ChangeLog

== [7.11.0] (development) ==


== [7.10.0] 2025-11-28 ==

* Add comment that overflow of a counter in AO_stack_pop is impossible
* Add missed copyright header to ibmc/powerpc.h
* Adjust/reformat copyright header in armcc/arm_v6.h
* Build tests by default in CMake script
* Change AO_REAL_NEXT_PTR() to accept argument as reference only
* Change static initializer of initial_heap_ptr and spin_dummy to zero
* Consistently use '__sparc' predefined macro w/o trailing underscores
* Define AO_N_BITS to a bigger value if pointer type is larger than size_t
* Define AO_uintptr_t and use it in AO malloc and stack (refactoring)
* Define functions and variables of tests as static (refactoring)
* Discontinue support of configure '--enable-gcov' option
* Do not define AO_GCC_FORCE_HAVE_CAS for modern clang and gcc for RISC-V
* Eliminate 'can be declared as pointer to const' cppcheck FP in test_atomic
* Eliminate 'condition is always true' cppcheck style warnings in test_atomic
* Fix 'libtool library used but LIBTOOL is undefined' autoreconf error
* Give verbose error message if multiple include test_and_set_t_is_*_t.h
* Guard against direct include of internal headers from outside (refactoring)
* Hide AO_initial_heap internal symbol
* Implement AO_fetch_compare_and_swap_full for sunc/sparc
* Minor text improvement in README_details.txt and README_malloc.txt
* New macro (AO_NO_ASM_XCHG) to use Win32 InterlockedExchange
* Prefix/suffix no_sanitize attribute with double underscore (refactoring)
* Provide AO_INITIAL_HEAP_CHUNKS macro to control AO_initial_heap size
* Provide char/short-width CAS for RISC-V w/o '-latomic' if gcc v14+
* Refine comment about AO_double_t size in standard_ao_double_t.h
* Refine documentation when stack implementation is fully lock-free
* Remove AO_stack_push/pop based on compare_and_swap_double
* Rename CMake 'BUILD_SHARED_LIBS' option to 'AO_BUILD_SHARED_LIBS'
* Replace CMake 'build_tests' option to standard 'BUILD_TESTING' one
* Support RISC-V ILP32 ABI (rv64ilp32)
* Support double-wide CAS on 64-bit RISC-V with Zacas extension
* Support double-wide primitives on E2K (in 32- and 64-bit modes)
* Support targets with double-wide pointers (CHERI, E2K protected mode)
* Update autotools for release tar (ac-2.72, am-1.18.1, lt-2.5.4, m4-1.4.20)
* Use AO_internal_ptr_t to operate link pointer inside AO stack and malloc
* Use atomic_ops_sysdeps.S by configure on any SPARC with non-GCC compiler
* Workaround 'memory leak in add_elements' cppcheck FP in test_stack


== [7.8.4] 2025-09-05 ==

* Document Win32-specific AO_NO_ASM_XADD macro in README
* Eliminate 'atomic_thread_fence is unsupported with tsan' gcc-11 warning
* Eliminate 'munmap argument 1 from incompatible pointer type' gcc warning
* Eliminate 'uninitialized memory use' gcc-13 warning in test_atomic
* Fix all broken URLs in comments
* Fix atomic_ops_sysdeps.S compilation for SunPro compiler in CMake script
* Update URLs after repository transfer to bdwgc organization
* Update CMake minimum required version to 3.10


== [7.8.2] 2023-12-15 ==

* Eliminate 'atomic_thread_fence is unsupported with tsan' gcc-11 warning
* Eliminate 'comparing signed/unsigned values' lcc warning in add_chunk_as
* Fix 'undefined reference to AO_pt_lock' if configure is using clang-16
* Fix 'undefined reference to __atomic_load/store/cas_16' Mingw64-gcc error
* Fix 'undefined reference' linker errors if shared build on OpenBSD (CMake)
* Fix get_chunk for case of mmap area is located before AO_initial_heap
* Fix typo in AO_HAVE_compare_and_swap_double name in atomic_ops_stack.h
* Fix typo in comment of run_one_test of test_stack
* Fix typos in comments of atomic_ops_malloc.c and atomic_ops_stack.c/h
* Update cmake minimum required version to 3.5


