Re: -fast for G4 + G5
Re: -fast for G4 + G5
- Subject: Re: -fast for G4 + G5
- From: Brian Barnes <email@hidden>
- Date: Mon, 15 Dec 2003 09:59:23 -0500
Dietrich Epp wrote:
On Dec 13, 2003, at 10:03 PM, Brian Barnes wrote:
I'm not sure about the cpu numbering scheme, so what's the best cpu
type for -fast if you want the resulting code to run on both G4 + G5.
I should say ... ANY G4. -mcpu=7450 or -mcpu=7400?
From:
file:///Developer/Documentation/DeveloperTools/gcc-3.3/gcc/Optimize-
Options.html
http://developer.apple.com/documentation/DeveloperTools/gcc-3.3/gcc/
Optimize-Options.html
[clipped]
I know that :) There are two -mcpu settings for G4s, "7400" and "7500" (mine being the older, 7400, I still can't find where this is documented per model). The question is, which -fast documentation doesn't answer, can I use -mcpu=7400 with fast (I don't have other machines to test, so I need to verify it'll work not just on my machine), or is -mcpu=7450 compatiable with the 7400 setting, and vice-versa? Which is more optimal if I want to cover BOTH classes of machines?
The -fast doc says to use "7450" for G4, but I know there are a bunch of slightly different variations, and, once again, I don't want to get into trouble when I ship.
[>] Brian
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