* config/aarch64/aarch64.md (rev16<mode>2): New pattern.
       (rev16<mode>2_alt): Likewise.
       * config/aarch64/aarch64.c (aarch64_rtx_costs): Handle rev16 case.
       * config/arm/aarch-common.c (aarch_rev16_shright_mask_imm_p): New.
       (aarch_rev16_shleft_mask_imm_p): Likewise.
       (aarch_rev16_p_1): Likewise.
       (aarch_rev16_p): Likewise.
       * config/arm/aarch-common-protos.h (aarch_rev16_p): Declare extern.
       (aarch_rev16_shright_mask_imm_p): Likewise.
       (aarch_rev16_shleft_mask_imm_p): Likewise.

       * gcc.target/aarch64/rev16_1.c: New test.

From-SVN: r209704