arm.c (arm_emit_load_exclusive): Add acq parameter.
2013-03-25 Kyrylo Tkachov <kyrylo.tkachov@arm.com>
* config/arm/arm.c (arm_emit_load_exclusive): Add acq parameter.
Emit load-acquire versions when acq is true.
(arm_emit_store_exclusive): Add rel parameter.
Emit store-release versions when rel is true.
(arm_split_compare_and_swap): Use acquire-release instructions
instead.
of barriers when appropriate.
(arm_split_atomic_op): Likewise.
* config/arm/arm.h (TARGET_HAVE_LDACQ): New macro.
* config/arm/unspecs.md (VUNSPEC_LAX): New unspec.
(VUNSPEC_SLX): Likewise.
(VUNSPEC_LDA): Likewise.
(VUNSPEC_STL): Likewise.
* config/arm/sync.md (atomic_load<mode>): New pattern.
(atomic_store<mode>): Likewise.
(arm_load_acquire_exclusive<mode>): Likewise.
(arm_load_acquire_exclusivesi): Likewise.
(arm_load_acquire_exclusivedi): Likewise.
(arm_store_release_exclusive<mode>): Likewise.
From-SVN: r197046