Avoid extra nop_full in stack_pop_acquire if atomic intrinsics used (x86)

* src/atomic_ops/generalize.h [AO_HAVE_double_compare_and_swap_acquire]
(AO_compare_double_and_swap_double_acquire): Implement (by redirecting
to AO_double_compare_and_swap_acquire).
* src/atomic_ops/generalize.h [AO_HAVE_double_compare_and_swap_release]
(AO_compare_double_and_swap_double_release): Implement (by redirecting
to AO_double_compare_and_swap_release).

Add CI (continuous integration) badges to README

Refine README how to build the library source from the repository

* README.md (Installation and Usage): Add information that autogen.sh
should be launched first if building from the development repository.

Refine README about library downloading

* README.md (Download): New section; add link to Download page (located
on GitHub); add information about the code repository.

Add asm-based and/or/xor implementation for char/short/int (gcc/x86)

* src/atomic_ops/sysdeps/gcc/x86.h [AO_DISABLE_GCC_ATOMICS]
(AO_char_and_full, AO_char_or_full, AO_char_xor_full,
AO_short_and_full, AO_short_or_full, AO_short_xor_full): New inline
function.
* src/atomic_ops/sysdeps/gcc/x86.h [AO_DISABLE_GCC_ATOMICS
&& !AO_T_IS_INT] (AO_int_and_full, AO_int_or_full, AO_int_xor_full):
Likewise.

Fix (delete) comment for AO_and_full (x86)

* src/atomic_ops/sysdeps/gcc/x86.h [!AO_PREFER_GENERALIZED]
(AO_and_full): Remove incorrect comment (the code should work even for
i386).
* src/atomic_ops/sysdeps/sunc/x86.h [!AO_PREFER_GENERALIZED]
(AO_and_full): Likewise.

Add configuration file for AppVeyor CI

* appveyor.yml: New file (not a part of the distribution archive).

Add configure '--disable-atomic-intrinsics' option

* configure.ac (atomic-intrinsics): New configure option.
* configure.ac (AO_DISABLE_GCC_ATOMICS): Replace AH_TEMPLATE with
AC_DEFINE depending atomic-intrinsics option.

Fix store-load ordering in AO_stack_pop_explicit_aux_acquire (PowerPC)

Issue #15.

The core issue is that AO_stack_pop_explicit_aux_acquire really needs
to ensure that the store to the blacklist via
AO_compare_and_swap_acquire becomes visible before the load to check
the list head.  This effectively needs store-load ordering.
Currently the only ordering here is imposed by the _acquire on the
compare_and_swap.  On PowerPC that turns into an lwsync, which is too
weak to enforce store to load ordering.

This patch should fix the issue.  But this is suboptimal on x86, and
we may want to make the fence conditional on "not x86", where the CAS
already includes sufficient ordering.  (With C++11 atomics, this would
also be tricky and probably involve making a bunch of accesses seq_cst.)

* src/atomic_ops_stack.c [AO_USE_ALMOST_LOCK_FREE]
(AO_stack_pop_explicit_aux_acquire): Call AO_compare_and_swap instead
of AO_compare_and_swap_acquire; call AO_nop_full just before
(first != AO_load(list)).

Add configuration for Travis CI

* .travis.yml: New file.

Update ChangeLog file

Update ChangeLog file (v7.2 - v7.4 changes only)

Add disclaimer to README to favor C11/C++14 atomics over libatomic_ops use

* README.md: Add top-level disclaimer that it is better to use
C11 or C++14 atomic primitives instead of this library for the
newly-developed code.

gcc/generic-small.h: Add TODO items

* src/atomic_ops/sysdeps/gcc/generic-small.h: Regenerate.
* src/atomic_ops/sysdeps/gcc/generic-small.template: Add TODO items
for XSIZE_load_read, XSIZE_load_full, XSIZE_load_dd_acquire_read,
XSIZE_store_write.

Refine documentation about _full memory ordering suffix

* doc/README.txt (_full): Refine documentation (regarding AO_nop_full
mostly).

Update AUTHORS file

Basic support of TILE-Gx and TILEPro CPUs

This patch is an updated version of the CentOS 6 patch that we have
been carrying as part of our own CentOS-like distribution since 2012.

* src/Makefile.am (nobase_private_HEADERS): Add tile.h.
* src/atomic_ops.h [__tile__]: Include tile.h file.
* src/atomic_ops/sysdeps/gcc/tile.h: New file.

