5ad64d76c0
The armv9.4-a architectural revision adds three new atomic operations associated with the LSE128 feature: * LDCLRP - Atomic AND NOT (bitclear) of a location with 128-bit value held in a pair of registers, with original data loaded into the same 2 registers. * LDSETP - Atomic OR (bitset) of a location with 128-bit value held in a pair of registers, with original data loaded into the same 2 registers. * SWPP - Atomic swap of one 128-bit value with 128-bit value held in a pair of registers. It is worth noting that in keeping with existing 128-bit atomic operations in `atomic_16.S', we have chosen to merge certain less-restrictive orderings into more restrictive ones. This is done to minimize the number of branches in the atomic functions, minimizing both the likelihood of branch mispredictions and, in keeping code small, limit the need for extra fetch cycles. Past benchmarking has revealed that acquire is typically slightly faster than release (5-10%), such that for the most frequently used atomics (CAS and SWP) it makes sense to add support for acquire, as well as release. Likewise, it was identified that combining acquire and release typically results in little to no penalty, such that it is of negligible benefit to distinguish between release and acquire-release, making the combining release/acq_rel/seq_cst a worthwhile design choice. This patch adds the logic required to make use of these when the architectural feature is present and a suitable assembler available. In order to do this, the following changes are made: 1. Add a configure-time check to check for LSE128 support in the assembler. 2. Edit host-config.h so that when N == 16, nifunc = 2. 3. Where available due to LSE128, implement the second ifunc, making use of the novel instructions. 4. For atomic functions unable to make use of these new instructions, define a new alias which causes the _i1 function variant to point ahead to the corresponding _i2 implementation. libatomic/ChangeLog: * Makefile.am (AM_CPPFLAGS): add conditional setting of -DHAVE_FEAT_LSE128. * acinclude.m4 (LIBAT_TEST_FEAT_AARCH64_LSE128): New. * config/linux/aarch64/atomic_16.S (LSE128): New macro definition. (libat_exchange_16): New LSE128 variant. (libat_fetch_or_16): Likewise. (libat_or_fetch_16): Likewise. (libat_fetch_and_16): Likewise. (libat_and_fetch_16): Likewise. * config/linux/aarch64/host-config.h (IFUNC_COND_2): New. (IFUNC_NCOND): Add operand size checking. (has_lse2): Renamed from `ifunc1`. (has_lse128): New. (HWCAP2_LSE128): Likewise. * configure.ac: Add call to LIBAT_TEST_FEAT_AARCH64_LSE128. * configure (ac_subst_vars): Regenerated via autoreconf. * Makefile.in: Likewise. * auto-config.h.in: Likewise.
314 lines
10 KiB
Text
314 lines
10 KiB
Text
# Process this file with autoreconf to produce a configure script.
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# Copyright (C) 2012-2024 Free Software Foundation, Inc.
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#
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# This file is part of the GNU Atomic Library (libatomic).
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#
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# Libatomic is free software; you can redistribute it and/or modify it
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# under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 3 of the License, or
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# (at your option) any later version.
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#
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# Libatomic is distributed in the hope that it will be useful, but WITHOUT ANY
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# WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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# FOR A PARTICULAR PURPOSE. See the GNU General Public License for
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# more details.
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#
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# Under Section 7 of GPL version 3, you are granted additional
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# permissions described in the GCC Runtime Library Exception, version
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# 3.1, as published by the Free Software Foundation.
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#
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# You should have received a copy of the GNU General Public License and
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# a copy of the GCC Runtime Library Exception along with this program;
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# see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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# <http://www.gnu.org/licenses/>.
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AC_INIT([GNU Atomic Library], 1.0,,[libatomic])
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AC_CONFIG_HEADER(auto-config.h)
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# -------
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# Options
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# -------
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AC_MSG_CHECKING([for --enable-version-specific-runtime-libs])
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LIBAT_ENABLE(version-specific-runtime-libs, no, ,
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[Specify that runtime libraries should be installed in a compiler-specific directory],
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permit yes|no)
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AC_MSG_RESULT($enable_version_specific_runtime_libs)
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# We would like our source tree to be readonly. However when releases or
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# pre-releases are generated, the flex/bison generated files as well as the
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# various formats of manuals need to be included along with the rest of the
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# sources. Therefore we have --enable-generated-files-in-srcdir to do
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# just that.
