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.

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
(Apply commit 22ca163 from 'master' branch.)

Conflicts:

    src/atomic_ops/sysdeps/gcc/mips.h

Remove inclusion of acquire_release_volatile.h on mips
(Apply commit 0f838de from 'master' branch, fix typos in commit message.)

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 acquire / release semantics, so just
remove it to be safe.

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.

[7.4.2]

Bump libatomic_ops version to 7.4.2

* README.md: Bump version.
* configure.ac (AC_INIT): Likewise.
* src/atomic_ops/ao_version.h (AO_VERSION_MICRO): Likewise.

Update ChangeLog file

Fix a typo in doc/README.txt (remove redundant "an" article)
(Apply commit 50beacd from 'master' branch.)

Update emails/links due to project site transition
(Apply commit 686c70b from 'master' branch.)

* 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.

Conflicts:

    configure.ac

[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.

Fix generalized store_release_write for double-wide type on x64 (GCC)

* src/atomic_ops/generalize-small.template
(AO_XSIZE_store_release_write): Move store-write-based definition down
to follow AO_XSIZE_store_write one (since AO_double_store is currently
defined via CAS for gcc/x64).
* src/atomic_ops/generalize-small.h: Regenerate.

Update AUTHORS

Fix AM_CONFIG_HEADER in configure for autoconf-2.69-1

* configure.ac (AM_CONFIG_HEADER): Replace obsolete macro with with
AC_CONFIG_HEADERS one.

Generalize double_load/store for x86_64 (GCC)

* src/atomic_ops.h (AO_GENERALIZE_TWICE): Define in case of missing
double-wide load or store primitives while double-wide CAS is present
(required for x86-64, at least).

Fix fetch_compare_and_swap asm constraints in gcc/x86.h

* src/atomic_ops/sysdeps/gcc/x86.h (AO_fetch_compare_and_swap_full):
Use same asm constraints for old_val and new_val as in
AO_compare_and_swap_full.

Reformat asm instructions of sunc/x86.h

* src/atomic_ops/sysdeps/sunc/x86.h (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_compare_and_swap_full): Reformat code.

Fix asm constraints of primitives in sunc/x86.h

* src/atomic_ops/sysdeps/sunc/x86.h (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_compare_double_and_swap_double_full,
AO_int_fetch_and_add_full): Use "+m" asm constraint for *addr instead
of "=m" (because the value pointed by addr is read and written by the
code).
* src/atomic_ops/sysdeps/sunc/x86.h (AO_fetch_compare_and_swap_full):
Use same asm constraints and parameters order as in
AO_compare_and_swap_full.

Merge branch 'add-aarch64-support'

Fix asm constraint of CAS memory operand for gcc/alpha

* src/atomic_ops/sysdeps/gcc/alpha.h (AO_compare_and_swap): Use "+m"
asm constraint for *addr instead of "=m" (because the value pointed by
addr is read and written by the code).

Fix asm constraint of fetch_and_add, test_and_set, fetch_CAS for MIPS (gcc)

* src/atomic_ops/sysdeps/gcc/mips.h (AO_fetch_and_add,
AO_test_and_set, AO_fetch_compare_and_swap): Use "+m" asm constraint
for *addr instead of "=m" (because the value pointed by addr is read
and written by the code).

Fix asm constraint of compare_and_swap for clang-3.1/mips

* src/atomic_ops/sysdeps/gcc/mips.h (AO_compare_and_swap): Use "+m"
asm constraint for *addr instead of "+R" (the letter is unsupported
by clang3.1 resulting in "invalid output constraint in asm" error).

Always use 'mfence' for nop_full if target CPU supports SSE2 (gcc/x86)

* src/atomic_ops/sysdeps/gcc/x86.h (AO_USE_PENTIUM4_INSTRS): Define
if __SSE2__ is defined; update comment (and remove TODO item).