Update ChangeLog file

Update ChangeLog file (v7.2 - v7.4 changes only)

Use GCC atomic intrinsics for x86 and x64 (gcc 4.8+ and clang 3.4+)

* src/atomic_ops/sysdeps/gcc/generic.h (AO_GCC_HAVE_double_SYNC_CAS):
Do not define if AO_SKIPATOMIC_double_compare_and_swap_ANY.
* src/atomic_ops/sysdeps/gcc/x86.h (AO_GCC_ATOMIC_TEST_AND_SET): Define
if gcc4.8+ (but not Intel compiler) or clang3.4+ (if not
AO_DISABLE_GCC_ATOMICS).
* src/atomic_ops/sysdeps/gcc/x86.h [AO_GCC_ATOMIC_TEST_AND_SET]: Do not
include all_aligned_atomic_load_store.h, test_and_set_t_is_char.h,
ordered_except_wr.h.
* src/atomic_ops/sysdeps/gcc/x86.h (AO_nop_full, AO_fetch_and_add_full,
AO_char_fetch_and_add_full, AO_short_fetch_and_add_full, AO_and_full,
AO_or_full, AO_xor_full, AO_test_and_set_full,
AO_compare_and_swap_full) [AO_GCC_ATOMIC_TEST_AND_SET]: Do not define.
* src/atomic_ops/sysdeps/gcc/x86.h: Include standard_ao_double_t.h if
AO_PREFER_BUILTIN_ATOMICS, or AO_GCC_ATOMIC_TEST_AND_SET and not
clang/x86.
* src/atomic_ops/sysdeps/gcc/x86.h (AO_double_load_acquire,
AO_double_store_release, AO_SKIPATOMIC_double_compare_and_swap_ANY):
Define if AO_GCC_ATOMIC_TEST_AND_SET and clang/x86 (unless
AO_PREFER_BUILTIN_ATOMICS).
* src/atomic_ops/sysdeps/gcc/x86.h
(AO_compare_double_and_swap_double_full) [x86]: Define also for
clang/x86 if AO_GCC_ATOMIC_TEST_AND_SET (unless
AO_PREFER_BUILTIN_ATOMICS).
* src/atomic_ops/sysdeps/gcc/x86.h
(AO_compare_double_and_swap_double_full) [x86_64]: Remove TODO item;
check __GCC_HAVE_SYNC_COMPARE_AND_SWAP_16 to detect presence of
cmpxchg16b.
* src/atomic_ops/sysdeps/gcc/x86.h: Include generic.h if
AO_GCC_ATOMIC_TEST_AND_SET.
* src/atomic_ops/sysdeps/standard_ao_double_t.h (double_ptr_storage):
Use unsigned __int128 instead of __m128 for GCC x86_64 atomic
intrinsics.

Do not force GCC atomic intrinsics usage if AO_PREFER_BUILTIN_ATOMICS

The macro should only prevent usage of assembly completely but only
if at least some of GCC atomic intrinsics are available.

* src/atomic_ops/sysdeps/gcc/arm.h (AO_PREFER_BUILTIN_ATOMICS): Remove
from the condition whether to include generic.h.
* src/atomic_ops/sysdeps/gcc/mips.h (AO_PREFER_BUILTIN_ATOMICS):
Likewise.

Add AO_DISABLE_GCC_ATOMICS, AO_PREFER_BUILTIN_ATOMICS macros to configure

* configure.ac (AO_DISABLE_GCC_ATOMICS, AO_PREFER_BUILTIN_ATOMICS):
Declare and document (using AH_TEMPLATE).

Fix typo in configure.ac (in description of AO_ASM_X64_AVAILABLE)

* configure.ac (AO_ASM_X64_AVAILABLE): Fix typo ("available").

Remove AO_T_IS_INT definition for GCC atomic intrinsics case
(Code refactoring)

In case of GCC/C11 atomic intrinsics are used, AO_int_* are defined in
generic-arithm.h and generic-small.h files.

* src/atomic_ops/sysdeps/gcc/arm.h (AO_T_IS_INT): Do not define if
AO_GCC_ATOMIC_TEST_AND_SET.
* src/atomic_ops/sysdeps/gcc/mips.h (AO_T_IS_INT): Likewise.
* src/atomic_ops/sysdeps/gcc/nios2.h (AO_T_IS_INT): Do not define.

