Re: [boost] [Endian] Performance

Subject: Re: [boost] [Endian] Performance
From: Adder (adder.thief_at_[hidden])
Date: 2011-09-05 23:22:31

Hi there,

If only you had GCC 4.4.3 instead of 4.4.0 for platform (A)... I think
it is that version that introduced __builtin_bswap32 and
__builtin_bswap64.

You can see the results of some benchmarks performed on another
platform (including non-optimized code generated by GCC vs code that
uses the above-mentioned intrinsics) in the link that I gladly respam
here:

  http://adder.iworks.ro/Boost/RawMemory/#Benchmarks

Regarding the importance of performance: what applications do you have in mind ?

Loading a (portable) (binary) configuration file when the program is
launched and saving it back when the program is closed might not
require hand-written Assembler.

A personal firewall application that enthusiastic power use for their
Gigabit cable network and for their 300 Mbps wireless network might be
a different thing.

So is streaming OpenGL RGBA framebuffer data from the video game we
are working on to the MPEG4 encoder which expects reversely formatted
pixels in order to create a YouTube-uploadable demo. In such a case,
the performance of the byte swapper made a significant difference.

Thank you...  (-:

--
Yours truly,
Adder
On 9/6/11, Phil Endecott <spam_from_boost_dev_at_[hidden]> wrote:
> Dear All,
> [...]
> I've tested this on two systems:
> (A): Marvell ARMv5TE ("Feroceon") @ 1.2 GHz, g++ 4.4
> (B): Freescale ARMv7 (i.MX53, Coretex A8) @ 1.0 GHz, g++ 4.6.1
> [...]
> What do people see on other platforms?
> [...]
> How important do we consider performance to be for this library?