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gcc * config/pa/pa.md (UNSPEC_MEMORY_BARRIER): New unspec enum. Update comment for atomic instructions. (atomic_storeqi, atomic_storehi, atomic_storesi, atomic_storesf, atomic_loaddf, atomic_loaddf_1, atomic_storedf, atomic_storedf_1): Remove. (atomic_loaddi): Revise fence expansion to only emit fence prior to load for __ATOMIC_SEQ_CST model. (atomic_loaddi_1): Remove float register target. (atomic_storedi): Handle CONST_INT values. (atomic_storedi_1): Remove float register source. Add special case for zero value. (memory_barrier): New expander and insn. libgcc * config/pa/linux-atomic.c: Update comment. (FETCH_AND_OP_2, OP_AND_FETCH_2, FETCH_AND_OP_WORD, OP_AND_FETCH_WORD, COMPARE_AND_SWAP_2, __sync_val_compare_and_swap_4, SYNC_LOCK_TEST_AND_SET_2, __sync_lock_test_and_set_4): Use __ATOMIC_RELAXED for atomic loads. (SYNC_LOCK_RELEASE_1): New define. Use __sync_synchronize() and unordered store to release lock. (__sync_lock_release_8): Likewise. (SYNC_LOCK_RELEASE_2): Remove define. From-SVN: r263488
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