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      1 //===-- TargetLibraryInfo.cpp - Runtime library information ----------------==//
      2 //
      3 //                     The LLVM Compiler Infrastructure
      4 //
      5 // This file is distributed under the University of Illinois Open Source
      6 // License. See LICENSE.TXT for details.
      7 //
      8 //===----------------------------------------------------------------------===//
      9 //
     10 // This file implements the TargetLibraryInfo class.
     11 //
     12 //===----------------------------------------------------------------------===//
     13 
     14 #include "llvm/Analysis/TargetLibraryInfo.h"
     15 #include "llvm/ADT/Triple.h"
     16 #include "llvm/Support/CommandLine.h"
     17 using namespace llvm;
     18 
     19 static cl::opt<TargetLibraryInfoImpl::VectorLibrary> ClVectorLibrary(
     20     "vector-library", cl::Hidden, cl::desc("Vector functions library"),
     21     cl::init(TargetLibraryInfoImpl::NoLibrary),
     22     cl::values(clEnumValN(TargetLibraryInfoImpl::NoLibrary, "none",
     23                           "No vector functions library"),
     24                clEnumValN(TargetLibraryInfoImpl::Accelerate, "Accelerate",
     25                           "Accelerate framework"),
     26                clEnumValEnd));
     27 
     28 const char *const TargetLibraryInfoImpl::StandardNames[LibFunc::NumLibFuncs] = {
     29 #define TLI_DEFINE_STRING
     30 #include "llvm/Analysis/TargetLibraryInfo.def"
     31 };
     32 
     33 static bool hasSinCosPiStret(const Triple &T) {
     34   // Only Darwin variants have _stret versions of combined trig functions.
     35   if (!T.isOSDarwin())
     36     return false;
     37 
     38   // The ABI is rather complicated on x86, so don't do anything special there.
     39   if (T.getArch() == Triple::x86)
     40     return false;
     41 
     42   if (T.isMacOSX() && T.isMacOSXVersionLT(10, 9))
     43     return false;
     44 
     45   if (T.isiOS() && T.isOSVersionLT(7, 0))
     46     return false;
     47 
     48   return true;
     49 }
     50 
     51 /// initialize - Initialize the set of available library functions based on the
     52 /// specified target triple.  This should be carefully written so that a missing
     53 /// target triple gets a sane set of defaults.
     54 static void initialize(TargetLibraryInfoImpl &TLI, const Triple &T,
     55                        const char *const *StandardNames) {
     56 #ifndef NDEBUG
     57   // Verify that the StandardNames array is in alphabetical order.
     58   for (unsigned F = 1; F < LibFunc::NumLibFuncs; ++F) {
     59     if (strcmp(StandardNames[F-1], StandardNames[F]) >= 0)
     60       llvm_unreachable("TargetLibraryInfoImpl function names must be sorted");
     61   }
     62 #endif // !NDEBUG
     63 
     64   // There are no library implementations of mempcy and memset for AMD gpus and
     65   // these can be difficult to lower in the backend.
     66   if (T.getArch() == Triple::r600 ||
     67       T.getArch() == Triple::amdgcn) {
     68     TLI.setUnavailable(LibFunc::memcpy);
     69     TLI.setUnavailable(LibFunc::memset);
     70     TLI.setUnavailable(LibFunc::memset_pattern16);
     71     return;
     72   }
     73 
     74   // memset_pattern16 is only available on iOS 3.0 and Mac OS X 10.5 and later.
     75   if (T.isMacOSX()) {
     76     if (T.isMacOSXVersionLT(10, 5))
     77       TLI.setUnavailable(LibFunc::memset_pattern16);
     78   } else if (T.isiOS()) {
     79     if (T.isOSVersionLT(3, 0))
     80       TLI.setUnavailable(LibFunc::memset_pattern16);
     81   } else {
     82     TLI.setUnavailable(LibFunc::memset_pattern16);
     83   }
     84 
     85   if (!hasSinCosPiStret(T)) {
     86     TLI.setUnavailable(LibFunc::sinpi);
     87     TLI.setUnavailable(LibFunc::sinpif);
     88     TLI.setUnavailable(LibFunc::cospi);
     89     TLI.setUnavailable(LibFunc::cospif);
     90     TLI.setUnavailable(LibFunc::sincospi_stret);
     91     TLI.setUnavailable(LibFunc::sincospif_stret);
     92   }
     93 
     94   if (T.isMacOSX() && T.getArch() == Triple::x86 &&
     95       !T.isMacOSXVersionLT(10, 7)) {
     96     // x86-32 OSX has a scheme where fwrite and fputs (and some other functions
     97     // we don't care about) have two versions; on recent OSX, the one we want
     98     // has a $UNIX2003 suffix. The two implementations are identical except
     99     // for the return value in some edge cases.  However, we don't want to
    100     // generate code that depends on the old symbols.
