Re: Plataforma destino de un ejecutable (i386/i486/i586/i686)

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#17231

From: Gonzalo Paniagua Javier
Date: Fri, 04 Feb 2000 00:00

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rvm <rvm@XXlinuxfan.com> escribi� en es.comp.os.linux.programacion:
> `-mcpu=CPU TYPE'
>      Assume the defaults for the machine type CPU TYPE when scheduling
>      instructions.  The choices for CPU TYPE are: `i386', `i486',
>      `i586' (`pentium'), `pentium', `i686' (`pentiumpro') and
>      `pentiumpro'. While picking a specific CPU TYPE will schedule
>      things appropriately for that particular chip, the compiler will
>      not generate any code that does not run on the i386 without the
>      `-march=CPU TYPE' option being used.

> `-march=CPU TYPE'
>      Generate instructions for the machine type CPU TYPE.  The choices
>      for CPU TYPE are: `i386', `i486', `pentium', and `pentiumpro'.
>      Specifying `-march=CPU TYPE' implies `-mcpu=CPU TYPE'.

> Si no he entendido mal con la opci�n mcpu se realizan algunas
> optimizaciones, pero el ejecutable sigue funcionando en un 386 (�o no?,
> la verdad es que no he entendido bien la frase).

	Efectivamente. Para que genere (quiz�s) c�digo que no funcione en un
386, hay que usar, por ejemplo, '-march=pentium' (que implica
-mcpu=pentium).

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From: Gonzalo Paniagua Javier <gpanjav@QUITAetsi.tel.uva.esPAM>
Subject: Re: Plataforma destino de un ejecutable (i386/i486/i586/i686)
Date: 2000/02/04
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