Commit dcc51978 authored by Jonas Oberhauser's avatar Jonas Oberhauser Committed by Paul E. McKenney
Browse files

tools/memory-model: Distinguish between syntactic and semantic tags 



Not all annotated accesses provide the semantics their syntactic tags
would imply. For example, an 'acquire tag on a write does not imply that
the write is finally in the Acquire set and provides acquire ordering.

To distinguish in those cases between the syntactic tags and actual
sets, we capitalize the former, so 'ACQUIRE tags may be present on both
reads and writes, but only reads will appear in the Acquire set.

For tags where the two concepts are the same we do not use specific
capitalization to make this distinction.

Reported-by: default avatarBoqun Feng <boqun.feng@gmail.com>
Signed-off-by: default avatarJonas Oberhauser <jonas.oberhauser@huaweicloud.com>
Reviewed-by: default avatarBoqun Feng <boqun.feng@gmail.com>
Tested-by: default avatarBoqun Feng <boqun.feng@gmail.com>
Signed-off-by: default avatarPaul E. McKenney <paulmck@kernel.org>
Tested-by: Akira Yokosawa <akiyks@gmail.com> # herdtools7.7.58
parent fafa1806

tools/memory-model/Documentation/herd-representation.txt

+22 −22
Original line number Diff line number Diff line
@@ -21,7 +21,7 @@ 
# Note that the syntactic representation does not always match the sets and

# relations in linux-kernel.cat, due to redefinitions in linux-kernel.bell and

# lock.cat. For example, the po link between LKR and LKW is upgraded to an rmw

# link, and W[acquire] are not included in the Acquire set.

# link, and W[ACQUIRE] are not included in the Acquire set.

#

# Disclaimer.  The table includes representations of "add" and "and" operations;

# corresponding/identical representations of "sub", "inc", "dec" and "or", "xor",
@@ -32,16 +32,16 @@ 
    ------------------------------------------------------------------------------

    |                    Non-RMW ops |                                           |

    ------------------------------------------------------------------------------

    |                      READ_ONCE | R[once]                                   |

    |                      READ_ONCE | R[ONCE]                                   |

    |                    atomic_read |                                           |

    |                     WRITE_ONCE | W[once]                                   |

    |                     WRITE_ONCE | W[ONCE]                                   |

    |                     atomic_set |                                           |

    |               smp_load_acquire | R[acquire]                                |

    |               smp_load_acquire | R[ACQUIRE]                                |

    |            atomic_read_acquire |                                           |

    |              smp_store_release | W[release]                                |

    |              smp_store_release | W[RELEASE]                                |

    |             atomic_set_release |                                           |

    |                   smp_store_mb | W[once] ->po F[mb]                        |

    |                         smp_mb | F[mb]                                     |

    |                   smp_store_mb | W[ONCE] ->po F[MB]                        |

    |                         smp_mb | F[MB]                                     |

    |                        smp_rmb | F[rmb]                                    |

    |                        smp_wmb | F[wmb]                                    |

    |          smp_mb__before_atomic | F[before-atomic]                          |
@@ -54,8 +54,8 @@ 
    |                  rcu_read_lock | F[rcu-lock]                               |

    |                rcu_read_unlock | F[rcu-unlock]                             |

    |                synchronize_rcu | F[sync-rcu]                               |

    |                rcu_dereference | R[once]                                   |

    |             rcu_assign_pointer | W[release]                                |

    |                rcu_dereference | R[ONCE]                                   |

    |             rcu_assign_pointer | W[RELEASE]                                |

    |                 srcu_read_lock | R[srcu-lock]                              |

    |                 srcu_down_read |                                           |

    |               srcu_read_unlock | W[srcu-unlock]                            |
@@ -65,31 +65,31 @@ 
    ------------------------------------------------------------------------------

