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Well, if they're /not/ mutually exclusive, another question that comes |
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up is... |
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|
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If a program is compiled with sse or sse2 support on a Pentium II, will |
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the program run slower than it otherwise would? (Some of the programs I |
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have are compiled and then distributed to servers with different |
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CPUs--P-IIs and P-IVs, mainly.) |
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|
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Raphael Melo de Oliveira Bastos Sales wrote: |
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|
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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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> |
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> |
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>>On Thu, Jan 12, 2006 at 03:09:40PM -0700, Penguin Lover Tom Smith squawked: |
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>> |
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>> |
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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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>>> |
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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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> |
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> |
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> |
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-- |
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gentoo-user@g.o mailing list |