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Date: Sun, 13 Sep 1998 21:09:31 +0200
From: Marc Lehmann <pcg AT goof DOT com>
To: jduan AT boxer DOT chem DOT indiana DOT edu
Cc: beastium <beastium-list AT Desk DOT nl>
Subject: Re: pgcc 1.0.3a: unexplainable -m[arch] flag results
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	beastium <beastium-list AT desk DOT nl>
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In-Reply-To: <35FAF8BC.6A54D0EA@worldnet.att.net>; from Jack Duan on Sat, Sep 12, 1998 at 05:42:04AM -0500
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On Sat, Sep 12, 1998 at 05:42:04AM -0500, Jack Duan wrote:
> 
> flag:   option + -fomit-frame-pointer
> 
>                         compress                uncompress
>                         --------                ----------
> bzip2 v.9b (-O2)        144.390u                27.700u
>   -O2 -m486             142.750u              > 27.690u <
>   -O6                   149.030u                29.830u
>   -O6 -mpentium         150.710u                29.860u
>   -O6 -mpentiumpro      136.570u                28.490u
>   -O6 -m486             139.720u                29.450u
>   -O6 -mamdk6         > 124.360u <              28.540u
> 
> ------------------------ END ------------------------------------
> 
> So, what makes AMDK6 optimization faster than Pentium/PPro running on my
> PII?

Well, I don't know ;) Probably a bug somewhere ;) I will include the
amdk6 support from egcs soon, maybe that improves it further. I'll
investigate this.

>  Also, noticing that '-O2 -m486' is even faster than '-O6 -mpentium'?!!

Thats easy to explain: -mpentium is poison for a ppro/p-ii, even worse than
-m386 or -m486.

      -----==-                                              |
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      ---==---(_)__  __ ____  __       Marc Lehmann       +--
      --==---/ / _ \/ // /\ \/ /       pcg AT goof DOT com       |e|
      -=====/_/_//_/\_,_/ /_/\_\                          --+
    The choice of a GNU generation                        |
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