Re: [PATCH 06/39] target/riscv: Add vrol.[vv, vx] and vror.[vv, vx, vi] decoding, translation and execution support

[Richard Henderson <richard.henderson@xxxxxxxxxx>]

On 2/2/23 04:30, Philipp Tomsich wrote:
> On the second pass over these patches, here's how we can use gvec
> support for both vror and vrol:
>
> /* Synthesize a rotate-right from a negate(shift-amount) + rotate-left */
> static void tcg_gen_gvec_rotrs(unsigned vece, uint32_t dofs, uint32_t aofs,
>                         TCGv_i32 shift, uint32_t oprsz, uint32_t maxsz)
> {
>      TCGv_i32 tmp = tcg_temp_new_i32();
>      tcg_gen_neg_i32(tmp, shift);
>      tcg_gen_gvec_rotls(vece, dofs, aofs, tmp, oprsz, maxsz);

We can add rotls generically.
I hadn't done this so far because there were no users.


r~