https://gcc.gnu.org/bugzilla/show_bug.cgi?id=114324
--- Comment #4 from mjr19 at cam dot ac.uk --- Created attachment 57713 --> https://gcc.gnu.org/bugzilla/attachment.cgi?id=57713&action=edit Second testcase, very similar to first Thank you for looking into this. The real code in question has more than one loop which suffers a slow-down with gfortran 13/14 when compared to 12, and I suspect it is the same underlying issue in all cases. I attach another test case, which seems very similar. The odd logic surrounding the initialisation of ci is to replicate the fact that in the real code the sign of ci depends on an argument which I have dropped, and so the compiler cannot optimise it away completely. For this case, gfortran 12 and ifort produce very similar performance, gfortran 13 is over 20% slower, and ifx slower still.
