Re: [Qemu-devel] [PATCH v4 38/39] tcg/arm: Use LDRD to load tlb mask+table

[Peter Maydell]

On Tue, 4 Jun 2019 at 22:08, Richard Henderson
<address@hidden> wrote:
>
> This changes the code generation for the tlb from e.g.
>
>         ldr      ip, [r6, #-0x10]
>         ldr      r2, [r6, #-0xc]
>         and      ip, ip, r4, lsr #8
>         ldrd     r0, r1, [r2, ip]!
>         ldr      r2, [r2, #0x18]
>
> to
>
>         ldrd     r0, r1, [r6, #-0x10]
>         and      r0, r0, r4, lsr #8
>         ldrd     r2, r3, [r1, r0]!
>         ldr      r1, [r1, #0x18]
>
> for armv7 hosts.  Rearranging the register allocation in
> order to avoid overlap between the two ldrd pairs causes
> the patch to be larger than it ordinarily would be.
>
> Signed-off-by: Richard Henderson <address@hidden>
Reviewed-by: Peter Maydell <address@hidden>

thanks
-- PMM