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I'm not sure what you mean by "use" check. If you compile this with LTO and multiple modules, and guarantee that you have the main function, yes, you could optimize this. In all other cases, it's not possible to eliminate any of the remaining loads or stores you see, because you have no guarantee about what else could read it. Heck, a conforming implementation of printf could

Thanks for your reply. So, we don't do any "use" check (for globals variables) beyond a module scope. If so, it answers my question. On Fri, Jan 4, 2013 at 6:53 PM, Justin Holewinski < justin.holewinski at gmail.com> wrote: > Since a, b, and c are globals, how does the optimize *know* they are not > used elsewhere (e.g. another module)? > -------------- next part

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