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Certain program have support for either of these extentions. The |
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program will most likely use the best one for the job. |
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|
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They can be mutually exclusive, however, if you use the CFLAG |
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-mfpmath=sse,387. As far as I know it, it will try to use SSE |
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instructions for math where possible, in detriment of using the 387 |
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math co-processor. But this only get any advantage when using AMD64 |
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processors. |
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|
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I never tested it, I just copied what the Gentoo Wiki says about it. ;P |
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|
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2006/1/12, Willie Wong <wwong@×××××××××.edu>: |
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> On Thu, Jan 12, 2006 at 03:09:40PM -0700, Penguin Lover Tom Smith squawked: |
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> > Are these flags mutually exclusive? |
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> > |
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> > I know, for example, that if I have a Pentium II that the MMX flag |
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> > should apply while the sse and sse2 flags would not. |
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> > |
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> > But what if I have a Pentium III or IV? Would I only use the most recent |
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> > "optimization" or do I need to add all three to take advantage of each one? |
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> > |
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> > I checked the USE flag descriptions and there wasn't anything indicating |
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> > indicating whether the can or should be used together. |
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> > |
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> Not quite sure how it works officially. But I run a Pentium IV, and I |
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> have mmx mmxext sse sse2 enabled, so they are at least NOT mutually |
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> exclusive. |
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> |
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> W |
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> -- |
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> All science is either physics or stamp collecting. |
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> ~Ernest Rutherford |
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> Sortir en Pantoufles: up 61 days, 15:40 |
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> -- |
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> gentoo-user@g.o mailing list |
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> |
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> |
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|
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-- |
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