On Mon, Nov 14, 2005 at 11:38:56PM +0000, Chris wrote: > Kris Kennaway wrote: > >P.S. -funroll-loops and -ffast-math are commonly used by people who > >don't understand what they mean but like the thrill it gives them to > >compile their application with secret optimizations (e.g. the word > >"fast" makes them feel excited). However, the former is often not > >actually an optimization (which is why it's not on by default), and > >the latter can cause incorrect computations (but I think it's > >completely irrelevant in the kernel which does not do FP math). > > Just out of curiosity, what would people who know what they are doing > use them for? -funroll-loops sounds like an amusement park :P
They would carefully test to see whether it helped their specific CPU-intensive application, and only use it if so. Kris
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