gcc vs. icc

[Patrick Dupre]

Hello,

I observed better performances by using icc comparer to gcc-4.4.5 (50 to 
100%).
Of course the binary code is bigger.

Is it normal ?

Regards.

-- 
---
==========================================================================
  Patrick DUPRÉ                      |   |
  Department of Chemistry            |   |  Phone: (44)-(0)-1904-434384
  The University of York             |   |  Fax:   (44)-(0)-1904-432516
  Heslington                         |   |
  York YO10 5DD  United Kingdom      |   |  email: patrick.dupre(a)york.ac.uk
==========================================================================

[Tom Horsley]

On Fri, 29 Apr 2011 19:42:37 +0100 (BST)
Patrick Dupre wrote:

>  Is it normal ? 
That was what we found when testing icc as well. I suspect
only the lunatics that designed such an insane architecture
actually know how to generate the best possible code for it :-).

[Genes MailLists]

On 04/29/2011 02:57 PM, Tom Horsley wrote:

>  That was what we found when testing icc as well. I suspect
>  only the lunatics that designed such an insane architecture
>  actually know how to generate the best possible code for it :-). 
  icc has support for improved floating point performance - tho I have
never seen significant differences for the integer case.

  See, for example this from 2007 on #pragma ivdep:

   http://gcc.gnu.org/bugzilla/show_bug.cgi?id=33426

  Be nice if gcc had similar optimizations.