[RFC] RISC-V: Support Zibi extension.

[Jeffrey Law]

On 3/13/2026 6:30 AM, Jiawei wrote:
> This patch supports Zibi extension(Branch with immediate) instructions.
>
> https://github.com/riscv/zibi
>
> bfd/ChangeLog:
>
> 	* elfxx-riscv.c (riscv_multi_subset_supports): New ext.
> 	(riscv_multi_subset_supports_ext): Ditto.
>
> gas/ChangeLog:
>
> 	* NEWS:  Support Zibi extension.
> 	* testsuite/gas/riscv/march-help.l: New ext.
> 	* testsuite/gas/riscv/zibi.d: New test.
> 	* testsuite/gas/riscv/zibi.s: New test.
>
> include/ChangeLog:
>
> 	* opcode/riscv-opc.h (MATCH_BEQI): New match opcode.
> 	(MASK_BEQI): New mask opcode.
> 	(MATCH_BNEI): New match opcode.
> 	(MASK_BNEI): New mask opcode.
> 	(DECLARE_INSN): New insn declare.
> 	* opcode/riscv.h (enum riscv_insn_class): New ext.
>
> opcodes/ChangeLog:
>
> 	* riscv-opc.c: New instructions def.
THanks Jaiwei.  What's the current state of this extension?  Policy 
to-date has been to not include things into the GNU tools until spec 
hits the frozen state.  It looks like this one is still at 0.1, which I 
don't think is frozen.

Definitely looking forward to more expressive conditional branches 
though :-)  We generate some truly silly code because the ISA is so 
limited in its conditional branch capabilities.

jeff