[Info-vax] x86-64 data aligment / faulting

[Arne Vajhøj]

On 3/16/2022 9:15 AM, John Reagan wrote:
> On Wednesday, March 16, 2022 at 8:36:09 AM UTC-4, John Dallman wrote:
>> In article <4ff9c36f-5aef-4753... at googlegroups.com>,
>> xyzz... at gmail.com (John Reagan) wrote:
>>> On x86, at this point, we don't even turn on the trapping. I'm
>>> sure there are hardware performance registers that count them
>>> globally but OpenVMS doesn't ask about that.

>> Presumably the compilers - both GEM-based and LLVM - will use natural
>> alignment by default?

> Our Alpha and Itanium frontends are already natural alignment by default (COBOL
> is the exception).  Nothing changed for x86.

That is what we expect.

Changing defaults could break index-sequential file access code
with copied over files or mixed architecture cluster.

Arne