re PR fortran/48448 (Implement -f(no-)frontend-optimization)
2011-04-08 Thomas Koenig <tkoenig@gcc.gnu.org> PR fortran/48448 * gfortran.h (gfc_option_t): Add warn_function_elimination and flag_frontend_optimize. * lang.opt (Wfunction-elimination): Add. (ffrontend-optimize): Add. * invoke.texi: Add documentation for -Wfunction-elimination and -ffrontend-optimize. Add -faggressive-function-elimination to list of code generation options. * frontend-passes.c (gfc_run_passes): Run optimizations if flag_frontend_optimize is set. (warn_function_elimination): New function. (cfe_expr_0): Call it if requested to do so. * options.c (gfc_init_options): Initiate warn_function_elimination and flag_frontend_optimize. (gfc_post_options): Set flag_frontend_optimize if not specified by user, depending on the optimization level. (gfc_handle_option): Handle -Wfunction-elimination and -ffrontend-optimize. 2011-04-08 Thomas Koenig <tkoenig@gcc.gnu.org> PR fortran/48448 * gfortran.dg/function_optimize_5.f90: New test. From-SVN: r172215
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Thomas Koenig
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@ -1,3 +1,24 @@
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2011-04-08 Thomas Koenig <tkoenig@gcc.gnu.org>
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PR fortran/48448
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* gfortran.h (gfc_option_t): Add warn_function_elimination and
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flag_frontend_optimize.
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* lang.opt (Wfunction-elimination): Add.
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(ffrontend-optimize): Add.
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* invoke.texi: Add documentation for -Wfunction-elimination
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and -ffrontend-optimize. Add -faggressive-function-elimination
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to list of code generation options.
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* frontend-passes.c (gfc_run_passes): Run optimizations if
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flag_frontend_optimize is set.
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(warn_function_elimination): New function.
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(cfe_expr_0): Call it if requested to do so.
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* options.c (gfc_init_options): Initiate warn_function_elimination
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and flag_frontend_optimize.
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(gfc_post_options): Set flag_frontend_optimize if not specified
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by user, depending on the optimization level.
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(gfc_handle_option): Handle -Wfunction-elimination and
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-ffrontend-optimize.
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2011-04-06 Tobias Burnus <burnus@net-b.de>
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PR fortran/18918
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@ -62,7 +62,7 @@ gfc_namespace *current_ns;
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void
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gfc_run_passes (gfc_namespace *ns)
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{
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if (optimize)
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if (gfc_option.flag_frontend_optimize)
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{
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expr_size = 20;
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expr_array = XNEWVEC(gfc_expr **, expr_size);
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@ -283,6 +283,20 @@ create_var (gfc_expr * e)
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return result;
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}
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/* Warn about function elimination. */
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static void
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warn_function_elimination (gfc_expr *e)
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{
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if (e->expr_type != EXPR_FUNCTION)
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return;
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if (e->value.function.esym)
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gfc_warning ("Removing call to function '%s' at %L",
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e->value.function.esym->name, &(e->where));
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else if (e->value.function.isym)
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gfc_warning ("Removing call to function '%s' at %L",
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e->value.function.isym->name, &(e->where));
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}
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/* Callback function for the code walker for doing common function
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elimination. This builds up the list of functions in the expression
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and goes through them to detect duplicates, which it then replaces
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@ -315,6 +329,10 @@ cfe_expr_0 (gfc_expr **e, int *walk_subtrees,
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{
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if (newvar == NULL)
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newvar = create_var (*(expr_array[i]));
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if (gfc_option.warn_function_elimination)
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warn_function_elimination (*(expr_array[j]));
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gfc_free (*(expr_array[j]));
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*(expr_array[j]) = gfc_copy_expr (newvar);
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}
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@ -2180,6 +2180,7 @@ typedef struct
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int warn_ampersand;
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int gfc_warn_conversion;
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int warn_conversion_extra;
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int warn_function_elimination;
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int warn_implicit_interface;
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int warn_implicit_procedure;
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int warn_line_truncation;
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@ -2234,6 +2235,7 @@ typedef struct
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int flag_protect_parens;
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int flag_realloc_lhs;
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int flag_aggressive_function_elimination;
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int flag_frontend_optimize;
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int fpe;
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int rtcheck;
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@ -139,7 +139,7 @@ and warnings}.
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-Wall -Waliasing -Wampersand -Warray-bounds -Wcharacter-truncation @gol
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-Wconversion -Wimplicit-interface -Wimplicit-procedure -Wline-truncation @gol
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-Wintrinsics-std -Wsurprising -Wno-tabs -Wunderflow -Wunused-parameter @gol
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-Wintrinsic-shadow -Wno-align-commons}
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-Wintrinsic-shadow -Wno-align-commons -Wfunction-elimination}
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@item Debugging Options
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@xref{Debugging Options,,Options for debugging your program or GNU Fortran}.
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@ -171,7 +171,8 @@ and warnings}.
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-fblas-matmul-limit=@var{n} -frecursive -finit-local-zero @gol
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-finit-integer=@var{n} -finit-real=@var{<zero|inf|-inf|nan|snan>} @gol
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-finit-logical=@var{<true|false>} -finit-character=@var{n} @gol
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-fno-align-commons -fno-protect-parens -frealloc-lhs}
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-fno-align-commons -fno-protect-parens -frealloc-lhs @gol
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-faggressive-function-elimination -ffrontend-optimize}
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@end table
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@menu
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@ -859,6 +860,14 @@ By default, @command{gfortran} warns about any occasion of variables being
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padded for proper alignment inside a @code{COMMON} block. This warning can be turned
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off via @option{-Wno-align-commons}. See also @option{-falign-commons}.