Fix AO_TS_VAL_t used for __atomic_test_and_set (gcc)

* src/atomic_ops/sysdeps/gcc/aarch64.h (AO_GCC_ATOMIC_TEST_AND_SET):
Remove.
* src/atomic_ops/sysdeps/gcc/mips.h [!AO_DISABLE_GCC_ATOMICS]
(AO_GCC_ATOMIC_TEST_AND_SET): Likewise.
* src/atomic_ops/sysdeps/gcc/nios2.h (AO_GCC_ATOMIC_TEST_AND_SET):
Likewise.
* src/atomic_ops/sysdeps/test_and_set_t_is_ao_t.h (AO_TS_SET_TRUEVAL):
Likewise.
* src/atomic_ops/sysdeps/gcc/aarch64.h: Remove include
test_and_set_t_is_ao_t.h file.
* src/atomic_ops/sysdeps/gcc/mips.h [!AO_DISABLE_GCC_ATOMICS]: Likewise.
* src/atomic_ops/sysdeps/gcc/nios2.h: Likewise.
* src/atomic_ops/sysdeps/gcc/arm.h: Include test_and_set_t_is_ao_t.h
only if not AO_GCC_ATOMIC_TEST_AND_SET.
* src/atomic_ops/sysdeps/gcc/generic.h (AO_GCC_ATOMIC_TEST_AND_SET):
Define macro.
* src/atomic_ops/sysdeps/gcc/generic.h: Include
test_and_set_t_is_char.h file.
* src/atomic_ops/sysdeps/test_and_set_t_is_ao_t.h (AO_TS_val): Define
AO_TS_set to 1; update comment.

Fix typo in gcc/arm.h (ARMv6)

* src/atomic_ops/sysdeps/gcc/arm.h (AO_SKIPATOMIC_ANY_and_ANY): Fix
CPU architecture version in comment (ARMv6).

Avoid __atomic_and/or/xor_fetch if unsupported (clang/arm-v5te)

* src/atomic_ops/sysdeps/gcc/arm.h (AO_SKIPATOMIC_ANY_and_ANY,
AO_SKIPATOMIC_ANY_or_ANY, AO_SKIPATOMIC_ANY_xor_ANY): Define new
internal macro (before include "generic.h") if
AO_GCC_ATOMIC_TEST_AND_SET and __clang__, and not AO_ARM_HAVE_LDREX.
* src/atomic_ops/sysdeps/gcc/generic-arithm.h: Regenerate.
* src/atomic_ops/sysdeps/gcc/generic-arithm.template
(AO_XSIZE_and_XBAR): Do not define if AO_SKIPATOMIC_ANY_and_ANY.
* src/atomic_ops/sysdeps/gcc/generic-arithm.template
(AO_XSIZE_or_XBAR): Do not define if AO_SKIPATOMIC_ANY_or_ANY.
* src/atomic_ops/sysdeps/gcc/generic-arithm.template
(AO_XSIZE_xor_XBAR): Do not define if AO_SKIPATOMIC_ANY_xor_ANY.

Use GCC atomic intrinsics for ARM (gcc 4.8+ and clang 3.5+)

* src/atomic_ops/sysdeps/gcc/arm.h (AO_GCC_ATOMIC_TEST_AND_SET): Define
if gcc 4.8+ or clang 3.5+ or AO_PREFER_BUILTIN_ATOMICS unless
AO_DISABLE_GCC_ATOMICS.
* src/atomic_ops/sysdeps/gcc/arm.h (AO_nop_write, AO_store,
AO_char_store, AO_short_store): Do not define (in assembly code) if
AO_PREFER_BUILTIN_ATOMICS.
* src/atomic_ops/sysdeps/gcc/arm.h (AO_SKIPATOMIC_store,
AO_SKIPATOMIC_store_release, AO_SKIPATOMIC_char_store,
AO_SKIPATOMIC_char_store_release, AO_SKIPATOMIC_short_store,
AO_SKIPATOMIC_short_store_release, AO_SKIPATOMIC_int_store,
AO_SKIPATOMIC_int_store_release): Define if AO_BROKEN_TASKSWITCH_CLREX.
* src/atomic_ops/sysdeps/gcc/arm.h (AO_nop_full, AO_test_and_set,
AO_fetch_and_add, AO_fetch_and_add1, AO_fetch_and_sub1, AO_and, AO_or,
AO_xor, AO_char_fetch_and_add, AO_short_fetch_and_add,
AO_compare_and_swap, AO_fetch_compare_and_swap, AO_double_load,
AO_double_store, AO_double_compare_and_swap, AO_test_and_set_full): Do
not define (in assembly code) if AO_GCC_ATOMIC_TEST_AND_SET.
* src/atomic_ops/sysdeps/gcc/arm.h: Do not include atomic_store.h,
all_atomic_only_load.h, char_atomic_store.h, short_atomic_store.h,
all_aligned_atomic_load_store.h if AO_GCC_ATOMIC_TEST_AND_SET.
* src/atomic_ops/sysdeps/gcc/arm.h: Include generic.h (at the end of
the file) if AO_GCC_ATOMIC_TEST_AND_SET.
* src/atomic_ops/sysdeps/gcc/generic-small.h: Regenerate.
* src/atomic_ops/sysdeps/gcc/generic-small.template (AO_XSIZE_store):
Do not define if AO_SKIPATOMIC_XSIZE_store.
* src/atomic_ops/sysdeps/gcc/generic-small.template
(AO_XSIZE_store_release): Do not define if
AO_SKIPATOMIC_XSIZE_store_release.

