On Wed, 17 Jan 2018, Martin Jambor wrote: > 3?) Joseph Myers brought up idea to do "built-in functions for TS 18661 > floating-point functions - which has the feature that there are a > lot of similar built-in functions for C99/C11 functions to serve as > a guide for how to implement things)" ...Joseph, would you be > willing to mentor it?
Yes, provided at least one other mentor is available as well as I may not be around all the time during the GSoC period, including one of the evaluation periods. (The outline I put on the wiki page is: GCC supports built-in functions for math.h and complex.h functions in the C99/C11 standards (both folding calls for constant arguments, and expanding inline when the processor supports appropriate functionality). More such functions have been added in ISO/IEC TS 18661, supporting features of IEEE 754-2008. It would be useful to have built-in functions for those, both folding for constant arguments, and expanding inline where appropriate (e.g. for roundeven and the functions rounding result to narrower type, on some processors; roundeven can be inlined on x86 for SSE4.1 and later, and the narrowing functions on IA64 and POWER8, for example). Existing built-in functions would provide a guide for how to do this. This project has the feature that there are lots of smaller subprojects each of which would be a useful enhancement to GCC, so a student could start off with e.g. roundeven built-in functions, closely following how existing code handles round / floor / ceil / trunc, before going on to more complicated functions such as the narrowing ones or the fromfp functions - with scope for functions from TS 18661-3 and TS 18661-4 if they run out of useful functions from TS 18661-1. If a student were interested I could provide more detailed lists of possible subprojects.) -- Joseph S. Myers jos...@codesourcery.com