Re: [PATCH 1/2] target/arm: Disable VFPv4-D32 when NEON is not available

[Peter Maydell]

On Thu, 29 Sept 2022 at 16:22, Richard Henderson
<richard.henderson@linaro.org> wrote:
>
> On 9/29/22 04:44, Peter Maydell wrote:
> > Architecturally, Neon implies that you must have 32 dp registers,
> > but not having Neon does not imply that you must only have 16.
> > In particular, the Cortex-A15 always implements VFPv4-D32
> > whether Neon is enabled or not.
>
> A15 requires VFP == NEON in its configuration.

No, it requires that if you have Neon then you have VFP;
but it allows all of:
 * no VFP or Neon
 * VFP, no Neon
 * VFP and Neon

https://developer.arm.com/documentation/ddi0438/i/neon-and-vfp-unit/about-neon-and-vfp-unit

-- PMM