Rafael Espíndola rafael.espindola@gmail.com
Wed May 27 15:26:00 GMT 2015

• Previous message (by thread): [patch] Use unaligned access on x86_64
• Next message (by thread): [patch] Use a std::vector instead of a std::map to hold Input_merge_map
• Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

---

ping

On 20 May 2015 at 09:01, Rafael Espíndola <rafael.espindola@gmail.com> wrote:
> ping.
>
> On 27 April 2015 at 15:09, Rafael Espíndola <rafael.espindola@gmail.com> wrote:
>> I tested this on my linux workstation with a debug build of clang. The
>> results are still very interesting.
>>
>> The perf logs are attached.
>>
>> Cheers,
>> Rafael
>>
>>
>> On 24 April 2015 at 10:54, Rafael Espíndola <rafael.espindola@gmail.com> wrote:
>>> Hi,
>>>
>>> x86_64 has exquisite support for unaligned loads. It is a shame not to use it.
>>>
>>> The attached patch avoids aligning archive members on x86_64. The
>>> results when linking clang are very interesting:
>>>
>>> * massif reports that the malloc memory usage goes from 331,295,192
>>> bytes to just 133,415,136 bytes.
>>>
>>> * the linking time (30 runs average) goes from
>>>
>>> 1.310065610 seconds time elapsed ( +-  0.19% )
>>>
>>> to
>>>
>>> 1.162564763 seconds time elapsed ( +-  0.14% )
>>>
>>>
>>> Cheers,
>>> Rafael
>>>
>>>
>>> 2015-04-24  Rafael Ávila de Espíndola <rafael.espindola@gmail.com>
>>>
>>> * fileread.cc (find_or_make_view): Don't align on x86_64.

---

• Previous message (by thread): [patch] Use unaligned access on x86_64
• Next message (by thread): [patch] Use a std::vector instead of a std::map to hold Input_merge_map
• Messages sorted by: [ date ] [ thread ] [ subject ] [ author ]

---

More information about the Binutils mailing list