Use GCC atomic intrinsics for MIPS (GCC 4.9+ and clang 3.5+)

* src/atomic_ops/sysdeps/gcc/mips.h: Include generic.h and do not
include all_aligned_atomic_load_store.h if AO_PREFER_BUILTIN_ATOMICS or
GCC 4.9+ or clang 3.5+ unless AO_DISABLE_GCC_ATOMICS.
* src/atomic_ops/sysdeps/gcc/mips.h (AO_MIPS_SET_ISA, AO_MIPS_LL_1,
AO_MIPS_SC, AO_MIPS_LL, AO_nop_full, AO_fetch_and_add, AO_test_and_set,
AO_compare_and_swap, AO_fetch_compare_and_swap): Do not define if
generic.h included.

Implement CAS_acquire/release/full using __atomic_compare_exchange_n (gcc)

* src/atomic_ops/sysdeps/gcc/generic-small.h: Regenerate.
* src/atomic_ops/sysdeps/gcc/generic-small.template
(AO_XSIZE_fetch_compare_and_swap, AO_XSIZE_compare_and_swap): Use
__atomic_compare_exchange_n(RELAXED) instead of
__sync_val/bool_compare_and_swap.
* src/atomic_ops/sysdeps/gcc/generic.h (AO_double_compare_and_swap):
Likewise.
* src/atomic_ops/sysdeps/gcc/generic-small.template
[AO_GCC_HAVE_XSIZE_SYNC_CAS] (AO_XSIZE_fetch_compare_and_swap_acquire,
AO_XSIZE_fetch_compare_and_swap_release,
AO_XSIZE_fetch_compare_and_swap_full): New inline function; remove
TODO item.
* src/atomic_ops/sysdeps/gcc/generic-small.template
[AO_GCC_HAVE_XSIZE_SYNC_CAS && !AO_GENERALIZE_ASM_BOOL_CAS]
(AO_XSIZE_compare_and_swap_acquire, AO_XSIZE_compare_and_swap_release,
AO_XSIZE_compare_and_swap_full): Likewise.
* src/atomic_ops/sysdeps/gcc/generic.h [AO_GCC_HAVE_double_SYNC_CAS]
(AO_double_compare_and_swap_acquire,
AO_double_compare_and_swap_release, AO_double_compare_and_swap_full):
Likewise.
* src/atomic_ops/sysdeps/gcc/generic.h (AO_compare_and_swap_acquire):
Reformat code.

Avoid atomic_compare_exchange_n if no __GCC_HAVE_SYNC_COMPARE_AND_SWAP_n

* src/atomic_ops/sysdeps/gcc/aarch64.h (AO_GCC_FORCE_HAVE_CAS,
AO_GCC_HAVE_double_SYNC_CAS): Define macro before include generic.h
if __clang__ (workaround).
* src/atomic_ops/sysdeps/gcc/generic-small.h: Regenerate.
* src/atomic_ops/sysdeps/gcc/generic-small.template
(AO_XSIZE_fetch_compare_and_swap, AO_XSIZE_compare_and_swap): Do not
define unless AO_GCC_HAVE_XSIZE_SYNC_CAS.
* src/atomic_ops/sysdeps/gcc/generic.h (AO_GCC_HAVE_char_SYNC_CAS,
AO_GCC_HAVE_short_SYNC_CAS, AO_GCC_HAVE_int_SYNC_CAS,
AO_GCC_HAVE_SYNC_CAS): New internal macro (based on
__GCC_HAVE_SYNC_COMPARE_AND_SWAP_<n> or AO_GCC_FORCE_HAVE_CAS presence).
* src/atomic_ops/sysdeps/gcc/generic.h (AO_GCC_HAVE_double_SYNC_CAS):
New internal macro if AO_HAVE_DOUBLE_PTR_STORAGE.
* src/atomic_ops/sysdeps/gcc/generic.h (AO_double_compare_and_swap):
Check AO_GCC_HAVE_double_SYNC_CAS instead of AO_HAVE_DOUBLE_PTR_STORAGE.