== [7.8.0] 2023-03-26 ==

* Add AUTHORS file to the list of installed documentation
* Add goal to Makefile.msft to build all tests but not execute them
* Allocate marks[] dynamically and report all found errors in test_stack
* Always export stack_init/push_release/pop_acquire from atomic_ops_gpl
* Always use 'mfence' for nop_full if target CPU supports SSE2 (MS VC/x86)
* Avoid 'cast increases required alignment' warnings in atomic_ops_malloc.c
* Avoid breaking strict-aliasing rules in test_malloc and test_stack
* Avoid code duplication in AO_stack_push_explicit_aux_release
* Better document test_stack internals
* Build atomic_ops.lib by Makefile.msft (MS VC)
* Build test object and executable files in tests folder (MS VC)
* Define AO_stack_t uniformly
* Define double_compare_and_swap_full if MS VS 2017+ (x86)
* Do not expose AO_REAL_HEAD/NEXT_PTR implementation in header by default
* Document config macros in README_win32 and remove them from configure
* Eliminate 'function is never used' cppcheck warning for AO_stack_init
* Enforce most strict level of compiler warnings (MS VC)
* Ensure atomic_ops.c global symbols are always declared as extern 'C'
* Explicitly outline symbols exported in AO shared libraries with AO_API
* Hide AO_free_list symbol
* Implement AO_stack_init using memset
* Implement AO_test_and_set using InterlockedExchange8 (MS VC)
* Implement and/or/xor for AO_t, short and int types (MS VC)
* Implement nf/acq/rel variants of primitives on Windows RT (MS VC)
* Mention MIT near core library licensing terms in LICENSE file
* Move all README_*.txt and license files to the top folder
* Move all non-double intrinsic-based primitives to msftc/common32_defs.h
* Move gcc-4/alpha workaround outside AO_stack_pop_explicit_aux_acquire
* New AO_stack_is_lock_free API function
* New configure option (--disable-gpl) to skip building of libatomic_ops_gpl
* Print message of almost-lock-free implementation in test_stack if used
* Refine LICENSE and README about code parts covered by MIT and GPL-2.0
* Refine copyright terms in GPL source files
* Reformat atomic_ops_stack.c/h files
* Remove 'lib' prefix for atomic_ops_gpl.lib in Makefile.msft
* Remove redundant assert in AO_stack_pop_explicit_aux_acquire
* Remove redundant cast to AO_t in lock-free AO_stack_pop_acquire
* Rename LICENSING.txt to LICENSE file
* Rename VERBOSE macro to VERBOSE_STACK in test_stack (refactoring)
* Rename fetch_and_add to fetch_then_add in test_stack (refactoring)
* Replace obsolete AC_HELP_STRING with AS_HELP_STRING in configure
* Replace obsolete AC_TRY_COMPILE with AC_COMPILE_IFELSE in configure
* Split test_stack main into several functions (refactoring)
* Support Elbrus 2000 (gcc/e2k)
* Support build with CMake
* Support double-wide CAS on armv7+ and UWP/arm64 (MS VC)
* Support test_atomic with MS build w/o the need to run GNU make first
* Update autotools for release tarball preparation (ac-2.71, m4-1.4.19)
* Use GCC atomic intrinsics for SPARC
* Use builtin_expect in AO_stack_push_explicit_aux_release


== [7.6.16] 2023-12-15 ==

* Eliminate 'atomic_thread_fence is unsupported with tsan' gcc-11 warning
* Eliminate 'comparing signed/unsigned values' lcc warning in add_chunk_as
* Fix 'undefined reference to AO_pt_lock' if configure is using clang-16
* Fix 'undefined reference to __atomic_load/store/cas_16' Mingw64-gcc error
* Fix get_chunk for case of mmap area is located before AO_initial_heap
* Fix typo in AO_HAVE_compare_and_swap_double name in atomic_ops_stack.h
* Fix typos in comments of atomic_ops_malloc.c and atomic_ops_stack.c/h


== [7.6.14] 2022-08-25 ==

* Add note to README that AO malloc code has same license as AO stack
* Adjust/reformat content of LICENSING.txt
* Avoid AO_stack_t to cross CPU cache line boundary
* Do not assume 'ordered except earlier write' for UWP/arm64
* Do not name GCC intrinsics as C11 ones in ChangeLog and configure
* Eliminate '-pedantic is not option that controls warnings' GCC-6.3 message
* Ensure result of AO_test_and_set is always AO_TS_CLEAR or AO_TS_SET
* Fix 'AO_malloc redefinition' MS VC warning caused by attributes mismatch
* Fix 'use of undeclared SIG_BLOCK' Clang error if -std=c89 on Cygwin
* Fix AO_compare_and_swap_full asm code for clang on sparc
* Fix a typo in comment of AO_stack_push_explicit_aux_release
* Fix code indentation in main() of test_stack.c
* Refine AO_UNIPROCESSOR macro description in configure
* Remove outdated comment about unsupported Win64 in atomic_ops_stack.h
* Repeat black list check on CAS fail in stack_push_explicit_aux_release


== [7.6.12] 2021-09-13 ==

* Allow to generalize bool-CAS for sparc (gcc)
* Declare argument of AO_load_next with const in atomic_ops_stack
* Describe double_compare_and_swap operation in README_details
* Document CAS operations better in README_details
* Fix gcc/sunc x86 AO_compare_double_and_swap_double missing side effect
* Fix library name in README_details
* Fix link fail caused by missing GCC char/short atomic primitives on riscv64
* Fix size of local variable passed to cas[x] (gcc/sparc)
* Implement fetch-CAS for sparc (gcc)
* Refactor gcc x86 memory constraints
* Refine and reformat description of size prefix in README_details
* Remove outdated notes in README_details
* Replace x86 setz instruction by asm flag output operand (gcc)
* Support MSYS host (configure)
* Turn off compare_double_and_swap_double_full PIC hack for GCC 5+ (x86)
* Update README_win32 to match Makefile.msft
* Use GCC atomic intrinsics for s390x (clang 8.0+ and gcc 5.4+)
* Use __alignof__ instead of sizeof in atomic variable alignment assertions
* Workaround assertion violation in AO_load/store on m68k


== [7.6.10] 2019-03-01 ==

* Eliminate 'my_chunk_ptr-AO_initial_heap out of bounds' cppcheck warning
* Fix 'AO_*_TS_T is not defined' compiler warnings (GCC-8)
* Fix 'duplicate symbol' error for test_malloc/stack with static libs (OS X)
* Workaround 'argument to function assert is always 1' cppcheck warnings


