llvm/lib/Analysis/TargetLibraryInfo.cpp

//===-- TargetLibraryInfo.cpp - Runtime library information ----------------==//
//
//                     The LLVM Compiler Infrastructure
//
// This file is distributed under the University of Illinois Open Source
// License. See LICENSE.TXT for details.
//
//===----------------------------------------------------------------------===//
//
// This file implements the TargetLibraryInfo class.
//
//===----------------------------------------------------------------------===//

#include "llvm/Analysis/TargetLibraryInfo.h"
#include "llvm/ADT/Triple.h"
#include "llvm/Support/CommandLine.h"
using namespace llvm;

static cl::opt<TargetLibraryInfoImpl::VectorLibrary> ClVectorLibrary(
    "vector-library", cl::Hidden, cl::desc("Vector functions library"),
    cl::init(TargetLibraryInfoImpl::NoLibrary),
    cl::values(clEnumValN(TargetLibraryInfoImpl::NoLibrary, "none",
                          "No vector functions library"),
               clEnumValN(TargetLibraryInfoImpl::Accelerate, "Accelerate",
                          "Accelerate framework"),
               clEnumValN(TargetLibraryInfoImpl::SVML, "SVML",
                          "Intel SVML library")));

StringRef const TargetLibraryInfoImpl::StandardNames[LibFunc::NumLibFuncs] = {
#define TLI_DEFINE_STRING
#include "llvm/Analysis/TargetLibraryInfo.def"
};

static bool hasSinCosPiStret(const Triple &T) {
  // Only Darwin variants have _stret versions of combined trig functions.
  if (!T.isOSDarwin())
    return false;

  // The ABI is rather complicated on x86, so don't do anything special there.
  if (T.getArch() == Triple::x86)
    return false;

  if (T.isMacOSX() && T.isMacOSXVersionLT(10, 9))
    return false;

  if (T.isiOS() && T.isOSVersionLT(7, 0))
    return false;

  return true;
}

/// initialize - Initialize the set of available library functions based on the
/// specified target triple.  This should be carefully written so that a missing
/// target triple gets a sane set of defaults.
static void initialize(TargetLibraryInfoImpl &TLI, const Triple &T,
                       ArrayRef<StringRef> StandardNames) {
  // Verify that the StandardNames array is in alphabetical order.
  assert(std::is_sorted(StandardNames.begin(), StandardNames.end(),
                        [](StringRef LHS, StringRef RHS) {
                          return LHS < RHS;
                        }) &&
         "TargetLibraryInfoImpl function names must be sorted");

  bool ShouldExtI32Param = false, ShouldExtI32Return = false,
       ShouldSignExtI32Param = false;
  // PowerPC64, Sparc64, SystemZ need signext/zeroext on i32 parameters and
  // returns corresponding to C-level ints and unsigned ints.
  if (T.getArch() == Triple::ppc64 || T.getArch() == Triple::ppc64le ||
      T.getArch() == Triple::sparcv9 || T.getArch() == Triple::systemz) {
    ShouldExtI32Param = true;
    ShouldExtI32Return = true;
  }
  // Mips, on the other hand, needs signext on i32 parameters corresponding
  // to both signed and unsigned ints.
  if (T.getArch() == Triple::mips || T.getArch() == Triple::mipsel ||
      T.getArch() == Triple::mips64 || T.getArch() == Triple::mips64el) {
    ShouldSignExtI32Param = true;
  }
  TLI.setShouldExtI32Param(ShouldExtI32Param);
  TLI.setShouldExtI32Return(ShouldExtI32Return);
  TLI.setShouldSignExtI32Param(ShouldSignExtI32Param);

  if (T.getArch() == Triple::r600 ||
      T.getArch() == Triple::amdgcn) {
    TLI.setUnavailable(LibFunc_ldexp);
    TLI.setUnavailable(LibFunc_ldexpf);
    TLI.setUnavailable(LibFunc_ldexpl);
    TLI.setUnavailable(LibFunc_exp10);
    TLI.setUnavailable(LibFunc_exp10f);
    TLI.setUnavailable(LibFunc_exp10l);
    TLI.setUnavailable(LibFunc_log10);
    TLI.setUnavailable(LibFunc_log10f);
    TLI.setUnavailable(LibFunc_log10l);
  }

  // There are no library implementations of mempcy and memset for AMD gpus and
  // these can be difficult to lower in the backend.
  if (T.getArch() == Triple::r600 ||
      T.getArch() == Triple::amdgcn) {
    TLI.setUnavailable(LibFunc_memcpy);
    TLI.setUnavailable(LibFunc_memset);
    TLI.setUnavailable(LibFunc_memset_pattern16);
    return;
  }

  // memset_pattern16 is only available on iOS 3.0 and Mac OS X 10.5 and later.
  // All versions of watchOS support it.
  if (T.isMacOSX()) {
    if (T.isMacOSXVersionLT(10, 5))
      TLI.setUnavailable(LibFunc_memset_pattern16);
  } else if (T.isiOS()) {
    if (T.isOSVersionLT(3, 0))
      TLI.setUnavailable(LibFunc_memset_pattern16);
  } else if (!T.isWatchOS()) {
    TLI.setUnavailable(LibFunc_memset_pattern16);
  }

  if (!hasSinCosPiStret(T)) {
    TLI.setUnavailable(LibFunc_sinpi);
    TLI.setUnavailable(LibFunc_sinpif);
    TLI.setUnavailable(LibFunc_cospi);
    TLI.setUnavailable(LibFunc_cospif);
    TLI.setUnavailable(LibFunc_sincospi_stret);
    TLI.setUnavailable(LibFunc_sincospif_stret);
  }

  if (T.isMacOSX() && T.getArch() == Triple::x86 &&
      !T.isMacOSXVersionLT(10, 7)) {
    // x86-32 OSX has a scheme where fwrite and fputs (and some other functions
    // we don't care about) have two versions; on recent OSX, the one we want
    // has a $UNIX2003 suffix. The two implementations are identical except
    // for the return value in some edge cases.  However, we don't want to
    // generate code that depends on the old symbols.
    TLI.setAvailableWithName(LibFunc_fwrite, "fwrite$UNIX2003");
    TLI.setAvailableWithName(LibFunc_fputs, "fputs$UNIX2003");
  }

  // iprintf and friends are only available on XCore and TCE.
  if (T.getArch() != Triple::xcore && T.getArch() != Triple::tce) {
    TLI.setUnavailable(LibFunc_iprintf);
    TLI.setUnavailable(LibFunc_siprintf);
    TLI.setUnavailable(LibFunc_fiprintf);
  }

  if (T.isOSWindows() && !T.isOSCygMing()) {
    // Win32 does not support long double
    TLI.setUnavailable(LibFunc_acosl);
    TLI.setUnavailable(LibFunc_asinl);
    TLI.setUnavailable(LibFunc_atanl);
    TLI.setUnavailable(LibFunc_atan2l);
    TLI.setUnavailable(LibFunc_ceill);
    TLI.setUnavailable(LibFunc_copysignl);
    TLI.setUnavailable(LibFunc_cosl);
    TLI.setUnavailable(LibFunc_coshl);
    TLI.setUnavailable(LibFunc_expl);
    TLI.setUnavailable(LibFunc_fabsf); // Win32 and Win64 both lack fabsf
    TLI.setUnavailable(LibFunc_fabsl);
    TLI.setUnavailable(LibFunc_floorl);
    TLI.setUnavailable(LibFunc_fmaxl);
    TLI.setUnavailable(LibFunc_fminl);
    TLI.setUnavailable(LibFunc_fmodl);
    TLI.setUnavailable(LibFunc_frexpl);
    TLI.setUnavailable(LibFunc_ldexpf);
    TLI.setUnavailable(LibFunc_ldexpl);
    TLI.setUnavailable(LibFunc_logl);
    TLI.setUnavailable(LibFunc_modfl);
    TLI.setUnavailable(LibFunc_powl);
    TLI.setUnavailable(LibFunc_sinl);
    TLI.setUnavailable(LibFunc_sinhl);
    TLI.setUnavailable(LibFunc_sqrtl);
    TLI.setUnavailable(LibFunc_tanl);
    TLI.setUnavailable(LibFunc_tanhl);

