[PATCH][GAS][ARM] Assembeler and disassembler support for new FP16 instructions [Patch (3/3)]

[Tamar Christina]

Hi All,

This patch add assembler and disassembler support for new FP16 instructions
introduced in Armv8.4-A and back-ported as optional extensions from Armv8.2-A.

  These new instructions also require FP16 extension enabled.

  For example, the support can be enabled through the following option:

     -march=armv8.2-a+fp16".

Checked with check-gas on arm-none-eabi, armeb-none-eabi, no regressions.

Ok for master?

Ps. I do not have commit access so if OK can someone apply for me?

Thanks,
Tamar

gas/
2017-11-08  Jiong Wang  <jiong.wang@arm.com>
	    Tamar Christina <tamar.christina@arm.com>

        * config/tc-arm.c (arm_ext_v8_2): New variable.
        (enum arm_reg_type): New enumeration REG_TYPE_NSD.
        (reg_expected_msgs): New entry for REG_TYPE_NSD.
        (parse_typed_reg_or_scalar): Handle REG_TYPE_NSD.
        (parse_scalar): Support REG_TYPE_VFS.
        (enum operand_parse_code): New enumerations OP_RNSD and OP_RNSD_RNSC.
        (parse_operands): Handle OP_RNSD and OP_RNSD_RNSC.
        (NEON_SHAPE_DEF): New entries for DHH and DHS.
        (neon_scalar_for_fmac_fp16_long): New function to generate Rm encoding
        for new FP16 instructions in ARMv8.2-A.
        (do_neon_fmac_maybe_scalar_long): New function to encode new FP16
        instructions in ARMv8.2-A.
        (do_neon_vfmal): Wrapper function for vfmal.
        (do_neon_vfmsl): Wrapper function for vfmsl.
        (insns): New entries for vfmal and vfmsl.
        * testsuite/gas/arm/armv8_2-a-fp16.s: New test source.
        * testsuite/gas/arm/armv8_2-a-fp16-illegal.s: New test source.
        * testsuite/gas/arm/armv8_2-a-fp16.d: New test.
        * testsuite/gas/arm/armv8_3-a-fp16.d: New test.
        * testsuite/gas/arm/armv8_4-a-fp16.d: New test.
        * testsuite/gas/arm/armv8_2-a-fp16-thumb2.d: New test.
        * testsuite/gas/arm/armv8_2-a-fp16-illegal.d: New test.
        * testsuite/gas/arm/armv8_2-a-fp16-illegal.l: New error file.

opcodes/
2017-11-08  Jiong Wang  <jiong.wang@arm.com>
	    Tamar Christina <tamar.christina@arm.com>

        * arm-dis.c (coprocessor_opcodes): New entries for ARMv8.2-A new FP16
        instructions, including vfmal.f16 and vfmsl.f16.

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