lkml.org 
[lkml]   [1999]   [Jan]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: -fno-strength-reduce
On Fri, Jan 22, 1999 at 07:06:37PM +0000, Philipp Rumpf wrote:
> On Fri, Jan 22, 1999 at 10:12:49AM -0500, Arvind Sankar wrote:
> > specs be? The defaults are bigger than what are currently specified
> > (currently they are 32 bit alignment for loops, jumps and functions).
> > The default is 64-bit on i486 and up, and if gas >= 2.8 is used (likely)
> > then it is either 64-bit or 128-bit if you are less than 64 bits from
> > a 128-bit boundary. Wouldn't 64-bit alignment be faster for Ppros?
>
> The reason for 128 bit boundaries are the 32 byte cache lines. It is much more
> likely to get split when one uses 64 bits. [while using 256 bit = 32 byte align-
> ment would be overkill probably]. I may be wrong though.

I probably wasn't very clear as to what I meant. I was referring to the fact that
64-bit alignment would be faster than the current 32-bit alignment specified
in the arch/i386/Makefile. If 128 is even faster, so be it.

-- arvind

-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.rutgers.edu
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 13:49    [W:0.060 / U:0.132 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site