Re: [PATCH 1/2] include/exec: Make ld*_p and st*_p functions available for generic code, too

[Richard Henderson <richard.henderson@linaro.org>]

On 5/17/23 00:42, Thomas Huth wrote:
> +static inline int ldl_p(const void *ptr)
> +{
> +    return tswap32(ldl_he_p(ptr));

Not an ideal formulation for some hosts, e.g. Power < 3.0, because there is no separate 
bswap instruction.  Power 2.07 only has bswapping-load/store.  Keeping the bswap adjacent 
to the memory operation helps the compiler.


> +static inline uint64_t ldn_p(const void *ptr, int sz)
> +{
> +    if (target_needs_bswap()) {
> +#if HOST_BIG_ENDIAN
> +        return ldn_le_p(ptr, sz);
> +#else
> +        return ldn_be_p(ptr, sz);
> +#endif
> +    } else {
> +        return ldn_he_p(ptr, sz);
> +    }

Better to avoid #if for if.  And even better to merge to one test:

     if (HOST_BIG_ENDIAN ^ target_needs_bswap()) {
         return ldn_le_p(ptr, sz);
     } else {
         return ldn_be_p(ptr, sz);
     }


r~