Is there a way to adjust alignment of DImode and DFmode?

H.J. Lu hjl.tools@gmail.com
Thu May 21 21:25:00 GMT 2015


On Thu, May 21, 2015 at 2:08 PM, H.J. Lu <hjl.tools@gmail.com> wrote:
> On Thu, May 21, 2015 at 1:56 PM, Jim Wilson <jim.wilson@linaro.org> wrote:
>> On 05/20/2015 10:00 AM, H.J. Lu wrote:
>>> By default, alignment of DImode and DFmode is set to 8 bytes.
>>> Intel MCU psABI specifies alignment of DImode and DFmode
>>> to be 4 bytes. I'd like to make get_mode_alignment to return
>>> 32 bits for DImode and DFmode.   Is there a way to adjust alignment
>>> of DImode and DFmode via ADJUST_ALIGNMENT?
>>
>> I see that i386-modes.def already uses ADJUST_ALIGNMENT to change the
>> alignment of XFmode to 4 for ilp32 code.  ADJUST_ALIGNMENT should work
>> the same for DImode and DFmode.  Did you run into a problem when you
>> tried it?
>
> It seems to work.  I don't know why it failed for me last time.
>

Now I remembered.  It doesn't work for complex and decimal
floating point modes:

build/genmodes: config/i386/i386-modes.def:41: no mode "DD"
build/genmodes: config/i386/i386-modes.def:42: no mode "TD"



-- 
H.J.



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