Opterony vs Xeony - aneb cim a jak prelozit program v C
Jan Houstek
Jan.Houstek na mff.cuni.cz
Úterý Leden 17 11:41:43 CET 2006
On Tue, 17 Jan 2006, Horák Daniel wrote:
>> To myslite vazne, ze intelsky prekladac bude mit optimalizace,
>> ktere pobezi rychleji na Opteronu od AMD nez na Xeonu od Intela? :)
>
> A vy jste to zkousel, jak jsou na tom? Ja taky nic takoveho netvrdim
> (kdyz uz nevidite ten smajlik), protoze tady slo jiny kompilator nez
> GCC.
http://yro.slashdot.org/article.pl?sid=05/07/12/1320202&tid=142&tid=118&tid=123
"In AMD's recient anti-trust lawsuit AMD have examined the Intel compiler
and found that it deliberatly runs code slower when it detects that the
processor is an AMD. "To achieve this, Intel designed the compiler to
compile code along several alternate code paths. ... By design, the code
paths were not created equally. If the program detects a "Genuine Intel"
microprocessor, it executes a fully optimized code path and operates with
the maximum efficiency. However, if the program detects an "Authentic AMD"
microprocessor, it executes a different code path that will degrade the
program's performance or cause it to crash.""
--HH
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