Mailinglist Archive: opensuse-amd64 (278 mails)
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Re: [suse-amd64] Speed comparisons... amd64 vs em64t?
- From: Andi Kleen <ak@xxxxxxx>
- Date: Fri, 1 Oct 2004 15:45:48 +0000 (UTC)
- Message-id: <20041001154547.GA13508@xxxxxxxxxxxxx>
> compiler. All of these compile code that is as much as 70% faster than
> GNU in other-than-linpack benchmarks, & probably average 25-30 % faster.
That's not true on x86-64. The 64bit Integer code generated by gcc
is still extremly competive with other available x86-64 compilers
(e.g. as shown in SpecINT)
For Floating Point intensive code there are some compilers who
do better, but the differences are also not that dramatic.
Of course you will always find some code that one compiler likes
and the other doesn't, that is why in the end you should benchmark
your own application yourself.
-Andi
> GNU in other-than-linpack benchmarks, & probably average 25-30 % faster.
That's not true on x86-64. The 64bit Integer code generated by gcc
is still extremly competive with other available x86-64 compilers
(e.g. as shown in SpecINT)
For Floating Point intensive code there are some compilers who
do better, but the differences are also not that dramatic.
Of course you will always find some code that one compiler likes
and the other doesn't, that is why in the end you should benchmark
your own application yourself.
-Andi
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