    // Win32 only has C89 math
    TLI.setUnavailable(LibFunc_acosh);
    TLI.setUnavailable(LibFunc_acoshf);
    TLI.setUnavailable(LibFunc_acoshl);
    TLI.setUnavailable(LibFunc_asinh);
    TLI.setUnavailable(LibFunc_asinhf);
    TLI.setUnavailable(LibFunc_asinhl);
    TLI.setUnavailable(LibFunc_atanh);
    TLI.setUnavailable(LibFunc_atanhf);
    TLI.setUnavailable(LibFunc_atanhl);
    TLI.setUnavailable(LibFunc_cbrt);
    TLI.setUnavailable(LibFunc_cbrtf);
    TLI.setUnavailable(LibFunc_cbrtl);
    TLI.setUnavailable(LibFunc_exp2);
    TLI.setUnavailable(LibFunc_exp2f);
    TLI.setUnavailable(LibFunc_exp2l);
    TLI.setUnavailable(LibFunc_expm1);
    TLI.setUnavailable(LibFunc_expm1f);
    TLI.setUnavailable(LibFunc_expm1l);
    TLI.setUnavailable(LibFunc_log2);
    TLI.setUnavailable(LibFunc_log2f);
    TLI.setUnavailable(LibFunc_log2l);
    TLI.setUnavailable(LibFunc_log1p);
    TLI.setUnavailable(LibFunc_log1pf);
    TLI.setUnavailable(LibFunc_log1pl);
    TLI.setUnavailable(LibFunc_logb);
    TLI.setUnavailable(LibFunc_logbf);
    TLI.setUnavailable(LibFunc_logbl);
    TLI.setUnavailable(LibFunc_nearbyint);
    TLI.setUnavailable(LibFunc_nearbyintf);
    TLI.setUnavailable(LibFunc_nearbyintl);
    TLI.setUnavailable(LibFunc_rint);
    TLI.setUnavailable(LibFunc_rintf);
    TLI.setUnavailable(LibFunc_rintl);
    TLI.setUnavailable(LibFunc_round);
    TLI.setUnavailable(LibFunc_roundf);
    TLI.setUnavailable(LibFunc_roundl);
    TLI.setUnavailable(LibFunc_trunc);
    TLI.setUnavailable(LibFunc_truncf);
    TLI.setUnavailable(LibFunc_truncl);

    // Win32 provides some C99 math with mangled names
    TLI.setAvailableWithName(LibFunc_copysign, "_copysign");

    if (T.getArch() == Triple::x86) {
      // Win32 on x86 implements single-precision math functions as macros
      TLI.setUnavailable(LibFunc_acosf);
      TLI.setUnavailable(LibFunc_asinf);
      TLI.setUnavailable(LibFunc_atanf);
      TLI.setUnavailable(LibFunc_atan2f);
      TLI.setUnavailable(LibFunc_ceilf);
      TLI.setUnavailable(LibFunc_copysignf);
      TLI.setUnavailable(LibFunc_cosf);
      TLI.setUnavailable(LibFunc_coshf);
      TLI.setUnavailable(LibFunc_expf);
      TLI.setUnavailable(LibFunc_floorf);
      TLI.setUnavailable(LibFunc_fminf);
      TLI.setUnavailable(LibFunc_fmaxf);
      TLI.setUnavailable(LibFunc_fmodf);
      TLI.setUnavailable(LibFunc_logf);
      TLI.setUnavailable(LibFunc_log10f);
      TLI.setUnavailable(LibFunc_modff);
      TLI.setUnavailable(LibFunc_powf);
      TLI.setUnavailable(LibFunc_sinf);
      TLI.setUnavailable(LibFunc_sinhf);
      TLI.setUnavailable(LibFunc_sqrtf);
      TLI.setUnavailable(LibFunc_tanf);
      TLI.setUnavailable(LibFunc_tanhf);
    }

    // Win32 does *not* provide provide these functions, but they are
    // generally available on POSIX-compliant systems:
    TLI.setUnavailable(LibFunc_access);
    TLI.setUnavailable(LibFunc_bcmp);
    TLI.setUnavailable(LibFunc_bcopy);
    TLI.setUnavailable(LibFunc_bzero);
    TLI.setUnavailable(LibFunc_chmod);
    TLI.setUnavailable(LibFunc_chown);
    TLI.setUnavailable(LibFunc_closedir);
    TLI.setUnavailable(LibFunc_ctermid);
    TLI.setUnavailable(LibFunc_fdopen);
    TLI.setUnavailable(LibFunc_ffs);
    TLI.setUnavailable(LibFunc_fileno);
    TLI.setUnavailable(LibFunc_flockfile);
    TLI.setUnavailable(LibFunc_fseeko);
    TLI.setUnavailable(LibFunc_fstat);
    TLI.setUnavailable(LibFunc_fstatvfs);
    TLI.setUnavailable(LibFunc_ftello);
    TLI.setUnavailable(LibFunc_ftrylockfile);
    TLI.setUnavailable(LibFunc_funlockfile);
    TLI.setUnavailable(LibFunc_getc_unlocked);
    TLI.setUnavailable(LibFunc_getitimer);
    TLI.setUnavailable(LibFunc_getlogin_r);
    TLI.setUnavailable(LibFunc_getpwnam);
    TLI.setUnavailable(LibFunc_gettimeofday);
    TLI.setUnavailable(LibFunc_htonl);
    TLI.setUnavailable(LibFunc_htons);
    TLI.setUnavailable(LibFunc_lchown);
    TLI.setUnavailable(LibFunc_lstat);
    TLI.setUnavailable(LibFunc_memccpy);
    TLI.setUnavailable(LibFunc_mkdir);
    TLI.setUnavailable(LibFunc_ntohl);
    TLI.setUnavailable(LibFunc_ntohs);
    TLI.setUnavailable(LibFunc_open);
    TLI.setUnavailable(LibFunc_opendir);
    TLI.setUnavailable(LibFunc_pclose);
    TLI.setUnavailable(LibFunc_popen);
    TLI.setUnavailable(LibFunc_pread);
    TLI.setUnavailable(LibFunc_pwrite);
    TLI.setUnavailable(LibFunc_read);
    TLI.setUnavailable(LibFunc_readlink);
    TLI.setUnavailable(LibFunc_realpath);
    TLI.setUnavailable(LibFunc_rmdir);
    TLI.setUnavailable(LibFunc_setitimer);
    TLI.setUnavailable(LibFunc_stat);
    TLI.setUnavailable(LibFunc_statvfs);
    TLI.setUnavailable(LibFunc_stpcpy);
    TLI.setUnavailable(LibFunc_stpncpy);
    TLI.setUnavailable(LibFunc_strcasecmp);
    TLI.setUnavailable(LibFunc_strncasecmp);
    TLI.setUnavailable(LibFunc_times);
    TLI.setUnavailable(LibFunc_uname);
    TLI.setUnavailable(LibFunc_unlink);
    TLI.setUnavailable(LibFunc_unsetenv);
    TLI.setUnavailable(LibFunc_utime);
    TLI.setUnavailable(LibFunc_utimes);
    TLI.setUnavailable(LibFunc_write);

