How should _Decimal64 and _Decimal128 be aligned on stack?

[H.J. Lu]

Hi David,

I added gcc mailing list.

H.J.
On Tue, Apr 1, 2008 at 10:53 AM, Dave Kreitzer
<david.l.kreitzer@intel.com> wrote:
>
>  > I think we should align _Decimal64 and _Decimal128 to their natural
>  > alignments when passing a function. The same should apply to x86-64
>  > when they are passed on stack.
>  >
>
>  Rather than aligning _Decimal64 to its natural boundary, I think it is
>  more sensible to be consistent with the existing 8-byte scalar types,
>  i.e. double and long long.  That would mean aligning _Decimal64 to 4
>  bytes within structures and when passing to a function.
>

That means to change the default alignment of  _Decimal64 to 4 bytes in
32bit mode.

>  For _Decimal128, I agree with the conclusion to align to 16-bytes
>  within structures and as outgoing arguments.  That behavior is
>  consistent with the existing data types __m128, __m128d, and __m128i.
>
>  Dave Kreitzer
>  IA-32 and Intel 64 Code Generation
>  Intel Compiler Lab
>
>
>
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