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DIR:OUT; SFP:1101; X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-OriginalArrivalTime: 13 Feb 2023 20:13:35.6802 (UTC) X-MS-Exchange-CrossTenant-Network-Message-Id: f8a5a8de-f899-4a55-3a0a-08db0dfec990 X-MS-Exchange-CrossTenant-Id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-OriginalAttributedTenantConnectingIp: TenantId=f34e5979-57d9-4aaa-ad4d-b122a662184d; Ip=[63.35.35.123]; Helo=[64aa7808-outbound-1.mta.getcheckrecipient.com] X-MS-Exchange-CrossTenant-AuthSource: AM7EUR03FT035.eop-EUR03.prod.protection.outlook.com X-MS-Exchange-CrossTenant-AuthAs: Anonymous X-MS-Exchange-CrossTenant-FromEntityHeader: HybridOnPrem X-MS-Exchange-Transport-CrossTenantHeadersStamped: PAXPR08MB6623 X-BeenThere: dev@dpdk.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: DPDK patches and discussions List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: dev-bounces@dpdk.org >=20 > On Fri, Feb 10, 2023 at 07:56:22PM -0600, Honnappa Nagarahalli wrote: > > The size generic atomic intrinsics generate the same code as the size > > specific intrinsics for gcc. Use size generic intrinsics for both gcc > > and clang. > > > > Fixes: 7bdccb93078e ("eal: fix ARM build with clang") > > Cc: stable@dpdk.org > > Cc: pbhagavatula@marvell.com > > > > Signed-off-by: Honnappa Nagarahalli >=20 > Acked-by: Tyler Retzlaff >=20 > so first of all thanks for fixing this up. it was confusing me why it was= being > conditionally compiled (there was no documented rationale). >=20 > i do have a slight concern that perhaps the reason this was done was beca= use > __atomic_exchange_n on some gcc versions or for some specific target > processor was generating less than desirable code but if nobody else has = this > concern i won't get in the way since it simplifies things. Agree, I could not find a rationale from the commit logs. However, I did so= me tests on Godbolt and the latest compilers generated the same code for bo= th the variants for x86 and ARM. I think the initial author was Stephen, may be he has some comments. >=20 > thanks! >=20 > > --- > > lib/eal/include/generic/rte_atomic.h | 12 ------------ > > 1 file changed, 12 deletions(-) > > > > diff --git a/lib/eal/include/generic/rte_atomic.h > > b/lib/eal/include/generic/rte_atomic.h > > index f5c49a9870..234b268b91 100644 > > --- a/lib/eal/include/generic/rte_atomic.h > > +++ b/lib/eal/include/generic/rte_atomic.h > > @@ -176,11 +176,7 @@ rte_atomic16_exchange(volatile uint16_t *dst, > > uint16_t val); static inline uint16_t rte_atomic16_exchange(volatile > > uint16_t *dst, uint16_t val) { -#if defined(__clang__) > > return __atomic_exchange_n(dst, val, __ATOMIC_SEQ_CST); -#else > > - return __atomic_exchange_2(dst, val, __ATOMIC_SEQ_CST); > > -#endif > > } > > #endif > > > > @@ -459,11 +455,7 @@ rte_atomic32_exchange(volatile uint32_t *dst, > > uint32_t val); static inline uint32_t rte_atomic32_exchange(volatile > > uint32_t *dst, uint32_t val) { -#if defined(__clang__) > > return __atomic_exchange_n(dst, val, __ATOMIC_SEQ_CST); -#else > > - return __atomic_exchange_4(dst, val, __ATOMIC_SEQ_CST); > > -#endif > > } > > #endif > > > > @@ -741,11 +733,7 @@ rte_atomic64_exchange(volatile uint64_t *dst, > > uint64_t val); static inline uint64_t rte_atomic64_exchange(volatile > > uint64_t *dst, uint64_t val) { -#if defined(__clang__) > > return __atomic_exchange_n(dst, val, __ATOMIC_SEQ_CST); -#else > > - return __atomic_exchange_8(dst, val, __ATOMIC_SEQ_CST); > > -#endif > > } > > #endif > > > > -- > > 2.25.1