    // Win32 does *not* provide provide these functions, but they are
    // specified by C99:
    TLI.setUnavailable(LibFunc_atoll);
    TLI.setUnavailable(LibFunc_frexpf);
    TLI.setUnavailable(LibFunc_llabs);
  }

  switch (T.getOS()) {
  case Triple::MacOSX:
    // exp10 and exp10f are not available on OS X until 10.9 and iOS until 7.0
    // and their names are __exp10 and __exp10f. exp10l is not available on
    // OS X or iOS.
    TLI.setUnavailable(LibFunc_exp10l);
    if (T.isMacOSXVersionLT(10, 9)) {
      TLI.setUnavailable(LibFunc_exp10);
      TLI.setUnavailable(LibFunc_exp10f);
    } else {
      TLI.setAvailableWithName(LibFunc_exp10, "__exp10");
      TLI.setAvailableWithName(LibFunc_exp10f, "__exp10f");
    }
    break;
  case Triple::IOS:
  case Triple::TvOS:
  case Triple::WatchOS:
    TLI.setUnavailable(LibFunc_exp10l);
    if (!T.isWatchOS() && (T.isOSVersionLT(7, 0) ||
                           (T.isOSVersionLT(9, 0) &&
                            (T.getArch() == Triple::x86 ||
                             T.getArch() == Triple::x86_64)))) {
      TLI.setUnavailable(LibFunc_exp10);
      TLI.setUnavailable(LibFunc_exp10f);
    } else {
      TLI.setAvailableWithName(LibFunc_exp10, "__exp10");
      TLI.setAvailableWithName(LibFunc_exp10f, "__exp10f");
    }
    break;
  case Triple::Linux:
    // exp10, exp10f, exp10l is available on Linux (GLIBC) but are extremely
    // buggy prior to glibc version 2.18. Until this version is widely deployed
    // or we have a reasonable detection strategy, we cannot use exp10 reliably
    // on Linux.
    //
    // Fall through to disable all of them.
    LLVM_FALLTHROUGH;
  default:
    TLI.setUnavailable(LibFunc_exp10);
    TLI.setUnavailable(LibFunc_exp10f);
    TLI.setUnavailable(LibFunc_exp10l);
  }

  // ffsl is available on at least Darwin, Mac OS X, iOS, FreeBSD, and
  // Linux (GLIBC):
  // http://developer.apple.com/library/mac/#documentation/Darwin/Reference/ManPages/man3/ffsl.3.html
  // http://svn.freebsd.org/base/head/lib/libc/string/ffsl.c
  // http://www.gnu.org/software/gnulib/manual/html_node/ffsl.html
  switch (T.getOS()) {
  case Triple::Darwin:
  case Triple::MacOSX:
  case Triple::IOS:
  case Triple::TvOS:
  case Triple::WatchOS:
  case Triple::FreeBSD:
  case Triple::Linux:
    break;
  default:
    TLI.setUnavailable(LibFunc_ffsl);
  }

  // ffsll is available on at least FreeBSD and Linux (GLIBC):
  // http://svn.freebsd.org/base/head/lib/libc/string/ffsll.c
  // http://www.gnu.org/software/gnulib/manual/html_node/ffsll.html
  switch (T.getOS()) {
  case Triple::Darwin:
  case Triple::MacOSX:
  case Triple::IOS:
  case Triple::TvOS:
  case Triple::WatchOS:
  case Triple::FreeBSD:
  case Triple::Linux:
    break;
  default:
    TLI.setUnavailable(LibFunc_ffsll);
  }

  // The following functions are available on at least FreeBSD:
  // http://svn.freebsd.org/base/head/lib/libc/string/fls.c
  // http://svn.freebsd.org/base/head/lib/libc/string/flsl.c
  // http://svn.freebsd.org/base/head/lib/libc/string/flsll.c
  if (!T.isOSFreeBSD()) {
    TLI.setUnavailable(LibFunc_fls);
    TLI.setUnavailable(LibFunc_flsl);
    TLI.setUnavailable(LibFunc_flsll);
  }

  // The following functions are available on at least Linux:
  if (!T.isOSLinux()) {
    TLI.setUnavailable(LibFunc_dunder_strdup);
    TLI.setUnavailable(LibFunc_dunder_strtok_r);
    TLI.setUnavailable(LibFunc_dunder_isoc99_scanf);
    TLI.setUnavailable(LibFunc_dunder_isoc99_sscanf);
    TLI.setUnavailable(LibFunc_under_IO_getc);
    TLI.setUnavailable(LibFunc_under_IO_putc);
    TLI.setUnavailable(LibFunc_memalign);
    TLI.setUnavailable(LibFunc_fopen64);
    TLI.setUnavailable(LibFunc_fseeko64);
    TLI.setUnavailable(LibFunc_fstat64);
    TLI.setUnavailable(LibFunc_fstatvfs64);
    TLI.setUnavailable(LibFunc_ftello64);
    TLI.setUnavailable(LibFunc_lstat64);
    TLI.setUnavailable(LibFunc_open64);
    TLI.setUnavailable(LibFunc_stat64);
    TLI.setUnavailable(LibFunc_statvfs64);
    TLI.setUnavailable(LibFunc_tmpfile64);
  }

  // As currently implemented in clang, NVPTX code has no standard library to
  // speak of.  Headers provide a standard-ish library implementation, but many
  // of the signatures are wrong -- for example, many libm functions are not
  // extern "C".
  //
  // libdevice, an IR library provided by nvidia, is linked in by the front-end,
  // but only used functions are provided to llvm.  Moreover, most of the
  // functions in libdevice don't map precisely to standard library functions.
  //
  // FIXME: Having no standard library prevents e.g. many fastmath
  // optimizations, so this situation should be fixed.
  if (T.isNVPTX()) {
    TLI.disableAllFunctions();
    TLI.setAvailable(LibFunc_nvvm_reflect);
  } else {
    TLI.setUnavailable(LibFunc_nvvm_reflect);
  }

  TLI.addVectorizableFunctionsFromVecLib(ClVectorLibrary);
}

TargetLibraryInfoImpl::TargetLibraryInfoImpl() {
  // Default to everything being available.
  memset(AvailableArray, -1, sizeof(AvailableArray));

  initialize(*this, Triple(), StandardNames);
}

TargetLibraryInfoImpl::TargetLibraryInfoImpl(const Triple &T) {
  // Default to everything being available.
  memset(AvailableArray, -1, sizeof(AvailableArray));

  initialize(*this, T, StandardNames);
}

TargetLibraryInfoImpl::TargetLibraryInfoImpl(const TargetLibraryInfoImpl &TLI)
    : CustomNames(TLI.CustomNames), ShouldExtI32Param(TLI.ShouldExtI32Param),
      ShouldExtI32Return(TLI.ShouldExtI32Return),
      ShouldSignExtI32Param(TLI.ShouldSignExtI32Param) {
  memcpy(AvailableArray, TLI.AvailableArray, sizeof(AvailableArray));
  VectorDescs = TLI.VectorDescs;
  ScalarDescs = TLI.ScalarDescs;
}

TargetLibraryInfoImpl::TargetLibraryInfoImpl(TargetLibraryInfoImpl &&TLI)
    : CustomNames(std::move(TLI.CustomNames)),
      ShouldExtI32Param(TLI.ShouldExtI32Param),
      ShouldExtI32Return(TLI.ShouldExtI32Return),
      ShouldSignExtI32Param(TLI.ShouldSignExtI32Param) {
  std::move(std::begin(TLI.AvailableArray), std::end(TLI.AvailableArray),
            AvailableArray);
  VectorDescs = TLI.VectorDescs;
  ScalarDescs = TLI.ScalarDescs;
}

TargetLibraryInfoImpl &TargetLibraryInfoImpl::operator=(const TargetLibraryInfoImpl &TLI) {
  CustomNames = TLI.CustomNames;
  ShouldExtI32Param = TLI.ShouldExtI32Param;
  ShouldExtI32Return = TLI.ShouldExtI32Return;
  ShouldSignExtI32Param = TLI.ShouldSignExtI32Param;
  memcpy(AvailableArray, TLI.AvailableArray, sizeof(AvailableArray));
  return *this;
}

TargetLibraryInfoImpl &TargetLibraryInfoImpl::operator=(TargetLibraryInfoImpl &&TLI) {
  CustomNames = std::move(TLI.CustomNames);
  ShouldExtI32Param = TLI.ShouldExtI32Param;
  ShouldExtI32Return = TLI.ShouldExtI32Return;
  ShouldSignExtI32Param = TLI.ShouldSignExtI32Param;
  std::move(std::begin(TLI.AvailableArray), std::end(TLI.AvailableArray),
            AvailableArray);
  return *this;
}

static StringRef sanitizeFunctionName(StringRef funcName) {
  // Filter out empty names and names containing null bytes, those can't be in
  // our table.
  if (funcName.empty() || funcName.find('\0') != StringRef::npos)
    return StringRef();