    |       RMW ops w/o return value |                                           |

    ------------------------------------------------------------------------------

    |                     atomic_add | R*[noreturn] ->rmw W*[noreturn]           |

    |                     atomic_add | R*[NORETURN] ->rmw W*[NORETURN]           |

    |                     atomic_and |                                           |

    |                      spin_lock | LKR ->po LKW                              |

    ------------------------------------------------------------------------------

    |        RMW ops w/ return value |                                           |

    ------------------------------------------------------------------------------

    |              atomic_add_return | R*[mb] ->rmw W*[mb]                       |

    |              atomic_add_return | R*[MB] ->rmw W*[MB]                       |

    |               atomic_fetch_add |                                           |

    |               atomic_fetch_and |                                           |

    |                    atomic_xchg |                                           |

    |                           xchg |                                           |

    |            atomic_add_negative |                                           |

    |      atomic_add_return_relaxed | R*[once] ->rmw W*[once]                   |

    |      atomic_add_return_relaxed | R*[ONCE] ->rmw W*[ONCE]                   |

    |       atomic_fetch_add_relaxed |                                           |

    |       atomic_fetch_and_relaxed |                                           |

    |            atomic_xchg_relaxed |                                           |

    |                   xchg_relaxed |                                           |

    |    atomic_add_negative_relaxed |                                           |

    |      atomic_add_return_acquire | R*[acquire] ->rmw W*[acquire]             |

    |      atomic_add_return_acquire | R*[ACQUIRE] ->rmw W*[ACQUIRE]             |

    |       atomic_fetch_add_acquire |                                           |

    |       atomic_fetch_and_acquire |                                           |

    |            atomic_xchg_acquire |                                           |

    |                   xchg_acquire |                                           |

    |    atomic_add_negative_acquire |                                           |

    |      atomic_add_return_release | R*[release] ->rmw W*[release]             |

    |      atomic_add_return_release | R*[RELEASE] ->rmw W*[RELEASE]             |

    |       atomic_fetch_add_release |                                           |

    |       atomic_fetch_and_release |                                           |

    |            atomic_xchg_release |                                           |
@@ -98,16 +98,16 @@ 
    ------------------------------------------------------------------------------

    |            Conditional RMW ops |                                           |

    ------------------------------------------------------------------------------

    |                 atomic_cmpxchg | On success: R*[mb] ->rmw W*[mb]           |

    |                                | On failure: R*[mb]                        |

    |                 atomic_cmpxchg | On success: R*[MB] ->rmw W*[MB]           |

    |                                | On failure: R*[MB]                        |

    |                        cmpxchg |                                           |

    |              atomic_add_unless |                                           |

    |         atomic_cmpxchg_relaxed | On success: R*[once] ->rmw W*[once]       |

    |                                | On failure: R*[once]                      |

    |         atomic_cmpxchg_acquire | On success: R*[acquire] ->rmw W*[acquire] |

    |                                | On failure: R*[acquire]                   |

    |         atomic_cmpxchg_release | On success: R*[release] ->rmw W*[release] |

    |                                | On failure: R*[release]                   |

    |         atomic_cmpxchg_relaxed | On success: R*[ONCE] ->rmw W*[ONCE]       |

    |                                | On failure: R*[ONCE]                      |

    |         atomic_cmpxchg_acquire | On success: R*[ACQUIRE] ->rmw W*[ACQUIRE] |

    |                                | On failure: R*[ACQUIRE]                   |

    |         atomic_cmpxchg_release | On success: R*[RELEASE] ->rmw W*[RELEASE] |

    |                                | On failure: R*[RELEASE]                   |

    |                   spin_trylock | On success: LKR ->po LKW                  |

    |                                | On failure: LF                            |

    ------------------------------------------------------------------------------

tools/memory-model/linux-kernel.bell

+11 −11
Original line number Diff line number Diff line
@@ -13,18 +13,18 @@ 


"Linux-kernel memory consistency model"



enum Accesses = 'once (*READ_ONCE,WRITE_ONCE*) ||

		'release (*smp_store_release*) ||

		'acquire (*smp_load_acquire*) ||

		'noreturn (* R of non-return RMW *) ||

		'mb (*xchg(),cmpxchg(),...*)

enum Accesses = 'ONCE (*READ_ONCE,WRITE_ONCE*) ||

		'RELEASE (*smp_store_release*) ||

		'ACQUIRE (*smp_load_acquire*) ||

		'NORETURN (* R of non-return RMW *) ||

		'MB (*xchg(),cmpxchg(),...*)

instructions R[Accesses]

instructions W[Accesses]

instructions RMW[Accesses]



enum Barriers = 'wmb (*smp_wmb*) ||

		'rmb (*smp_rmb*) ||

		'mb (*smp_mb*) ||

		'MB (*smp_mb*) ||

		'barrier (*barrier*) ||

		'rcu-lock (*rcu_read_lock*)  ||

		'rcu-unlock (*rcu_read_unlock*) ||
@@ -42,10 +42,10 @@ instructions F[Barriers] 
 * semantic ordering, such as Acquire on a store or Mb on a failed RMW.

