[PATCH 1/2] Correct the requirement of compressed floating point instructions.

[Kito Cheng]

ChangeLog

2018-08-29  Kito Cheng  <kito@andestech.com>

gas/
       * config/tc-riscv.c (riscv_subset_supports): New argument:
       xlen_required.
       (riscv_multi_subset_supports): New function, able to check more
       than one extension.
       (riscv_ip): Use riscv_multi_subset_supports instead of
       riscv_subset_supports.
       (riscv_set_arch): Update call-site for riscv_subset_supports.
       (riscv_after_parse_args): Likewise.

include/
       *opcode/riscv.h (MAX_SUBSET_NUM): New.
       (riscv_opcode): Add xlen_requirement field and change type of
       subset.

opcodes/
       * riscv-dis.c (riscv_disassemble_insn): Check XLEN by
       riscv_opcode.xlen_requirement.
       * riscv-opc.c (riscv_opcodes): Update for struct change.
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