    101     TLI.setAvailableWithName(LibFunc::fwrite, "fwrite$UNIX2003");
    102     TLI.setAvailableWithName(LibFunc::fputs, "fputs$UNIX2003");
    103   }
    104 
    105   // iprintf and friends are only available on XCore and TCE.
    106   if (T.getArch() != Triple::xcore && T.getArch() != Triple::tce) {
    107     TLI.setUnavailable(LibFunc::iprintf);
    108     TLI.setUnavailable(LibFunc::siprintf);
    109     TLI.setUnavailable(LibFunc::fiprintf);
    110   }
    111 
    112   if (T.isOSWindows() && !T.isOSCygMing()) {
    113     // Win32 does not support long double
    114     TLI.setUnavailable(LibFunc::acosl);
    115     TLI.setUnavailable(LibFunc::asinl);
    116     TLI.setUnavailable(LibFunc::atanl);
    117     TLI.setUnavailable(LibFunc::atan2l);
    118     TLI.setUnavailable(LibFunc::ceill);
    119     TLI.setUnavailable(LibFunc::copysignl);
    120     TLI.setUnavailable(LibFunc::cosl);
    121     TLI.setUnavailable(LibFunc::coshl);
    122     TLI.setUnavailable(LibFunc::expl);
    123     TLI.setUnavailable(LibFunc::fabsf); // Win32 and Win64 both lack fabsf
    124     TLI.setUnavailable(LibFunc::fabsl);
    125     TLI.setUnavailable(LibFunc::floorl);
    126     TLI.setUnavailable(LibFunc::fmaxl);
    127     TLI.setUnavailable(LibFunc::fminl);
    128     TLI.setUnavailable(LibFunc::fmodl);
    129     TLI.setUnavailable(LibFunc::frexpl);
    130     TLI.setUnavailable(LibFunc::ldexpf);
    131     TLI.setUnavailable(LibFunc::ldexpl);
    132     TLI.setUnavailable(LibFunc::logl);
    133     TLI.setUnavailable(LibFunc::modfl);
    134     TLI.setUnavailable(LibFunc::powl);
    135     TLI.setUnavailable(LibFunc::sinl);
    136     TLI.setUnavailable(LibFunc::sinhl);
    137     TLI.setUnavailable(LibFunc::sqrtl);
    138     TLI.setUnavailable(LibFunc::tanl);
    139     TLI.setUnavailable(LibFunc::tanhl);
    140 
    141     // Win32 only has C89 math
    142     TLI.setUnavailable(LibFunc::acosh);
    143     TLI.setUnavailable(LibFunc::acoshf);
    144     TLI.setUnavailable(LibFunc::acoshl);
    145     TLI.setUnavailable(LibFunc::asinh);
    146     TLI.setUnavailable(LibFunc::asinhf);
    147     TLI.setUnavailable(LibFunc::asinhl);
    148     TLI.setUnavailable(LibFunc::atanh);
    149     TLI.setUnavailable(LibFunc::atanhf);
    150     TLI.setUnavailable(LibFunc::atanhl);
    151     TLI.setUnavailable(LibFunc::cbrt);
    152     TLI.setUnavailable(LibFunc::cbrtf);
    153     TLI.setUnavailable(LibFunc::cbrtl);
    154     TLI.setUnavailable(LibFunc::exp2);
    155     TLI.setUnavailable(LibFunc::exp2f);
    156     TLI.setUnavailable(LibFunc::exp2l);
    157     TLI.setUnavailable(LibFunc::expm1);
    158     TLI.setUnavailable(LibFunc::expm1f);
    159     TLI.setUnavailable(LibFunc::expm1l);
    160     TLI.setUnavailable(LibFunc::log2);
    161     TLI.setUnavailable(LibFunc::log2f);
    162     TLI.setUnavailable(LibFunc::log2l);
    163     TLI.setUnavailable(LibFunc::log1p);
    164     TLI.setUnavailable(LibFunc::log1pf);
    165     TLI.setUnavailable(LibFunc::log1pl);
    166     TLI.setUnavailable(LibFunc::logb);
    167     TLI.setUnavailable(LibFunc::logbf);
    168     TLI.setUnavailable(LibFunc::logbl);
