aarch64: Improve cas generation
Do not zero-extend the input to the cas for subword operations; instead, use the appropriate zero-extending compare insns. Correct the predicates and constraints for immediate expected operand. * config/aarch64/aarch64.c (aarch64_gen_compare_reg_maybe_ze): New. (aarch64_split_compare_and_swap): Use it. (aarch64_expand_compare_and_swap): Likewise. Remove convert_modes; test oldval against the proper predicate. * config/aarch64/atomics.md (@atomic_compare_and_swap<ALLI>): Use nonmemory_operand for expected. (cas_short_expected_pred): New. (@aarch64_compare_and_swap<SHORT>): Use it; use "rn" not "rI" to match. (@aarch64_compare_and_swap<GPI>): Use "rn" not "rI" for expected. * config/aarch64/predicates.md (aarch64_plushi_immediate): New. (aarch64_plushi_operand): New. From-SVN: r265657
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