== [7.6.8] 2018-12-11 ==

* Eliminate 'casting signed to bigger unsigned int' CSA warning (test_stack)
* Eliminate 'redundant blank line at start/end of block' CodeFactor warning
* Fix 'Cannot implement CAS_full on this architecture' build error (nios2)
* Fix a typo in arm_v6.h
* Support aarch64-ilp32 (GCC) and UWP/arm64 (MS VC) targets
* Undefine AO_ARM_HAVE_* private macros after their usage
* Use standalone private macro to guard against AO_GCC_BARRIER redefinition
* Workaround 'condition my_chunk_ptr is always false' cppcheck false positive


== [7.6.6] 2018-08-07 ==

* COPYING: sync with FSF's gpl-2.0.txt
* Fix 'undefined reference to __atomic_load/store/cas_16' error (gcc-7/x64)
* Fix a typo in the overview section of README
* Fix comments style in configure.ac and Makefile.am
* Update copyright information in README and some header files


== [7.6.4] 2018-03-27 ==

* Add RISC-V support
* Convert atomic_ops_malloc.c and tests to valid C++ code
* Eliminate 'function is never used' cppcheck warning for load_before_cas
* Eliminate 'using argument that points at uninitialized var' cppcheck error
* Fix 'AO_pt_lock undefined' error if cross-compiling manually (MinGW)
* Fix public headers inclusion from clients C++ code
* Remove gcc/nios2.h file (include gcc/generic.h directly for nios2)
* Support MIPS rel6


== [7.6.2] 2017-12-24 ==

* Allow to alter DEFAULT/MAX_NTHREADS values in test_malloc/stack
* Allow to select almost-non-blocking stack implementation explicitly
* Annotate AO_malloc with 'alloc_size' and 'malloc' attributes
* Avoid misleading 'AO_t undefined' error if wrong atomic_ops.h included
* Define AO_TS_SET to 1 (true) if GCC atomic_test_and_set is used
* Disable workaround in stack_pop_acquire that was needed for ancient Clang
* Do not define AO_GCC_FORCE_HAVE_CAS for Clang 3.8+ (Aarch64)
* Do not disallow to define double_load using built-in atomics (Aarch64)
* Do not expose AO_GCC_FORCE_HAVE_CAS macro to client code (GCC)
* Do not install documentation if configure --disable-docs (new option)
* Do not produce .tar.bz2 distribution file (configure)
* Eliminate '-pedantic is not an option that controls warnings' GCC message
* Eliminate data race in cons() of test_malloc
* Eliminate GCC-5 ASan global-buffer-overflow false positive for AO_stack_bl
* Fill in allocated memory with values depending on thread id (test_malloc)
* Fix 'bad register name %sil' assembler error (GCC-4.4/x86)
* Fix 'unknown attribute no_sanitize' compiler warning for GCC
* Fix AO_malloc for sizes near CHUNK_SIZE
* Fix memory leak in test_malloc
* Fix test failures for Clang-3.8 and older (Aarch64)
* Fix test_stack failure if AO_PREFER_BUILTIN_ATOMICS (GCC/Aarch64)
* Fix typo in AO_REAL_NEXT_PTR comment
* Increase the default number of threads to 16 in test_malloc/stack
* Mark unallocated/freed memory as inaccessible using ASan functionality
* New macro (DONT_USE_MMAP) to support testing as if mmap() is unavailable
* New macro to select stack implementation based on CAS-double
* Place no_sanitize attributes in a GCC-compliant way
* Prevent too long run of test_atomic_generalized (especially with TSan)
* Simplify '#if' expressions in gcc/x86.h (code refactoring)
* Test smallest allocation of large type (test_malloc)
* Use __builtin_expect in atomic_ops_malloc
* Use built-in atomics for load/store/CAS for Clang by default (Aarch64)
* Use double-word atomic intrinsics for recent Clang versions (gcc/x86.h)
* Use GCC atomic intrinsics for Hexagon (clang 3.9+)
* Use generalized double-wide load/store if AO_PREFER_GENERALIZED (Aarch64)
* Workaround 'unused result' code defects in atomic_ops.c, list_atomic
* Workaround Thread Sanitizer (TSan) false positive warnings
Also, includes 7.4.8 changes


