[mdlug] [Fwd: Re: [opensuse] 64 bit vrs 32 bit advantagesspeedetc.]

[David Lane]

It it an Intel Compiler?

David 


----- Original Message ----
From: "Ingles, Raymond" <Raymond.Ingles at compuware.com>
To: MDLUG's Main discussion list <mdlug at mdlug.org>
Sent: Wednesday, October 31, 2007 2:57:36 PM
Subject: Re: [mdlug] [Fwd: Re: [opensuse] 64 bit vrs 32 bit advantagesspeedetc.]


> From: David Lane

> Compilers produce executable binary op code.  If I were the Intel
 Compiler
> Project Manager I would not let ant one spend any time for AMD CPU's.
 I
> would however have to find other employment If I were told to "Slow
 Down"
> non-Intel CPU's.

> And Yes I will have to read the article.

 Good, because that's what they did. Their compiler checks for
 SSE/SSE2/SSE3
capability, and uses it... if its a "GenuineIntel" CPU. But if it's any
 other
kind, it doesn't use SSE instructions... even if the CPU uses the
 standard
method to inform applications of SSE capability. I.e. even though the
 AMD
processors can run SSE code - and use Intel's own standard for
 specifying
that capability - the Intel compilers refuse to use SSE instructions on
 AMD
processors.

 This is a deliberate incompatibility. At the webpage I referred to,
 the author
has scripts that patch either generated executables or the compiler to
 allow
SSE on AMD. The programs run just fine.

 Sincerely,

 Ray Ingles                                         (313) 227-2317

 In October 1965, the Selective Service announced that married men
  without children could then be drafted. Exactly nine months and
      two days later... [Dick Cheney's] first child was born.
 http://dir.salon.com/politics/feature/2000/08/01/draft/index.html
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