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AC_MSG_CHECKING([for --enable-generated-files-in-srcdir])
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LIBAT_ENABLE(generated-files-in-srcdir, no, ,
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[put copies of generated files in source dir intended for creating source
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tarballs for users without texinfo bison or flex.],
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permit yes|no)
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AC_MSG_RESULT($enable_generated_files_in_srcdir)
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AM_CONDITIONAL(GENINSRC, test "$enable_generated_files_in_srcdir" = yes)
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# -------
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# Gets build, host, target, *_vendor, *_cpu, *_os, etc.
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#
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# You will slowly go insane if you do not grok the following fact: when
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# building this library, the top-level /target/ becomes the library's /host/.
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#
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# configure then causes --target to default to --host, exactly like any
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# other package using autoconf. Therefore, 'target' and 'host' will
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# always be the same. This makes sense both for native and cross compilers
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# just think about it for a little while. :-)
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#
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# Also, if this library is being configured as part of a cross compiler, the
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# top-level configure script will pass the "real" host as $with_cross_host.
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#
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# Do not delete or change the following two lines. For why, see
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# http://gcc.gnu.org/ml/libstdc++/2003-07/msg00451.html
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AC_CANONICAL_SYSTEM
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target_alias=${target_alias-$host_alias}
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# Sets up automake. Must come after AC_CANONICAL_SYSTEM. Each of the
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# following is magically included in AUTOMAKE_OPTIONS in each Makefile.am.
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# 1.9.0: minimum required version
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# no-define: PACKAGE and VERSION will not be #define'd in config.h (a bunch
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# of other PACKAGE_* variables will, however, and there's nothing
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# we can do about that; they come from AC_INIT).
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# no-dist: we don't want 'dist' and related rules.
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# foreign: we don't follow the normal rules for GNU packages (no COPYING
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# file in the top srcdir, etc, etc), so stop complaining.
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# -Wall: turns on all automake warnings...
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# -Wno-portability: ...except this one, since GNU make is required.
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# -Wno-override: ... and this one, since we do want this in testsuite.
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AM_INIT_AUTOMAKE([1.9.0 foreign no-dist -Wall -Wno-portability -Wno-override])
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AM_ENABLE_MULTILIB(, ..)
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GCC_WITH_TOOLEXECLIBDIR
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# Calculate toolexeclibdir
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# Also toolexecdir, though it's only used in toolexeclibdir
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case ${enable_version_specific_runtime_libs} in
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yes)
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# Need the gcc compiler version to know where to install libraries
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# and header files if --enable-version-specific-runtime-libs option
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# is selected.
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toolexecdir='$(libdir)/gcc/$(target_alias)'
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toolexeclibdir='$(toolexecdir)/$(gcc_version)$(MULTISUBDIR)'
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;;
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no)
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if test -n "$with_cross_host" &&
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test x"$with_cross_host" != x"no"; then
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# Install a library built with a cross compiler in tooldir, not libdir.
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toolexecdir='$(exec_prefix)/$(target_alias)'
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case ${with_toolexeclibdir} in
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no)
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toolexeclibdir='$(toolexecdir)/lib'
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;;
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*)
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toolexeclibdir=${with_toolexeclibdir}
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;;
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esac
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else
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toolexecdir='$(libdir)/gcc-lib/$(target_alias)'
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toolexeclibdir='$(libdir)'
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fi
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multi_os_directory=`$CC -print-multi-os-directory`
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case $multi_os_directory in
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.) ;; # Avoid trailing /.
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*) toolexeclibdir=$toolexeclibdir/$multi_os_directory ;;
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esac
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;;
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esac
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AC_SUBST(toolexecdir)
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AC_SUBST(toolexeclibdir)
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# Check the compiler.
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# The same as in boehm-gc and libstdc++. Have to borrow it from there.