    169     TLI.setUnavailable(LibFunc::nearbyint);
    170     TLI.setUnavailable(LibFunc::nearbyintf);
    171     TLI.setUnavailable(LibFunc::nearbyintl);
    172     TLI.setUnavailable(LibFunc::rint);
    173     TLI.setUnavailable(LibFunc::rintf);
    174     TLI.setUnavailable(LibFunc::rintl);
    175     TLI.setUnavailable(LibFunc::round);
    176     TLI.setUnavailable(LibFunc::roundf);
    177     TLI.setUnavailable(LibFunc::roundl);
    178     TLI.setUnavailable(LibFunc::trunc);
    179     TLI.setUnavailable(LibFunc::truncf);
    180     TLI.setUnavailable(LibFunc::truncl);
    181 
    182     // Win32 provides some C99 math with mangled names
    183     TLI.setAvailableWithName(LibFunc::copysign, "_copysign");
    184 
    185     if (T.getArch() == Triple::x86) {
    186       // Win32 on x86 implements single-precision math functions as macros
    187       TLI.setUnavailable(LibFunc::acosf);
    188       TLI.setUnavailable(LibFunc::asinf);
    189       TLI.setUnavailable(LibFunc::atanf);
    190       TLI.setUnavailable(LibFunc::atan2f);
    191       TLI.setUnavailable(LibFunc::ceilf);
    192       TLI.setUnavailable(LibFunc::copysignf);
    193       TLI.setUnavailable(LibFunc::cosf);
    194       TLI.setUnavailable(LibFunc::coshf);
    195       TLI.setUnavailable(LibFunc::expf);
    196       TLI.setUnavailable(LibFunc::floorf);
    197       TLI.setUnavailable(LibFunc::fminf);
    198       TLI.setUnavailable(LibFunc::fmaxf);
    199       TLI.setUnavailable(LibFunc::fmodf);
    200       TLI.setUnavailable(LibFunc::logf);
    201       TLI.setUnavailable(LibFunc::powf);
    202       TLI.setUnavailable(LibFunc::sinf);
    203       TLI.setUnavailable(LibFunc::sinhf);
    204       TLI.setUnavailable(LibFunc::sqrtf);
    205       TLI.setUnavailable(LibFunc::tanf);
    206       TLI.setUnavailable(LibFunc::tanhf);
    207     }
    208 
    209     // Win32 does *not* provide provide these functions, but they are
    210     // generally available on POSIX-compliant systems:
    211     TLI.setUnavailable(LibFunc::access);
    212     TLI.setUnavailable(LibFunc::bcmp);
    213     TLI.setUnavailable(LibFunc::bcopy);
    214     TLI.setUnavailable(LibFunc::bzero);
    215     TLI.setUnavailable(LibFunc::chmod);
    216     TLI.setUnavailable(LibFunc::chown);
    217     TLI.setUnavailable(LibFunc::closedir);
    218     TLI.setUnavailable(LibFunc::ctermid);
    219     TLI.setUnavailable(LibFunc::fdopen);
    220     TLI.setUnavailable(LibFunc::ffs);
    221     TLI.setUnavailable(LibFunc::fileno);
    222     TLI.setUnavailable(LibFunc::flockfile);
    223     TLI.setUnavailable(LibFunc::fseeko);
    224     TLI.setUnavailable(LibFunc::fstat);
    225     TLI.setUnavailable(LibFunc::fstatvfs);
    226     TLI.setUnavailable(LibFunc::ftello);
    227     TLI.setUnavailable(LibFunc::ftrylockfile);
    228     TLI.setUnavailable(LibFunc::funlockfile);
    229     TLI.setUnavailable(LibFunc::getc_unlocked);
    230     TLI.setUnavailable(LibFunc::getitimer);
    231     TLI.setUnavailable(LibFunc::getlogin_r);
    232     TLI.setUnavailable(LibFunc::getpwnam);
    233     TLI.setUnavailable(LibFunc::gettimeofday);
    234     TLI.setUnavailable(LibFunc::htonl);
