search for: intentionn

...do bit-casting in C the usual way is to very carefully use an union which informs the compiler that there will be aliasing... > Those programs are buggy and should be fixed. Totally agree. Making such ugly things work means lots of optimizations can't be performed. I wonder if llvm intentionnally generates this spurious alias (to make badly written code work) or is it just the optimizer not being smart enough yet ?...

On Jun 17, 2010, at 12:22 AM, Eli Friedman wrote: > On Wed, Jun 16, 2010 at 11:14 PM, Pierre C <lists at peufeu.com> wrote: >>> There are essentially two ways to "solve" this issue: one is >>> type-based alias analysis, i.e. assuming "double" and "int" don't >>> alias; LLVM doesn't implement this at the moment. The other

...friendly as we can in helping people find and fix these issues. Tracking down a bug like that in user code is an absolute nightmare. Specifically, we should issue good diagnostics for problems of this sort, from the compiler and/or from the static analyzer, whenever possible. > I wonder if llvm intentionnally generates this spurious alias (to make badly written code work) or is it just the optimizer not being smart enough yet ?... I'm not 100% sure, but I suspect it's the latter. -Jim

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