Eliminate redundant lwsync 2nd call in CAS_full on fail (gcc/PowerPC)

* src/atomic_ops/sysdeps/gcc/powerpc.h (AO_compare_and_swap_full,
AO_fetch_compare_and_swap_full): Do not call AO_lwsync 2nd time if
CAS is not successful.

Define AO_TS_SET as __GCC_ATOMIC_TEST_AND_SET_TRUEVAL if applicable

* src/atomic_ops/sysdeps/gcc/aarch64.h (AO_GCC_ATOMIC_TEST_AND_SET):
Define (before include test_and_set_t_is_ao_t.h).
* src/atomic_ops/sysdeps/gcc/nios2.h (AO_GCC_ATOMIC_TEST_AND_SET):
Likewise.
* src/atomic_ops/sysdeps/test_and_set_t_is_ao_t.h: Refine comment.
* src/atomic_ops/sysdeps/test_and_set_t_is_char.h: Likewise.
* src/atomic_ops/sysdeps/test_and_set_t_is_ao_t.h (AO_TS_SET_TRUEVAL):
New internal macro (defined via __GCC_ATOMIC_TEST_AND_SET_TRUEVAL).
* src/atomic_ops/sysdeps/test_and_set_t_is_char.h (AO_TS_SET_TRUEVAL):
Likewise.
* src/atomic_ops/sysdeps/test_and_set_t_is_ao_t.h (AO_TS_val): Use
AO_TS_SET_TRUEVAL instead of 1.
* src/atomic_ops/sysdeps/test_and_set_t_is_char.h (AO_BYTE_TS_val):
Use AO_TS_SET_TRUEVAL instead of 0xff; reformat code.
* src/atomic_ops/sysdeps/test_and_set_t_is_char.h (AO_TS_t): Move down
(to be after AO_TS_SET).

New macro AO_PREFER_BUILTIN_ATOMICS to rely on C11 atomics fully (AArch64)

If AO_PREFER_BUILTIN_ATOMICS is defined then inline assembly
implementation is not used.

* src/atomic_ops/sysdeps/gcc/aarch64.h (AO_SKIPATOMIC_double_load,
AO_SKIPATOMIC_double_load_acquire): Define if AO_PREFER_BUILTIN_ATOMICS.
* src/atomic_ops/sysdeps/gcc/aarch64.h (AO_nop_write, AO_double_load,
AO_double_load_acquire, AO_double_store, AO_double_store_release,
AO_double_compare_and_swap, AO_double_compare_and_swap_acquire,
AO_double_compare_and_swap_release, AO_double_compare_and_swap_full):
Do not define if AO_PREFER_BUILTIN_ATOMICS.
* src/atomic_ops/sysdeps/gcc/aarch64.h (AO_nop_write): Add comment;
remove TODO.
* src/atomic_ops/sysdeps/gcc/generic.h: Remove TODO about including
this header for other targets.
* src/atomic_ops/sysdeps/gcc/generic.h (AO_double_load): Do not define
if AO_SKIPATOMIC_double_load.
* src/atomic_ops/sysdeps/gcc/generic.h (AO_double_load_acquire): Do not
define if AO_SKIPATOMIC_double_load_acquire.

Remove obsolete information from README about C++0x standard future

* doc/README.txt (Future directions): Remove.

Update ChangeLog file

Update ChangeLog file (v7.4 changes)

Update ChangeLog file
(v7.2 - v7.4 changes only)

Update AUTHORS file

Add initial nios2 architecture support

* src/Makefile.am (nobase_private_HEADERS): Add nios2.h.
* src/atomic_ops.h: Include nios2.h if __nios2__.
* src/atomic_ops/sysdeps/gcc/nios2.h: New file.

Update AUTHORS file

Initial ibmc/powerpc (xlc) support

* src/atomic_ops/sysdeps/ibmc/powerpc.h: Include
test_and_set_t_is_ao_t.h.
* src/atomic_ops/sysdeps/ibmc/powerpc.h (AO_test_and_set,
AO_fetch_compare_and_swap): Implement.

Eliminate 'signed-to-unsigned value extension' compiler warning in AO_malloc

* src/atomic_ops_malloc.c (msbs): Change type from int to unsigned
char.
* src/atomic_ops_malloc.c (msb): Change return type from int to
unsigned.
* src/atomic_ops_malloc.c (msb, AO_malloc): Change type of v, result,
log_sz local variables from int to unsigned.