  // Check for \01 prefix that is used to mangle __asm declarations and
  // strip it if present.
  return GlobalValue::getRealLinkageName(funcName);
}

bool TargetLibraryInfoImpl::getLibFunc(StringRef funcName,
                                       LibFunc &F) const {
  StringRef const *Start = &StandardNames[0];
  StringRef const *End = &StandardNames[NumLibFuncs];

  funcName = sanitizeFunctionName(funcName);
  if (funcName.empty())
    return false;

  StringRef const *I = std::lower_bound(
      Start, End, funcName, [](StringRef LHS, StringRef RHS) {
        return LHS < RHS;
      });
  if (I != End && *I == funcName) {
    F = (LibFunc)(I - Start);
    return true;
  }
  return false;
}

bool TargetLibraryInfoImpl::isValidProtoForLibFunc(const FunctionType &FTy,
                                                   LibFunc F,
                                                   const DataLayout *DL) const {
  LLVMContext &Ctx = FTy.getContext();
  Type *PCharTy = Type::getInt8PtrTy(Ctx);
  Type *SizeTTy = DL ? DL->getIntPtrType(Ctx, /*AS=*/0) : nullptr;
  auto IsSizeTTy = [SizeTTy](Type *Ty) {
    return SizeTTy ? Ty == SizeTTy : Ty->isIntegerTy();
  };
  unsigned NumParams = FTy.getNumParams();

  switch (F) {
  case LibFunc_strlen:
    return (NumParams == 1 && FTy.getParamType(0)->isPointerTy() &&
            FTy.getReturnType()->isIntegerTy());

  case LibFunc_strchr:
  case LibFunc_strrchr:
    return (NumParams == 2 && FTy.getReturnType()->isPointerTy() &&
            FTy.getParamType(0) == FTy.getReturnType() &&
            FTy.getParamType(1)->isIntegerTy());

  case LibFunc_strtol:
  case LibFunc_strtod:
  case LibFunc_strtof:
  case LibFunc_strtoul:
  case LibFunc_strtoll:
  case LibFunc_strtold:
  case LibFunc_strtoull:
    return ((NumParams == 2 || NumParams == 3) &&
            FTy.getParamType(0)->isPointerTy() &&
            FTy.getParamType(1)->isPointerTy());
  case LibFunc_strcat:
    return (NumParams == 2 && FTy.getReturnType()->isPointerTy() &&
            FTy.getParamType(0) == FTy.getReturnType() &&
            FTy.getParamType(1) == FTy.getReturnType());

  case LibFunc_strncat:
    return (NumParams == 3 && FTy.getReturnType()->isPointerTy() &&
            FTy.getParamType(0) == FTy.getReturnType() &&
            FTy.getParamType(1) == FTy.getReturnType() &&
            FTy.getParamType(2)->isIntegerTy());

  case LibFunc_strcpy_chk:
  case LibFunc_stpcpy_chk:
    --NumParams;
    if (!IsSizeTTy(FTy.getParamType(NumParams)))
      return false;
    LLVM_FALLTHROUGH;
  case LibFunc_strcpy:
  case LibFunc_stpcpy:
    return (NumParams == 2 && FTy.getReturnType() == FTy.getParamType(0) &&
            FTy.getParamType(0) == FTy.getParamType(1) &&
            FTy.getParamType(0) == PCharTy);

  case LibFunc_strncpy_chk:
  case LibFunc_stpncpy_chk:
    --NumParams;
    if (!IsSizeTTy(FTy.getParamType(NumParams)))
      return false;
    LLVM_FALLTHROUGH;
  case LibFunc_strncpy:
  case LibFunc_stpncpy:
    return (NumParams == 3 && FTy.getReturnType() == FTy.getParamType(0) &&
            FTy.getParamType(0) == FTy.getParamType(1) &&
            FTy.getParamType(0) == PCharTy &&
            FTy.getParamType(2)->isIntegerTy());

  case LibFunc_strxfrm:
    return (NumParams == 3 && FTy.getParamType(0)->isPointerTy() &&
            FTy.getParamType(1)->isPointerTy());

  case LibFunc_strcmp:
    return (NumParams == 2 && FTy.getReturnType()->isIntegerTy(32) &&
            FTy.getParamType(0)->isPointerTy() &&
            FTy.getParamType(0) == FTy.getParamType(1));

  case LibFunc_strncmp:
    return (NumParams == 3 && FTy.getReturnType()->isIntegerTy(32) &&
            FTy.getParamType(0)->isPointerTy() &&
            FTy.getParamType(0) == FTy.getParamType(1) &&
            FTy.getParamType(2)->isIntegerTy());

  case LibFunc_strspn:
  case LibFunc_strcspn:
    return (NumParams == 2 && FTy.getParamType(0)->isPointerTy() &&
            FTy.getParamType(0) == FTy.getParamType(1) &&
            FTy.getReturnType()->isIntegerTy());

  case LibFunc_strcoll:
  case LibFunc_strcasecmp:
  case LibFunc_strncasecmp:
    return (NumParams >= 2 && FTy.getParamType(0)->isPointerTy() &&
            FTy.getParamType(1)->isPointerTy());

  case LibFunc_strstr:
    return (NumParams == 2 && FTy.getReturnType()->isPointerTy() &&
            FTy.getParamType(0)->isPointerTy() &&
            FTy.getParamType(1)->isPointerTy());

  case LibFunc_strpbrk:
    return (NumParams == 2 && FTy.getParamType(0)->isPointerTy() &&
            FTy.getReturnType() == FTy.getParamType(0) &&
            FTy.getParamType(0) == FTy.getParamType(1));

  case LibFunc_strtok:
  case LibFunc_strtok_r:
    return (NumParams >= 2 && FTy.getParamType(1)->isPointerTy());
  case LibFunc_scanf:
  case LibFunc_setbuf:
  case LibFunc_setvbuf:
    return (NumParams >= 1 && FTy.getParamType(0)->isPointerTy());
  case LibFunc_strdup:
  case LibFunc_strndup:
    return (NumParams >= 1 && FTy.getReturnType()->isPointerTy() &&
            FTy.getParamType(0)->isPointerTy());
  case LibFunc_sscanf:
  case LibFunc_stat:
  case LibFunc_statvfs:
  case LibFunc_siprintf:
  case LibFunc_sprintf:
    return (NumParams >= 2 && FTy.getParamType(0)->isPointerTy() &&
            FTy.getParamType(1)->isPointerTy());
  case LibFunc_snprintf:
    return (NumParams == 3 && FTy.getParamType(0)->isPointerTy() &&
            FTy.getParamType(2)->isPointerTy());
  case LibFunc_setitimer:
    return (NumParams == 3 && FTy.getParamType(1)->isPointerTy() &&
            FTy.getParamType(2)->isPointerTy());
  case LibFunc_system:
    return (NumParams == 1 && FTy.getParamType(0)->isPointerTy());
  case LibFunc_malloc:
    return (NumParams == 1 && FTy.getReturnType()->isPointerTy());
  case LibFunc_memcmp:
    return (NumParams == 3 && FTy.getReturnType()->isIntegerTy(32) &&
            FTy.getParamType(0)->isPointerTy() &&
            FTy.getParamType(1)->isPointerTy());

  case LibFunc_memchr:
  case LibFunc_memrchr:
    return (NumParams == 3 && FTy.getReturnType()->isPointerTy() &&
            FTy.getReturnType() == FTy.getParamType(0) &&
            FTy.getParamType(1)->isIntegerTy(32) &&
            IsSizeTTy(FTy.getParamType(2)));
  case LibFunc_modf:
  case LibFunc_modff:
  case LibFunc_modfl:
    return (NumParams >= 2 && FTy.getParamType(1)->isPointerTy());

