topic Re: Fortran regression ICE in Intel(R) 64, Version 2021.12.0 in Intel® Fortran Compiler

Fortran regression ICE in Intel(R) 64, Version 2021.12.0

Juergen_R_R — Sun, 07 Apr 2024 20:31:29 GMT

There is a regression with the Intel oneAPI 2024 Fortran compiler Intel(R) 64, Version 2021.12.0,

which had been working in 2021.10.0, and it also works with ifx (as well as gfortran and nagfor).

Compilation leads to an internal compiler error (ICE).

module m1 implicit none private type :: t1 integer, dimension(:), allocatable :: flst integer :: n_in = 0 end type t1 type :: t2 type(t1), dimension(:), allocatable :: tt integer :: n_in = 0 contains procedure :: s1 => t2_s1 end type t2 contains subroutine t2_s1 (rt, ttt) class(t2), intent(in) :: rt type(t1), intent(out), dimension(:), allocatable :: ttt integer :: n_real integer :: i_real n_real = size (rt%tt) allocate (ttt (0)) do i_real = 1, n_real call s3 (i_real, ttt) end do contains subroutine s3 (i_real, ttt) integer, intent(in) :: i_real type(t1), intent(inout), dimension(:), allocatable :: ttt type(t1) :: ttt_tmp associate (tt => rt%tt(i_real)) ttt_tmp = s2 (tt, rt%n_in) ttt = [ttt, ttt_tmp] end associate end subroutine s3 end subroutine t2_s1 function s2 (flv1, n_in) result(flv2) type(t1), intent(in) :: flv1 integer, intent(in) :: n_in type(t1) :: flv2 integer :: n n = size (flv1%flst) allocate (flv2%flst (n)) flv2%n_in = n_in end function s2 end module m1

Re: Fortran regression ICE in Intel(R) 64, Version 2021.12.0

jdelia — Sun, 07 Apr 2024 21:01:55 GMT

Dear Juergen_R_R,

Well, at least with:

$ ifx --version
ifx (IFX) 2024.1.0 20240308
Copyright (C) 1985-2024 Intel Corporation. All rights reserved.

$ ifx -O2 -error-limit 4 -e03 -fimf-arch-consistency=true -fimf-precision=high -finline-functions -fp-model consistent -fpp -fpe-all=1 -ipo -mavx -mtune=generic -m64 -parallel-source-info=1 -qmkl -qopenmp -qopt-report=3 -standard-semantics -std18 -traceback -WB -warn all -xHost -c testcase-0207.f90
$

Regards,

Jorge.

Re: Fortran regression ICE in Intel(R) 64, Version 2021.12.0

Juergen_R_R — Sun, 07 Apr 2024 21:05:19 GMT

Yes, I already mentioned that it works with ifx. However, ifx still doesn't work fully with our software. That's the reason why we still have to rely on ifort

Re: Fortran regression ICE in Intel(R) 64, Version 2021.12.0

Barbara_P_Intel — Mon, 08 Apr 2024 21:32:59 GMT

@Juergen_R_R, I also get ICE with the current nightly build with ifort. Since it compiles ok with ifx, it will be hard to get a compiler engineer to look at it with all the other bug fixes going on. The plan is that the last release of ifort is mid 2024.

Do you know that you can mix and match object files and .mod files between ifx and ifort, unless you compile with -ipo? That may help you move along.

Re: Fortran regression ICE in Intel(R) 64, Version 2021.12.0

Juergen_R_R — Mon, 08 Apr 2024 21:37:30 GMT

That is very bad news. I think, even 2021.11.0 was ok, so the regression must have happened pretty recently. As ifx still has some major problems and extrapolating from past experience, this means that we probably have to discard Intel compilers for 1-2 years until all the stuff is fixed. At the moment, I'm trying to isolate another problem, where ifx produces wrong code. Mixing code is no option as this cannot be automized.

Re: Fortran regression ICE in Intel(R) 64, Version 2021.12.0

Barbara_P_Intel — Tue, 09 Apr 2024 19:11:04 GMT

I did some poking around. The ifort ICE you reported is a duplicate of another bug. Look for the ICE to melt in 2024.2 available in mid-2024!

Re: Fortran regression ICE in Intel(R) 64, Version 2021.12.0

Juergen_R_R — Tue, 09 Apr 2024 19:12:42 GMT

Barbara, that's great news!! A lot of motivation to invest into debugging for me and my team!

Re: Fortran regression ICE in Intel(R) 64, Version 2021.12.0

Juergen_R_R — Wed, 03 Jul 2024 14:02:39 GMT

I can confirm that this has indeed been fixed in oneAPI 24.2 with ifort 2021.13.0. However, there is a new or additional regression, which I have reported here:

New/additional regression