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2025-03-21 Paul Thomas <pault@gcc.gnu.org> gcc/fortran PR fortran/85836 * check.cc (get_ul_from_cst_cl): New function used in check_operation. (check_operation): New function used in check_reduce and check_co_reduce. (gfc_check_co_reduce): Use it. (gfc_check_reduce): New function. (gfc_check_rename): Add prototype for intrinsic with 6 arguments. * gfortran.h : Add isym id for reduce and prototype for f6. * intrinsic.cc (do_check): Add another argument expression and use it in the call to the six argument specific check. (add_sym_6): New function. (add_functions): Add the discription of the reduce intrinsic and add it to the intrinsic list. * intrinsic.h : Add prototypes for gfc_check_reduce and gfc_resolve_reduce. * iresolve.cc (generate_reduce_op_wrapper): Generate a wrapper subroutine for the 'operation' function to enable the library implementation to be type agnostic and use pointer arithmetic throughout. (gfc_resolve_reduce): New function. * trans-expr.cc (gfc_conv_procedure_call): Add flag for scalar reduce. Generate a return variable 'sr' for scalar reduce, pass its address to the library function and return it as the scalar result. * trans-intrinsic.cc (gfc_conv_intrinsic_function): Array valued reduce is called in same way as reshape. Fall through for call to the scalar version. gcc/testsuite/ PR fortran/85836 * gfortran.dg/reduce_1.f90: New test * gfortran.dg/reduce_2.f90: New test libgfortran/ PR libfortran/85836 * Makefile.am : Add reduce.c * Makefile.in : Regenerated * gfortran.map : Add _gfortran_reduce, _gfortran_reduce_scalar, _gfortran_reduce_c and _gfortran_reduce_scalar_c to the list. * intrinsics/reduce.c (reduce, reduce_scalar, reduce_c, reduce_scalar_c): New functions and prototypes