== [7.6.0] 2017-05-19 ==

* Add *_and/or/xor* and *_[fetch_]compare_and_swap* tests to test_atomic
* Add asm-based and/or/xor implementation for char/short/int (gcc/x86)
* Add asm-based char/short/int CAS implementation for gcc/x86[_64]
* Add configure '--disable-atomic-intrinsics' option
* Add dd_acquire_read case to test_atomic
* Add initial nios2 architecture support
* Add Makefile target (check-nolink) to compile all source without linking
* Add Makefile target to run all tests without test-driver
* Add test_atomic_generalized to Makefile and Makefile.msft
* Allow alternate CC (CROSS_CC) for AC_TRY_COMPILE (configure)
* Always define word-wide CAS for x86 (MS VC++ 8+)
* Avoid atomic_compare_exchange_n if no __GCC_HAVE_SYNC_COMPARE_AND_SWAP_n
* Avoid extra nop_full in stack_pop_acquire if atomic intrinsics used (x86)
* Basic support of TILE-Gx and TILEPro CPUs
* Code refactoring of int-wide primitives in gcc/x86.h
* Define AO_TS_SET as __GCC_ATOMIC_TEST_AND_SET_TRUEVAL if applicable
* Define CLANG/GNUC_PREREQ macros to check gcc/clang minimum version
* Do not define print_list() unless used (tests)
* Eliminate 'condition sizeof(long)>4 is always true' cppcheck style warning
* Eliminate 'ISO C90 does not support long long' compiler pedantic warning
* Eliminate 'scope of variable can be reduced' cppcheck warnings
* Eliminate redundant lwsync 2nd call in CAS_full on fail (gcc/PowerPC)
* Fix 'unknown attribute no_sanitize' compiler warning (clang prior to v3.8)
* Fix 'variable new value is never used' cppcheck style warning
* Fix missing double_compare_and_swap_dd_acquire_read
* Fix reporting about missing and/or/xor_dd_acquire_read (test_atomic)
* Hide AO_locks symbol
* Implement AO_CLEAR using atomic intrinsic (GCC)
* Implement CAS_acquire/release/full using __atomic_compare_exchange_n (gcc)
* Implement char and/or/xor and short CAS for msftc ARM and X86[_64]
* Implement char CAS and char/short add for msftc X86[_64] (VS 2013+)
* Implement compiler_barrier using __atomic_signal_fence (GCC)
* Implement int CAS/inc/dec for msftc/x86_64
* Implement short inc/dec directly for msftc ARM and X86[_64]
* Initial ibmc/powerpc (xlc) support
* New configure option (--enable-werror) to treat warnings as compiler errors
* New macro AO_PREFER_BUILTIN_ATOMICS to rely on GCC atomics fully (AArch64)
* Refine AO_nop_write comment for ARM big.LITTLE architecture
* Refine configure messages when checking for compiler options
* Refine documentation about _full memory ordering suffix
* Refine README how to build the library source from the repository
* Relax shareability domain for dmb st in AO_nop_write (ARM/AArch64)
* Remove redundant include windows.h from headers (msftc/x86[_64])
* Remove spaces at EOLn in asm code
* Report gcc/clang pedantic warnings (configure)
* Support NaCl/arm
* Suppress 'ISO C does not support __int128 type' GCC/Clang pedantic warning
* Test store/CAS emulation explicitly
* Update shared libraries version info to 2:0:1
* Use GCC atomic intrinsics for PowerPC 32/64 (GCC 4.8+ and clang 3.8+)
* Use GCC atomic intrinsics for x86, x64, ARM, MIPS (gcc 4.9+, clang 3.5+)
* Use generalized double-wide load/store if AO_PREFER_GENERALIZED (gcc/x86)
* Workaround '#error' cppcheck error messages
* Workaround 'condition always true', 'unused stored value' cppcheck warnings
* Workaround 'function is never used' cppcheck style warnings
* Workaround 'obsolescent ftime called' cppcheck style warning (POSIX)
* Workaround 'overflow in pointer subtraction' cppcheck warning
* Workaround 'shifting 32-bit value by 32 bits undefined' cppcheck warning
* Workaround 'uninitialized memory use' code analyzer false warning (tests)
* Workaround 'uninitialized variable' cppcheck error in hpc/hppa.h
* Workaround 'value of macro is unknown' cppcheck information messages
* Workaround a bug in double-wide intrinsics of Clang/x64 with ASan enabled
* Workaround MSan warning about uninitialized data read by generalized store
Also, includes 7.4.6 changes


== [7.4.20] 2023-12-15 ==

* Eliminate 'comparing signed/unsigned values' lcc warning in add_chunk_as
* Fix get_chunk for case of mmap area is located before AO_initial_heap
* Fix typo in AO_HAVE_compare_and_swap_double name in atomic_ops_stack.h
* Fix typos in comments of atomic_ops_malloc.c and atomic_ops_stack.c/h


== [7.4.18] 2022-08-25 ==

* Avoid AO_stack_t to cross CPU cache line boundary
* Do not assume 'ordered except earlier write' for UWP/arm64
* Ensure result of AO_test_and_set is always AO_TS_CLEAR or AO_TS_SET
* Fix 'use of undeclared SIG_BLOCK' Clang error if -std=c89 on Cygwin
* Fix a typo in comment of AO_stack_push_explicit_aux_release
* Fix code indentation in main of test_stack.c
* Remove outdated comment about unsupported Win64 in atomic_ops_stack.h
* Repeat black list check on CAS fail in stack_push_explicit_aux_release


== [7.4.16] 2021-09-13 ==

* Fix gcc/sunc x86 AO_compare_double_and_swap_double missing side effect
* Fix library name in README_details
* Fix size of local variable passed to cas[x] (gcc/sparc)
* Workaround assertion violation in AO_load/store on m68k


== [7.4.14] 2019-03-01 ==

* Fix 'AO_*_TS_T is not defined' compiler warnings (GCC-8)


== [7.4.12] 2018-12-11 ==

* COPYING: sync with FSF's gpl-2.0.txt
* Fix a typo in arm_v6.h
* Fix a typo in the overview section of README
* Support ILP32 in AArch64 assembly routines (GCC)
* Support UWP/arm64 target


== [7.4.10] 2017-12-22 ==

* Fix AO_malloc for sizes near CHUNK_SIZE
* Fix memory leak in test_malloc
* Fix typo in AO_REAL_NEXT_PTR comment


== [7.4.8] 2017-10-18 ==

* Fix 'missing select.h', 'undefined sigprocmask' compiler errors (Hexagon)
* Update README about bugs reporting and new releases notification
* Workaround misspelling in GCC to detect ARMv6KZ platform


