Nvfortran 23.11 internal compiler error

Accelerated Computing HPC Compilers nvc, nvc++ and nvfortran
1

nvfortran 23.11 cannot compile this source file:

https://raw.githubusercontent.com/west-code-development/West/master/Libraries/Forpy/forpy_mod.f90

$ nvfortran -fast -Mpreprocess -c forpy_mod.f90
NVFORTRAN-F-0000-Internal compiler error. ad_instr(): missing last instruction       0  (forpy_mod.f90: 3161)
NVFORTRAN/x86-64 Linux 23.11-0: compilation aborted

$ nvfortran -O2 -Mpreprocess -c forpy_mod.f90
NVFORTRAN-F-0000-Internal compiler error. ad_instr(): missing last instruction       0  (forpy_mod.f90: 3161)
NVFORTRAN/x86-64 Linux 23.11-0: compilation aborted

$ nvfortran -O1 -Mpreprocess -c forpy_mod.f90
# no error
2

Hi victor.wz.yu.1012,

Thanks for the report and the example code. I was able to reproduce the error here and have filed an issue report, TPR #34768.

It appears to be a new regression in 23.11 as the code seems to compile correctly in 23.9 and earlier compilers. Reducing the optimization level to “-O1” also seems to work around the error.

-Mat

3

Thank you, Mat.

Yes, this is a new problem that didn’t happen with 23.9 or earlier versions. Hopefully it can be fixed in the next release.

Thanks,
Victor

4

Hi Victor,

Engineering let me know they tracked down the issue and determined that it’s a problem with the inliner, so another work around is to add the flag “-Mnoinline”.

-Mat