Support NaCl/arm

* src/atomic_ops/sysdeps/gcc/arm.h (AO_MASK_PTR, AO_BR_ALIGN): New
macro (empty unless __native_client__).
* src/atomic_ops/sysdeps/gcc/arm.h (AO_THUMB_GO_ARM,
AO_THUMB_RESTORE_MODE, AO_store, AO_char_store, AO_short_store,
AO_test_and_set, AO_fetch_and_add, AO_fetch_and_add1,
AO_fetch_and_sub1, AO_and, AO_or, AO_xor, AO_char_fetch_and_add,
AO_short_fetch_and_add, AO_compare_and_swap,
AO_fetch_compare_and_swap): Insert AO_BR_ALIGN after label.
* src/atomic_ops/sysdeps/gcc/arm.h (AO_store, AO_char_store,
AO_short_store, AO_test_and_set, AO_fetch_and_add, AO_fetch_and_add1,
AO_fetch_and_sub1, AO_and, AO_or, AO_xor, AO_char_fetch_and_add,
AO_short_fetch_and_add, AO_compare_and_swap, AO_fetch_compare_and_swap,
AO_double_load, AO_double_store, AO_double_compare_and_swap,
AO_test_and_set_full): Insert AO_MASK_PTR before each pointer access.

Remove TODO file (items moved to Issues on Github)

Fix GCC 5.x compatibility for AArch64 double-wide primitives

Small change to make aarch64 support work with gcc 5.x. Otherwise it
demands gcc -latomic and still fails test_stack.

* src/atomic_ops/sysdeps/gcc/aarch64.h (AO_double_load,
AO_double_load_acquire, AO_double_store, AO_double_store_release,
AO_double_compare_and_swap, AO_double_compare_and_swap_acquire,
AO_double_compare_and_swap_release, AO_double_compare_and_swap_full):
Use assembly implementation even for GCC v5+ (not just GCC 4.x).

New configure option (--enable-werror) to treat warnings as compiler errors

* configure.ac (werror): Test --enable-werror option to add -Werror
to CFLAGS.

Update AUTHORS file

Support n32 ABI for mips64

Without the proposed change, the existing preprocessor checks for
mips64 support do not account for the n32 ABI (when building with
"gcc -mabi=n32", test_atomic and test_stack both fail, and
test_malloc appears to hang indefinitely while spinning at 100%).

* src/atomic_ops/sysdeps/gcc/mips.h (AO_MIPS_SET_ISA, AO_MIPS_LL_1,
AO_MIPS_SC): Define depending on _MIPS_SIM value.

Update ChangeLog file

Update ChangeLog file
(v7.2 - v7.4 changes only)

Update AUTHORS file

Update AUTHORS file

Minor fix of code alignment in mips AO_compare_and_swap

Remove inclusion of acquire_release_volatile.h on mips

I'm not entirely sure how this ended up here. It might have been the case
that MIPS processors used to do this, but the ISA manuals don't say anything
about volatile loads / stores having aquire / release semnatics, so just
remove it to be safe.

Use LLD and SCD instructions on mips64

Update AUTHORS file

Relax shareability domain for dmb st in AO_nop_write (ARM/AArch64)

* src/atomic_ops/sysdeps/gcc/aarch64.h (AO_nop_write): Replace "dmb st"
to "dmb ishst" (this way the barriers will occupy the inner shareable
domain).
* src/atomic_ops/sysdeps/gcc/arm.h (AO_nop_write): Likewise.

Fix missing output folder on making auto-generated test files (Automake)

* tests/Makefile.am (test_atomic_include.h, list_atomic.c,
list_atomic.i): Add mkdir for output folder.

Update AUTHORS file

Fix missing output folder on making auto-generated headers (Automake)

Create the directories before sed needs them (otherwise build fails
when sed tries to redirect output to a non-existent directory in case
of build root folder is not identical to source root folder).

* src/Makefile.am (atomic_ops/generalize-small.h,
atomic_ops/generalize-arithm.h, atomic_ops/sysdeps/ao_t_is_int.h,
atomic_ops/sysdeps/gcc/generic-arithm.h,
atomic_ops/sysdeps/loadstore/*.h): Add mkdir for output folder.

Eliminate 'variable set but not used' Cppcheck warnings in test_stack

* tests/test_stack.c (run_one_test): Define "j" local variable only
if VERBOSE.
* tests/test_stack.c (main): Do not define "sum" local variable (and
don not compute the sum) if NO_TIMES.