    235     TLI.setUnavailable(LibFunc::htons);
    236     TLI.setUnavailable(LibFunc::lchown);
    237     TLI.setUnavailable(LibFunc::lstat);
    238     TLI.setUnavailable(LibFunc::memccpy);
    239     TLI.setUnavailable(LibFunc::mkdir);
    240     TLI.setUnavailable(LibFunc::ntohl);
    241     TLI.setUnavailable(LibFunc::ntohs);
    242     TLI.setUnavailable(LibFunc::open);
    243     TLI.setUnavailable(LibFunc::opendir);
    244     TLI.setUnavailable(LibFunc::pclose);
    245     TLI.setUnavailable(LibFunc::popen);
    246     TLI.setUnavailable(LibFunc::pread);
    247     TLI.setUnavailable(LibFunc::pwrite);
    248     TLI.setUnavailable(LibFunc::read);
    249     TLI.setUnavailable(LibFunc::readlink);
    250     TLI.setUnavailable(LibFunc::realpath);
    251     TLI.setUnavailable(LibFunc::rmdir);
    252     TLI.setUnavailable(LibFunc::setitimer);
    253     TLI.setUnavailable(LibFunc::stat);
    254     TLI.setUnavailable(LibFunc::statvfs);
    255     TLI.setUnavailable(LibFunc::stpcpy);
    256     TLI.setUnavailable(LibFunc::stpncpy);
    257     TLI.setUnavailable(LibFunc::strcasecmp);
    258     TLI.setUnavailable(LibFunc::strncasecmp);
    259     TLI.setUnavailable(LibFunc::times);
    260     TLI.setUnavailable(LibFunc::uname);
    261     TLI.setUnavailable(LibFunc::unlink);
    262     TLI.setUnavailable(LibFunc::unsetenv);
    263     TLI.setUnavailable(LibFunc::utime);
    264     TLI.setUnavailable(LibFunc::utimes);
    265     TLI.setUnavailable(LibFunc::write);
    266 
    267     // Win32 does *not* provide provide these functions, but they are
    268     // specified by C99:
    269     TLI.setUnavailable(LibFunc::atoll);
    270     TLI.setUnavailable(LibFunc::frexpf);
    271     TLI.setUnavailable(LibFunc::llabs);
    272   }
    273 
    274   switch (T.getOS()) {
    275   case Triple::MacOSX:
    276     // exp10 and exp10f are not available on OS X until 10.9 and iOS until 7.0
    277     // and their names are __exp10 and __exp10f. exp10l is not available on
    278     // OS X or iOS.
    279     TLI.setUnavailable(LibFunc::exp10l);
    280     if (T.isMacOSXVersionLT(10, 9)) {
    281       TLI.setUnavailable(LibFunc::exp10);
    282       TLI.setUnavailable(LibFunc::exp10f);
    283     } else {
    284       TLI.setAvailableWithName(LibFunc::exp10, "__exp10");
    285       TLI.setAvailableWithName(LibFunc::exp10f, "__exp10f");
    286     }
    287     break;
    288   case Triple::IOS:
    289     TLI.setUnavailable(LibFunc::exp10l);
    290     if (T.isOSVersionLT(7, 0)) {
    291       TLI.setUnavailable(LibFunc::exp10);
    292       TLI.setUnavailable(LibFunc::exp10f);
    293     } else {
    294       TLI.setAvailableWithName(LibFunc::exp10, "__exp10");
    295       TLI.setAvailableWithName(LibFunc::exp10f, "__exp10f");
    296     }
    297     break;
    298   case Triple::Linux:
    299     // exp10, exp10f, exp10l is available on Linux (GLIBC) but are extremely
    300     // buggy prior to glibc version 2.18. Until this version is widely deployed
    301     // or we have a reasonable detection strategy, we cannot use exp10 reliably
    302     // on Linux.
    303     //
    304     // Fall through to disable all of them.
