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On Thursday 23 November 2006 12:58, Jan Jitse Venselaar wrote: |
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> ... have you benchmarked in any way the effect of all these |
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> optimizations on the programs you run? You basically do -Os and then turn |
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> almost everything on which differs -O2 from -Os, negating the size |
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> difference, plus some extra very experimental flags, which might increase |
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> or decrease performance (sorry, but GCC works that way, extra |
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> optimizations could actually be pessimizations), and probably break some |
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> programs. |
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You may have seen some discussion of compiler optimisations on this list, in |
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which a set of flags have been offered and some people have played with |
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them. I thought I'd have a go, and was reporting what I'd found. In light |
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of what you say, I think I'll just go back to a simple set of flags |
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(-march=k8 -Os -pipe) and leave it at that. And no, I hadn't noticed any |
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performance improvement with all those flags - another good reason for |
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reverting. Better, probably. Thanks for the advice. |
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-- |
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Rgds |
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Peter |
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-- |
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