 *)

let FailedRMW = RMW \ (domain(rmw) | range(rmw))

let Acquire = Acquire \ W \ FailedRMW

let Release = Release \ R \ FailedRMW

let Mb = Mb \ FailedRMW

let Noreturn = Noreturn \ W

let Acquire = ACQUIRE \ W \ FailedRMW

let Release = RELEASE \ R \ FailedRMW

let Mb = MB \ FailedRMW

let Noreturn = NORETURN \ W



(* SRCU *)

enum SRCU = 'srcu-lock || 'srcu-unlock || 'sync-srcu
@@ -85,7 +85,7 @@ flag ~empty rcu-rscs & (po ; [Sync-srcu] ; po) as invalid-sleep 
flag ~empty different-values(srcu-rscs) as srcu-bad-value-match



(* Compute marked and plain memory accesses *)

let Marked = (~M) | IW | Once | Release | Acquire | domain(rmw) | range(rmw) |

let Marked = (~M) | IW | ONCE | RELEASE | ACQUIRE | MB | RMW |

		LKR | LKW | UL | LF | RL | RU | Srcu-lock | Srcu-unlock

let Plain = M \ Marked

tools/memory-model/linux-kernel.def

+99 −99
Original line number Diff line number Diff line
@@ -6,18 +6,18 @@ 
// which appeared in ASPLOS 2018.



// ONCE

READ_ONCE(X) __load{once}(X)

WRITE_ONCE(X,V) { __store{once}(X,V); }

READ_ONCE(X) __load{ONCE}(X)

WRITE_ONCE(X,V) { __store{ONCE}(X,V); }



// Release Acquire and friends

smp_store_release(X,V) { __store{release}(*X,V); }

smp_load_acquire(X) __load{acquire}(*X)

rcu_assign_pointer(X,V) { __store{release}(X,V); }

rcu_dereference(X) __load{once}(X)

smp_store_mb(X,V) { __store{once}(X,V); __fence{mb}; }

smp_store_release(X,V) { __store{RELEASE}(*X,V); }

smp_load_acquire(X) __load{ACQUIRE}(*X)

rcu_assign_pointer(X,V) { __store{RELEASE}(X,V); }

rcu_dereference(X) __load{ONCE}(X)

smp_store_mb(X,V) { __store{ONCE}(X,V); __fence{MB}; }



// Fences

smp_mb() { __fence{mb}; }

smp_mb() { __fence{MB}; }

smp_rmb() { __fence{rmb}; }

smp_wmb() { __fence{wmb}; }

smp_mb__before_atomic() { __fence{before-atomic}; }
@@ -28,14 +28,14 @@ smp_mb__after_srcu_read_unlock() { __fence{after-srcu-read-unlock}; } 
barrier() { __fence{barrier}; }



// Exchange

xchg(X,V)  __xchg{mb}(X,V)

xchg_relaxed(X,V) __xchg{once}(X,V)

xchg_release(X,V) __xchg{release}(X,V)

xchg_acquire(X,V) __xchg{acquire}(X,V)

cmpxchg(X,V,W) __cmpxchg{mb}(X,V,W)

cmpxchg_relaxed(X,V,W) __cmpxchg{once}(X,V,W)

cmpxchg_acquire(X,V,W) __cmpxchg{acquire}(X,V,W)

cmpxchg_release(X,V,W) __cmpxchg{release}(X,V,W)

xchg(X,V)  __xchg{MB}(X,V)

xchg_relaxed(X,V) __xchg{ONCE}(X,V)

xchg_release(X,V) __xchg{RELEASE}(X,V)

xchg_acquire(X,V) __xchg{ACQUIRE}(X,V)

cmpxchg(X,V,W) __cmpxchg{MB}(X,V,W)

cmpxchg_relaxed(X,V,W) __cmpxchg{ONCE}(X,V,W)

cmpxchg_acquire(X,V,W) __cmpxchg{ACQUIRE}(X,V,W)

cmpxchg_release(X,V,W) __cmpxchg{RELEASE}(X,V,W)



