On 22. Apr 2024, at 07:24, Wang, Xiao W <xiao.w.wang@xxxxxxxxx> wrote: > > Could we change the return types to "int", instead of "unsigned int"? > https://gcc.gnu.org/onlinedocs/gcc/Other-Builtins.html says that these __builtin_* > functions return "int". We could, but changing the signedness breaks assertions in other modules and drivers (e.g., where min() and max() are used) and has quite a few side effects. >> With GCC 13 and defconfig, these changes reduced the size of a test >> kernel image by 5,432 bytes on arm64 and by 248 bytes on riscv; there >> were no changes in size on x86_64, powerpc, or m68k. > > I guess your test is based on 64bit arch, right? Yes, except for m68k.
