Re: [PATCH 09/10] target/arm: Implement FPSCR.LTPSIZE for M-profile LOB extension

[Richard Henderson]

On 10/13/20 1:38 PM, Peter Maydell wrote:
>  * has short-vector support (eg Cortex-A9)
>  * v8A, can implement FPSCR.{Stride,Len} as RAZ/WI
>  * no short-vector support, Stride/Len can be written
>    but the only effect is that some insns must UNDEF
>    (eg Cortex-A7)

Yep.

The other thing I wondered is if it was worthwhile to go ahead and split out
ltpsize now, even with MTE not implemented.

Eventually the conditions here would look like

    if (m-profile) {
        if (mte) {
            ltpsize = [18:16];
        }
    } else {
        if (!v8) {
            vec_len = [18:16];
            vec_stride = [22:20];
        }
    }

but for now you could leave out the assignment to ltpsize and just leave it
initialized to 4 since reset.


r~