Fix assembly comment prefix and identify memory clobbers for AArch64

* src/atomic_ops/sysdeps/gcc/aarch64.h: Revert comments beginning
marker to '//' (since '@' is not supported for A64 assembler).
* src/atomic_ops/sysdeps/gcc/aarch64.h (AO_double_load): Add comment
about the need for STXP instruction; remove TODO item.
* src/atomic_ops/sysdeps/gcc/aarch64.h (AO_double_store): Add comment
about absence of "cc" in clobber lists; remove TODO item.
* 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): Use Q constraint (instead of "r")
for 'addr' argument to instruct the compiler about memory clobbers.

Use AO_EXPECT_FALSE for AArch64 double_load/store

* src/atomic_ops/sysdeps/gcc/aarch64.h (AO_HAVE_DOUBLE_PTR_STORAGE):
Do not check (since defined in standard_ao_double_t.h for AArch64).
* src/atomic_ops/sysdeps/gcc/aarch64.h (AO_double_load): Add TODO
items.
* src/atomic_ops/sysdeps/gcc/aarch64.h (AO_double_load,
AO_double_load_acquire, AO_double_store, AO_double_store_release):
Use AO_EXPECT_FALSE.

Workaround missing built-in double-wide primitives for AArch64 in gcc-4.7

* 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): Define using inline assembly
(because GCC 4.7-2013.01 has no support of 16-byte atomic operations).
* src/atomic_ops/sysdeps/gcc/generic.h (AO_double_load,
AO_double_load_acquire, AO_double_store, AO_double_store_release,
AO_double_compare_and_swap): Do not define if the corresponding
AO_HAVE_double_X macro is defined.

gcc/x86.h: Add TODO items

Merge remote-tracking branch 'origin/master' into add-aarch64-support

Minimize gcc/generic-arithm template by factoring out barriers
(code refactoring)

* src/Makefile.am (atomic_ops/sysdeps/gcc/generic-arithm.h): Iterate
over XBAR/XGCCBAR (in addition to XSIZE/XCTYPE).
* src/atomic_ops/sysdeps/gcc/generic-arithm.template: Parametrize all
primitives with XBAR (replacing AO none/acquire/release/full barriers)
and with XGCCBAR (replacing GCC atomic RELAXED/ACQUIRE/RELEASE/SEQ_CST
barriers, respectively).
* src/atomic_ops/sysdeps/gcc/generic-arithm.h: Regenerate.

Implement char/short/int-wide primitives using GCC built-in atomic/sync

* src/Makefile.am (EXTRA_DIST): Add gcc/generic-arithm.template,
gcc/generic-small.template entries.
* src/Makefile.am (nobase_private_HEADERS): Move gcc/generic-arithm.h,
atomic_ops/sysdeps/gcc/generic-small.h to BUILT_SOURCES.
* src/Makefile.am (atomic_ops/sysdeps/gcc/generic-arithm.h,
atomic_ops/sysdeps/gcc/generic-small.h): New rules (to generate
AO_char/short/int_X primitives included from gcc/generic.h file.
* src/atomic_ops/sysdeps/gcc/generic-arithm.template: New template
file (based on code moved from generic-arithm.h).
* src/atomic_ops/sysdeps/gcc/generic-small.template: New template file
(based on code moved from generic-small.h).
* src/atomic_ops/sysdeps/gcc/generic-arithm.h: Regenerate.
* src/atomic_ops/sysdeps/gcc/generic-small.h: Likewise.

Move gcc-generic AO_t-wide primitives to generic-small/arithm headers
(code refactoring)

* src/atomic_ops/sysdeps/gcc/generic-small.h: New file.
* src/atomic_ops/sysdeps/gcc/generic-arithm.h: Likewise.
* src/atomic_ops/sysdeps/gcc/generic.h: Include generic-small.h file.
* src/atomic_ops/sysdeps/gcc/generic.h (AO_load, AO_load_acquire,
AO_store, AO_store_release, AO_fetch_compare_and_swap,
AO_compare_and_swap): Move to generic-small.h file.
* src/atomic_ops/sysdeps/gcc/generic.h: Include generic-arithm.h file
unless AO_PREFER_GENERALIZED.
* src/atomic_ops/sysdeps/gcc/generic.h (AO_fetch_and_add,
AO_fetch_and_add_acquire, AO_fetch_and_add_release,
AO_fetch_and_add_full, AO_and, AO_and_acquire, AO_and_release,
AO_and_full, AO_or, AO_or_acquire, AO_or_release, AO_or_full, AO_xor,
AO_xor_acquire, AO_xor_release, AO_xor_full): Move to generic-arithm.h
file.
* src/Makefile.am (nobase_private_HEADERS): Add gcc/generic-arithm.h,
gcc/generic-small.h entries.

Define nop_write as 'dmb st' for AArch64

* src/atomic_ops/sysdeps/gcc/aarch64.h (AO_nop_write): Define via asm
(dmb st) statement unless AO_UNIPROCESSOR (because it seems there is
no equivalent definition using compiler __atomic_thread_fence).
* src/atomic_ops/sysdeps/gcc/generic.h (AO_nop_write): Do not define
if already is.

Fix AO_double_t definition for AArch64

* src/atomic_ops/sysdeps/standard_ao_double_t.h (double_ptr_storage):
Define explicitly for AArch64 (use __int128 instead of long long).

Fix double_compare_and_swap compile-time error in gcc/generic.h

* src/atomic_ops/sysdeps/gcc/generic.h (AO_double_compare_and_swap):
Fix access to old_val value.

Remove improper comment for AO_XSIZE_load_read

* src/atomic_ops/generalize-small.template (AO_XSIZE_load_read):
Remove improper comment (because nop barrier type matches that of
load primitive).
* src/atomic_ops/generalize-small.template (AO_XSIZE_store_write):
Reorder AO_HAVE_nop_write and AO_HAVE_XSIZE_store checking (to match
that for other primitives in this file).
* src/atomic_ops/generalize-small.h: Regenerate.

Implement AO_and/or/xor efficiently for ARM

* src/atomic_ops/sysdeps/gcc/arm.h (AO_and, AO_or, AO_xor): Implement
directly using LDREX/STREX (enabled only if not AO_PREFER_GENERALIZED).

Add compile-time assertion for size of 'standard' AO_double_t

* src/atomic_ops/sysdeps/standard_ao_double_t.h
(AO_double_t_size_static_assert): Add compile-time assertion for
AO_double_t size.

Fix (remove) invalid include of read_ordered.h for ARM
(fix commit 2df9c1e partially)

* src/atomic_ops/sysdeps/gcc/arm.h: Do not include read_ordered.h
(because load_acquire should contain a DMB instruction in a multi-core
case, new load_acquire/read primitives implementation is generalized
using nop_full/read which either contain a DMB instruction, or is just
a compiler barrier for uniprocessor).
* src/atomic_ops/sysdeps/armcc/arm_v6.h: Likewise.
* src/atomic_ops/sysdeps/msftc/arm.h: Likewise.

Revert "Fix read_ordered.h inclusion for ARM"
(because it makes load_acquire/read incorrect for multi-core ARM)

This reverts commit fcc838be49c98486c26738764f895d34de0716be.

Implement load/store via simple LDR/STR for ARMv6+ (msftc)

* src/atomic_ops/sysdeps/msftc/arm.h: Include
all_aligned_atomic_load_store.h instead of all_atomic_load_store.h
(since unaligned accesses are not guaranteed to be atomic).
* src/atomic_ops/sysdeps/msftc/arm.h (AO_load): Remove; include
all_aligned_atomic_load_store.h unconditionally instead (thus
implementing AO[_char/short]_load/store via simple LDR/STR; add
comment about Windows interrupt handlers.
* src/atomic_ops/sysdeps/msftc/arm.h: Add TODO item to implement
AO_test_and_set_full (for pre-ARMv6).

Define AO_nop_full as compiler barrier for pre-ARMv6 single-core case

* src/atomic_ops/sysdeps/gcc/arm.h (AO_nop_full): Define for pre-ARMv6
as well (as a compiler barrier) if AO_UNIPROCESSOR; refine comment.
* src/atomic_ops/sysdeps/msftc/arm.h (AO_nop_full): Likewise.
* src/atomic_ops/sysdeps/msftc/arm.h: Eliminate duplicated include of
test_and_set_t_is_ao_t.h.

Use __atomic GCC built-in to implement generic double-wide CAS

* src/atomic_ops/sysdeps/gcc/generic.h (AO_double_compare_and_swap):
Implement using __atomic_compare_exchange_n(__ATOMIC_RELAXED) instead
of __sync_bool_compare_and_swap.

TODO file: move item about sync-base primitives to aarch64.h and generic.h

Implement double-wide load/store and CAS primitives for AArch64

* src/atomic_ops/sysdeps/gcc/aarch64.h: Include standard_ao_double_t.h
(before inclusion of generic.h).
* src/atomic_ops/sysdeps/gcc/generic.h (AO_double_load,
AO_double_load_acquire, AO_double_store, AO_double_store_release,
AO_double_compare_and_swap): Implement (only if
AO_HAVE_DOUBLE_PTR_STORAGE defined).

Implement nop_read/write and and/or/xor_acquire/release/full for AArch64

* src/atomic_ops/sysdeps/gcc/generic.h (AO_nop_read, AO_nop_write,
AO_and, AO_and_acquire, AO_and_release, AO_and_full, AO_or,
AO_or_acquire, AO_or_release, AO_or_full, AO_xor, AO_xor_acquire,
AO_xor_release, AO_xor_full): Implement.
* src/atomic_ops/sysdeps/gcc/generic.h (AO_nop_full): Implement using
__atomic_thread_fence instead of __sync_synchronize.
* src/atomic_ops/sysdeps/gcc/generic.h: Add comment about AO_load_full
and AO_store_full; update TODO items.

Allow to prefer more generalized primitives in gcc/generic.h

* src/atomic_ops/sysdeps/gcc/generic.h (AO_test_and_set,
AO_test_and_set_acquire, AO_test_and_set_release, AO_test_and_set_full,
AO_fetch_and_add, AO_fetch_and_add_acquire, AO_fetch_and_add_release,
AO_fetch_and_add_full): Do not define if AO_PREFER_GENERALIZED.
* src/atomic_ops/sysdeps/gcc/generic.h (AO_compare_and_swap): Do not
define if AO_GENERALIZE_ASM_BOOL_CAS.

Move intrinsic-based primitives from gcc/aarch64.h to new gcc/generic.h
(code refactoring)

* src/Makefile.am (nobase_private_HEADERS): Add generic.h entry.
* src/atomic_ops/sysdeps/gcc/aarch64.h: Move all primitives to
generic.h; include generic.h file.
* src/atomic_ops/sysdeps/gcc/generic.h: New file.
* src/atomic_ops/sysdeps/gcc/generic.h (AO_nop_full): Add comment.

Fix AO_load_acquire for AArch64

* src/atomic_ops/sysdeps/gcc/aarch64.h: Add TODO for AO_nop_read;
uncomment AO_load_acquire definition and remove include of
read_ordered.h file (because AO_load_acquire requires "release"
barrier, AO_load_read is defined in generalize-small.h using
AO_nop_read).

Merge branch 'master' into add-aarch64-support

Remove load_read, store_write redundant definition from ordered_X.h
(code refactoring)

* src/atomic_ops/sysdeps/loadstore/ordered_loads_only.template
(AO_XSIZE_load_read): Remove prototype (since defined by
generalize-small.template in the same way).
* src/atomic_ops/sysdeps/loadstore/ordered_stores_only.template
(AO_XSIZE_store_write): Likewise.
* src/atomic_ops/sysdeps/loadstore/ordered_stores_only.template
(AO_XSIZE_store_release): Define using AO_nop_write and AO_XSIZE_store
directly.
* src/atomic_ops/sysdeps/ordered_except_wr.h: Move include of
ordered_stores_only.h down to be after AO_nop_write definition.
* src/atomic_ops/sysdeps/read_ordered.h: Move include of
ordered_loads_only.h down to be after AO_nop_read definition.
* src/atomic_ops/sysdeps/loadstore/ordered_loads_only.h: Regenerate.
* src/atomic_ops/sysdeps/loadstore/ordered_stores_only.h: Likewise.

Revert "Prevent load_acquire redefinition in ordered_loads_only.h"
(That change is not needed because the file defines really only
load_acquire, and load_read is the same as in generalize-small.h)

This reverts commit ad464bf64a139cefa8b6f6e77b5f1f5ea1c51519.

Merge branch 'add-dbl-load-store'

Add generalized fetch_and_add_acquire/release (for ARMv6+)

* src/atomic_ops/generalize-arithm.template
(AO_XSIZE_fetch_and_add_acquire, AO_XSIZE_fetch_and_add_release):
Add generalized template primitives based on AO_XSIZE_fetch_and_add.
* src/atomic_ops/generalize-arithm.h: Regenerate.

Fix unsupported instruction use in char/short_fetch_and_add for ARMv6

* src/atomic_ops/sysdeps/gcc/arm.h (AO_ARM_HAVE_LDREXBH): Define new
macro for ARMv6K/Z+ (excluding ARMv6, ARMv6J, ARMv6T2).
* src/atomic_ops/sysdeps/gcc/arm.h (AO_char_store, AO_short_store,
AO_char_fetch_and_add, AO_short_fetch_and_add): Define (together with
the corresponding AO_HAVE_x macros) only if AO_ARM_HAVE_LDREXBH (since
otherwise LDREXB/STREXB, LDREXH/STREXH are not supported by the target
processor).
* src/atomic_ops/sysdeps/gcc/arm.h: Include char_atomic_store.h and
short_atomic_store.h only if AO_HAVE_char_store is not defined (by
gcc/arm.h itself).

Implement char/short_fetch_and_add for ARMv6+ (GCC)

* src/atomic_ops/sysdeps/gcc/arm.h: Include char_atomic_store.h and
short_atomic_store.h only if not AO_BROKEN_TASKSWITCH_CLREX.
* src/atomic_ops/sysdeps/gcc/arm.h (AO_store): Update comment.
* src/atomic_ops/sysdeps/gcc/arm.h (AO_char_store, AO_short_store):
Implement using LDREXB/STREXB and LDREXH/STREXH, respectively, if
AO_BROKEN_TASKSWITCH_CLREX defined (only if AO_ARM_HAVE_LDREX).
* src/atomic_ops/sysdeps/gcc/arm.h (AO_char_fetch_and_add,
AO_short_fetch_and_add): Implement (based on using LDREXB/STREXB and
LDREXH/STREXH, respectively) if AO_ARM_HAVE_LDREX.

Adjust type of 'flag' and 'tmp' local variables in gcc/arm.h
(code refactoring)

* src/atomic_ops/sysdeps/gcc/arm.h (AO_store,
AO_fetch_compare_and_swap): Change type of "flag" local variable from
AO_t to int (only if AO_BROKEN_TASKSWITCH_CLREX).
* src/atomic_ops/sysdeps/gcc/arm.h (AO_test_and_set, AO_fetch_and_add,
AO_fetch_and_add1, AO_fetch_and_sub1): Change type of "flag" local
variable from unsigned long to int.
* src/atomic_ops/sysdeps/gcc/arm.h (AO_fetch_and_add,
AO_fetch_and_add1, AO_fetch_and_sub1): Change type of "tmp" local
variable from unsigned long to AO_t.