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# We must force CC to /not/ be precious variables; otherwise
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# the wrong, non-multilib-adjusted value will be used in multilibs.
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# As a side effect, we have to subst CFLAGS ourselves.
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m4_rename([_AC_ARG_VAR_PRECIOUS],[real_PRECIOUS])
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m4_define([_AC_ARG_VAR_PRECIOUS],[])
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AC_PROG_CC
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AM_PROG_AS
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m4_rename_force([real_PRECIOUS],[_AC_ARG_VAR_PRECIOUS])
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AC_SUBST(CFLAGS)
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# In order to override CFLAGS_FOR_TARGET, all of our special flags go
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# in XCFLAGS. But we need them in CFLAGS during configury. So put them
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# in both places for now and restore CFLAGS at the end of config.
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save_CFLAGS="$CFLAGS"
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# Find other programs we need.
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AC_CHECK_TOOL(AR, ar)
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AC_CHECK_TOOL(NM, nm)
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AC_CHECK_TOOL(RANLIB, ranlib, ranlib-not-found-in-path-error)
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AC_PROG_INSTALL
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# Configure libtool
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AM_PROG_LIBTOOL
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ACX_LT_HOST_FLAGS
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AC_SUBST(enable_shared)
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AC_SUBST(enable_static)
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AM_MAINTAINER_MODE
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AM_CONDITIONAL([ENABLE_DARWIN_AT_RPATH], [test x$enable_darwin_at_rpath = xyes])
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# For libtool versioning info, format is CURRENT:REVISION:AGE
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libtool_VERSION=3:0:2
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AC_SUBST(libtool_VERSION)
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# Check for used threading-model
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AC_MSG_CHECKING([for thread model used by GCC])
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target_thread_file=`$CC -v 2>&1 | sed -n 's/^Thread model: //p'`
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AC_MSG_RESULT([$target_thread_file])
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case "$target" in
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*aarch64*)
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ACX_PROG_CC_WARNING_OPTS([-march=armv8-a+lse],[enable_aarch64_lse])
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;;
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esac
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AC_SUBST(SYSROOT_CFLAGS_FOR_TARGET)
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# Get target configury.
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. ${srcdir}/configure.tgt
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if test -n "$UNSUPPORTED"; then
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AC_MSG_ERROR([Configuration ${target} is unsupported.])
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fi
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# Write out the ifunc resolver arg type.
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AC_DEFINE_UNQUOTED(IFUNC_RESOLVER_ARGS, $IFUNC_RESOLVER_ARGS,
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[Define ifunc resolver function argument.])
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# Disable fallbacks to __sync routines from libgcc. Otherwise we'll
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# make silly decisions about what the cpu can do.
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CFLAGS="$save_CFLAGS -fno-sync-libcalls $XCFLAGS"
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# Check header files.
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AC_STDC_HEADERS
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ACX_HEADER_STRING
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GCC_HEADER_STDINT(gstdint.h)
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AC_CHECK_HEADERS([fenv.h])
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# Check for common type sizes
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LIBAT_FORALL_MODES([LIBAT_HAVE_INT_MODE])
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# Check for compiler builtins of atomic operations.
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LIBAT_TEST_ATOMIC_INIT
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LIBAT_FORALL_MODES([LIBAT_HAVE_ATOMIC_LOADSTORE])
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LIBAT_FORALL_MODES([LIBAT_HAVE_ATOMIC_TAS])
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LIBAT_FORALL_MODES([LIBAT_HAVE_ATOMIC_EXCHANGE])
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LIBAT_FORALL_MODES([LIBAT_HAVE_ATOMIC_CAS])
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LIBAT_FORALL_MODES([LIBAT_HAVE_ATOMIC_FETCH_ADD])
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LIBAT_FORALL_MODES([LIBAT_HAVE_ATOMIC_FETCH_OP])
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# Check for target-specific assembly-level support for atomic operations.
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LIBAT_TEST_FEAT_AARCH64_LSE128()
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AC_C_BIGENDIAN
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# I don't like the default behaviour of WORDS_BIGENDIAN undefined for LE.
