https://gcc.gnu.org/bugzilla/show_bug.cgi?id=77915
Bug ID: 77915
Summary: Internal error for matmul() in forall with
optimization
Product: gcc
Version: 6.2.0
Status: UNCONFIRMED
Severity: normal
Priority: P3
Component: fortran
Assignee: unassigned at gcc dot gnu.org
Reporter: hroch at physics dot muni.cz
Target Milestone: ---
Dear colleagues,
I encountered an internal problem in gfortran
compiler for matmul() in forall loop, while
optimization is switched on.
There is a minimal code:
---
program x
integer, parameter :: d = 3
real,dimension(d,d,d) :: cube,xcube
real, dimension(d,d) :: cmatrix
integer :: i,j
forall(i=1:d,j=1:d)
xcube(i,j,:) = matmul(cmatrix,cube(i,j,:))
end forall
end program x
---
which works correctly for
$ gfortran f.f95
while with optimization flag
$ gfortran -O f.f95
fails on:
---
f.f95:6:0:
forall(i=1:d,j=1:d)
internal compiler error: in gfc_trans_forall_1, at fortran/trans-stmt.c:4388
0x6edc26 gfc_trans_forall_1
../../src/gcc/fortran/trans-stmt.c:4388
0x68dfd7 trans_code
../../src/gcc/fortran/trans.c:1832
0x6b167c gfc_generate_function_code(gfc_namespace*)
../../src/gcc/fortran/trans-decl.c:6167
0x649b90 translate_all_program_units
../../src/gcc/fortran/parse.c:5915
0x649b90 gfc_parse_file()
../../src/gcc/fortran/parse.c:6121
0x68b322 gfc_be_parse_file
../../src/gcc/fortran/f95-lang.c:201
Please submit a full bug report,
with preprocessed source if appropriate.
Please include the complete backtrace with any bug report.
See for instructions.
---
The compiler version is
$ gfortran --version
GNU Fortran (Debian 6.2.0-5) 6.2.0 20160927
Copyright (C) 2016 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOS
which is from latest GNU/Debian (unstable) compiler collection.
Older compilers (GNU Fortran (Debian 4.9.2-10) 4.9.2) works
correctly. Use of both '-O -finline-matmul-limit=0' is also
successful.
Thank you for developing of gfortran!
