Vectorizer friendly code

[Domagoj Šarić]

• use aligned storage (also statically attributed as such, with compiler specific attributes, not just allocated as aligned)
• mind vectorcall and its ability to pass and return tuples! ​http://blogs.msdn.com/b/vcblog/archive/2013/07/12/introducing-vector-calling-convention.aspx
• use native/builtin arbitrary sized vectors

​http://gcc.gnu.org/onlinedocs/gcc/Vector-Extensions.html ​http://clang.llvm.org/docs/LanguageExtensions.html#vectors-and-extended-vectors

[John Maddock]

Can you please explain what you had in mind here? Note that cpp_int's are not simply arrays, so cannot be passed by value using a __vectorcall as far as I can see.

Use of builtin vector types might be interesting, but the only operations I can see being easily vectorised are the bitwise operations? I suspect the problems may outweigh the benefits here: for example gcc only supports array sizes that are powers of 2, I'm not certain the arrays support 64-bit chunks either...

[Domagoj Šarić]

Sorry, still had no time to revisit this (and answer the questions above), however I ran into this recently: ​https://gcc.gnu.org/onlinedocs/gcc/Integer-Overflow-Builtins.html ​http://clang.llvm.org/docs/LanguageExtensions.html#checked-arithmetic-builtins and thought you may find it useful (while on the topic of compiler extensions)...