== [7.4.6] 2017-05-18 ==

* Add assertion that double-wide CAS target is aligned (msftc/x86[_64])
* Add configure --enable-gcov option (enable code coverage analysis)
* Code refactoring of gcc/powerpc.h to avoid code duplication
* Eliminate 'cast to long from void*' compiler warning in test_atomic
* Eliminate 'implicit declaration of close' warning in 'strict ANSI' mode
* Eliminate 'missing braces around initializer' gcc warning (hppa)
* Eliminate 'printf format specifies type void*' GCC pedantic warnings
* Eliminate 'value shift followed by expansion' false code defect warning
* Enable limited testing in Makefile.msft without Cygwin
* Fix (delete) comment for AO_and_full (x86)
* Fix block_all_signals compilation in 'strict ANSI' mode
* Fix missing .exe for test filenames in Makefile (MinGW)
* Fix missing printed value names (test_stack)
* Implement fetch-CAS for s390[x] (gcc)
* Move libraries version info to the beginning of Makefile.am
* Refine documentation in Makefile.msft how to run all tests (MS VC)
* Refine README about library downloading
* Rename doc/README.txt to doc/README_details.txt
* Support AIX/ppc (gcc)
* Support CFLAGS_EXTRA to pass extra user-defined compiler flags (make)
* Support n32 ABI for mips64
* Update shared libraries version info for 7.4.6+ (to 1:4:0)
* Use 'inline code' format for commands in README.md
* Use LLD and SCD instructions on mips64
* Workaround 'resource leak' false positives in AO_malloc, add_elements
* Workaround 'uninitialized memory use' MemorySanitizer warning (test_atomic)
Also, includes 7.2h changes


== [7.4.4] 2016-05-24 ==

* Eliminate 'signed-to-unsigned value extension' compiler warning in malloc
* Eliminate 'variable set but not used' Cppcheck warnings in test_stack
* Fix GCC 5.x compatibility for AArch64 double-wide primitives
* Fix makefile preventing AO_pause undefined in libatomic_ops_gpl
* Fix missing casts to match printf format specifier in test_atomic
* Fix missing output folder on making auto-generated test files (Automake)
* Fix typo in configure.ac (in description of AO_ASM_X64_AVAILABLE)
* Minor fix of code alignment in mips AO_compare_and_swap
* Remove TODO file
* Restore contribution info in ChangeLog for authors not listed in git log
Also, includes 7.2g changes


== [7.4.2] 2014-05-02 ==

* Fix a typo in doc/README.txt (remove redundant "an" article)
* Update emails/links due to project site transition
Also, includes 7.2f changes