  case LibFunc_memcpy_chk:
  case LibFunc_memmove_chk:
    --NumParams;
    if (!IsSizeTTy(FTy.getParamType(NumParams)))
      return false;
    LLVM_FALLTHROUGH;
  case LibFunc_memcpy:
  case LibFunc_mempcpy:
  case LibFunc_memmove:
    return (NumParams == 3 && FTy.getReturnType() == FTy.getParamType(0) &&
            FTy.getParamType(0)->isPointerTy() &&
            FTy.getParamType(1)->isPointerTy() &&
            IsSizeTTy(FTy.getParamType(2)));

  case LibFunc_memset_chk:
    --NumParams;
    if (!IsSizeTTy(FTy.getParamType(NumParams)))
      return false;
    LLVM_FALLTHROUGH;
  case LibFunc_memset:
    return (NumParams == 3 && FTy.getReturnType() == FTy.getParamType(0) &&
            FTy.getParamType(0)->isPointerTy() &&
            FTy.getParamType(1)->isIntegerTy() &&
            IsSizeTTy(FTy.getParamType(2)));

  case LibFunc_memccpy:
    return (NumParams >= 2 && FTy.getParamType(1)->isPointerTy());
  case LibFunc_memalign:
    return (FTy.getReturnType()->isPointerTy());
  case LibFunc_realloc:
  case LibFunc_reallocf:
    return (NumParams == 2 && FTy.getReturnType() == PCharTy &&
            FTy.getParamType(0) == FTy.getReturnType() &&
            IsSizeTTy(FTy.getParamType(1)));
  case LibFunc_read:
    return (NumParams == 3 && FTy.getParamType(1)->isPointerTy());
  case LibFunc_rewind:
  case LibFunc_rmdir:
  case LibFunc_remove:
  case LibFunc_realpath:
    return (NumParams >= 1 && FTy.getParamType(0)->isPointerTy());
  case LibFunc_rename:
    return (NumParams >= 2 && FTy.getParamType(0)->isPointerTy() &&
            FTy.getParamType(1)->isPointerTy());
  case LibFunc_readlink:
    return (NumParams >= 2 && FTy.getParamType(0)->isPointerTy() &&
            FTy.getParamType(1)->isPointerTy());
  case LibFunc_write:
    return (NumParams == 3 && FTy.getParamType(1)->isPointerTy());
  case LibFunc_bcopy:
  case LibFunc_bcmp:
    return (NumParams == 3 && FTy.getParamType(0)->isPointerTy() &&
            FTy.getParamType(1)->isPointerTy());
  case LibFunc_bzero:
    return (NumParams == 2 && FTy.getParamType(0)->isPointerTy());
  case LibFunc_calloc:
    return (NumParams == 2 && FTy.getReturnType()->isPointerTy());

  case LibFunc_atof:
  case LibFunc_atoi:
  case LibFunc_atol:
  case LibFunc_atoll:
  case LibFunc_ferror:
  case LibFunc_getenv:
  case LibFunc_getpwnam:
  case LibFunc_iprintf:
  case LibFunc_pclose:
  case LibFunc_perror:
  case LibFunc_printf:
  case LibFunc_puts:
  case LibFunc_uname:
  case LibFunc_under_IO_getc:
  case LibFunc_unlink:
  case LibFunc_unsetenv:
    return (NumParams == 1 && FTy.getParamType(0)->isPointerTy());

  case LibFunc_access:
  case LibFunc_chmod:
  case LibFunc_chown:
  case LibFunc_clearerr:
  case LibFunc_closedir:
  case LibFunc_ctermid:
  case LibFunc_fclose:
  case LibFunc_feof:
  case LibFunc_fflush:
  case LibFunc_fgetc:
  case LibFunc_fileno:
  case LibFunc_flockfile:
  case LibFunc_free:
  case LibFunc_fseek:
  case LibFunc_fseeko64:
  case LibFunc_fseeko:
  case LibFunc_fsetpos:
  case LibFunc_ftell:
  case LibFunc_ftello64:
  case LibFunc_ftello:
  case LibFunc_ftrylockfile:
  case LibFunc_funlockfile:
  case LibFunc_getc:
  case LibFunc_getc_unlocked:
  case LibFunc_getlogin_r:
  case LibFunc_mkdir:
  case LibFunc_mktime:
  case LibFunc_times:
    return (NumParams != 0 && FTy.getParamType(0)->isPointerTy());

  case LibFunc_fopen:
    return (NumParams == 2 && FTy.getReturnType()->isPointerTy() &&
            FTy.getParamType(0)->isPointerTy() &&
            FTy.getParamType(1)->isPointerTy());
  case LibFunc_fdopen:
    return (NumParams == 2 && FTy.getReturnType()->isPointerTy() &&
            FTy.getParamType(1)->isPointerTy());
  case LibFunc_fputc:
  case LibFunc_fstat:
  case LibFunc_frexp:
  case LibFunc_frexpf:
  case LibFunc_frexpl:
  case LibFunc_fstatvfs:
    return (NumParams == 2 && FTy.getParamType(1)->isPointerTy());
  case LibFunc_fgets:
    return (NumParams == 3 && FTy.getParamType(0)->isPointerTy() &&
            FTy.getParamType(2)->isPointerTy());
  case LibFunc_fread:
    return (NumParams == 4 && FTy.getParamType(0)->isPointerTy() &&
            FTy.getParamType(3)->isPointerTy());
  case LibFunc_fwrite:
    return (NumParams == 4 && FTy.getReturnType()->isIntegerTy() &&
            FTy.getParamType(0)->isPointerTy() &&
            FTy.getParamType(1)->isIntegerTy() &&
            FTy.getParamType(2)->isIntegerTy() &&
            FTy.getParamType(3)->isPointerTy());
  case LibFunc_fputs:
    return (NumParams >= 2 && FTy.getParamType(0)->isPointerTy() &&
            FTy.getParamType(1)->isPointerTy());
  case LibFunc_fscanf:
  case LibFunc_fiprintf:
  case LibFunc_fprintf:
    return (NumParams >= 2 && FTy.getReturnType()->isIntegerTy() &&
            FTy.getParamType(0)->isPointerTy() &&
            FTy.getParamType(1)->isPointerTy());
  case LibFunc_fgetpos:
    return (NumParams >= 2 && FTy.getParamType(0)->isPointerTy() &&
            FTy.getParamType(1)->isPointerTy());
  case LibFunc_getchar:
    return (NumParams == 0 && FTy.getReturnType()->isIntegerTy());
  case LibFunc_gets:
    return (NumParams == 1 && FTy.getParamType(0) == PCharTy);
  case LibFunc_getitimer:
    return (NumParams == 2 && FTy.getParamType(1)->isPointerTy());
  case LibFunc_ungetc:
    return (NumParams == 2 && FTy.getParamType(1)->isPointerTy());
  case LibFunc_utime:
  case LibFunc_utimes:
    return (NumParams == 2 && FTy.getParamType(0)->isPointerTy() &&
            FTy.getParamType(1)->isPointerTy());
  case LibFunc_putc:
    return (NumParams == 2 && FTy.getParamType(1)->isPointerTy());
  case LibFunc_pread:
  case LibFunc_pwrite:
    return (NumParams == 4 && FTy.getParamType(1)->isPointerTy());
  case LibFunc_popen:
    return (NumParams == 2 && FTy.getReturnType()->isPointerTy() &&
            FTy.getParamType(0)->isPointerTy() &&
            FTy.getParamType(1)->isPointerTy());
  case LibFunc_vscanf:
    return (NumParams == 2 && FTy.getParamType(1)->isPointerTy());
  case LibFunc_vsscanf:
    return (NumParams == 3 && FTy.getParamType(1)->isPointerTy() &&
            FTy.getParamType(2)->isPointerTy());
  case LibFunc_vfscanf:
    return (NumParams == 3 && FTy.getParamType(1)->isPointerTy() &&
            FTy.getParamType(2)->isPointerTy());
  case LibFunc_valloc:
    return (FTy.getReturnType()->isPointerTy());
  case LibFunc_vprintf:
    return (NumParams == 2 && FTy.getParamType(0)->isPointerTy());
  case LibFunc_vfprintf:
  case LibFunc_vsprintf:
    return (NumParams == 3 && FTy.getParamType(0)->isPointerTy() &&
            FTy.getParamType(1)->isPointerTy());
  case LibFunc_vsnprintf:
    return (NumParams == 4 && FTy.getParamType(0)->isPointerTy() &&
            FTy.getParamType(2)->isPointerTy());
  case LibFunc_open:
    return (NumParams >= 2 && FTy.getParamType(0)->isPointerTy());
  case LibFunc_opendir:
    return (NumParams == 1 && FTy.getReturnType()->isPointerTy() &&
            FTy.getParamType(0)->isPointerTy());
  case LibFunc_tmpfile:
    return (FTy.getReturnType()->isPointerTy());
  case LibFunc_htonl:
  case LibFunc_ntohl:
    return (NumParams == 1 && FTy.getReturnType()->isIntegerTy(32) &&
            FTy.getReturnType() == FTy.getParamType(0));
  case LibFunc_htons:
  case LibFunc_ntohs:
    return (NumParams == 1 && FTy.getReturnType()->isIntegerTy(16) &&
            FTy.getReturnType() == FTy.getParamType(0));
  case LibFunc_lstat:
    return (NumParams == 2 && FTy.getParamType(0)->isPointerTy() &&
            FTy.getParamType(1)->isPointerTy());
  case LibFunc_lchown:
    return (NumParams == 3 && FTy.getParamType(0)->isPointerTy());
  case LibFunc_qsort:
    return (NumParams == 4 && FTy.getParamType(3)->isPointerTy());
  case LibFunc_dunder_strdup:
  case LibFunc_dunder_strndup:
    return (NumParams >= 1 && FTy.getReturnType()->isPointerTy() &&
            FTy.getParamType(0)->isPointerTy());
  case LibFunc_dunder_strtok_r:
    return (NumParams == 3 && FTy.getParamType(1)->isPointerTy());
  case LibFunc_under_IO_putc:
    return (NumParams == 2 && FTy.getParamType(1)->isPointerTy());
  case LibFunc_dunder_isoc99_scanf:
    return (NumParams >= 1 && FTy.getParamType(0)->isPointerTy());
  case LibFunc_stat64:
  case LibFunc_lstat64:
  case LibFunc_statvfs64:
    return (NumParams == 2 && FTy.getParamType(0)->isPointerTy() &&
            FTy.getParamType(1)->isPointerTy());
  case LibFunc_dunder_isoc99_sscanf:
    return (NumParams >= 2 && FTy.getParamType(0)->isPointerTy() &&
            FTy.getParamType(1)->isPointerTy());
  case LibFunc_fopen64:
    return (NumParams == 2 && FTy.getReturnType()->isPointerTy() &&
            FTy.getParamType(0)->isPointerTy() &&
            FTy.getParamType(1)->isPointerTy());
  case LibFunc_tmpfile64:
    return (FTy.getReturnType()->isPointerTy());
  case LibFunc_fstat64:
  case LibFunc_fstatvfs64:
    return (NumParams == 2 && FTy.getParamType(1)->isPointerTy());
  case LibFunc_open64:
    return (NumParams >= 2 && FTy.getParamType(0)->isPointerTy());
  case LibFunc_gettimeofday:
    return (NumParams == 2 && FTy.getParamType(0)->isPointerTy() &&
            FTy.getParamType(1)->isPointerTy());