// Spinlocks

spin_lock(X) { __lock(X); }
@@ -63,86 +63,86 @@ atomic_set(X,V) { WRITE_ONCE(*X,V); } 
atomic_read_acquire(X) smp_load_acquire(X)

atomic_set_release(X,V) { smp_store_release(X,V); }



atomic_add(V,X) { __atomic_op{noreturn}(X,+,V); }

atomic_sub(V,X) { __atomic_op{noreturn}(X,-,V); }

atomic_and(V,X) { __atomic_op{noreturn}(X,&,V); }

atomic_or(V,X)  { __atomic_op{noreturn}(X,|,V); }

atomic_xor(V,X) { __atomic_op{noreturn}(X,^,V); }

atomic_inc(X)   { __atomic_op{noreturn}(X,+,1); }

atomic_dec(X)   { __atomic_op{noreturn}(X,-,1); }

atomic_andnot(V,X) { __atomic_op{noreturn}(X,&~,V); }



atomic_add_return(V,X) __atomic_op_return{mb}(X,+,V)

atomic_add_return_relaxed(V,X) __atomic_op_return{once}(X,+,V)

atomic_add_return_acquire(V,X) __atomic_op_return{acquire}(X,+,V)

atomic_add_return_release(V,X) __atomic_op_return{release}(X,+,V)

atomic_fetch_add(V,X) __atomic_fetch_op{mb}(X,+,V)

atomic_fetch_add_relaxed(V,X) __atomic_fetch_op{once}(X,+,V)

atomic_fetch_add_acquire(V,X) __atomic_fetch_op{acquire}(X,+,V)

atomic_fetch_add_release(V,X) __atomic_fetch_op{release}(X,+,V)



atomic_fetch_and(V,X) __atomic_fetch_op{mb}(X,&,V)

atomic_fetch_and_relaxed(V,X) __atomic_fetch_op{once}(X,&,V)

atomic_fetch_and_acquire(V,X) __atomic_fetch_op{acquire}(X,&,V)

atomic_fetch_and_release(V,X) __atomic_fetch_op{release}(X,&,V)



atomic_fetch_or(V,X) __atomic_fetch_op{mb}(X,|,V)

atomic_fetch_or_relaxed(V,X) __atomic_fetch_op{once}(X,|,V)

atomic_fetch_or_acquire(V,X) __atomic_fetch_op{acquire}(X,|,V)

atomic_fetch_or_release(V,X) __atomic_fetch_op{release}(X,|,V)



atomic_fetch_xor(V,X) __atomic_fetch_op{mb}(X,^,V)

atomic_fetch_xor_relaxed(V,X) __atomic_fetch_op{once}(X,^,V)

atomic_fetch_xor_acquire(V,X) __atomic_fetch_op{acquire}(X,^,V)

atomic_fetch_xor_release(V,X) __atomic_fetch_op{release}(X,^,V)



atomic_inc_return(X) __atomic_op_return{mb}(X,+,1)

atomic_inc_return_relaxed(X) __atomic_op_return{once}(X,+,1)

atomic_inc_return_acquire(X) __atomic_op_return{acquire}(X,+,1)

atomic_inc_return_release(X) __atomic_op_return{release}(X,+,1)

atomic_fetch_inc(X) __atomic_fetch_op{mb}(X,+,1)

atomic_fetch_inc_relaxed(X) __atomic_fetch_op{once}(X,+,1)

atomic_fetch_inc_acquire(X) __atomic_fetch_op{acquire}(X,+,1)

atomic_fetch_inc_release(X) __atomic_fetch_op{release}(X,+,1)



atomic_sub_return(V,X) __atomic_op_return{mb}(X,-,V)

atomic_sub_return_relaxed(V,X) __atomic_op_return{once}(X,-,V)

atomic_sub_return_acquire(V,X) __atomic_op_return{acquire}(X,-,V)

atomic_sub_return_release(V,X) __atomic_op_return{release}(X,-,V)

atomic_fetch_sub(V,X) __atomic_fetch_op{mb}(X,-,V)

atomic_fetch_sub_relaxed(V,X) __atomic_fetch_op{once}(X,-,V)

atomic_fetch_sub_acquire(V,X) __atomic_fetch_op{acquire}(X,-,V)

atomic_fetch_sub_release(V,X) __atomic_fetch_op{release}(X,-,V)



atomic_dec_return(X) __atomic_op_return{mb}(X,-,1)

atomic_dec_return_relaxed(X) __atomic_op_return{once}(X,-,1)

atomic_dec_return_acquire(X) __atomic_op_return{acquire}(X,-,1)

atomic_dec_return_release(X) __atomic_op_return{release}(X,-,1)

atomic_fetch_dec(X) __atomic_fetch_op{mb}(X,-,1)

atomic_fetch_dec_relaxed(X) __atomic_fetch_op{once}(X,-,1)

atomic_fetch_dec_acquire(X) __atomic_fetch_op{acquire}(X,-,1)

