* -mfpmath=sse question
@ 2004-01-20 17:35 Neal D. Becker
2004-01-20 18:04 ` Kelley Cook
0 siblings, 1 reply; 2+ messages in thread
From: Neal D. Becker @ 2004-01-20 17:35 UTC (permalink / raw)
To: gcc
On Athlon-xp, what is the best combination of switches?
I'm using -mfpmath=sse -msse -m3dnow.
Is this correct? Or is -msse redundant?
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* Re: -mfpmath=sse question
2004-01-20 17:35 -mfpmath=sse question Neal D. Becker
@ 2004-01-20 18:04 ` Kelley Cook
0 siblings, 0 replies; 2+ messages in thread
From: Kelley Cook @ 2004-01-20 18:04 UTC (permalink / raw)
Cc: GCC
> On Athlon-xp, what is the best combination of switches?
That is not an easy question to answer as lots of factors about your
code will come into play. Using "-O2" is generally a good start.
>
> I'm using -mfpmath=sse -msse -m3dnow.
>
> Is this correct? Or is -msse redundant?
This question however is since '-mfpmath=sse' does not imply '-msse' nor
'-m3dnow'.
That being said, assuming that you are looking for compling a binary
that will only run on an athlon-xp (or x86-64) machine than using "-O2
-march=athlon-xp -mfpmath=sse" would imply both '-msse' and '-m3dnow'
and will schedule for that particular processor.
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2004-01-20 17:35 -mfpmath=sse question Neal D. Becker
2004-01-20 18:04 ` Kelley Cook
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