Antoine Pitrou wrote: > Martin v. Löwis <martin <at> v.loewis.de> writes: >> - efficient array indexing: they give shift-and-index back to >> Thumb mode, for a shift by 2, allowing to index arrays with >> 4-byte elements in a single instruction (rather than requiring >> a separate multipy-by-four). Again useful for JIT of array >> access instructions, not applicable to Python - although it >> would be nice if the C compiler knew how to emit that. > > This could be used in PyTuple_GetItem and PyList_GetItem, no? > (assuming Thumb has 4-byte pointers)
Yes - but it would require an assembly version of these functions; I'm skeptical that the savings would be measurable (given that there is also the type check and the range check). OTOH, PyTuple_GET_ITEM could probably be implemented as inline assembly. Regards, Martin _______________________________________________ Python-Dev mailing list Python-Dev@python.org http://mail.python.org/mailman/listinfo/python-dev Unsubscribe: http://mail.python.org/mailman/options/python-dev/archive%40mail-archive.com