atomic_fetch_dec_release(X) __atomic_fetch_op{release}(X,-,1)



atomic_xchg(X,V) __xchg{mb}(X,V)

atomic_xchg_relaxed(X,V) __xchg{once}(X,V)

atomic_xchg_release(X,V) __xchg{release}(X,V)

atomic_xchg_acquire(X,V) __xchg{acquire}(X,V)

atomic_cmpxchg(X,V,W) __cmpxchg{mb}(X,V,W)

atomic_cmpxchg_relaxed(X,V,W) __cmpxchg{once}(X,V,W)

atomic_cmpxchg_acquire(X,V,W) __cmpxchg{acquire}(X,V,W)

atomic_cmpxchg_release(X,V,W) __cmpxchg{release}(X,V,W)



atomic_sub_and_test(V,X) __atomic_op_return{mb}(X,-,V) == 0

atomic_dec_and_test(X)  __atomic_op_return{mb}(X,-,1) == 0

atomic_inc_and_test(X)  __atomic_op_return{mb}(X,+,1) == 0

atomic_add_negative(V,X) __atomic_op_return{mb}(X,+,V) < 0

atomic_add_negative_relaxed(V,X) __atomic_op_return{once}(X,+,V) < 0

atomic_add_negative_acquire(V,X) __atomic_op_return{acquire}(X,+,V) < 0

atomic_add_negative_release(V,X) __atomic_op_return{release}(X,+,V) < 0



atomic_fetch_andnot(V,X) __atomic_fetch_op{mb}(X,&~,V)

atomic_fetch_andnot_acquire(V,X) __atomic_fetch_op{acquire}(X,&~,V)

atomic_fetch_andnot_release(V,X) __atomic_fetch_op{release}(X,&~,V)

atomic_fetch_andnot_relaxed(V,X) __atomic_fetch_op{once}(X,&~,V)



atomic_add_unless(X,V,W) __atomic_add_unless{mb}(X,V,W)
 
atomic_add(V,X) { __atomic_op{NORETURN}(X,+,V); }

atomic_sub(V,X) { __atomic_op{NORETURN}(X,-,V); }

atomic_and(V,X) { __atomic_op{NORETURN}(X,&,V); }

atomic_or(V,X)  { __atomic_op{NORETURN}(X,|,V); }

atomic_xor(V,X) { __atomic_op{NORETURN}(X,^,V); }

atomic_inc(X)   { __atomic_op{NORETURN}(X,+,1); }

atomic_dec(X)   { __atomic_op{NORETURN}(X,-,1); }

atomic_andnot(V,X) { __atomic_op{NORETURN}(X,&~,V); }



atomic_add_return(V,X) __atomic_op_return{MB}(X,+,V)

atomic_add_return_relaxed(V,X) __atomic_op_return{ONCE}(X,+,V)

atomic_add_return_acquire(V,X) __atomic_op_return{ACQUIRE}(X,+,V)

atomic_add_return_release(V,X) __atomic_op_return{RELEASE}(X,+,V)

atomic_fetch_add(V,X) __atomic_fetch_op{MB}(X,+,V)

atomic_fetch_add_relaxed(V,X) __atomic_fetch_op{ONCE}(X,+,V)

atomic_fetch_add_acquire(V,X) __atomic_fetch_op{ACQUIRE}(X,+,V)

atomic_fetch_add_release(V,X) __atomic_fetch_op{RELEASE}(X,+,V)



atomic_fetch_and(V,X) __atomic_fetch_op{MB}(X,&,V)

atomic_fetch_and_relaxed(V,X) __atomic_fetch_op{ONCE}(X,&,V)

atomic_fetch_and_acquire(V,X) __atomic_fetch_op{ACQUIRE}(X,&,V)

atomic_fetch_and_release(V,X) __atomic_fetch_op{RELEASE}(X,&,V)



atomic_fetch_or(V,X) __atomic_fetch_op{MB}(X,|,V)

atomic_fetch_or_relaxed(V,X) __atomic_fetch_op{ONCE}(X,|,V)

atomic_fetch_or_acquire(V,X) __atomic_fetch_op{ACQUIRE}(X,|,V)

atomic_fetch_or_release(V,X) __atomic_fetch_op{RELEASE}(X,|,V)



atomic_fetch_xor(V,X) __atomic_fetch_op{MB}(X,^,V)

atomic_fetch_xor_relaxed(V,X) __atomic_fetch_op{ONCE}(X,^,V)

