[PATCH v5 2/2] RISC-V: add zbb support to string functions

[Conor Dooley]

On Fri, Jan 13, 2023 at 10:23:01PM +0100, Heiko Stuebner wrote:
> From: Heiko Stuebner <heiko.stuebner at vrull.eu>
> 
> Add handling for ZBB extension and add support for using it as a
> variant for optimized string functions.
> 
> Support for the Zbb-str-variants is limited to the GNU-assembler
> for now, as LLVM has not yet acquired the functionality to
> selectively change the arch option in assembler code.
> This is still under review at
>     https://reviews.llvm.org/D123515
> 
> Co-developed-by: Christoph Muellner <christoph.muellner at vrull.eu>
> Signed-off-by: Christoph Muellner <christoph.muellner at vrull.eu>
> Signed-off-by: Heiko Stuebner <heiko.stuebner at vrull.eu>

Had a look through, again mostly examining b4 diff...
The changes look to match the suggestions on v4, but I was happy with
the un-optimised version so I have no taste.

Reviewed-by: Conor Dooley <conor.dooley at microchip.com>

Thanks,
Conor.

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