Fix missing casts to match printf format specifier in test_atomic

* tests/test_atomic.c (test_and_set_thr): Add missing casts to long
for locked_counter (which is unsigned long) to match printf format
specifier.

.gitignore: Ignore .dirstamp

.gitignore: Ignore tests/.libs (generated if configure --enable-shared)

Fix makefile preventing AO_pause undefined in libatomic_ops_gpl

* src/Makefile.am (libatomic_ops_gpl_la_LIBADD): New dependency.

Restore contribution info in ChangeLog for authors not listed in git log
(deleted in commit 36a9c66)

* ChangeLog (7.0, 1.0): Add information about contribution of persons
mentioned in AUTHORS but not recorded in git log.
* src/atomic_ops/sysdeps/gcc/cris.h: Move contribution information
from comment to ChangeLog.

Update ChangeLog file

Merge pull request #8 from badboy/patch-1

Fix a typo in doc/README.txt (remove redundant "an" article)

Removed unnecessary "an"

Update emails/links due to project site transition

* AUTHORS: Update email.
* README.md: Update links to BDWGC/libatomic_ops site.
* doc/README_stack.txt: Likewise.
* README.md: Update mailing list info.
* configure.ac: Likewise.

Bump atomic_ops version

* README.md: Bump version to 7.5.0.
* configure.ac: Likewise.
* src/atomic_ops/ao_version.h (AO_VERSION_MINOR): Likewise.

[7.4.0]

Bump version to 7.4.0; change policy regarding version numbers

* ChangeLog: Update.
* README.md: Bump version.
* configure.ac (AC_INIT): Likewise.
* src/atomic_ops/ao_version.h (AO_VERSION_MINOR): Likewise.
* src/atomic_ops/ao_version.h (AO_VERSION_ALPHA): Replace to
AO_VERSION_MICRO; add comment.

Put README.md to 'dist' package (Automake)

* Makefile.am (dist_pkgdata_DATA): Add README.md item.

Update ChangeLog file

Convert README to Markdown format

* README: Rename to README.md; adjust formatting to follow Markdown
syntax.

Remove broken link to INSTALL file from README

* README (Installation and Usage): Remove reference to INSTALL file
(not generated by autoreconf as AM_INIT_AUTOMAKE specifies "foreign"
strictness).
* .gitignore (INSTALL): Remove.

Put autogen.sh to 'dist' package (Automake)

* Makefile.am (EXTRA_DIST): Add "autogen.sh" item.

.gitignore: Ignore test-driver (generated by autoreconf)

.gitignore: Ignore test*.log, test*.trs
(Apply commit 5cce9c5 from 'release-7_2' branch.)

Conflicts:

    .gitignore

Update ChangeLog file

Do not use LDREXD/STREXD for Clang3.2/arm (and earlier)

* src/atomic_ops/sysdeps/gcc/arm.h (AO_ARM_HAVE_LDREXD): Do not define
for pre-Clang3.3 (since it does not allocate register pairs for
LDREXD/STREXD instructions properly); add comment.

Fix ARM char/short fetch_and_add and double-CAS operands width (GCC/Clang)

* src/atomic_ops/sysdeps/gcc/arm.h (AO_char_fetch_and_add,
AO_short_fetch_and_add): Use 32-bit int type for "tmp" and "result"
local variables instead of char/short type (resolve Clang3.3 warning
"size being stored is truncated, use a modifier to specify the size"
enabled by -Wasm-operand-widths compiler option); cast "incr"
argument to int to prevent Clang3.2 warning about value
truncation.
* src/atomic_ops/sysdeps/gcc/arm.h (AO_double_compare_and_swap): Swap
assembly code operands ("new_val.AO_whole" and "addr") to prevent
Clang3.3 warning about operand truncation.

Fix ARMv7 LDREXD/STREXD double-wide operand specification (GCC/Clang)

* src/atomic_ops/sysdeps/gcc/arm.h (AO_double_load, AO_double_store,
AO_double_compare_and_swap): Specify that LDREXD and STREXD use 2
adjacent registers (thus preventing Clang3.3 from register allocation
failures leading to "registers may not be the same" or
"even register required" GAS errors).

Tests: workaround GCC 4.4.3 warning reported for list_atomic.c 'val'

* tests/list_atomic.template (XSIZE_list_atomicXX): Use "static"
modifier for "val" local variable to initialize it (cannot use direct
assignment to zero because "val" type could be a SIMD vector type if
XCTYPE is AO_double_t) to workaround GCC v4.4.3
"'val' is used uninitialized in this function" warning reported for
AO_load.

