[PATCH] Use GET_MODE_BITSIZE to get vector natural alignment

[H.J. Lu]

On Mon, Oct 19, 2015 at 4:05 AM, Uros Bizjak <ubizjak@gmail.com> wrote:
> On Fri, Oct 16, 2015 at 7:42 PM, H.J. Lu <hongjiu.lu@intel.com> wrote:
>> Since GET_MODE_ALIGNMENT is defined by psABI and the biggest alignment
>> is 4 byte for IA MCU psABI, we should use GET_MODE_BITSIZE to get
>> vector natural alignment to check misaligned vector move.
>>
>> OK for trunk?
>>
>> Thanks.
>>
>> H.J.
>> ---
>>         * config/i386/i386.c (ix86_expand_vector_move): Use
>>         GET_MODE_BITSIZE to get vector natural alignment.
>> ---
>>  gcc/config/i386/i386.c | 4 +++-
>>  1 file changed, 3 insertions(+), 1 deletion(-)
>>
>> diff --git a/gcc/config/i386/i386.c b/gcc/config/i386/i386.c
>> index ebe2b0a..d0e1f4c 100644
>> --- a/gcc/config/i386/i386.c
>> +++ b/gcc/config/i386/i386.c
>> @@ -18650,7 +18650,9 @@ void
>>  ix86_expand_vector_move (machine_mode mode, rtx operands[])
>>  {
>>    rtx op0 = operands[0], op1 = operands[1];
>> -  unsigned int align = GET_MODE_ALIGNMENT (mode);
>> +  /* Use GET_MODE_BITSIZE instead of GET_MODE_ALIGNMENT since the
>> +     biggest alignment is 4 byte for IA MCU psABI.  */
>> +  unsigned int align = GET_MODE_BITSIZE (mode);
>
> How about using TARGET_IAMCU condition here and using bitsize only for
> TARGET_IAMCU?
>

Works for me.  Is it OK with that change?


-- 
H.J.