    305   default:
    306     TLI.setUnavailable(LibFunc::exp10);
    307     TLI.setUnavailable(LibFunc::exp10f);
    308     TLI.setUnavailable(LibFunc::exp10l);
    309   }
    310 
    311   // ffsl is available on at least Darwin, Mac OS X, iOS, FreeBSD, and
    312   // Linux (GLIBC):
    313   // http://developer.apple.com/library/mac/#documentation/Darwin/Reference/ManPages/man3/ffsl.3.html
    314   // http://svn.freebsd.org/base/user/eri/pf45/head/lib/libc/string/ffsl.c
    315   // http://www.gnu.org/software/gnulib/manual/html_node/ffsl.html
    316   switch (T.getOS()) {
    317   case Triple::Darwin:
    318   case Triple::MacOSX:
    319   case Triple::IOS:
    320   case Triple::FreeBSD:
    321   case Triple::Linux:
    322     break;
    323   default:
    324     TLI.setUnavailable(LibFunc::ffsl);
    325   }
    326 
    327   // ffsll is available on at least FreeBSD and Linux (GLIBC):
    328   // http://svn.freebsd.org/base/user/eri/pf45/head/lib/libc/string/ffsll.c
    329   // http://www.gnu.org/software/gnulib/manual/html_node/ffsll.html
    330   switch (T.getOS()) {
    331   case Triple::FreeBSD:
    332   case Triple::Linux:
    333     break;
    334   default:
    335     TLI.setUnavailable(LibFunc::ffsll);
    336   }
    337 
    338   // The following functions are available on at least Linux:
    339   if (!T.isOSLinux()) {
    340     TLI.setUnavailable(LibFunc::dunder_strdup);
    341     TLI.setUnavailable(LibFunc::dunder_strtok_r);
    342     TLI.setUnavailable(LibFunc::dunder_isoc99_scanf);
    343     TLI.setUnavailable(LibFunc::dunder_isoc99_sscanf);
    344     TLI.setUnavailable(LibFunc::under_IO_getc);
    345     TLI.setUnavailable(LibFunc::under_IO_putc);
    346     TLI.setUnavailable(LibFunc::memalign);
    347     TLI.setUnavailable(LibFunc::fopen64);
    348     TLI.setUnavailable(LibFunc::fseeko64);
    349     TLI.setUnavailable(LibFunc::fstat64);
    350     TLI.setUnavailable(LibFunc::fstatvfs64);
    351     TLI.setUnavailable(LibFunc::ftello64);
    352     TLI.setUnavailable(LibFunc::lstat64);
    353     TLI.setUnavailable(LibFunc::open64);
    354     TLI.setUnavailable(LibFunc::stat64);
    355     TLI.setUnavailable(LibFunc::statvfs64);
    356     TLI.setUnavailable(LibFunc::tmpfile64);
    357   }
    358 
    359   TLI.addVectorizableFunctionsFromVecLib(ClVectorLibrary);
    360 }
    361 
    362 TargetLibraryInfoImpl::TargetLibraryInfoImpl() {
    363   // Default to everything being available.
    364   memset(AvailableArray, -1, sizeof(AvailableArray));
    365 
    366   initialize(*this, Triple(), StandardNames);
    367 }
    368 
    369 TargetLibraryInfoImpl::TargetLibraryInfoImpl(const Triple &T) {
    370   // Default to everything being available.
    371   memset(AvailableArray, -1, sizeof(AvailableArray));
    372 
    373   initialize(*this, T, StandardNames);
    374 }
    375 
    376 TargetLibraryInfoImpl::TargetLibraryInfoImpl(const TargetLibraryInfoImpl &TLI)
    377     : CustomNames(TLI.CustomNames) {
    378   memcpy(AvailableArray, TLI.AvailableArray, sizeof(AvailableArray));
    379   VectorDescs = TLI.VectorDescs;
    380   ScalarDescs = TLI.ScalarDescs;
    381 }
    382 
    383 TargetLibraryInfoImpl::TargetLibraryInfoImpl(TargetLibraryInfoImpl &&TLI)
    384     : CustomNames(std::move(TLI.CustomNames)) {
    385   std::move(std::begin(TLI.AvailableArray), std::end(TLI.AvailableArray),
    386             AvailableArray);
    387   VectorDescs = TLI.VectorDescs;
    388   ScalarDescs = TLI.ScalarDescs;
    389 }
    390 
    391 TargetLibraryInfoImpl &TargetLibraryInfoImpl::operator=(const TargetLibraryInfoImpl &TLI) {
    392   CustomNames = TLI.CustomNames;
    393   memcpy(AvailableArray, TLI.AvailableArray, sizeof(AvailableArray));
    394   return *this;
    395 }
    396 
    397 TargetLibraryInfoImpl &TargetLibraryInfoImpl::operator=(TargetLibraryInfoImpl &&TLI) {
    398   CustomNames = std::move(TLI.CustomNames);
    399   std::move(std::begin(TLI.AvailableArray), std::end(TLI.AvailableArray),
    400             AvailableArray);
    401   return *this;
    402 }
    403 
    404 static StringRef sanitizeFunctionName(StringRef funcName) {
    405   // Filter out empty names and names containing null bytes, those can't be in
    406   // our table.
