1 files changed, 45 insertions, 0 deletions
diff --git a/llvm/lib/IR/RuntimeLibcalls.cpp b/llvm/lib/IR/RuntimeLibcalls.cpp
index b1864897..5936ac7 100644
--- a/llvm/lib/IR/RuntimeLibcalls.cpp
+++ b/llvm/lib/IR/RuntimeLibcalls.cpp
@@ -135,6 +135,51 @@ void RuntimeLibcallsInfo::initLibcalls(const Triple &TT,
   }
 }
 
+RTLIB::LibcallImpl
+RuntimeLibcallsInfo::getSupportedLibcallImpl(StringRef FuncName) const {
+  const ArrayRef<uint16_t> RuntimeLibcallNameOffsets(
+      RuntimeLibcallNameOffsetTable);
+
+  iterator_range<ArrayRef<uint16_t>::const_iterator> Range =
+      getRecognizedLibcallImpls(FuncName);
+
+  for (auto I = Range.begin(); I != Range.end(); ++I) {
+    RTLIB::LibcallImpl Impl =
+        static_cast<RTLIB::LibcallImpl>(I - RuntimeLibcallNameOffsets.begin());
+
+    // FIXME: This should not depend on looking up ImplToLibcall, only the list
+    // of libcalls for the module.
+    RTLIB::LibcallImpl Recognized = LibcallImpls[ImplToLibcall[Impl]];
+    if (Recognized != RTLIB::Unsupported)
+      return Recognized;
+  }
+
+  return RTLIB::Unsupported;
+}
+
+iterator_range<ArrayRef<uint16_t>::const_iterator>
+RuntimeLibcallsInfo::getRecognizedLibcallImpls(StringRef FuncName) {
+  StringTable::Iterator It = lower_bound(RuntimeLibcallImplNameTable, FuncName);
+  if (It == RuntimeLibcallImplNameTable.end() || *It != FuncName)
+    return iterator_range(ArrayRef<uint16_t>());
+
+  uint16_t IndexVal = It.offset().value();
+  const ArrayRef<uint16_t> TableRef(RuntimeLibcallNameOffsetTable);
+
+  ArrayRef<uint16_t>::const_iterator E = TableRef.end();
+  ArrayRef<uint16_t>::const_iterator EntriesBegin =
+      std::lower_bound(TableRef.begin(), E, IndexVal);
+  ArrayRef<uint16_t>::const_iterator EntriesEnd = EntriesBegin;
+
+  while (EntriesEnd != E && *EntriesEnd == IndexVal)
+    ++EntriesEnd;
+
+  assert(EntriesBegin != E &&
+         "libcall found in name table but not offset table");
+
+  return make_range(EntriesBegin, EntriesEnd);
+}
+
 bool RuntimeLibcallsInfo::darwinHasExp10(const Triple &TT) {
   switch (TT.getOS()) {
   case Triple::MacOSX: