[PATCH, ARM 7/7, ping3] Enable ARMv8-M atomic and synchronization support for ARMv8-M Baseline

Thu Oct 27 09:05:00 GMT 2016

Hi Thomas,

On 24/10/16 09:06, Thomas Preudhomme wrote:
> Ping?
>
> Best regards,
>
> Thomas
>
> On 14/10/16 14:51, Thomas Preudhomme wrote:
>> Ping?
>>
>> Best regards,
>>
>> Thomas
>>
>> On 03/10/16 17:46, Thomas Preudhomme wrote:
>>> Ping?
>>>
>>> Best regards,
>>>
>>> Thomas
>>>
>>> On 22/09/16 14:50, Thomas Preudhomme wrote:
>>>> Hi,
>>>>
>>>> This patch is part of a patch series to add support for atomic operations on
>>>> ARMv8-M Baseline targets in GCC. This specific patch enables atomic and
>>>> synchronization support added in previous patches of the series and adds tests.
>>>> Enabling is done at the end of the patch series to ensure that no ICE is seen
>>>> when in the middle of the patch series (eg. while doing a bisect). Enabling is
>>>> done by enabling the exclusive and atomic loads and stores needed to implement
>>>> all synchronization and atomic operations.
>>>>
>>>> ChangeLog entries are as follow:
>>>>
>>>> *** gcc/ChangeLog ***
>>>>
>>>> 2016-07-05  Thomas Preud'homme <thomas.preudhomme@arm.com>
>>>>
>>>>         * config/arm/arm.h (TARGET_HAVE_LDREX): Define for ARMv8-M Baseline.
>>>>         (TARGET_HAVE_LDREXBH): Likewise.
>>>>         (TARGET_HAVE_LDACQ): Likewise.
>>>>
>>>>
>>>> *** gcc/testsuite/ChangeLog ***
>>>>
>>>> 2016-07-05  Thomas Preud'homme <thomas.preudhomme@arm.com>
>>>>
>>>>         * gcc.target/arm/atomic-comp-swap-release-acquire-3.c: New test.
>>>>         * gcc.target/arm/atomic-op-acq_rel-3.c: Likewise.
>>>>         * gcc.target/arm/atomic-op-acquire-3.c: Likewise.
>>>>         * gcc.target/arm/atomic-op-char-3.c: Likewise.
>>>>         * gcc.target/arm/atomic-op-consume-3.c: Likewise.
>>>>         * gcc.target/arm/atomic-op-int-3.c: Likewise.
>>>>         * gcc.target/arm/atomic-op-relaxed-3.c: Likewise.
>>>>         * gcc.target/arm/atomic-op-release-3.c: Likewise.
>>>>         * gcc.target/arm/atomic-op-seq_cst-3.c: Likewise.
>>>>         * gcc.target/arm/atomic-op-short-3.c: Likewise.
>>>>
>>>>
>>>> Testing: No code generation difference for ARMv7-A, ARMv7VE and ARMv8-A on all
>>>> atomic and synchronization testcases in the testsuite [2]. Patchset was also
>>>> bootstrapped with --enable-itm --enable-gomp on ARMv8-A in ARM and Thumb mode at
>>>> optimization level -O1 and above [1] without any regression in the testsuite and
>>>> no code generation difference in libitm and libgomp.
>>>>
>>>> Code generation for ARMv8-M Baseline has been manually examined and compared
>>>> against ARMv8-A Thumb-2 for the following configuration without finding any
>>>> issue:
>>>>
>>>> gcc.dg/atomic-op-2.c at -Os
>>>> gcc.dg/atomic-compare-exchange-2.c at -Os
>>>> gcc.dg/atomic-compare-exchange-3.c at -O3
>>>>
>>>>
>>>> Is this ok for trunk?
>>>>

This is ok.
I'm not a fan of arm_arch_notm because we end up using a lot of double negatives
(!arm_arch_notm) but that could be cleaned in the future separately in the whole
backend.

Thanks,
Kyrill

>>>> Best regards,
>>>>
>>>> Thomas
>>>>
>>>> [1] CFLAGS_FOR_TARGET and CXXFLAGS_FOR_TARGET were set to "-O1 -g", "-O3 -g" and
>>>> undefined ("-O2 -g")
>>>> [2] The exact list is:
>>>>
>>>> gcc/testsuite/gcc.dg/atomic-compare-exchange-1.c
>>>> gcc/testsuite/gcc.dg/atomic-compare-exchange-2.c
>>>> gcc/testsuite/gcc.dg/atomic-compare-exchange-3.c
>>>> gcc/testsuite/gcc.dg/atomic-exchange-1.c
>>>> gcc/testsuite/gcc.dg/atomic-exchange-2.c
>>>> gcc/testsuite/gcc.dg/atomic-exchange-3.c
>>>> gcc/testsuite/gcc.dg/atomic-fence.c
>>>> gcc/testsuite/gcc.dg/atomic-flag.c
>>>> gcc/testsuite/gcc.dg/atomic-generic.c
>>>> gcc/testsuite/gcc.dg/atomic-generic-aux.c
>>>> gcc/testsuite/gcc.dg/atomic-invalid-2.c
>>>> gcc/testsuite/gcc.dg/atomic-load-1.c
>>>> gcc/testsuite/gcc.dg/atomic-load-2.c
>>>> gcc/testsuite/gcc.dg/atomic-load-3.c
>>>> gcc/testsuite/gcc.dg/atomic-lockfree.c
>>>> gcc/testsuite/gcc.dg/atomic-lockfree-aux.c
>>>> gcc/testsuite/gcc.dg/atomic-noinline.c
>>>> gcc/testsuite/gcc.dg/atomic-noinline-aux.c
>>>> gcc/testsuite/gcc.dg/atomic-op-1.c
>>>> gcc/testsuite/gcc.dg/atomic-op-2.c
>>>> gcc/testsuite/gcc.dg/atomic-op-3.c
>>>> gcc/testsuite/gcc.dg/atomic-op-6.c
>>>> gcc/testsuite/gcc.dg/atomic-store-1.c
>>>> gcc/testsuite/gcc.dg/atomic-store-2.c
>>>> gcc/testsuite/gcc.dg/atomic-store-3.c
>>>> gcc/testsuite/g++.dg/ext/atomic-1.C
>>>> gcc/testsuite/g++.dg/ext/atomic-2.C
>>>> gcc/testsuite/gcc.target/arm/atomic-comp-swap-release-acquire.c
>>>> gcc/testsuite/gcc.target/arm/atomic-op-acq_rel.c
>>>> gcc/testsuite/gcc.target/arm/atomic-op-acquire.c
>>>> gcc/testsuite/gcc.target/arm/atomic-op-char.c
>>>> gcc/testsuite/gcc.target/arm/atomic-op-consume.c
>>>> gcc/testsuite/gcc.target/arm/atomic-op-int.c
>>>> gcc/testsuite/gcc.target/arm/atomic-op-relaxed.c
>>>> gcc/testsuite/gcc.target/arm/atomic-op-release.c
>>>> gcc/testsuite/gcc.target/arm/atomic-op-seq_cst.c
>>>> gcc/testsuite/gcc.target/arm/atomic-op-short.c
>>>> gcc/testsuite/gcc.target/arm/atomic_loaddi_1.c
>>>> gcc/testsuite/gcc.target/arm/atomic_loaddi_2.c
>>>> gcc/testsuite/gcc.target/arm/atomic_loaddi_3.c
>>>> gcc/testsuite/gcc.target/arm/atomic_loaddi_4.c
>>>> gcc/testsuite/gcc.target/arm/atomic_loaddi_5.c
>>>> gcc/testsuite/gcc.target/arm/atomic_loaddi_6.c
>>>> gcc/testsuite/gcc.target/arm/atomic_loaddi_7.c
>>>> gcc/testsuite/gcc.target/arm/atomic_loaddi_8.c
>>>> gcc/testsuite/gcc.target/arm/atomic_loaddi_9.c
>>>> gcc/testsuite/gcc.target/arm/sync-1.c
>>>> gcc/testsuite/gcc.target/arm/synchronize.c
>>>> gcc/testsuite/gcc.target/arm/armv8-sync-comp-swap.c
>>>> gcc/testsuite/gcc.target/arm/armv8-sync-op-acquire.c
>>>> gcc/testsuite/gcc.target/arm/armv8-sync-op-full.c
>>>> gcc/testsuite/gcc.target/arm/armv8-sync-op-release.c
>>>> libstdc++-v3/testsuite/29_atomics/atomic/60658.cc
>>>> libstdc++-v3/testsuite/29_atomics/atomic/62259.cc
>>>> libstdc++-v3/testsuite/29_atomics/atomic/64658.cc
>>>> libstdc++-v3/testsuite/29_atomics/atomic/65147.cc
>>>> libstdc++-v3/testsuite/29_atomics/atomic/65913.cc
>>>> libstdc++-v3/testsuite/29_atomics/atomic/70766.cc
