On Tue, Aug 4, 2020 at 10:29 PM Mahmood Naderan via Gcc-help <gcc-help@xxxxxxxxxxx> wrote: > Is it possible to modify the basic block reordering algorithm to call the next BB from another function? From what I have seen in -freorder-blocks and -freorder-blocks-algorithm and -freorder-fucntion, it seems that BBs are reordered inside functions, a.k.a intra-function reordering, and not between fucntions, a.k.a inter-functions. > Any nore on that? Putting code from one function inside another function would seriously complicate a lot of stuff, and probably break some stuff too. There is a -freorder-blocks-and-partition option that can move hot blocks to a special hot section and cold blocks to a special cold section. But there are a number of cases where it gets automatically disabled, e.g. in the presence of exception handling, if the function has a section attribute, etc. See the docs for the full list. Jim