Support ARMv8 target (gcc/arm)

* src/atomic_ops/sysdeps/gcc/arm.h (__ARM_ARCH_8A__): Detect new macro
(treated same as __ARM_ARCH_7A__).
* src/atomic_ops/sysdeps/gcc/arm.h (AO_ARM_HAVE_SWP): Do not define
for ARMv8 (since SWP{B} obsoleted); add comment.
* src/atomic_ops/sysdeps/gcc/arm.h (AO_compare_and_swap): Add TODO
item (for deprecated IT block containing wide Thumb instruction).

tests: Fix makefile sed rule for list_atomic

* tests/Makefile.am (test_atomic_include.h, list_atomic.c): Replace
all occurrences of 'XX' (instead of only the first one) on every line.

tests: Add char/short/int/AO_double_t and dd_acquire cases to list_atomic

* tests/Makefile.am (list_atomic.c): Iterate over XSIZE/XCTYPE (in
addition to XX); expand XX also as _dd_acquire_read.
* tests/list_atomic.template (XSIZE_list_atomicXX): Define 'val' local
variable only if used (needed for AO_double_t case).

tests: Add and/or/xor entries to list_atomic

* tests/list_atomic.template (list_atomicXX): Add AO_XSIZE_andXX,
AO_XSIZE_orXX, AO_XSIZE_xorXX invocations.

tests: Parameterize list_atomic template with XSIZE

* tests/Makefile.am (list_atomic.c): Substitute XSIZE/XCTYPE for AO_t.
* tests/list_atomic.template (list_atomicXX): Parameterize with XSIZE
and XCTYPE (except for AO_nop and AO_test_and_set).

list_atomic: Add makefile rule to test list_atomic.template syntax

* tests/Makefile.am (BUILT_SOURCES, CLEANFILES): Add "list_atomic.o".
* tests/Makefile.am (list_atomic.o): New rule (to verify list_atomic.c
is valid C code).
* tests/list_atomic.template (list_atomicXX): Use "volatile" for "val"
local variable.
* tests/list_atomic.template (list_atomicXX): Define "oldval", "newval",
"ts" and "incr" local variables only if used; cast string literals to
void (to prevent compiler warnings).
* tests/list_atomic.template (list_atomicXX): Use AO_t type for "incr"
local variable instead of C long type.
* tests/list_atomic.template (list_atomicXX): Define "oldval",
"newval", "incr" as statitc local variables, and remove explicit
initialization to zero (to void problems with initialization of these
variables for AO_double_t case if the latter is a struct).

tests: Do not use deprecated AO_T and AO_TS_T

* tests/list_atomic.template (list_atomicXX): Use AO_t instead of
deprecated AO_T.
* tests/list_atomic.template (list_atomicXX): Use AO_TS_t instead of
deprecated AO_TS_T.
* tests/test_atomic.c (lock): Likewise.

Fix typo in comment of generalize-small.template

* src/atomic_ops/generalize-arithm.template: Fix a typo in comment
("acquire").
* src/atomic_ops/generalize-arithm.h: Regenerate.

Add comment about store_full implementation for x86

* src/atomic_ops/sysdeps/gcc/x86.h: Add comment about AO_store_full
generalization.

Add non-generalized double-CAS-full implementation for AArch64

* src/atomic_ops/sysdeps/gcc/aarch64.h
(AO_double_compare_and_swap_full): New function.

Define AO_NO_PTHREADS in configure if no pthreads (Win32 and VxWorks)

* configure.ac (have_pthreads): Do not define to true if check for
pthread_self failed.
* configure.ac (AO_NO_PTHREADS): Define if not have_pthreads.

Better document configure THREADDLLIBS variable

* configure.ac (THREADDLLIBS, have_pthreads): Add comments.

Update AUTHORS

Enable build using toolchain without pthreads

* src/atomic_ops.c: Include pthread.h only if not AO_NO_PTHREADS (new
macro).
* src/atomic_ops.c (AO_pt_lock): Define only unless AO_NO_PTHREADS.
* tests/test_atomic.c (main): Skip test_atomic_pthreads if both
AO_NO_PTHREADS and AO_USE_PTHREAD_DEFS are defined (preventing test
link failure if AO_NO_PTHREADS passed via CFLAGS).

Add comment about double-wide load/store on x86_64 (GCC)

* src/atomic_ops/sysdeps/gcc/x86.h: Add comment about AO_double_load
and AO_double_store implementation in 64-bit mode; remove the
corresponding TODO item.