  // new(unsigned int);
  case LibFunc_Znwj:
  // new(unsigned long);
  case LibFunc_Znwm:
  // new[](unsigned int);
  case LibFunc_Znaj:
  // new[](unsigned long);
  case LibFunc_Znam:
  // new(unsigned int);
  case LibFunc_msvc_new_int:
  // new(unsigned long long);
  case LibFunc_msvc_new_longlong:
  // new[](unsigned int);
  case LibFunc_msvc_new_array_int:
  // new[](unsigned long long);
  case LibFunc_msvc_new_array_longlong:
    return (NumParams == 1 && FTy.getReturnType()->isPointerTy());

  // new(unsigned int, nothrow);
  case LibFunc_ZnwjRKSt9nothrow_t:
  // new(unsigned long, nothrow);
  case LibFunc_ZnwmRKSt9nothrow_t:
  // new[](unsigned int, nothrow);
  case LibFunc_ZnajRKSt9nothrow_t:
  // new[](unsigned long, nothrow);
  case LibFunc_ZnamRKSt9nothrow_t:
  // new(unsigned int, nothrow);
  case LibFunc_msvc_new_int_nothrow:
  // new(unsigned long long, nothrow);
  case LibFunc_msvc_new_longlong_nothrow:
  // new[](unsigned int, nothrow);
  case LibFunc_msvc_new_array_int_nothrow:
  // new[](unsigned long long, nothrow);
  case LibFunc_msvc_new_array_longlong_nothrow:
    return (NumParams == 2 && FTy.getReturnType()->isPointerTy());

  // void operator delete[](void*);
  case LibFunc_ZdaPv:
  // void operator delete(void*);
  case LibFunc_ZdlPv:
  // void operator delete[](void*);
  case LibFunc_msvc_delete_array_ptr32:
  // void operator delete[](void*);
  case LibFunc_msvc_delete_array_ptr64:
  // void operator delete(void*);
  case LibFunc_msvc_delete_ptr32:
  // void operator delete(void*);
  case LibFunc_msvc_delete_ptr64:
    return (NumParams == 1 && FTy.getParamType(0)->isPointerTy());

  // void operator delete[](void*, nothrow);
  case LibFunc_ZdaPvRKSt9nothrow_t:
  // void operator delete[](void*, unsigned int);
  case LibFunc_ZdaPvj:
  // void operator delete[](void*, unsigned long);
  case LibFunc_ZdaPvm:
  // void operator delete(void*, nothrow);
  case LibFunc_ZdlPvRKSt9nothrow_t:
  // void operator delete(void*, unsigned int);
  case LibFunc_ZdlPvj:
  // void operator delete(void*, unsigned long);
  case LibFunc_ZdlPvm:
  // void operator delete[](void*, unsigned int);
  case LibFunc_msvc_delete_array_ptr32_int:
  // void operator delete[](void*, nothrow);
  case LibFunc_msvc_delete_array_ptr32_nothrow:
  // void operator delete[](void*, unsigned long long);
  case LibFunc_msvc_delete_array_ptr64_longlong:
  // void operator delete[](void*, nothrow);
  case LibFunc_msvc_delete_array_ptr64_nothrow:
  // void operator delete(void*, unsigned int);
  case LibFunc_msvc_delete_ptr32_int:
  // void operator delete(void*, nothrow);
  case LibFunc_msvc_delete_ptr32_nothrow:
  // void operator delete(void*, unsigned long long);
  case LibFunc_msvc_delete_ptr64_longlong:
  // void operator delete(void*, nothrow);
  case LibFunc_msvc_delete_ptr64_nothrow:
    return (NumParams == 2 && FTy.getParamType(0)->isPointerTy());

  case LibFunc_memset_pattern16:
    return (!FTy.isVarArg() && NumParams == 3 &&
            FTy.getParamType(0)->isPointerTy() &&
            FTy.getParamType(1)->isPointerTy() &&
            FTy.getParamType(2)->isIntegerTy());

  case LibFunc_cxa_guard_abort:
  case LibFunc_cxa_guard_acquire:
  case LibFunc_cxa_guard_release:
  case LibFunc_nvvm_reflect:
    return (NumParams == 1 && FTy.getParamType(0)->isPointerTy());

  case LibFunc_sincospi_stret:
  case LibFunc_sincospif_stret:
    return (NumParams == 1 && FTy.getParamType(0)->isFloatingPointTy());

