Iain Buclaw: > 1.086s: bfgccjitd-runtime-O2 > 1.139s: bfgccjitd-runtime-O1 > 2.759s: bfgccjitd-O1 > 3.646s: bfgccjitd-O2 > 4.959s: bff-O2 Five times faster than bff is a lot :-) My best timings are usually around two times faster than bff. I guess gccjit is not an average JIT-tter. Bye, bearophile