atomic_fetch_xor_acquire(V,X) __atomic_fetch_op{ACQUIRE}(X,^,V)

atomic_fetch_xor_release(V,X) __atomic_fetch_op{RELEASE}(X,^,V)



atomic_inc_return(X) __atomic_op_return{MB}(X,+,1)

atomic_inc_return_relaxed(X) __atomic_op_return{ONCE}(X,+,1)

atomic_inc_return_acquire(X) __atomic_op_return{ACQUIRE}(X,+,1)

atomic_inc_return_release(X) __atomic_op_return{RELEASE}(X,+,1)

atomic_fetch_inc(X) __atomic_fetch_op{MB}(X,+,1)

atomic_fetch_inc_relaxed(X) __atomic_fetch_op{ONCE}(X,+,1)

atomic_fetch_inc_acquire(X) __atomic_fetch_op{ACQUIRE}(X,+,1)

atomic_fetch_inc_release(X) __atomic_fetch_op{RELEASE}(X,+,1)



atomic_sub_return(V,X) __atomic_op_return{MB}(X,-,V)

atomic_sub_return_relaxed(V,X) __atomic_op_return{ONCE}(X,-,V)

atomic_sub_return_acquire(V,X) __atomic_op_return{ACQUIRE}(X,-,V)

atomic_sub_return_release(V,X) __atomic_op_return{RELEASE}(X,-,V)

atomic_fetch_sub(V,X) __atomic_fetch_op{MB}(X,-,V)

atomic_fetch_sub_relaxed(V,X) __atomic_fetch_op{ONCE}(X,-,V)

atomic_fetch_sub_acquire(V,X) __atomic_fetch_op{ACQUIRE}(X,-,V)

atomic_fetch_sub_release(V,X) __atomic_fetch_op{RELEASE}(X,-,V)



atomic_dec_return(X) __atomic_op_return{MB}(X,-,1)

atomic_dec_return_relaxed(X) __atomic_op_return{ONCE}(X,-,1)

atomic_dec_return_acquire(X) __atomic_op_return{ACQUIRE}(X,-,1)

atomic_dec_return_release(X) __atomic_op_return{RELEASE}(X,-,1)

atomic_fetch_dec(X) __atomic_fetch_op{MB}(X,-,1)

atomic_fetch_dec_relaxed(X) __atomic_fetch_op{ONCE}(X,-,1)

atomic_fetch_dec_acquire(X) __atomic_fetch_op{ACQUIRE}(X,-,1)

atomic_fetch_dec_release(X) __atomic_fetch_op{RELEASE}(X,-,1)



atomic_xchg(X,V) __xchg{MB}(X,V)

atomic_xchg_relaxed(X,V) __xchg{ONCE}(X,V)

atomic_xchg_release(X,V) __xchg{RELEASE}(X,V)

atomic_xchg_acquire(X,V) __xchg{ACQUIRE}(X,V)

atomic_cmpxchg(X,V,W) __cmpxchg{MB}(X,V,W)

atomic_cmpxchg_relaxed(X,V,W) __cmpxchg{ONCE}(X,V,W)

atomic_cmpxchg_acquire(X,V,W) __cmpxchg{ACQUIRE}(X,V,W)

atomic_cmpxchg_release(X,V,W) __cmpxchg{RELEASE}(X,V,W)



atomic_sub_and_test(V,X) __atomic_op_return{MB}(X,-,V) == 0

atomic_dec_and_test(X)  __atomic_op_return{MB}(X,-,1) == 0

atomic_inc_and_test(X)  __atomic_op_return{MB}(X,+,1) == 0

atomic_add_negative(V,X) __atomic_op_return{MB}(X,+,V) < 0

atomic_add_negative_relaxed(V,X) __atomic_op_return{ONCE}(X,+,V) < 0

atomic_add_negative_acquire(V,X) __atomic_op_return{ACQUIRE}(X,+,V) < 0

atomic_add_negative_release(V,X) __atomic_op_return{RELEASE}(X,+,V) < 0



atomic_fetch_andnot(V,X) __atomic_fetch_op{MB}(X,&~,V)

atomic_fetch_andnot_acquire(V,X) __atomic_fetch_op{ACQUIRE}(X,&~,V)

atomic_fetch_andnot_release(V,X) __atomic_fetch_op{RELEASE}(X,&~,V)

atomic_fetch_andnot_relaxed(V,X) __atomic_fetch_op{ONCE}(X,&~,V)



atomic_add_unless(X,V,W) __atomic_add_unless{MB}(X,V,W)