    407   if (funcName.empty() || funcName.find('\0') != StringRef::npos)
    408     return StringRef();
    409 
    410   // Check for \01 prefix that is used to mangle __asm declarations and
    411   // strip it if present.
    412   return GlobalValue::getRealLinkageName(funcName);
    413 }
    414 
    415 bool TargetLibraryInfoImpl::getLibFunc(StringRef funcName,
    416                                    LibFunc::Func &F) const {
    417   const char *const *Start = &StandardNames[0];
    418   const char *const *End = &StandardNames[LibFunc::NumLibFuncs];
    419 
    420   funcName = sanitizeFunctionName(funcName);
    421   if (funcName.empty())
    422     return false;
    423 
    424   const char *const *I = std::lower_bound(
    425       Start, End, funcName, [](const char *LHS, StringRef RHS) {
    426         return std::strncmp(LHS, RHS.data(), RHS.size()) < 0;
    427       });
    428   if (I != End && *I == funcName) {
    429     F = (LibFunc::Func)(I - Start);
    430     return true;
    431   }
    432   return false;
    433 }
    434 
    435 void TargetLibraryInfoImpl::disableAllFunctions() {
    436   memset(AvailableArray, 0, sizeof(AvailableArray));
    437 }
    438 
    439 static bool compareByScalarFnName(const VecDesc &LHS, const VecDesc &RHS) {
    440   return std::strncmp(LHS.ScalarFnName, RHS.ScalarFnName,
    441                       std::strlen(RHS.ScalarFnName)) < 0;
    442 }
    443 
    444 static bool compareByVectorFnName(const VecDesc &LHS, const VecDesc &RHS) {
    445   return std::strncmp(LHS.VectorFnName, RHS.VectorFnName,
    446                       std::strlen(RHS.VectorFnName)) < 0;
    447 }
    448 
    449 static bool compareWithScalarFnName(const VecDesc &LHS, StringRef S) {
    450   return std::strncmp(LHS.ScalarFnName, S.data(), S.size()) < 0;
    451 }
    452 
    453 static bool compareWithVectorFnName(const VecDesc &LHS, StringRef S) {
    454   return std::strncmp(LHS.VectorFnName, S.data(), S.size()) < 0;
    455 }
    456 
    457 void TargetLibraryInfoImpl::addVectorizableFunctions(ArrayRef<VecDesc> Fns) {
    458   VectorDescs.insert(VectorDescs.end(), Fns.begin(), Fns.end());
    459   std::sort(VectorDescs.begin(), VectorDescs.end(), compareByScalarFnName);
    460 
    461   ScalarDescs.insert(ScalarDescs.end(), Fns.begin(), Fns.end());
    462   std::sort(ScalarDescs.begin(), ScalarDescs.end(), compareByVectorFnName);
    463 }
    464 
    465 void TargetLibraryInfoImpl::addVectorizableFunctionsFromVecLib(
    466     enum VectorLibrary VecLib) {
    467   switch (VecLib) {
    468   case Accelerate: {
    469     const VecDesc VecFuncs[] = {
    470         {"expf", "vexpf", 4},
    471         {"llvm.exp.f32", "vexpf", 4},
    472         {"logf", "vlogf", 4},
    473         {"llvm.log.f32", "vlogf", 4},
    474         {"sqrtf", "vsqrtf", 4},
    475         {"llvm.sqrt.f32", "vsqrtf", 4},
    476         {"fabsf", "vfabsf", 4},
    477         {"llvm.fabs.f32", "vfabsf", 4},
    478     };
    479     addVectorizableFunctions(VecFuncs);
    480     break;
    481   }
    482   case NoLibrary:
    483     break;
    484   }
    485 }
    486 
    487 bool TargetLibraryInfoImpl::isFunctionVectorizable(StringRef funcName) const {
    488   funcName = sanitizeFunctionName(funcName);
    489   if (funcName.empty())
    490     return false;
    491 
    492   std::vector<VecDesc>::const_iterator I = std::lower_bound(