  case LibFunc_acos:
  case LibFunc_acosf:
  case LibFunc_acosh:
  case LibFunc_acoshf:
  case LibFunc_acoshl:
  case LibFunc_acosl:
  case LibFunc_asin:
  case LibFunc_asinf:
  case LibFunc_asinh:
  case LibFunc_asinhf:
  case LibFunc_asinhl:
  case LibFunc_asinl:
  case LibFunc_atan:
  case LibFunc_atanf:
  case LibFunc_atanh:
  case LibFunc_atanhf:
  case LibFunc_atanhl:
  case LibFunc_atanl:
  case LibFunc_cbrt:
  case LibFunc_cbrtf:
  case LibFunc_cbrtl:
  case LibFunc_ceil:
  case LibFunc_ceilf:
  case LibFunc_ceill:
  case LibFunc_cos:
  case LibFunc_cosf:
  case LibFunc_cosh:
  case LibFunc_coshf:
  case LibFunc_coshl:
  case LibFunc_cosl:
  case LibFunc_exp10:
  case LibFunc_exp10f:
  case LibFunc_exp10l:
  case LibFunc_exp2:
  case LibFunc_exp2f:
  case LibFunc_exp2l:
  case LibFunc_exp:
  case LibFunc_expf:
  case LibFunc_expl:
  case LibFunc_expm1:
  case LibFunc_expm1f:
  case LibFunc_expm1l:
  case LibFunc_fabs:
  case LibFunc_fabsf:
  case LibFunc_fabsl:
  case LibFunc_floor:
  case LibFunc_floorf:
  case LibFunc_floorl:
  case LibFunc_log10:
  case LibFunc_log10f:
  case LibFunc_log10l:
  case LibFunc_log1p:
  case LibFunc_log1pf:
  case LibFunc_log1pl:
  case LibFunc_log2:
  case LibFunc_log2f:
  case LibFunc_log2l:
  case LibFunc_log:
  case LibFunc_logb:
  case LibFunc_logbf:
  case LibFunc_logbl:
  case LibFunc_logf:
  case LibFunc_logl:
  case LibFunc_nearbyint:
  case LibFunc_nearbyintf:
  case LibFunc_nearbyintl:
  case LibFunc_rint:
  case LibFunc_rintf:
  case LibFunc_rintl:
  case LibFunc_round:
  case LibFunc_roundf:
  case LibFunc_roundl:
  case LibFunc_sin:
  case LibFunc_sinf:
  case LibFunc_sinh:
  case LibFunc_sinhf:
  case LibFunc_sinhl:
  case LibFunc_sinl:
  case LibFunc_sqrt:
  case LibFunc_sqrt_finite:
  case LibFunc_sqrtf:
  case LibFunc_sqrtf_finite:
  case LibFunc_sqrtl:
  case LibFunc_sqrtl_finite:
  case LibFunc_tan:
  case LibFunc_tanf:
  case LibFunc_tanh:
  case LibFunc_tanhf:
  case LibFunc_tanhl:
  case LibFunc_tanl:
  case LibFunc_trunc:
  case LibFunc_truncf:
  case LibFunc_truncl:
    return (NumParams == 1 && FTy.getReturnType()->isFloatingPointTy() &&
            FTy.getReturnType() == FTy.getParamType(0));

  case LibFunc_atan2:
  case LibFunc_atan2f:
  case LibFunc_atan2l:
  case LibFunc_fmin:
  case LibFunc_fminf:
  case LibFunc_fminl:
  case LibFunc_fmax:
  case LibFunc_fmaxf:
  case LibFunc_fmaxl:
  case LibFunc_fmod:
  case LibFunc_fmodf:
  case LibFunc_fmodl:
  case LibFunc_copysign:
  case LibFunc_copysignf:
  case LibFunc_copysignl:
  case LibFunc_pow:
  case LibFunc_powf:
  case LibFunc_powl:
    return (NumParams == 2 && FTy.getReturnType()->isFloatingPointTy() &&
            FTy.getReturnType() == FTy.getParamType(0) &&
            FTy.getReturnType() == FTy.getParamType(1));

  case LibFunc_ldexp:
  case LibFunc_ldexpf:
  case LibFunc_ldexpl:
    return (NumParams == 2 && FTy.getReturnType()->isFloatingPointTy() &&
            FTy.getReturnType() == FTy.getParamType(0) &&
            FTy.getParamType(1)->isIntegerTy(32));

  case LibFunc_ffs:
  case LibFunc_ffsl:
  case LibFunc_ffsll:
  case LibFunc_fls:
  case LibFunc_flsl:
  case LibFunc_flsll:
    return (NumParams == 1 && FTy.getReturnType()->isIntegerTy(32) &&
            FTy.getParamType(0)->isIntegerTy());

  case LibFunc_isdigit:
  case LibFunc_isascii:
  case LibFunc_toascii:
  case LibFunc_putchar:
    return (NumParams == 1 && FTy.getReturnType()->isIntegerTy(32) &&
            FTy.getReturnType() == FTy.getParamType(0));

  case LibFunc_abs:
  case LibFunc_labs:
  case LibFunc_llabs:
    return (NumParams == 1 && FTy.getReturnType()->isIntegerTy() &&
            FTy.getReturnType() == FTy.getParamType(0));

  case LibFunc_cxa_atexit:
    return (NumParams == 3 && FTy.getReturnType()->isIntegerTy() &&
            FTy.getParamType(0)->isPointerTy() &&
            FTy.getParamType(1)->isPointerTy() &&
            FTy.getParamType(2)->isPointerTy());

  case LibFunc_sinpi:
  case LibFunc_cospi:
    return (NumParams == 1 && FTy.getReturnType()->isDoubleTy() &&
            FTy.getReturnType() == FTy.getParamType(0));

  case LibFunc_sinpif:
  case LibFunc_cospif:
    return (NumParams == 1 && FTy.getReturnType()->isFloatTy() &&
            FTy.getReturnType() == FTy.getParamType(0));

  case LibFunc_strnlen:
    return (NumParams == 2 && FTy.getReturnType() == FTy.getParamType(1) &&
            FTy.getParamType(0) == PCharTy &&
            FTy.getParamType(1) == SizeTTy);

  case LibFunc_posix_memalign:
    return (NumParams == 3 && FTy.getReturnType()->isIntegerTy(32) &&
            FTy.getParamType(0)->isPointerTy() &&
            FTy.getParamType(1) == SizeTTy && FTy.getParamType(2) == SizeTTy);

  case LibFunc::NumLibFuncs:
    break;
  }

  llvm_unreachable("Invalid libfunc");
}

bool TargetLibraryInfoImpl::getLibFunc(const Function &FDecl,
                                       LibFunc &F) const {
  const DataLayout *DL =
      FDecl.getParent() ? &FDecl.getParent()->getDataLayout() : nullptr;
  return getLibFunc(FDecl.getName(), F) &&
         isValidProtoForLibFunc(*FDecl.getFunctionType(), F, DL);
}

void TargetLibraryInfoImpl::disableAllFunctions() {
  memset(AvailableArray, 0, sizeof(AvailableArray));
}

static bool compareByScalarFnName(const VecDesc &LHS, const VecDesc &RHS) {
  return LHS.ScalarFnName < RHS.ScalarFnName;
}

static bool compareByVectorFnName(const VecDesc &LHS, const VecDesc &RHS) {
  return LHS.VectorFnName < RHS.VectorFnName;
}

static bool compareWithScalarFnName(const VecDesc &LHS, StringRef S) {
  return LHS.ScalarFnName < S;
}

static bool compareWithVectorFnName(const VecDesc &LHS, StringRef S) {
  return LHS.VectorFnName < S;
}

void TargetLibraryInfoImpl::addVectorizableFunctions(ArrayRef<VecDesc> Fns) {
  VectorDescs.insert(VectorDescs.end(), Fns.begin(), Fns.end());
  std::sort(VectorDescs.begin(), VectorDescs.end(), compareByScalarFnName);

  ScalarDescs.insert(ScalarDescs.end(), Fns.begin(), Fns.end());
  std::sort(ScalarDescs.begin(), ScalarDescs.end(), compareByVectorFnName);
}

void TargetLibraryInfoImpl::addVectorizableFunctionsFromVecLib(
    enum VectorLibrary VecLib) {
  switch (VecLib) {
  case Accelerate: {
    const VecDesc VecFuncs[] = {
        // Floating-Point Arithmetic and Auxiliary Functions
        {"ceilf", "vceilf", 4},
        {"fabsf", "vfabsf", 4},
        {"llvm.fabs.f32", "vfabsf", 4},
        {"floorf", "vfloorf", 4},
        {"sqrtf", "vsqrtf", 4},
        {"llvm.sqrt.f32", "vsqrtf", 4},

