https://gcc.gnu.org/bugzilla/show_bug.cgi?id=70140
--- Comment #7 from Wilco <wilco at gcc dot gnu.org> --- (In reply to Martin Liška from comment #6) > Created attachment 41772 [details] > Patch candidate > > I'm going to prepare some test-cases for that. Does it look good? Yes, it now inlines small constant sizes. However large and variable sized copies have the wrong return value: void *f1(void *p, void *q) { return __builtin_mempcpy(p, q, 256); } f1: mov x2, 256 b memcpy