[patch] ARM half-precision support

[Nick Clifton]

Hi Catherine,

> This patch adds the binutils support for arm half-precision 
> instructions.  Does this look okay to install?

It does, but - how was it tested ?  Did you check that it does not break 
  an arm-vxworks target for example ?

>         gas/
>         * config/tc-arm.c (neon_type_mask): Renumber.
>         (type_chk_of_el_type): Handle F_F16.
>         (neon_cvt_flavour): Recognize half-precision conversions.
>         (do_neon_cvt): New shapes NS_QD and NS_DQ.  Encode half-precision
>         conversions.
>         (do_neon_cvtt): Encode the T bit.
>         (asm_opcode_insns): vcvt, vcvtt support.
>         (arm_option_cpu_value): Add neon-fp16 support.
> 
>         include/
>         * opcode/arm.h (FPU_NEON_FP16): New.
>         (FPU_ARCH_NEON_FP16): New.
>         * elf/arm.h (Tag_ABI_FP_16bit_format): Define.
> 
>         opcodes/
>         * arm-dis.c (coprocessor_opcodes): Add half-precision vcvt
>         instructions.
>         (neon_opcodes): Likewise.
>         (print_insn_coprocessor): Print 't' or 'b' for
>         vcvt instructions.
> 
>         binutils/
>         * readelf.c (arm_attr_tag_ABI_FP_16bit_format): New.
>         (arm_attr_tag_VFP_HP_extension): New.
>         (arm_attr_public_tag arm_attr_public_tags): Support new
>         attributes.
> 
>         bfd/
>         * elf32-arm.c (elf32_arm_merge_eabi_attributes): Merge
>         half-precision attributes.
>         (elf32_arm_copy_one_eabi_other_attribute): New.
>         (elf32_arm_copy_other_attribute_list): New.

Approved - assuming that the testing does not reveal any problems - 
please apply.

Cheers
   Nick