aaron.ballman added a comment. In https://reviews.llvm.org/D22725#493942, @JDevlieghere wrote:
> In https://reviews.llvm.org/D22725#493940, @aaron.ballman wrote: > > > > Using std::copy opens up the possibility of type-aware optimizations > > > which are not possible with memcpy. > > > > > > To my knowledge, those type-aware optimizations are for transforming copies > > involving trivially-copyable types into calls to memcpy(). What other > > optimizations does this check enable? > > > I might be mistaken, but I understood that a call to std::copy (whether or > not specialized for certain types) might get inlined, while a call to memcpy > is typically not. The optimizer can be quite smart about memcpy(). For instance: https://godbolt.org/g/INfHWE If we know of specific cases where std::memcpy() is used, but std::copy() will provide better performance metrics, that would be really interesting to know. Repository: rL LLVM https://reviews.llvm.org/D22725 _______________________________________________ cfe-commits mailing list cfe-commits@lists.llvm.org http://lists.llvm.org/cgi-bin/mailman/listinfo/cfe-commits
