No difference; there's now just one toggle for it all (though there still are a few other codegen switches). See also
[link:lorgonblog.spaces.live.com]
(The compiler flags are likely to undergo at least one more big set of changes in a future release to make them more comprehensible & orthogonal.)
It could be useful to give a user more control over the optimizations.
It is not something specific to F#, but it would be great if the program could control how aggressive optimizations the .Net JIT can apply.
For example, if I know that my program would take hundreds of CPU hours, I would compile with fsc.exe -O3, meaning that I don't care if the JIT spends even an hour precompiling my code. Or maybe I can do something like this now? The JIT could, in theory, figure out that some portion of code is the bottleneck and recompile it more aggressively, but I could not see it doing that.
Another option could be ability to control JIT level from by the program itself i.e.
# if (input_size > 1000) then JIT_RECOMPILE -O3 -funroll-loops
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Hi,
When I try to give -O3 to fsc, it reports an error "unrecognized argument: -O3". Is the only optimization options available now are --optimize and --optimize+? Is there any difference between the two?
Thanks,
Vlad