Internal Compiler Error: Fortran2008 norm2

Questions on using the PGI Compilers and Tools
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awvwgk
Posts: 4
Joined: May 11 2020

Internal Compiler Error: Fortran2008 norm2

Post by awvwgk » Tue May 19, 2020 8:10 am

Something is really odd about the norm2 intrinsic function for Fortran 2008, the pgfortran compiler fails with ICE even for simple expressions.

Operating system is a Manjaro Linux
Compiler used

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pgfortran -V

pgfortran 19.10-0 LLVM 64-bit target on x86-64 Linux -tp sandybridge 
PGI Compilers and Tools
Copyright (c) 2019, NVIDIA CORPORATION.  All rights reserved.
A minimal working example is provided with

Code: Select all

program mwe
   integer, parameter :: wp = selected_real_kind(15)
   real(wp), allocatable :: xyz(:, :)
   real(wp) :: dist
   integer :: i, j
   xyz = reshape([&
      &  2.02799738646442_wp,  0.09231312124713_wp, -0.14310895950963_wp, &
      &  4.75011007621000_wp,  0.02373496014051_wp, -0.14324124033844_wp, &
      &  6.33434307654413_wp,  2.07098865582721_wp, -0.14235306905930_wp, &
      &  8.72860718071825_wp,  1.38002919517619_wp, -0.14265542523943_wp, &
      &  8.65318821103610_wp, -1.19324866489847_wp, -0.14231527453678_wp, &
      &  6.23857175648671_wp, -2.08353643730276_wp, -0.14218299370797_wp, &
      &  5.63266886875962_wp, -4.69950321056008_wp, -0.13940509630299_wp, &
      &  3.44931709749015_wp, -5.48092386085491_wp, -0.14318454855466_wp, &
      &  7.77508917214346_wp, -6.24427872938674_wp, -0.13107140408805_wp, &
      & 10.30229550927022_wp, -5.39739796609292_wp, -0.13672168520430_wp, &
      & 12.07410272485492_wp, -6.91573621641911_wp, -0.13666499342053_wp, &
      & 10.70038521493902_wp, -2.79078533715849_wp, -0.14148379504141_wp, &
      & 13.24597858727017_wp, -1.76969072232377_wp, -0.14218299370797_wp, &
      &  7.40891694074004_wp, -8.95905928176407_wp, -0.11636933482904_wp, &
      &  1.38702118184179_wp,  2.05575746325296_wp, -0.14178615122154_wp, &
      &  1.34622199478497_wp, -0.86356704498496_wp,  1.55590600570783_wp, &
      &  1.34624089204623_wp, -0.86133716815647_wp, -1.84340893849267_wp, &
      &  5.65596919189118_wp,  4.00172183859480_wp, -0.14131371969009_wp, &
      & 14.67430918222276_wp, -3.26230980007732_wp, -0.14344911021228_wp, &
      & 13.50897177220290_wp, -0.60815166181684_wp,  1.54898960808727_wp, &
      & 13.50780014200488_wp, -0.60614855212345_wp, -1.83214617078268_wp, &
      &  5.41408424778406_wp, -9.49239668625902_wp, -0.11022772492007_wp, &
      &  8.31919801555568_wp, -9.74947502841788_wp,  1.56539243085954_wp, &
      &  8.31511620712388_wp, -9.76854236502758_wp, -1.79108242206824_wp],&
      &  [3, 24])

   do i = 1, size(xyz, 2)
      do j = 1, i-1
         dist = norm2(xyz(:, i)-xyz(:, j))
      end do
   end do

end program mwe
Invoking the PGI compiler results in

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PGF90-S-0000-Internal compiler error. transform_call:Array Expression can't be here     168  (bug3.f90: 35)
Lowering Error: bad ast optype in expression [ast=163,asttype=12,datatype=0]
PGF90-F-0000-Internal compiler error. Errors in Lowering       1  (bug3.f90: 39)
PGF90/x86-64 Linux 19.10-0: compilation aborted
Expected result is either an error message for missing Fortran 2008 support or compiling the program.

A workaround is to have a temporary variable to store the vector in and than invoke norm2.

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vec(:) = xyz(:, i)-xyz(:, j)
dist = norm2(vec)

mkcolg
Posts: 8382
Joined: Jun 30 2004

Re: Internal Compiler Error: Fortran2008 norm2

Post by mkcolg » Tue May 19, 2020 8:22 am

Hi Awvwgk,

It's a know issue that was fixed in the 20.1 release.

Code: Select all

% pgfortran norm.f90 -V19.10
PGF90-S-0000-Internal compiler error. transform_call:Array Expression can't be here     168  (norm.f90: 35)
Lowering Error: bad ast optype in expression [ast=163,asttype=12,datatype=0]
PGF90-F-0000-Internal compiler error. Errors in Lowering       1  (norm.f90: 39)
PGF90/x86-64 Linux 19.10-0: compilation aborted
% pgfortran norm.f90 -V20.1
%
-Mat

awvwgk
Posts: 4
Joined: May 11 2020

Re: Internal Compiler Error: Fortran2008 norm2

Post by awvwgk » Tue May 19, 2020 8:51 am

Thanks for letting me know, so I will stick with the workaround until the community version is updated.

- Sebastian

mkcolg
Posts: 8382
Joined: Jun 30 2004

Re: Internal Compiler Error: Fortran2008 norm2

Post by mkcolg » Tue May 19, 2020 9:12 am

Hi Sebastian,

FYI, PGI 19.10 was the last PGI branded Community Edition and PGI 20.4 was the last PGI release. PGI is being re-branded as the NVIDIA HPC SDK Compiler. The early access of the NVHPC 20.5 will be available soon at no cost, but does require registration. See: https://developer.nvidia.com/hpc-sdk

-Mat

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