https://gcc.gnu.org/bugzilla/show_bug.cgi?id=86005
--- Comment #6 from Jim Wilson <wilson at tuliptree dot org> --- On Thu, 2018-05-31 at 15:07 +0000, foom at fuhm dot net wrote: > (But also, why doesn't it implement __atomic_add_fetch inline?) If you don't have atomic instructions, then we call an out-of-line function that uses locks. If you have atomic instructions, and it is a 32/64-bit operation, then we inline it. If you have atomic instructions, and it is a 8/16-bit operation, then we call a lock free out-of-line function that uses a sequence of instructions to implement it using 32/64-bit atomic instructions. And as mentioned previously, I have an unfinished prototype patch to fix this by emitting the sequence of instructions inline.
