mirror of
https://github.com/gcc-mirror/gcc.git
synced 2026-05-06 14:59:39 +02:00
68a1218c18
This patch extends libstdc++ to implement C++26's atomic fetch min/max operations. The __atomic_fetch_minmaxable concept checks if __atomic_fetch_min and __atomic_fetch_max builtins are implemented by the compiler. If not, fall back to a CAS loop. This patch was bootstrapped and regtested on aarch64-linux-gnu and x86_64-linux-gnu, no regression. Signed-off-by: Soumya AR <soumyaa@nvidia.com> libstdc++-v3/ChangeLog: * include/bits/atomic_base.h: Add fetch_min and fetch_max memberfunctions. * include/bits/version.def: Add __cpp_lib_atomic_min_max feature test macro. * include/bits/version.h (defined): Regenerate. * include/std/atomic: Extend for fetch_min/max non-member functions. * src/c++23/std.cc.in: Export atomic_fetch_min, atomic_fetch_max, atomic_fetch_min_explicit, atomic_fetch_max_explicit. * testsuite/29_atomics/atomic_integral/nonmembers_fetch_minmax.cc: New test. * testsuite/29_atomics/atomic_ref/integral_fetch_minmax.cc: New test.
This directory contains the GNU Compiler Collection (GCC). The GNU Compiler Collection is free software. See the files whose names start with COPYING for copying permission. The manuals, and some of the runtime libraries, are under different terms; see the individual source files for details. The directory INSTALL contains copies of the installation information as HTML and plain text. The source of this information is gcc/doc/install.texi. The installation information includes details of what is included in the GCC sources and what files GCC installs. See the file gcc/doc/gcc.texi (together with other files that it includes) for usage and porting information. An online readable version of the manual is in the files gcc/doc/gcc.info*. See http://gcc.gnu.org/bugs/ for how to report bugs usefully. Copyright years on GCC source files may be listed using range notation, e.g., 1987-2012, indicating that every year in the range, inclusive, is a copyrightable year that could otherwise be listed individually.