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AH_BOTTOM(
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[#ifndef WORDS_BIGENDIAN
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#define WORDS_BIGENDIAN 0
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#endif])
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LIBAT_WORDSIZE
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# Check to see if -pthread or -lpthread is needed. Prefer the former.
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# In case the pthread.h system header is not found, this test will fail.
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case " $config_path " in
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*" posix "*)
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XPCFLAGS=""
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CFLAGS="$CFLAGS -pthread"
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AC_LINK_IFELSE(
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[AC_LANG_PROGRAM(
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[#include <pthread.h>
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void *g(void *d) { return NULL; }],
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[pthread_t t; pthread_create(&t,NULL,g,NULL);])],
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[XPCFLAGS=" -pthread"],
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[CFLAGS="$save_CFLAGS $XCFLAGS" LIBS="-lpthread $LIBS"
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AC_LINK_IFELSE(
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[AC_LANG_PROGRAM(
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[#include <pthread.h>
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void *g(void *d) { return NULL; }],
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[pthread_t t; pthread_create(&t,NULL,g,NULL);])],
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[],
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[AC_MSG_ERROR([Pthreads are required to build libatomic])])])
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CFLAGS="$save_CFLAGS $XPCFLAGS"
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;;
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esac
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# See what sort of export controls are available.
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LIBAT_CHECK_ATTRIBUTE_VISIBILITY
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LIBAT_CHECK_ATTRIBUTE_DLLEXPORT
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LIBAT_CHECK_ATTRIBUTE_ALIAS
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if test x$try_ifunc = xyes; then
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LIBAT_CHECK_IFUNC
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fi
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# Check linker support.
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LIBAT_ENABLE_SYMVERS
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# Cleanup and exit.
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CFLAGS="$save_CFLAGS"
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AC_CACHE_SAVE
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AC_ARG_ENABLE([werror],
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[AS_HELP_STRING([--disable-werror], [disable building with -Werror])])
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# Add -Wall -Werror if we are using GCC.
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AS_IF([test "x$GCC" = "xyes"],
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[XCFLAGS="$XCFLAGS -Wall"])
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AS_IF([test "x$enable_werror" != "xno" && test "x$GCC" = "xyes"],
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[XCFLAGS="$XCFLAGS -Werror"])
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# Add CET specific flags if CET is enabled
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GCC_CET_FLAGS(CET_FLAGS)
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XCFLAGS="$XCFLAGS $CET_FLAGS"
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XCFLAGS="$XCFLAGS $XPCFLAGS"
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AC_SUBST(config_path)
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AC_SUBST(XCFLAGS)
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AC_SUBST(XLDFLAGS)
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AC_SUBST(LIBS)
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AC_SUBST(SIZES)
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# Conditionalize the makefile for this target machine.
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tmake_file_=
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for f in ${tmake_file}
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do
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if test -f ${srcdir}/config/$f
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then
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tmake_file_="${tmake_file_} \$(srcdir)/config/$f"
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fi
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done
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tmake_file="${tmake_file_}"
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AC_SUBST(tmake_file)
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AM_CONDITIONAL(HAVE_IFUNC, test x$libat_cv_have_ifunc = xyes)
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AM_CONDITIONAL(ARCH_AARCH64_LINUX,
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[expr "$config_path" : ".* linux/aarch64 .*" > /dev/null])
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AM_CONDITIONAL(ARCH_ARM_LINUX,
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[expr "$config_path" : ".* linux/arm .*" > /dev/null])
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AM_CONDITIONAL(ARCH_I386,
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[test "$ARCH" = x86 && test x$libat_cv_wordsize = x4])
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AM_CONDITIONAL(ARCH_X86_64,
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[test "$ARCH" = x86 && test x$libat_cv_wordsize = x8])
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# Determine what GCC version number to use in filesystem paths.
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GCC_BASE_VER
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if test ${multilib} = yes; then
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multilib_arg="--enable-multilib"
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else
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multilib_arg=
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fi
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AC_CONFIG_FILES(Makefile testsuite/Makefile)
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AC_CONFIG_FILES(testsuite/libatomic-site-extra.exp)
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AC_OUTPUT
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