Re: [PATCH 04/16] target/arm: Use cpu_*_data_ra for sve_ldst_tlb_fn

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

On 4/16/20 5:19 AM, Peter Maydell wrote:
> On Wed, 11 Mar 2020 at 06:44, Richard Henderson
> <richard.henderson@linaro.org> wrote:
>>
>> Use the "normal" memory access functions, rather than the
>> softmmu internal helper functions directly.
>>
>> Since fb901c905dc3, cpu_mem_index is now a simple extract
>> from env->hflags and not a large computation.  Which means
>> that it's now more work to pass around this value than it
>> is to recompute it.
>>
>> This only adjusts the primitives, and does not clean up
>> all of the uses within sve_helper.c.
>>
>> Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
>> ---
>>  target/arm/sve_helper.c | 241 ++++++++++++++++++----------------------
>>  1 file changed, 107 insertions(+), 134 deletions(-)
> 
>> +#ifdef TARGET_WORDS_BIGENDIAN
>> +# define be_bswap16(x)  ((uint16_t)(x))
>> +# define be_bswap32(x)  ((uint32_t)(x))
>> +# define be_bswap64(x)  ((uint64_t)(x))
>> +# define le_bswap16(x)  bswap16(x)
>> +# define le_bswap32(x)  bswap32(x)
>> +# define le_bswap64(x)  bswap64(x)
>> +#else
>> +# define be_bswap16(x)  bswap16(x)
>> +# define be_bswap32(x)  bswap32(x)
>> +# define be_bswap64(x)  bswap64(x)
>> +# define le_bswap16(x)  ((uint16_t)(x))
>> +# define le_bswap32(x)  ((uint32_t)(x))
>> +# define le_bswap64(x)  ((uint64_t)(x))
>> +#endif
> 
> Am I confused, or are these just reimplementing
> cpu_to_be16()/cpu_to_le16()/le16_to_cpu()/be16_to_cpu() etc from bswap.h ?

Those depend on HOST_WORDS_BIGENDIAN, this is TARGET_WORDS_BIGENDIAN.

> (It seems a pity to have to lose the memory subsystem handling
> endianness for us.)

It is.  I have added a patch to improve the memory subsystem.


r~