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Re: glibc 2.21 - Machine maintainers, please test your machines.
- From: "H.J. Lu" <hjl dot tools at gmail dot com>
- To: Andreas Schwab <schwab at suse dot de>
- Cc: Chris Metcalf <cmetcalf at ezchip dot com>, Torvald Riegel <triegel at redhat dot com>, "Carlos O'Donell" <carlos at redhat dot com>, GNU C Library <libc-alpha at sourceware dot org>, David Miller <davem at davemloft dot net>, Richard Henderson <rth at redhat dot com>, Mike Frysinger <vapier at gentoo dot org>, "Joseph S. Myers" <joseph at codesourcery dot com>, Kaz Kojima <kkojima at rr dot iij4u dot or dot jp>, Thomas Schwinge <thomas at codesourcery dot com>, Marcus Shawcroft <marcus dot shawcroft at linaro dot org>, Chung-Lin Tang <chunglin_tang at mentor dot com>, Adhemerval Zanella <azanella at linux dot vnet dot ibm dot com>, Andreas Krebbel <krebbel at linux dot vnet dot ibm dot com>
- Date: Mon, 26 Jan 2015 06:53:58 -0800
- Subject: Re: glibc 2.21 - Machine maintainers, please test your machines.
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On Mon, Jan 26, 2015 at 6:51 AM, Andreas Schwab <schwab@suse.de> wrote:
> "H.J. Lu" <hjl.tools@gmail.com> writes:
>
>> On Mon, Jan 26, 2015 at 5:48 AM, Andreas Schwab <schwab@suse.de> wrote:
>>> "H.J. Lu" <hjl.tools@gmail.com> writes:
>>>
>>>> On Mon, Jan 26, 2015 at 1:24 AM, Andreas Schwab <schwab@suse.de> wrote:
>>>>> "H.J. Lu" <hjl.tools@gmail.com> writes:
>>>>>
>>>>>> It doesn't change the size, only increases alignment from 4 bytes to 8 bytes.
>>>>>
>>>>> Alignment is part of the ABI.
>>>>>
>>>>
>>>> For x32, we can increase alignment from 4 bytes to 8 bytes without breaking
>>>> existing binaries.
>>>
>>> The compiler may generate code to take advantage of the bigger
>>> alignment, which will fail if not fulfilled (this is not just about
>>> unaligned accesses).
>>>
>>
>> Failure shouldn't happen on x32 in this case.
>
> Which part of "this is not just about unaligned accesses" didn't you
> understand?
>
Please elaborate. An example/testcase will be more helpful.
Thanks.
--
H.J.
- References:
- glibc 2.21 - Machine maintainers, please test your machines.
- Re: glibc 2.21 - Machine maintainers, please test your machines.
- Re: glibc 2.21 - Machine maintainers, please test your machines.
- Re: glibc 2.21 - Machine maintainers, please test your machines.
- Re: glibc 2.21 - Machine maintainers, please test your machines.
- Re: glibc 2.21 - Machine maintainers, please test your machines.
- Re: glibc 2.21 - Machine maintainers, please test your machines.
- Re: glibc 2.21 - Machine maintainers, please test your machines.
- Re: glibc 2.21 - Machine maintainers, please test your machines.
- Re: glibc 2.21 - Machine maintainers, please test your machines.
- Re: glibc 2.21 - Machine maintainers, please test your machines.
- Re: glibc 2.21 - Machine maintainers, please test your machines.
- Re: glibc 2.21 - Machine maintainers, please test your machines.
- Re: glibc 2.21 - Machine maintainers, please test your machines.