On Fri, Nov 8, 2013 at 6:13 PM, Igor Bukanov <i...@mir2.org> wrote: > On 9 November 2013 00:08, Huon Wilson <dbau...@gmail.com> wrote: > > `&T` is pointer-sized but `T` isn't always. > > If the size of &T is not known, then obviously such optimization is > not applicable, The point is about &T where T is fixed-sized 1-4 word > thing. > > > > > (I believe that LLVM will optimise references to pass-by-value in certain > > circumstances; presumably when functions are internal to a compilation > > unit.) > > But what about declaring that such optimization is always valid and > even require it on the level of ABI?
If you're using dynamic linking, the call overhead makes the cost of having an extra pointer in the CPU cache irrelevant.
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