== [7.4.0] 2013-11-17 ==

* Add and/or/xor entries to list_atomic (tests)
* Add char/short/int/AO_double_t and dd_acquire cases to list_atomic (tests)
* Add compile-time assertion for size of 'standard' AO_double_t
* Add double_store pthread-based implementation and tests
* Add generalized CAS primitives of char/short/int size
* Add generalized atomic and/or/xor operations for char/short/int types
* Add generalized fetch_and_add_acquire/release (for ARMv6+)
* Add generic implementation of double_load primitives
* Add information about AO_ASSUME_VISTA to README_win32
* Add internal header containing only char/short/int/AO_t atomic loads
* Add load/store primitives generalization based on CAS
* Add lock-based implementation of char/short/int_fetch_compare_and_swap
* Add makefile rule to test list_atomic.template syntax (tests)
* Add missing 'const' in aligned-atomic XSIZE_load implementation
* Add missing double_compare_and_swap to generalization
* Add missing generalization of no-barrier CAS in template
* Add negative double-CAS test cases to test_atomic_include (tests)
* Add test_stack to Makefile.msft (tests)
* Adjust fprintf arguments type matching specifier in test_stack (tests)
* Adjust included filenames in atomic_ops_malloc and test_stack
* Adjust quotes in echo command of Makefile.msft (Win32)
* Always use 'mfence' for nop_full if target CPU supports SSE2 (gcc/x86)
* Better document configure THREADDLLIBS variable
* Cast away volatile on dereference in CAS-based generalization primitives
* Change policy regarding version numbers ("micro" part instead of "alpha")
* Convert README to Markdown format
* Define AO_NO_PTHREADS in configure if no pthreads (Win32 and VxWorks)
* Define AO_int_X operations for ARM and avr32
* Define double-wide ordered loads/stores for x86
* Define int_and/or/xor primitives in ao_t_is_int header
* Define nop_full as compiler barrier for pre-ARMv6 single-core case
* Do not duplicate BUILT_SOURCES entries in nobase_private_HEADERS (Makefile)
* Do not include standard_ao_double_t.h where double-CAS is unimplemented
* Do not report absence of meaningless nop, load and store in test_atomic
* Do not use deprecated AO_T and AO_TS_T (tests)
* Eliminate 'missing initializer' warning for AO_stack_t value initializer
* Eliminate 64-bit compiler warnings in atomic_ops_malloc
* Eliminate arithmetic shifts in double-CAS (gcc/arm, msftc/x86)
* Eliminate warning for fetch_and_add argument in test_atomic_include (tests)
* Enable Makefile.msft for Win64
* Enable build using toolchain without pthreads
* Enable double_compare_and_swap for non-cpp code (msftc/x86.h)
* Enable generalization of all variants of CAS via fetch_compare_and_swap
* Enable test_stack for pthreads-w32 and Win32 with native threads
* Fix generalized AO_char/short_compare_and_swap args (missing 'unsigned')
* Fix makefile sed rule for list_atomic (tests)
* Fix missing abort() usage in atomic_ops_malloc and tests on WinCE
* Generalize compare_double_and_swap_double using double_compare_and_swap
* Generalize double_load/store for x86_64 (GCC)
* Generate ao_t_is_int, 'loadstore' headers from templates
* Generate generalized AO_t load/store/fetch_and_add primitives from template
* Generate ordered_loads/stores_only headers from templates
* Group all X_acquire_release_volatile.h and X_[aligned_]atomic_load_store.h
* Implement and/or/xor, AO_double_load for ARM
* Implement atomic store using direct write by default on ARMv6+
* Implement char/short/int-wide primitives using GCC built-in atomic/sync
* Implement char/short/int_fetch_and_add for msftc/x86[_64] (Win32)
* Implement char/short_fetch_and_add, char/short_load for ARMv6+ (GCC)
* Implement char/short_store primitives at aligned addresses for ARM
* Implement compare_double_and_swap_double for SunCC/x86
* Implement double_load/store based on guaranteed x86 access atomicity
* Implement double_store for ARMv7 using LDREXD/STREXD
* Implement load/store via simple LDR/STR for ARMv6+ (msftc)
* Implement nop_full/write using 'dmb' instruction if available (gcc/arm)
* Improve debug printing in test_stack (tests)
* Log messages to stdout instead of stderr (tests)
* Make AO_ASSUME_VISTA also enables Win98 code in msftc/x86.h (Win32)
* Minimize gcc/generic-arithm template by factoring out barriers
* Move 'unsigned' keyword to XCTYPE in generalize-small template
* Move default compiler options to CFLAGS in Makefile.msft (Win32)
* Move definitions of ordered loads/stores to inner separate headers
* Move gcc-generic AO_t-wide primitives to generic-small/arithm headers
* Move generalized arithmetical primitives to 'generalize-arithm' template
* Optimize AO_spin manually to minimize compiler influence on its duration
* Parameterize list_atomic template with XSIZE (tests)
* Perform only few list reversals in test_malloc if AO based on pthreads
* Put autogen.sh to 'dist' package (Automake)
* Remote duplicate definition of test_and_set_acquire in generalize.h
* Remove X_aligned_atomic_load_store headers and template
* Remove duplicate AO_spin and AO_pause definition in atomic_ops_stack
* Remove gcc/x86_64.h eliminating code duplication of gcc/x86.h
* Remove nested AO_USE_PTHREAD_DEFS macro check in atomic_ops.h (gcc/arm)
* Remove redundant 'cc' clobber for LDREXD instruction (gcc/arm)
* Remove store_full from msftc/arm.h in favor of generalized primitive
* Remove sunc/x86_64.h eliminating code duplication of sunc/x86.h
* Remove unsafe emulation-based implementation of double CAS (SunCC/x86_64)
* Remove useless 'perror' call in run_parallel.h (tests)
* Reorder AO_double_t union elements for AO_DOUBLE_T_INITIALIZER portability
* Replace atomic_load_store.template with atomic_load and atomic_store ones
* Replace some FIXME items with TODO in atomic_ops.c and sysdeps headers
* Specify fetch_and_add/sub1 result as unused in test_atomic (tests)
* Support AArch64 (64-bit ARM) target (GCC)
* Support ARMv8 target (gcc/arm)
* Test double_compare_and_swap in test_atomic (tests)
* Use AO_ prefix for internal functions in arm_v6.h, hppa.h
* Use __atomic GCC built-in to implement generic double-wide CAS
* Use built-in __sync CAS for double-CAS if AO_USE_SYNC_CAS_BUILTIN for x86
* Workaround GCC 4.4.3 warning reported for 'val' of list_atomic.c (tests)
Also, includes 7.2e changes


== [7.3alpha2] 2012-05-11 ==

* Add '-no-undefined' to LDFLAGS in src/Makefile.am
* Add AO_and, AO_xor atomic operations
* Add AO_fetch_compare_and_swap primitives
* Add and fill in AUTHORS, TODO files
* Add autogen.sh file
* Adjust AO_..._H macros in public headers
* Code refactoring of gcc/arm.h by introducing AO_ARM_HAVE_x macros
* Define AO macros for libatomic_ops version identification
* Do not define NDEBUG if '--enable-assertions' passed to configure
* Eliminate compiler warnings in various functions and macros
* Generalize AO_compare_and_swap primitives via AO_fetch_compare_and_swap
* Generalize acquire/release/full CAS primitives for MIPS
* Implement fetch_and_add, test_and_set primitives for MIPS
* Improve Makefile for MS VC++; pass '-W3' option to MS compiler
* Include ao_t_is_int.h from atomic_ops.h after first generalization pass
* Merge all Makefile.am files in src tree
* Minor code refactoring of atomic_ops.c, generic_pthread.h
* Minor configure build improvements (e.g., ensure proper autoconf version)
* Place only major per-release changes description to ChangeLog (this file)
* Recognize AO_PREFER_GENERALIZED macro to favor generalization over assembly
* Remove all auto-generated files except for generalize-small.h from the repo
* Remove duplicate doc/COPYING and empty NEWS files
* Replace atomic_ops_malloc static mmap-related empty functions with macros
* Replace pointer relational comparisons with non-pointer ones
* Require autoconf 2.61 instead of v2.64
* Show extra compiler warnings (GCC only)
* Turn off AO primitives inlining if AO_NO_INLINE defined
* Use __builtin_expect in CAS failure loop condition checks (GCC only)
Also, includes 7.2 changes