>>>> libstdc++-v3/testsuite/29_atomics/atomic/cons/49445.cc
>>>> libstdc++-v3/testsuite/29_atomics/atomic/cons/constexpr.cc
>>>> libstdc++-v3/testsuite/29_atomics/atomic/cons/copy_list.cc
>>>> libstdc++-v3/testsuite/29_atomics/atomic/cons/default.cc
>>>> libstdc++-v3/testsuite/29_atomics/atomic/cons/direct_list.cc
>>>> libstdc++-v3/testsuite/29_atomics/atomic/cons/single_value.cc
>>>> libstdc++-v3/testsuite/29_atomics/atomic/cons/user_pod.cc
>>>> libstdc++-v3/testsuite/29_atomics/atomic/operators/51811.cc
>>>> libstdc++-v3/testsuite/29_atomics/atomic/operators/56011.cc
>>>> libstdc++-v3/testsuite/29_atomics/atomic/operators/integral_assignment.cc
>>>> libstdc++-v3/testsuite/29_atomics/atomic/operators/integral_conversion.cc
>>>> libstdc++-v3/testsuite/29_atomics/atomic/operators/pointer_partial_void.cc
>>>> libstdc++-v3/testsuite/29_atomics/atomic/requirements/base_classes.cc
>>>> libstdc++-v3/testsuite/29_atomics/atomic/requirements/compare_exchange_lowering.cc
>>>>
>>>>
>>>> libstdc++-v3/testsuite/29_atomics/atomic/requirements/explicit_instantiation/1.cc
>>>>
>>>> libstdc++-v3/testsuite/29_atomics/atomic_flag/clear/1.cc
>>>> libstdc++-v3/testsuite/29_atomics/atomic_flag/cons/1.cc
>>>> libstdc++-v3/testsuite/29_atomics/atomic_flag/cons/56012.cc
>>>> libstdc++-v3/testsuite/29_atomics/atomic_flag/cons/aggregate.cc
>>>> libstdc++-v3/testsuite/29_atomics/atomic_flag/cons/default.cc
>>>> libstdc++-v3/testsuite/29_atomics/atomic_flag/requirements/standard_layout.cc
>>>> libstdc++-v3/testsuite/29_atomics/atomic_flag/requirements/trivial.cc
>>>> libstdc++-v3/testsuite/29_atomics/atomic_flag/test_and_set/explicit.cc
>>>> libstdc++-v3/testsuite/29_atomics/atomic_flag/test_and_set/implicit.cc
>>>> libstdc++-v3/testsuite/29_atomics/atomic_integral/60940.cc
>>>> libstdc++-v3/testsuite/29_atomics/atomic_integral/65147.cc
>>>> libstdc++-v3/testsuite/29_atomics/atomic_integral/cons/constexpr.cc
>>>> libstdc++-v3/testsuite/29_atomics/atomic_integral/cons/copy_list.cc
>>>> libstdc++-v3/testsuite/29_atomics/atomic_integral/cons/default.cc
>>>> libstdc++-v3/testsuite/29_atomics/atomic_integral/cons/direct_list.cc
>>>> libstdc++-v3/testsuite/29_atomics/atomic_integral/cons/single_value.cc
>>>> libstdc++-v3/testsuite/29_atomics/atomic_integral/operators/bitwise.cc
>>>> libstdc++-v3/testsuite/29_atomics/atomic_integral/operators/decrement.cc
>>>> libstdc++-v3/testsuite/29_atomics/atomic_integral/operators/increment.cc
>>>> libstdc++-v3/testsuite/29_atomics/atomic_integral/operators/integral_assignment.cc
>>>>
>>>>
>>>> libstdc++-v3/testsuite/29_atomics/atomic_integral/operators/integral_conversion.cc
>>>>
>>>>
>>>> libstdc++-v3/testsuite/29_atomics/atomic_integral/requirements/standard_layout.cc
>>>>
>>>> libstdc++-v3/testsuite/29_atomics/atomic_integral/requirements/trivial.cc
>>>> libstdc++-v3/testsuite/29_atomics/headers/atomic/functions_std_c++0x.cc
>>>> libstdc++-v3/testsuite/29_atomics/headers/atomic/macros.cc
>>>> libstdc++-v3/testsuite/29_atomics/headers/atomic/types_std_c++0x.cc