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Commite09db94

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Use more of gcc's __sync_fetch_and_xxx builtin functions for atomic ops.
In addition to __sync_fetch_and_add, gcc offers __sync_fetch_and_sub,__sync_fetch_and_and, and __sync_fetch_and_or, which correspond directlyto primitive atomic ops that we want. Testing shows that in some casesthey generate better code than our generic implementations, so use them.We've assumed that configure's test for __sync_val_compare_and_swap issufficient to allow assuming that __sync_fetch_and_add is available, somake the same assumption for these functions. Should that prove to bewrong, we can add more configure tests.Yura Sokolov, reviewed by Jesper Pedersen and myselfDiscussion:https://postgr.es/m/7f65886daca545067f82bf2b463b218d@postgrespro.ru
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‎src/include/port/atomics/generic-gcc.h

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@@ -176,6 +176,8 @@ pg_atomic_compare_exchange_u32_impl(volatile pg_atomic_uint32 *ptr,
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}
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#endif
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/* if we have 32-bit __sync_val_compare_and_swap, assume we have these too: */
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#if !defined(PG_HAVE_ATOMIC_FETCH_ADD_U32)&& defined(HAVE_GCC__SYNC_INT32_CAS)
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#definePG_HAVE_ATOMIC_FETCH_ADD_U32
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staticinlineuint32
@@ -185,6 +187,33 @@ pg_atomic_fetch_add_u32_impl(volatile pg_atomic_uint32 *ptr, int32 add_)
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}
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#endif
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#if !defined(PG_HAVE_ATOMIC_FETCH_SUB_U32)&& defined(HAVE_GCC__SYNC_INT32_CAS)
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#definePG_HAVE_ATOMIC_FETCH_SUB_U32
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staticinlineuint32
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pg_atomic_fetch_sub_u32_impl(volatilepg_atomic_uint32*ptr,int32sub_)
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{
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return__sync_fetch_and_sub(&ptr->value,sub_);
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}
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#endif
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#if !defined(PG_HAVE_ATOMIC_FETCH_AND_U32)&& defined(HAVE_GCC__SYNC_INT32_CAS)
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#definePG_HAVE_ATOMIC_FETCH_AND_U32
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staticinlineuint32
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pg_atomic_fetch_and_u32_impl(volatilepg_atomic_uint32*ptr,uint32and_)
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{
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return__sync_fetch_and_and(&ptr->value,and_);
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}
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#endif
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#if !defined(PG_HAVE_ATOMIC_FETCH_OR_U32)&& defined(HAVE_GCC__SYNC_INT32_CAS)
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#definePG_HAVE_ATOMIC_FETCH_OR_U32
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staticinlineuint32
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pg_atomic_fetch_or_u32_impl(volatilepg_atomic_uint32*ptr,uint32or_)
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{
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return__sync_fetch_and_or(&ptr->value,or_);
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}
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#endif
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#if !defined(PG_DISABLE_64_BIT_ATOMICS)
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@@ -214,6 +243,8 @@ pg_atomic_compare_exchange_u64_impl(volatile pg_atomic_uint64 *ptr,
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}
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#endif
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/* if we have 64-bit __sync_val_compare_and_swap, assume we have these too: */
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#if !defined(PG_HAVE_ATOMIC_FETCH_ADD_U64)&& defined(HAVE_GCC__SYNC_INT64_CAS)
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#definePG_HAVE_ATOMIC_FETCH_ADD_U64
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staticinlineuint64
@@ -223,6 +254,33 @@ pg_atomic_fetch_add_u64_impl(volatile pg_atomic_uint64 *ptr, int64 add_)
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}
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#endif
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#if !defined(PG_HAVE_ATOMIC_FETCH_SUB_U64)&& defined(HAVE_GCC__SYNC_INT64_CAS)
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#definePG_HAVE_ATOMIC_FETCH_SUB_U64
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staticinlineuint64
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pg_atomic_fetch_sub_u64_impl(volatilepg_atomic_uint64*ptr,int64sub_)
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{
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return__sync_fetch_and_sub(&ptr->value,sub_);
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}
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#endif
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#if !defined(PG_HAVE_ATOMIC_FETCH_AND_U64)&& defined(HAVE_GCC__SYNC_INT64_CAS)
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#definePG_HAVE_ATOMIC_FETCH_AND_U64
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staticinlineuint64
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pg_atomic_fetch_and_u64_impl(volatilepg_atomic_uint64*ptr,uint64and_)
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{
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return__sync_fetch_and_and(&ptr->value,and_);
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}
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#endif
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#if !defined(PG_HAVE_ATOMIC_FETCH_OR_U64)&& defined(HAVE_GCC__SYNC_INT64_CAS)
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#definePG_HAVE_ATOMIC_FETCH_OR_U64
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staticinlineuint64
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pg_atomic_fetch_or_u64_impl(volatilepg_atomic_uint64*ptr,uint64or_)
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{
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return__sync_fetch_and_or(&ptr->value,or_);
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}
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#endif
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#endif/* !defined(PG_DISABLE_64_BIT_ATOMICS) */
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#endif/* defined(HAVE_ATOMICS) */

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