https://gcc.gnu.org/bugzilla/show_bug.cgi?id=118544
Andrew Pinski <pinskia at gcc dot gnu.org> changed: What |Removed |Added ---------------------------------------------------------------------------- Component|rtl-optimization |tree-optimization --- Comment #2 from Andrew Pinski <pinskia at gcc dot gnu.org> --- The unroll 2 is correct, it was unrolled one time; likewise 3 is unrolled twice, etc. I suspect you are missunderstanding what the diagnostic is saying, it is saying unrolled the loop one extra iteration. Now `#pragma GCC unroll(5)` is just a misreporting of the number of iterations; it was fully unrolled.