1 files changed, 12 insertions, 0 deletions
diff --git a/compiler-rt/lib/orc/stl_extras.h b/compiler-rt/lib/orc/stl_extras.h
index 33c877b..80a6cd1 100644
--- a/compiler-rt/lib/orc/stl_extras.h
+++ b/compiler-rt/lib/orc/stl_extras.h
@@ -13,6 +13,7 @@
 #ifndef ORC_RT_STL_EXTRAS_H
 #define ORC_RT_STL_EXTRAS_H
 
+#include <cstdint>
 #include <utility>
 #include <tuple>
 
@@ -28,6 +29,17 @@ template <class Ty> struct identity {
   const Ty &operator()(const Ty &self) const { return self; }
 };
 
+/// Substitute for std::bit_ceil.
+constexpr uint64_t bit_ceil(uint64_t Val) noexcept {
+  Val |= (Val >> 1);
+  Val |= (Val >> 2);
+  Val |= (Val >> 4);
+  Val |= (Val >> 8);
+  Val |= (Val >> 16);
+  Val |= (Val >> 32);
+  return Val + 1;
+}
+
 } // namespace __orc_rt
 
 #endif // ORC_RT_STL_EXTRAS