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author | Patrick Palka <ppalka@redhat.com> | 2020-09-28 11:55:04 -0400 |
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committer | Patrick Palka <ppalka@redhat.com> | 2020-09-28 11:55:04 -0400 |
commit | 620db4ca608987ed3e386fad2fd80fa3886e8154 (patch) | |
tree | 3fae948a6c4b248dc46969b1b327a99c8ceaa996 | |
parent | 623443357e6092067b4cf98cc6c0aeff7560b98d (diff) | |
download | gcc-620db4ca608987ed3e386fad2fd80fa3886e8154.zip gcc-620db4ca608987ed3e386fad2fd80fa3886e8154.tar.gz gcc-620db4ca608987ed3e386fad2fd80fa3886e8154.tar.bz2 |
libstdc++: Reduce the size of a subrange with empty sentinel type
libstdc++-v3/ChangeLog:
* include/bits/ranges_util.h (subrange::_M_end): Give it
[[no_unique_address]].
* testsuite/std/ranges/subrange/sizeof.cc: New test.
-rw-r--r-- | libstdc++-v3/include/bits/ranges_util.h | 2 | ||||
-rw-r--r-- | libstdc++-v3/testsuite/std/ranges/subrange/sizeof.cc | 28 |
2 files changed, 29 insertions, 1 deletions
diff --git a/libstdc++-v3/include/bits/ranges_util.h b/libstdc++-v3/include/bits/ranges_util.h index 694ae796..a98658f 100644 --- a/libstdc++-v3/include/bits/ranges_util.h +++ b/libstdc++-v3/include/bits/ranges_util.h @@ -208,7 +208,7 @@ namespace ranges = _Kind == subrange_kind::sized && !sized_sentinel_for<_Sent, _It>; _It _M_begin = _It(); - _Sent _M_end = _Sent(); + [[no_unique_address]] _Sent _M_end = _Sent(); template<typename, bool = _S_store_size> struct _Size diff --git a/libstdc++-v3/testsuite/std/ranges/subrange/sizeof.cc b/libstdc++-v3/testsuite/std/ranges/subrange/sizeof.cc new file mode 100644 index 0000000..7e95e19 --- /dev/null +++ b/libstdc++-v3/testsuite/std/ranges/subrange/sizeof.cc @@ -0,0 +1,28 @@ +// Copyright (C) 2020 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 <iterator> +#include <ranges> + +// Verify we optimize away the 'end' data member of a subrange with an empty +// sentinel type. +static_assert(sizeof(std::ranges::subrange<std::counted_iterator<int*>, + std::default_sentinel_t>) + == sizeof(std::counted_iterator<int*>)); |