Implement atomic store using direct write by default on ARMv6+

* src/atomic_ops/sysdeps/gcc/arm.h (AO_store): Define only if
AO_BROKEN_TASKSWITCH_CLREX, otherwise include atomic_store.h; update
and refine comment.

Implement char/short_store primitives at aligned addresses for ARM

* src/atomic_ops/sysdeps/gcc/arm.h: Include char_atomic_store.h and
short_atomic_store.h if AO_ARM_HAVE_LDREX (after
AO_ACCESS_x_CHECK_ALIGNED defined); add comment.
* src/atomic_ops/sysdeps/gcc/arm.h: Include
all_aligned_atomic_load_store.h instead of all_atomic_load_store.h
(only if not AO_ARM_HAVE_LDREX).

.gitignore: Ignore .gch files

Implement double_store for ARMv7 using LDREXD/STREXD

* src/atomic_ops/sysdeps/gcc/arm.h (AO_nop_full, AO_nop_write,
AO_double_load, AO_double_compare_and_swap): Add comment about missing
AO_THUMB_GO_ARM.
* src/atomic_ops/sysdeps/gcc/arm.h (AO_double_load): Add comment.
* src/atomic_ops/sysdeps/gcc/arm.h (AO_double_store): New primitive
(implemented directly using LDREXD/STREXD).

Implement char/short_load primitives for ARMv6+

* src/atomic_ops/sysdeps/armcc/arm_v6.h: Include all_atomic_only_load.h
(with defined AO_ACCESS_CHECK_ALIGNED, AO_ACCESS_short_CHECK_ALIGNED
and AO_ACCESS_int_CHECK_ALIGNED).
* src/atomic_ops/sysdeps/gcc/arm.h: Likewise.
* src/atomic_ops/sysdeps/armcc/arm_v6.h (AO_load, AO_HAVE_load):
Remove (since defined by all_atomic_only_load.h).
* src/atomic_ops/sysdeps/gcc/arm.h (AO_load, AO_HAVE_load): Likewise.
* src/atomic_ops/sysdeps/gcc/arm.h: Adjust atomic_store.h filename in
comment.

Prevent load_acquire redefinition in ordered_loads_only.h

* src/atomic_ops/sysdeps/loadstore/ordered_loads_only.template
(AO_XSIZE_load_acquire, AO_HAVE_XSIZE_load_acquire): Do not define
if AO_HAVE_XSIZE_load_acquire already defined.
* src/atomic_ops/sysdeps/loadstore/ordered_loads_only.h: Regenerate.

Generalize AArch64 add1/sub1 primitives

* src/atomic_ops/sysdeps/gcc/aarch64.h (AO_fetch_and_add1,
AO_fetch_and_add1_acquire, AO_fetch_and_add1_release,
AO_fetch_and_add1_full, AO_fetch_and_sub1, AO_fetch_and_sub1_acquire,
AO_fetch_and_sub1_release, AO_fetch_and_sub1_full): Remove (since
generalized to the same expression).

Fix AO_nop_full and AO_load_read for AArch64

* src/atomic_ops/sysdeps/gcc/aarch64.h: Place include of
read_ordered.h to the end of file (to be after AO_load definition).
* src/atomic_ops/sysdeps/gcc/aarch64.h (AO_nop_full): Force compiler
barrier for the uni-processor case.
* src/atomic_ops/sysdeps/gcc/aarch64.h (AO_load_acquire): Comment out
and add FIXME (due to read_ordered.h).
* src/atomic_ops/sysdeps/gcc/aarch64.h (AO_test_and_set,
AO_test_and_set_acquire, AO_test_and_set_release,
AO_test_and_set_full): Cast result to AO_TS_VAL_t (since
__atomic_test_and_set returns AO_TS_t value).