1 files changed, 119 insertions, 0 deletions
diff --git a/libstdc++-v3/testsuite/26_numerics/bit/bitops.rot/rotr.cc b/libstdc++-v3/testsuite/26_numerics/bit/bitops.rot/rotr.cc
new file mode 100644
index 00000000000..c4a17689f79
--- /dev/null
+++ b/libstdc++-v3/testsuite/26_numerics/bit/bitops.rot/rotr.cc
@@ -0,0 +1,119 @@
+// Copyright (C) 2018 Free Software Foundation, Inc.
+//
+// This file is part of the GNU ISO C++ Library.  This library is free
+// software; you can redistribute it and/or modify it under the
+// terms of the GNU General Public License as published by the
+// Free Software Foundation; either version 3, or (at your option)
+// any later version.
+
+// This library is distributed in the hope that it will be useful,
+// but WITHOUT ANY WARRANTY; without even the implied warranty of
+// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+// GNU General Public License for more details.
+
+// You should have received a copy of the GNU General Public License along
+// with this library; see the file COPYING3.  If not see
+// <http://www.gnu.org/licenses/>.
+
+// { dg-options "-std=gnu++2a" }
+// { dg-do compile { target c++2a } }
+
+#include <bit>
+
+template<typename UInt>
+constexpr auto
+test(UInt x)
+-> decltype(std::rotr(x, 0u))
+{
+  static_assert( noexcept(std::rotr(x, 0u)) );
+
+  constexpr unsigned digits = std::numeric_limits<UInt>::digits;
+
+  static_assert( std::rotr((UInt)0, 0) == 0 );
+  static_assert( std::rotr((UInt)0, 1) == 0 );
+  static_assert( std::rotr((UInt)0, 4) == 0 );
+  static_assert( std::rotr((UInt)0, 8) == 0 );
+  static_assert( std::rotr((UInt)-1, 0) == (UInt)-1 );
+  static_assert( std::rotr((UInt)-1, 1) == (UInt)-1 );
+  static_assert( std::rotr((UInt)-1, 4) == (UInt)-1 );
+  static_assert( std::rotr((UInt)-1, 8) == (UInt)-1 );
+
+  static_assert( std::rotr((UInt)128, 0) == (UInt)128 >> 0 );
+  static_assert( std::rotr((UInt)128, 1) == (UInt)128 >> 1 );
+  static_assert( std::rotr((UInt)128, 4) == (UInt)128 >> 4 );
+  static_assert( std::rotr((UInt)1, digits) == (UInt)1 );
+  static_assert( std::rotr((UInt)7, digits) == (UInt)7 );
+  static_assert( std::rotr((UInt)6, digits - 1) == (UInt)12 );
+  static_assert( std::rotr((UInt)36, digits - 2) == (UInt)144 );
+
+  static_assert( std::rotr((UInt)0b0110'1100, 1) == 0b0011'0110 );
+  static_assert( std::rotr((UInt)0b0110'1100, digits - 1) == 0b1101'1000 );
+
+  static_assert( std::rotr((UInt)0x01, 0 ) == 0x01 );
+  static_assert( std::rotr((UInt)0x10, 0 ) == 0x10 );
+  static_assert( std::rotr((UInt)0x10, 1 ) == 0x08 );
+  static_assert( std::rotr((UInt)0x10, 2 ) == 0x04 );
+  static_assert( std::rotr((UInt)0x10, 3 ) == 0x02 );
+  static_assert( std::rotr((UInt)0x11, digits - 1 ) == 0x22 );
+  static_assert( std::rotr((UInt)0x11, digits - 2 ) == 0x44 );
+
+  if constexpr (std::numeric_limits<UInt>::digits > 8)
+  {
+    static_assert( std::rotr((UInt)0b0011'0111, 3)
+			      == (0b0110 | ((UInt)0b0111 << digits - 3)) );
+    static_assert( std::rotr((UInt)0b1010'0101, 4)
+			      == (0b1010 | ((UInt)0b0101 << digits - 4)) );
+  }
+
+  return true;
+}
+
+static_assert( test( (unsigned char)0 ) );
+static_assert( test( (unsigned short)0 ) );
+static_assert( test( (unsigned int)0 ) );
+static_assert( test( (unsigned long)0 ) );
+static_assert( test( (unsigned long long)0 ) );
+
+// std::rotr(T) shall not participate in overload resolution
+// unless T is an unsigned integer type.
+struct X { constexpr bool did_not_match() { return true; } };
+constexpr X test(...) { return X{}; }
+static_assert( test( (bool)0 ).did_not_match() );
+static_assert( test( (char)0 ).did_not_match() );
+static_assert( test( (int)0 ).did_not_match() );
+static_assert( test( (char16_t)0 ).did_not_match() );
+static_assert( test( (float)0 ).did_not_match() );
+static_assert( test( (void*)0 ).did_not_match() );
+static_assert( test( X{} ).did_not_match() );
+enum E : unsigned { e };
+static_assert( test( e ).did_not_match() );
+
+#ifndef __STRICT_ANSI__
+#include <cstddef>
+static_assert( std::rotr(std::byte{0}, 4) == std::byte{0} );
+static_assert( std::rotr(std::byte{0x01}, 4) == std::byte{0x10} );
+static_assert( std::rotr(std::byte{0x02}, 3) == std::byte{0x40} );
+static_assert( std::rotr(std::byte{0x03}, 2) == std::byte{0xc0} );
+static_assert( std::rotr(std::byte{0x30}, 2) == std::byte{0x0c} );
+static_assert( std::rotr(std::byte{0x40}, 1) == std::byte{0x20} );
+static_assert( std::rotr(std::byte{0x41}, 9) == std::byte{0xa0} );
+#else
+static_assert( test( (std::byte)0 ).did_not_match() );
+#endif
+
+#if !defined(__STRICT_ANSI__) && defined _GLIBCXX_USE_INT128
+static_assert( test( (unsigned __int128)0 ) );
+static_assert( test( (__int128)0 ).did_not_match() );
+#endif
+#if defined(__GLIBCXX_TYPE_INT_N_0)
+static_assert( test( (unsigned __GLIBCXX_TYPE_INT_N_0)0 ) );
+static_assert( test( (__GLIBCXX_TYPE_INT_N_0)0 ).did_not_match() );
+#endif
+#if defined(__GLIBCXX_TYPE_INT_N_1)
+static_assert( test( (unsigned __GLIBCXX_TYPE_INT_N_1)0 ) );
+static_assert( test( (__GLIBCXX_TYPE_INT_N_1)0 ).did_not_match() );
+#endif
+#if defined(__GLIBCXX_TYPE_INT_N_2)
+static_assert( test( (unsigned __GLIBCXX_TYPE_INT_N_2)0 ) );
+static_assert( test( (__GLIBCXX_TYPE_INT_N_2)0 ).did_not_match() );
+#endif