    493       VectorDescs.begin(), VectorDescs.end(), funcName,
    494       compareWithScalarFnName);
    495   return I != VectorDescs.end() && StringRef(I->ScalarFnName) == funcName;
    496 }
    497 
    498 StringRef TargetLibraryInfoImpl::getVectorizedFunction(StringRef F,
    499                                                        unsigned VF) const {
    500   F = sanitizeFunctionName(F);
    501   if (F.empty())
    502     return F;
    503   std::vector<VecDesc>::const_iterator I = std::lower_bound(
    504       VectorDescs.begin(), VectorDescs.end(), F, compareWithScalarFnName);
    505   while (I != VectorDescs.end() && StringRef(I->ScalarFnName) == F) {
    506     if (I->VectorizationFactor == VF)
    507       return I->VectorFnName;
    508     ++I;
    509   }
    510   return StringRef();
    511 }
    512 
    513 StringRef TargetLibraryInfoImpl::getScalarizedFunction(StringRef F,
    514                                                        unsigned &VF) const {
    515   F = sanitizeFunctionName(F);
    516   if (F.empty())
    517     return F;
    518 
    519   std::vector<VecDesc>::const_iterator I = std::lower_bound(
    520       ScalarDescs.begin(), ScalarDescs.end(), F, compareWithVectorFnName);
    521   if (I == VectorDescs.end() || StringRef(I->VectorFnName) != F)
    522     return StringRef();
    523   VF = I->VectorizationFactor;
    524   return I->ScalarFnName;
    525 }
    526 
    527 TargetLibraryInfo TargetLibraryAnalysis::run(Module &M) {
    528   if (PresetInfoImpl)
    529     return TargetLibraryInfo(*PresetInfoImpl);
    530 
    531   return TargetLibraryInfo(lookupInfoImpl(Triple(M.getTargetTriple())));
    532 }
    533 
    534 TargetLibraryInfo TargetLibraryAnalysis::run(Function &F) {
    535   if (PresetInfoImpl)
    536     return TargetLibraryInfo(*PresetInfoImpl);
    537 
    538   return TargetLibraryInfo(
    539       lookupInfoImpl(Triple(F.getParent()->getTargetTriple())));
    540 }
    541 
    542 TargetLibraryInfoImpl &TargetLibraryAnalysis::lookupInfoImpl(Triple T) {
    543   std::unique_ptr<TargetLibraryInfoImpl> &Impl =
    544       Impls[T.normalize()];
    545   if (!Impl)
    546     Impl.reset(new TargetLibraryInfoImpl(T));
    547 
    548   return *Impl;
    549 }
    550 
    551 
    552 TargetLibraryInfoWrapperPass::TargetLibraryInfoWrapperPass()
    553     : ImmutablePass(ID), TLIImpl(), TLI(TLIImpl) {
    554   initializeTargetLibraryInfoWrapperPassPass(*PassRegistry::getPassRegistry());
    555 }
    556 
    557 TargetLibraryInfoWrapperPass::TargetLibraryInfoWrapperPass(const Triple &T)
    558     : ImmutablePass(ID), TLIImpl(T), TLI(TLIImpl) {
    559   initializeTargetLibraryInfoWrapperPassPass(*PassRegistry::getPassRegistry());
    560 }
    561 
    562 TargetLibraryInfoWrapperPass::TargetLibraryInfoWrapperPass(
    563     const TargetLibraryInfoImpl &TLIImpl)
    564     : ImmutablePass(ID), TLIImpl(TLIImpl), TLI(this->TLIImpl) {
    565   initializeTargetLibraryInfoWrapperPassPass(*PassRegistry::getPassRegistry());
    566 }
    567 
    568 char TargetLibraryAnalysis::PassID;
    569 
    570 // Register the basic pass.
    571 INITIALIZE_PASS(TargetLibraryInfoWrapperPass, "targetlibinfo",
    572                 "Target Library Information", false, true)
    573 char TargetLibraryInfoWrapperPass::ID = 0;
    574 
    575 void TargetLibraryInfoWrapperPass::anchor() {}
    576