lkml.org 
[lkml]   [2000]   [Oct]   [17]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: Patch to remove undefined C code
Also sprach Bernd Schmidt:
} > Looking at the above code, I noticed that there are a lot of ++
} > operations. I rewrote the code as:
} >
} > setup_from[0] = setup_from[1] = eaddrs[0];
} > setup_from[2] = setup_from[3] = eaddrs[1];
} > setup_from[4] = setup_from[5] = eaddrs[2];
} > setup_from += 6;
} >
} > I compiled using "gcc -S -Wall -O2 -fomit-frame-pointer -m486" to generate
} > the assembler code. The old code is 17 instructions long and the new code
} > is 11 instructions. As well as being shorter, simple timing test indicate
} > that the new code is significantly quicker.
}
} This is something the compiler ought to know about.
}
A compiler can only guess so much. Don't look to a compiler to fix poorly
written code...
--
|| Bill Wendling wendling@ganymede.isdn.uiuc.edu
-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 12:41    [from the cache]
©2003-2011 Jasper Spaans