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2010-11-28 Paul Thomas <pault@gcc.gnu.org> PR fortran/35810 * trans-array.c (gfc_trans_array_constructor): If the loop->to is a VAR_DECL, assume this is dynamic. In this case, use the counter to obtain the value and set loop->to appropriately. (gfc_conv_ss_descriptor): Always save the offset of a variable in info.saved_offset. (gfc_conv_ss_startstride): Do not attempt bound checking of the lhs of an assignment, if allocatable and f2003 is allowed. (gfc_conv_loop_setup): If possible, do not use an allocatable lhs variable for the loopspec. (gfc_is_reallocatable_lhs): New function. (get_std_lbound): New function. (gfc_alloc_allocatable_for_assignment): New function. * gfortran.h : Add flag_realloc_lhs to the options structure. * lang.opt : Add option f(no-)realloc-lhs. * invoke.texi : Document option f(no-)realloc-lhs. * options.c (gfc_init_options, gfc_post_options, gfc_handle_option): Incorporate f(no-)realloc-lhs with default to frealloc_lhs for -std > f95. * trans-array.h : Add primitive for previous. * trans-expr.c (gfc_conv_string_length): Return if character length is a variable and the expression is NULL. (gfc_conv_procedure_call): If the call is of the kind x = f(...) and the lhs is allocatable and reallocation on assignment OK, call gfc_alloc_allocatable_for_assignment. Do not generate the function call unless direct by reference. (realloc_lhs_loop_for_fcn_call): New function. (realloc_lhs_bounds_for_intrinsic_call): New function. (gfc_trans_arrayfunc_assign): Reallocation assignments need a loopinfo and for the loop bounds to be set. With intrinsic functions, free the lhs data and let the library allocate the data array. Done by the new functions above. (gfc_trans_assignment_1): If the lhs is allocatable and reallocation on assignment is allowed, mark the lhs and use gfc_alloc_allocatable_for_assignment to make the reallocation. * trans.h : Add is_alloc_lhs bitfield to gfc_ss structure. 2010-11-28 Paul Thomas <pault@gcc.gnu.org PR fortran/35810 * gfortran.dg/realloc_on_assign_1.f03: New test. * gfortran.dg/realloc_on_assign_2.f03: New test. * gfortran.dg/transpose_2.f90: dg-option -fno-realloc-lhs. * gfortran.dg/unpack_bounds_1.f90: The same. * gfortran.dg/cshift_bounds_2.f90: The same. * gfortran.dg/matmul_bounds_2.f90: The same. * gfortran.dg/matmul_bounds_3.f90: The same. * gfortran.dg/matmul_bounds_4.f90: The same. * gfortran.dg/matmul_bounds_5.f90: The same. From-SVN: r167220
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