Okay, I got the values to 16 at last! I needed to include {$PACKRECORDS
C} as well. It's ultimately very fiddly though.
Gareth aka. Kit
On 21/10/2019 22:53, J. Gareth Moreton wrote:
I'm going to have to keep trying. So far that gets me the following
(some debug lines I inserted into the compiler):
record UCOMPLEX.complex
- alignment = 8
- aggregatealignment = 8
- structalignment = 8
- size = 16
I was wrong about what I said about RECORDMIN=16... the alignment
fields are still equal to 8, but it puts the byte offset of the 2nd
field to 16.
There might be a bug in my vectorcall code that prevents the correct
alignment (plus I need to double-check which alignment field is
which). If there is a bug, I'll post a test and a patch to fix it.
Gareth aka. Kit
On 21/10/2019 20:53, Florian Klämpfl wrote:
Am 21.10.19 um 21:42 schrieb J. Gareth Moreton:
On 21/10/2019 20:00, Florian Klämpfl wrote:
What's the problem with
{$push}
{$codealign RECORDMIN=16}
type complex = record
re : real;
im : real;
end;
{$pop}
?
Hi Florian,
I tried that, but that puts each individual field on a 16-byte boundary
Then do:
{$push}
{$codealign RECORDMIN=16}
type dummyrec = record
b : byte;
end;
{$pop}
type complex = record
case byte of
1 : (
re : real;
im : real
);
2 : (alignmentdummy : dummyrec);
end;
I thought I mentioned this trick even somewhere :)
parameters passed into the function may not be aligned (e.g. when
deferencing a pointer on the heap after calling, say,
"New(complex);"), hence why the compiler can only go by the 8-byte
aggregate alignment.
No. Data is guaranteed to be aligned at it's natural boundary when it
is passed without further information.
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