== [7.2l] 2023-12-15 ==

* Fix get_chunk for case of mmap area is located before AO_initial_heap
* Fix typo in AO_HAVE_compare_and_swap_double name in atomic_ops_stack.h
* Fix typos in comments of atomic_ops_malloc.c and atomic_ops_stack.c/h


== [7.2k] 2022-08-24 ==

* Avoid AO_stack_t to cross CPU cache line boundary
* Fix a typo in comment of AO_stack_push_explicit_aux_release
* Fix code indentation in main of test_stack.c
* Remove outdated comment about unsupported Win64 in atomic_ops_stack.h
* Repeat black list check on CAS fail in stack_push_explicit_aux_release


== [7.2j] 2021-09-12 ==

* Fix a typo in arm_v6.h
* Fix asm constraints of primitives in sunc/x86_64.h
* Fix gcc/sunc x86 AO_compare_double_and_swap_double missing side effect
* Fix library name in README details
* Fix size of local variable passed to cas[x] (gcc/sparc)
* Workaround assertion violation in AO_load/store on m68k


== [7.2i] 2017-12-21 ==

* Fix 'missing select.h', 'undefined sigprocmask' compiler errors (Hexagon)
* Fix AO_malloc for sizes near CHUNK_SIZE
* Fix typo in AO_REAL_NEXT_PTR comment


== [7.2h] 2017-05-17 ==

* Add 'clean' target to Makefile.msft
* Enable Makefile.msft for Win64
* Exclude 'check' from nmake all (Makefile.msft)
* Fix 'Cannot implement CAS_full on this architecture' build error (cris)
* Fix 'doc' files installation folder
* Fix (improve) AO_REQUIRE_CAS description in README
* Fix AO_SIZE_MAX definition (Linux/musl-gcc)
* Fix assertions style in test_atomic_include
* Fix size value wrap around in AO_malloc_large
* Fix test_atomic failure caused unaligned AO_double_t access (x86)
* Fix type of general AO_TS_INITIALIZER
* Fix typo in comments in gcc/arm.h
* Fix typos in 'error' pragma messages
* Workaround test_stack failure on AIX/ppc


== [7.2g] 2016-05-23 ==

* Add disclaimer to README to favor C11/C++14 atomics over libatomic_ops use
* Regenerate configure files using official libtool release (v2.4.2)
* Remove inclusion of acquire_release_volatile.h on MIPS
* Remove obsolete information from README about C++0x standard future
* Update links due to project site transition


== [7.2f] 2014-05-02 ==

* Fix a typo in doc/README.txt (remove redundant "an" article)
* Regenerate configure files by new automake (v1.14.1), libtool (v2.4.2.418)


== [7.2e] 2013-11-10 ==

* Fix (remove) invalid include of read_ordered.h for ARM
* Fix AM_CONFIG_HEADER in configure for autoconf-2.69-1
* Fix AO_pause sleep delay for particular argument values (Win32)
* Fix ARMv7 LDREXD/STREXD double-wide operand specification (GCC/Clang)
* Fix LDREXD/STREXD use for pre-Clang3.3/arm
* Fix README regarding _acquire_read barrier
* Fix XSIZE_load/store definition order in generalize-small template
* Fix asm constraint of CAS memory operand for gcc/alpha, clang-3.1/mips
* Fix asm constraints of primitives in sunc/x86.h
* Fix cmpxchg16b-based compare_double_and_swap_double for SunCC/x86_64
* Fix compare_double_and_swap_double and double_ptr_storage for gcc/x32
* Fix compare_double_and_swap_double for clang3.0/x86 in PIC mode
* Fix compare_double_and_swap_double_full definition condition in emul_cas
* Fix generalize-small template adding missed CAS-based fetch_and_add
* Fix generalized fetch_and_add function
* Fix missing compiler barrier in nop_full for uniprocessor ARM
* Fix ordered_except_wr header inclusion for s390
* Fix return type of AO_int_X primitives defined in ao_t_is_int header
* Fix return type of char/short/int_load_read() in read_ordered.h
* Fix template-based headers regeneration order in src/Makefile
* Fix typos in ao_t_is_int, atomic_ops.h, generalize.h, msftc/arm.h comments
* Fix variable type to match printf format specifier in test_stack
* Fix visibility and initial value of 'dummy' variable in atomic_ops_stack
* Terminate tests with abort after error reported


== [7.2d] 2012-08-09 ==

* Fix AO_compare_double_and_swap_double_full for gcc-4.2.1/x86 in PIC mode
* Fix AO_compiler_barrier missing parentheses
* Fix missing 'unsigned' for generalized AO_char/short_fetch_and_add result


== [7.2] 2012-05-11 ==

* Add atomic_ops.pc.in and atomic_ops-uninstalled.pc.in to pkgconfig folder
* Define and use AO_PTRDIFF_T in tests for casts between pointer and integer
* Fix AO_compare_and_swap return type for s390 and PowerPC
* Fix AO_compare_double_and_swap_double_full for gcc/x86 (PIC mode)
* Fix AO_stack_push_release to workaround bug in clang-1.1/x86 compiler
* Fix AO_test_and_setXX in tests/list_atomic.template
* Fix AO_test_and_set_full (gcc/x86[_64].h) to work-around a bug in LLVM v2.7
* Fix AO_test_and_set_full on m68k
* Fix __ARM_ARCH_5__ macro handling for Android NDK (ARMv7)
* Fix configure for Cygwin, mingw-w64/32
* Fix configure to define __PIC__ macro explicitly if needed (GCC)
* Fix double_ptr_storage definition for GCC pre-v4 (x86_64)
* Fix for x32 by removing 'q' suffix in x86-64 instructions
* Fix generalization for IA-64 (regarding AO_or, AO_..._read/write primitives)
* Fix generalized AO_<type>_fetch_and_add() return type
* Fix test_atomic_include for the case of missing CAS primitive
* Fix test_malloc - allocate less memory in case of missing mmap
* Implement the basic atomic primitives for the hexagon CPU