        // Exponential and Logarithmic Functions
        {"expf", "vexpf", 4},
        {"llvm.exp.f32", "vexpf", 4},
        {"expm1f", "vexpm1f", 4},
        {"logf", "vlogf", 4},
        {"llvm.log.f32", "vlogf", 4},
        {"log1pf", "vlog1pf", 4},
        {"log10f", "vlog10f", 4},
        {"llvm.log10.f32", "vlog10f", 4},
        {"logbf", "vlogbf", 4},

        // Trigonometric Functions
        {"sinf", "vsinf", 4},
        {"llvm.sin.f32", "vsinf", 4},
        {"cosf", "vcosf", 4},
        {"llvm.cos.f32", "vcosf", 4},
        {"tanf", "vtanf", 4},
        {"asinf", "vasinf", 4},
        {"acosf", "vacosf", 4},
        {"atanf", "vatanf", 4},

        // Hyperbolic Functions
        {"sinhf", "vsinhf", 4},
        {"coshf", "vcoshf", 4},
        {"tanhf", "vtanhf", 4},
        {"asinhf", "vasinhf", 4},
        {"acoshf", "vacoshf", 4},
        {"atanhf", "vatanhf", 4},
    };
    addVectorizableFunctions(VecFuncs);
    break;
  }
  case SVML: {
    const VecDesc VecFuncs[] = {
        {"sin", "__svml_sin2", 2},
        {"sin", "__svml_sin4", 4},
        {"sin", "__svml_sin8", 8},

        {"sinf", "__svml_sinf4", 4},
        {"sinf", "__svml_sinf8", 8},
        {"sinf", "__svml_sinf16", 16},

        {"cos", "__svml_cos2", 2},
        {"cos", "__svml_cos4", 4},
        {"cos", "__svml_cos8", 8},

        {"cosf", "__svml_cosf4", 4},
        {"cosf", "__svml_cosf8", 8},
        {"cosf", "__svml_cosf16", 16},

        {"pow", "__svml_pow2", 2},
        {"pow", "__svml_pow4", 4},
        {"pow", "__svml_pow8", 8},

        {"powf", "__svml_powf4", 4},
        {"powf", "__svml_powf8", 8},
        {"powf", "__svml_powf16", 16},

        {"llvm.pow.f64", "__svml_pow2", 2},
        {"llvm.pow.f64", "__svml_pow4", 4},
        {"llvm.pow.f64", "__svml_pow8", 8},

        {"llvm.pow.f32", "__svml_powf4", 4},
        {"llvm.pow.f32", "__svml_powf8", 8},
        {"llvm.pow.f32", "__svml_powf16", 16},

        {"exp", "__svml_exp2", 2},
        {"exp", "__svml_exp4", 4},
        {"exp", "__svml_exp8", 8},

        {"expf", "__svml_expf4", 4},
        {"expf", "__svml_expf8", 8},
        {"expf", "__svml_expf16", 16},

        {"llvm.exp.f64", "__svml_exp2", 2},
        {"llvm.exp.f64", "__svml_exp4", 4},
        {"llvm.exp.f64", "__svml_exp8", 8},

        {"llvm.exp.f32", "__svml_expf4", 4},
        {"llvm.exp.f32", "__svml_expf8", 8},
        {"llvm.exp.f32", "__svml_expf16", 16},

        {"log", "__svml_log2", 2},
        {"log", "__svml_log4", 4},
        {"log", "__svml_log8", 8},

        {"logf", "__svml_logf4", 4},
        {"logf", "__svml_logf8", 8},
        {"logf", "__svml_logf16", 16},

        {"llvm.log.f64", "__svml_log2", 2},
        {"llvm.log.f64", "__svml_log4", 4},
        {"llvm.log.f64", "__svml_log8", 8},

        {"llvm.log.f32", "__svml_logf4", 4},
        {"llvm.log.f32", "__svml_logf8", 8},
        {"llvm.log.f32", "__svml_logf16", 16},
    };
    addVectorizableFunctions(VecFuncs);
    break;
  }
  case NoLibrary:
    break;
  }
}

bool TargetLibraryInfoImpl::isFunctionVectorizable(StringRef funcName) const {
  funcName = sanitizeFunctionName(funcName);
  if (funcName.empty())
    return false;

  std::vector<VecDesc>::const_iterator I = std::lower_bound(
      VectorDescs.begin(), VectorDescs.end(), funcName,
      compareWithScalarFnName);
  return I != VectorDescs.end() && StringRef(I->ScalarFnName) == funcName;
}

StringRef TargetLibraryInfoImpl::getVectorizedFunction(StringRef F,
                                                       unsigned VF) const {
  F = sanitizeFunctionName(F);
  if (F.empty())
    return F;
  std::vector<VecDesc>::const_iterator I = std::lower_bound(
      VectorDescs.begin(), VectorDescs.end(), F, compareWithScalarFnName);
  while (I != VectorDescs.end() && StringRef(I->ScalarFnName) == F) {
    if (I->VectorizationFactor == VF)
      return I->VectorFnName;
    ++I;
  }
  return StringRef();
}

StringRef TargetLibraryInfoImpl::getScalarizedFunction(StringRef F,
                                                       unsigned &VF) const {
  F = sanitizeFunctionName(F);
  if (F.empty())
    return F;

  std::vector<VecDesc>::const_iterator I = std::lower_bound(
      ScalarDescs.begin(), ScalarDescs.end(), F, compareWithVectorFnName);
  if (I == VectorDescs.end() || StringRef(I->VectorFnName) != F)
    return StringRef();
  VF = I->VectorizationFactor;
  return I->ScalarFnName;
}

TargetLibraryInfo TargetLibraryAnalysis::run(Module &M,
                                             ModuleAnalysisManager &) {
  if (PresetInfoImpl)
    return TargetLibraryInfo(*PresetInfoImpl);

  return TargetLibraryInfo(lookupInfoImpl(Triple(M.getTargetTriple())));
}

TargetLibraryInfo TargetLibraryAnalysis::run(Function &F,
                                             FunctionAnalysisManager &) {
  if (PresetInfoImpl)
    return TargetLibraryInfo(*PresetInfoImpl);

  return TargetLibraryInfo(
      lookupInfoImpl(Triple(F.getParent()->getTargetTriple())));
}

TargetLibraryInfoImpl &TargetLibraryAnalysis::lookupInfoImpl(const Triple &T) {
  std::unique_ptr<TargetLibraryInfoImpl> &Impl =
      Impls[T.normalize()];
  if (!Impl)
    Impl.reset(new TargetLibraryInfoImpl(T));

  return *Impl;
}


TargetLibraryInfoWrapperPass::TargetLibraryInfoWrapperPass()
    : ImmutablePass(ID), TLIImpl(), TLI(TLIImpl) {
  initializeTargetLibraryInfoWrapperPassPass(*PassRegistry::getPassRegistry());
}

TargetLibraryInfoWrapperPass::TargetLibraryInfoWrapperPass(const Triple &T)
    : ImmutablePass(ID), TLIImpl(T), TLI(TLIImpl) {
  initializeTargetLibraryInfoWrapperPassPass(*PassRegistry::getPassRegistry());
}

TargetLibraryInfoWrapperPass::TargetLibraryInfoWrapperPass(
    const TargetLibraryInfoImpl &TLIImpl)
    : ImmutablePass(ID), TLIImpl(TLIImpl), TLI(this->TLIImpl) {
  initializeTargetLibraryInfoWrapperPassPass(*PassRegistry::getPassRegistry());
}

AnalysisKey TargetLibraryAnalysis::Key;

// Register the basic pass.
INITIALIZE_PASS(TargetLibraryInfoWrapperPass, "targetlibinfo",
                "Target Library Information", false, true)
char TargetLibraryInfoWrapperPass::ID = 0;

void TargetLibraryInfoWrapperPass::anchor() {}