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Hi, I'm using optim with box constraints to MLE on about 100 data points. It goes quite slow even on 4GB machine. I'm wondering if R has any faster implementation? Also, if I'd like to impose equality/nonequality constraints on parameters, which package I should use? Any help would be appreciated. Thank you. rc

...hould be allowed, modulo now-unusual architectures with segmented memory or where the pointer representations are different. Then there's a question, which we would hope applies only in the case without those casts, about whether -fstrict-aliasing will treat comparisons with type mismatches as nonequal, e.g. - "Depends on strict-aliasing flags? I think LLVM TBAA might optimise this sort of check away?" - "There are a lot of examples of this, in particular in libc, or possibly implementations of vtables." ### [7/15] Pointer comparison across different allocations *...

...nusual architectures > with > segmented memory or where the pointer representations are different. > > Then there's a question, which we would hope applies only in the case > without those casts, about whether -fstrict-aliasing will treat > comparisons with type mismatches as nonequal, e.g. > > - "Depends on strict-aliasing flags? I think LLVM TBAA might optimise > this sort of check away?" > > - "There are a lot of examples of this, in particular in libc, or > possibly implementations of vtables." > > > > > ### [7/15]...

...segmented memory or where the pointer representations are different. > >> > >> Then there's a question, which we would hope applies only in the case > >> without those casts, about whether -fstrict-aliasing will treat > >> comparisons with type mismatches as nonequal, e.g. > >> > >> - "Depends on strict-aliasing flags? I think LLVM TBAA might optimise > >> this sort of check away?" > >> > >> - "There are a lot of examples of this, in particular in libc, or > >> possibly implementations of vt...

...ctures with >> segmented memory or where the pointer representations are different. >> >> Then there's a question, which we would hope applies only in the case >> without those casts, about whether -fstrict-aliasing will treat >> comparisons with type mismatches as nonequal, e.g. >> >> - "Depends on strict-aliasing flags? I think LLVM TBAA might optimise >> this sort of check away?" >> >> - "There are a lot of examples of this, in particular in libc, or >> possibly implementations of vtables." >> >...