== [7.2alpha6] 2011-06-14 ==

* Add missing AO_HAVE_ macros
* Add support of avr32 CPU
* Better support of various models of ARM
* Disable AO_compare_double_and_swap_double_full for SunCC x86 as not working
* Enable ARM Thumb-2 mode
* Fix AO_test_and_set_full for SunCC (x86)
* Fix bugs in tests
* Fix clobbers in AO_compare_and_swap_full (x86.h)
* Fix typos in identifiers and comments
* Improve AO_sync for PowerPC
* Improve make scripts (configure.ac)
* Make get_mmaped() in atomic_ops_malloc.c more portable
* Support Intel compiler
* Support NaCl target
* Suppress compiler warnings in various places
* Test more predefined macros (ARM, PowerPC)
* Use assembly code only for MS VC if available (x86_64)
* Use built-in __sync_bool_compare_and_swap if available (x86_64)
* Workaround bugs in LLVM GCC and SunCC regarding XCHG (x86, x86_64)


== [7.2alpha4] 2009-12-02 ==

* Fix typos in comments, identifiers and documentation
* Implement AO_compare_and_swap_full for SPARC
* Refine ARM-specific code
* Refine code and comments for MS VC
* Regenerate make scripts
* Share common code for all 32-bit CPUs (MS VC)
* Support DigitalMars and Watcom compilers
* Support MS VC for ARM (WinCE)
* Support SH CPU
* Support win32-pthreads
* Support x86 and x86_64 for SunCC compiler


== [7.2alpha2] 2009-05-27 ==

* Add MIPS support
* Add better support for m68k
* Add "const" to first parameter of load calls
* Add parentheses around address argument for various macros
* Add some platform-specific documentation to INSTALL
* Add untested 64-bit support for PowerPC
* Fix AO_compare_and_swap_double_acquire
* Fix AO_int_fetch_and_add_full (x86_64)
* Fix comments
* Fix s390 include paths
* Fix use of lwz instruction (PowerPC)
* Refine clobbers (PowerPC)
* Remove outdated info about Windows support in README
* Replace K&R-style function definition with ANSI C one
* add AO_compare_double_and_swap_double for ARMv6
* gcc/powerpc.h: Consider __NO_LWSYNC__


== [7.1] 2008-02-11 ==

* Add test_and_set, AO_double_compare_and_swap generalizations
* Conditionally add compare_double_and_swap_double (x86)
* Conditionally add compare_double_and_swap_double (x86)
* Fix AO_compare_double_and_swap_double_full (x86) for PIC mode
* Fix AO_load_acquire for PowerPC
* Fix double-width CAS (x86)
* Refine README (add more warnings about data dependencies)
* Refine double_ptr_storage type definition
* Support ARMv6+ in GCC
* Support ArmCC compiler
* Use _InterlockedExchangeAdd for MS VC (x86)


== [7.0] 2007-06-28 ==

* Add 64-bit version of AO_load_acquire for PowerPC (by Luca Barbato)
* Add support of x86 and x86_64 for MS VC
* Do not assume that "mfence" is always present (x86.h)
* Fix ARM AO_test_and_set_full
* Include windows.h (MS VC)
* Update README to reflect C++0x effort


== [1.2] 2006-07-11 ==

* Add prototypes to suppress compiler warnings
* Add simple VxWorks support
* Fix InterlockedCompareExchange proto usage
* Fix typos (ia64)
* Include all_acquire_release_volatile.h and all_atomic_load_store.h (ia64)
* Initial support for 64-bit targets
* Use "=q" for AO_test_and_set_full (x86)
* Use inline assembler to generate "mfence" and byte sized XCHG
* Use new intrinsics available in MSVC 2003 and MSVC 2005


== [1.1] 2005-09-27 ==

* Add and use read_ordered.h
* Change function naming from "byte" to "char"
* Fix AO_test_and_set for ARM; define AO_CAN_EMUL_CAS


== [1.0] 2005-03-21 ==

* Add atomic_ops primitives for different sized data
* Add compare_double_and_swap_double and compare_and_swap_double
* Add gcc/cris.h (originally comes from Hans-Peter Nilsson)
* Add gcc/m68k.h (contributed by Tony Mantler)
* Add gcc/powerpc.h (with help of Maged Michael, Doug Lea, Roger Hoover)
* Add initial support for atomic_ops for VC++/Windows/X86 and HP/UX
* Add minimal support for the Sun SPARC compiler
* Add support for platforms that require out-of-line assembly code
* Add support of int-wide operations on platforms with int-sized pointers
* Added libatomic_ops_gpl library with support for lock-free stack and malloc
* Change atomic_ops include file structure
* Change most platforms to use byte-wide test-and-set locations
* Define AO_CLEAR, __ldcw[_align] macros in gcc/hppa.h (by Carlos O'Donell)
* Fix various bugs
* Install under "atomic_ops" instead of "ao"
* Remove compiler_barrier workaround for gcc 3.4+
* Renamed various types to end in _t
* Replace AO_HAVE_NOP_FULL with AO_HAVE_nop_full (by Ranko Zivojnovic)
* Use autoconf, automake