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zaklad
n00b
Joined: 11 May 2006
Posts: 40
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 Posted: Thu Jul 20, 2006 4:07 pm Post subject: USE flags for PII Mobile |
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Hi,
What USE flags should be used for a mobile PII?
Should I use CFLAGS="-march=pentium2 -Os ... " or is there something else for mobile proccessors?
Also, does it matter how much ram I have (for the -Os)? As far as I understand the s means the packeges are optimized for size hence suitable for computers with little memory. If I have 128MB or 256MB should I still be using the -Os optimization or should I use -O2?
Thanks,
Gil |
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GoofballJM1
Guru
Joined: 22 Mar 2004
Posts: 392
Location: Denver, CO USA
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| Posted: Thu Jul 20, 2006 5:16 pm Post subject: |
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You are asking two questions, right?
| Quote: | | What USE flags should be used for a mobile PII? |
Whatever your needs require. USE flags are related to what software you are using, not your CPU's architecture.
| Quote: | | Should I use CFLAGS="-march=pentium2 -Os ... " or is there something else for mobile proccessors? |
That should be fine. The only mobile processors you are going to have to change CFLAGS on are the newer ones (ie. Pentium M's).
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zaklad
n00b
Joined: 11 May 2006
Posts: 40
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| Posted: Thu Jul 20, 2006 6:16 pm Post subject: |
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| GoofballJM1 wrote: |
That should be fine. The only mobile processors you are going to have to change CFLAGS on are the newer ones (ie. Pentium M's). |
Thanks GoofballJM1!
What about the optimization part?
I currently have 164MB and are thinking of upgrading to 256MB. Should I still be using the -Os for this amount of memory?
(The -Os is about small memory, isn't it?)
Thanks again! |
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Lupin_the_3rd
Apprentice
Joined: 03 Apr 2005
Posts: 168
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| Posted: Fri Jul 21, 2006 2:42 am Post subject: |
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| GoofballJM1 wrote: | You are asking two questions, right?
| Quote: | | What USE flags should be used for a mobile PII? |
Whatever your needs require. USE flags are related to what software you are using, not your CPU's architecture.
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Not necessarily. "-fomit-frame-pointer" frees up a CPU register which can give you a little performance boost on x86 (since x86 has so few registers). This has little or no effect however on most RISC platforms which typically have a lot of available CPU registers (far more than x86 anyways). Also, the GCC optimizations have different effects on different CPU's - on some arch's, you get a big boost, on others you simply get longer compile times with no noticible performance boost.
Just FYI.
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