[PATCH] RISC-V: Support Zvabd extension instructions.

[Jeffrey Law]

On 5/28/2026 4:06 AM, Jiawei wrote:
> This patch adds support for the Zvabd extension instructions:
> https://github.com/riscv/integer-vector-absolute-difference
>
> The Zvabd extension provides RISC-V vector integer absolute difference
> operations.
>
> The widening accumulate mnemonics follow the current frozen specification
> are vwabda.vv and vwabdau.vv.
>
> bfd/ChangeLog:
>
> 	* elfxx-riscv.c (riscv_multi_subset_supports): Add Zvabd implication
>    of zve32x.
> 	(riscv_multi_subset_supports_ext): Add Zvabd.
>
> gas/ChangeLog:
>
> 	* NEWS:
> 	* testsuite/gas/riscv/march-help.l: Add Zvabd.
> 	* testsuite/gas/riscv/zvabd.d: New test.
> 	* testsuite/gas/riscv/zvabd.s: New test.
>
> include/ChangeLog:
>
> 	* opcode/riscv-opc.h (MATCH_VABS_V): New macro.
> 	(MASK_VABS_V): Ditto.
> 	(MATCH_VABD_VV): Ditto.
> 	(MASK_VABD_VV): Ditto.
> 	(MATCH_VABDU_VV): Ditto.
> 	(MASK_VABDU_VV): Ditto.
> 	(MATCH_VWABDA_VV): Ditto.
> 	(MASK_VWABDA_VV): Ditto.
> 	(MATCH_VWABDAU_VV): Ditto.
> 	(MASK_VWABDAU_VV): Ditto.
> 	* opcode/riscv.h (enum riscv_insn_class): New extension.
>
> opcodes/ChangeLog:
>
> 	* riscv-opc.c: New instructions.
I've pushed this to the trunk.  Thanks.
jeff