* Segher Boessenkool: > On Wed, Dec 08, 2021 at 04:17:33PM -0700, Jeff Law via Gcc-help wrote: >> On 12/7/2021 3:38 PM, Bradley Lucier via Gcc-help wrote: >> >So I've been investigating whether gcc's -foptimize-sibling-calls >> >option (for which I've found very little documentation) might produce >> >similar results. >> The option has been around for probably 20+ years at this point, you >> just might not have been aware of it. They try, but do not guarantee >> tail call optimization. They have all kinds of checks that might cause >> any particular call site to be rejected for tail call elimination. It's >> enabled by default at O2 or higher. > > (Including -Os.) > > GCC will never not do a tail call if it knows any way to do it. GCC will never do a tail call if the target function is known not to return normally, to preserve the stack backtrace. Thanks, Florian
