Re: [PATCH 11/17] tests/tcg: only read/write 64 bit words on 64 bit systems

["Alex Bennée" <alex.bennee@linaro.org>]

Philippe Mathieu-Daudé <philmd@linaro.org> writes:

> On 13/9/24 19:26, Alex Bennée wrote:
>> While the compilers will generally happily synthesise a 64 bit value
>> for you on 32 bit systems it doesn't exercise anything on QEMU. It
>> also makes it hard to accurately compare the accesses to test_data
>> when instrumenting.
>> Message-Id: <20240910140733.4007719-21-alex.bennee@linaro.org>
>> Reviewed-by: Pierrick Bouvier <pierrick.bouvier@linaro.org>
>> Signed-off-by: Alex Bennée <alex.bennee@linaro.org>
>> ---
>>   tests/tcg/multiarch/system/memory.c | 26 +++++++++++++++++++-------
>>   1 file changed, 19 insertions(+), 7 deletions(-)
>> diff --git a/tests/tcg/multiarch/system/memory.c
>> b/tests/tcg/multiarch/system/memory.c
>> index 8f2371975d..680dd4800b 100644
>> --- a/tests/tcg/multiarch/system/memory.c
>> +++ b/tests/tcg/multiarch/system/memory.c
>> @@ -163,6 +163,7 @@ static void init_test_data_u32(int offset)
>>       ml_printf("done %d @ %p\n", i, ptr);
>>   }
>>   +#if __SIZEOF_POINTER__ == 8
>
>>= ? :)

Ahh I was confused by the email quoting. Do we actually have any systems
with bigger pointers or is this just for future proofing?

>
>>   static void init_test_data_u64(int offset)
>>   {
>>       uint8_t count = 0;
>> @@ -187,6 +188,7 @@ static void init_test_data_u64(int offset)
>>       }
>>       ml_printf("done %d @ %p\n", i, ptr);
>>   }
>> +#endif
>>     static bool read_test_data_u16(int offset)
>>   {
>> @@ -254,6 +256,7 @@ static bool read_test_data_u32(int offset)
>>       return true;
>>   }
>>   +#if __SIZEOF_POINTER__ == 8
>>   static bool read_test_data_u64(int offset)
>>   {
>>       uint64_t word, *ptr = (uint64_t *)&test_data[offset];
>> @@ -307,11 +310,16 @@ static bool read_test_data_u64(int offset)
>>       ml_printf("done %d @ %p\n", i, ptr);
>>       return true;
>>   }
>> +#endif
>>     /* Read the test data and verify at various offsets */
>> -read_ufn read_ufns[] = { read_test_data_u16,
>> -                         read_test_data_u32,
>> -                         read_test_data_u64 };
>> +read_ufn read_ufns[] = {
>> +    read_test_data_u16,
>> +    read_test_data_u32,
>> +#if __SIZEOF_POINTER__ == 8
>> +    read_test_data_u64
>> +#endif
>> +};
>>     bool do_unsigned_reads(int start_off)
>>   {
>> @@ -476,10 +484,14 @@ bool do_signed_reads(bool neg_first)
>>       return ok;
>>   }
>>   -init_ufn init_ufns[] = { init_test_data_u8,
>> -                         init_test_data_u16,
>> -                         init_test_data_u32,
>> -                         init_test_data_u64 };
>> +init_ufn init_ufns[] = {
>> +    init_test_data_u8,
>> +    init_test_data_u16,
>> +    init_test_data_u32,
>> +#if __SIZEOF_POINTER__ == 8
>> +    init_test_data_u64
>> +#endif
>> +};
>>     int main(void)
>>   {

-- 
Alex Bennée
Virtualisation Tech Lead @ Linaro