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GatoVolador
Apprentice
Joined: 16 Jun 2004
Posts: 268
Location: California, USA
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 Posted: Tue Nov 09, 2004 7:04 am Post subject: Correct -march setting |
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Hello all,
I was checking out my make.conf file and noticed that I've got in my CFLAGS. I've got a Pentium-2 266 and uname -a says | Code: | | Linux yemaya 2.6.8-gentoo-r10 #1 Wed Oct 20 00:39:55 PDT 2004 i686 Pentium II (Klamath) GenuineIntel GNU/Linux |
I was checking out man gcc and noticed the following: | Quote: | | The choices for cpu-type are i386, i486, i586, i686, pentium, pentium-mmx, pentiumpro, pentium2, ... i686 is equivalent to pentiumpro |
So the question is: should I use -march=pentium2 or -march=i686? I realize the difference would probably be small, but I certainly don't mind using my chip's full instruction set.
Any recommendations are appreciated,
Jay |
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bradp_84
n00b
Joined: 06 Nov 2004
Posts: 48
Location: Australia
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| Posted: Tue Nov 09, 2004 7:48 am Post subject: |
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Hi jayb,
The man page for gcc doesn't mention pentium pro as having the MMX instruction set. I don't personally know that it doesn't, but it lists it for the other architectures that do have it. From memory I think the MMX instruction set added another 70 odd instructions to the standard pentium that are pretty good for multimedia stuff.
I'd say move to -march=pentium2 and emerge -e world 
Cheers,
Brad |
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