-" + Value.str());
      break;

    case AttrFeatureKind::Feature:
      Ret.Features.push_back("+" + Value.str());
      break;
    }
  }
  return Ret;
}

bool LoongArchTargetInfo::isValidCPUName(StringRef Name) const {
  return llvm::LoongArch::isValidCPUName(Name);
}

void LoongArchTargetInfo::fillValidCPUList(
    SmallVectorImpl<StringRef> &Values) const {
  llvm::LoongArch::fillValidCPUList(Values);
}

bool LoongArchTargetInfo::isValidFeatureName(StringRef Name) const {
  return llvm::LoongArch::isValidFeatureName(Name);
}