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@item -Wfunction-elimination
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@opindex @code{Wfunction-elimination}
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@cindex function elimination
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@cindex warnings, function elimination
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Warn if any calls to functions are eliminated by the optimizations
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enabled by the @option{-ffrontend-optimize} option.
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@item -Werror
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@opindex @code{Werror}
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@cindex warnings, to errors
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@ -1482,8 +1491,19 @@ statements, regardless of whether these functions are marked
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@smallexample
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a = f(b,c) + f(b,c)
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@end smallexample
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there will only be a single call to @code{f}.
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there will only be a single call to @code{f}. This option only works
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if @option{-ffrontend-optimize} is in effect.
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@item -ffrontend-optimize
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@opindex @code{frontend-optimize}
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@cindex Front-end optimization
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This option performs front-end optimization, based on manipulating
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parts the Fortran parse tree. Enabled by default by any @option{-O}
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option. Optimizations enabled by this option include elimination of
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identical function calls within expressions, removing unnecessary
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calls to @code{TRIM} in comparisons and assignments and replacing
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@code{TRIM(a)} with @code{a(1:LEN_TRIM(a))}.
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It can be deselected by specifying @option{-fno-frontend-optimize}.
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@end table
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@xref{Code Gen Options,,Options for Code Generation Conventions,
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@ -222,6 +222,10 @@ Wconversion-extra
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Fortran Warning
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Warn about most implicit conversions
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Wfunction-elimination
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Fortran Warning
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Warn about function call elimination
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Wimplicit-interface
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Fortran Warning
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Warn about calls with implicit interface
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@ -414,6 +418,10 @@ ffree-line-length-
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Fortran RejectNegative Joined UInteger
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-ffree-line-length-<n> Use n as character line width in free mode
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ffrontend-optimize
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Fortran
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Enable front end optimization
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fimplicit-none
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Fortran
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Specify that no implicit typing is allowed, unless overridden by explicit IMPLICIT statements
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@ -99,6 +99,7 @@ gfc_init_options (unsigned int decoded_options_count,
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gfc_option.warn_array_temp = 0;
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gfc_option.gfc_warn_conversion = 0;
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gfc_option.warn_conversion_extra = 0;
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gfc_option.warn_function_elimination = 0;
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gfc_option.warn_implicit_interface = 0;
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gfc_option.warn_line_truncation = 0;
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gfc_option.warn_surprising = 0;
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@ -151,6 +152,7 @@ gfc_init_options (unsigned int decoded_options_count,
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gfc_option.flag_protect_parens = 1;
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gfc_option.flag_realloc_lhs = -1;
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gfc_option.flag_aggressive_function_elimination = 0;
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gfc_option.flag_frontend_optimize = -1;
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gfc_option.fpe = 0;
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gfc_option.rtcheck = 0;
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@ -418,6 +420,12 @@ gfc_post_options (const char **pfilename)
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if (pedantic && gfc_option.flag_whole_file)
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gfc_option.flag_whole_file = 2;
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/* Optimization implies front end optimization, unless the user
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specified it directly. */
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if (gfc_option.flag_frontend_optimize == -1)
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gfc_option.flag_frontend_optimize = optimize;
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gfc_cpp_post_options ();
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/* FIXME: return gfc_cpp_preprocess_only ();
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@ -610,6 +618,10 @@ gfc_handle_option (size_t scode, const char *arg, int value,
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gfc_option.warn_conversion_extra = value;
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break;
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case OPT_Wfunction_elimination:
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gfc_option.warn_function_elimination = value;
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break;
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case OPT_Wimplicit_interface:
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gfc_option.warn_implicit_interface = value;
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break;
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@ -979,6 +991,10 @@ gfc_handle_option (size_t scode, const char *arg, int value,
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gfc_option.flag_aggressive_function_elimination = value;
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break;
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case OPT_ffrontend_optimize:
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gfc_option.flag_frontend_optimize = value;
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break;
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case OPT_fprotect_parens:
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gfc_option.flag_protect_parens = value;
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break;
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@ -1,3 +1,8 @@
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2011-04-08 Thomas Koenig <tkoenig@gcc.gnu.org>
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PR fortran/48448
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* gfortran.dg/function_optimize_5.f90: New test.
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2011-04-08 Eric Botcazou <ebotcazou@adacore.com>
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* gnat.dg/aggr17.adb: New test.
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@ -0,0 +1,41 @@
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! { dg-do compile }
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! { dg-options "-ffrontend-optimize -Wfunction-elimination" }
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! Check the -ffrontend-optimize (in the absence of -O) and
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! -Wfunction-elimination options.
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program main
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implicit none
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real, dimension(2,2) :: a, b, c, d
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integer :: i
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real :: x, z
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character(60) :: line
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real, external :: ext_func
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interface
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elemental function element(x)
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real, intent(in) :: x
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real :: elem
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end function element
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pure function mypure(x)
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real, intent(in) :: x
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integer :: mypure
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end function mypure
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elemental impure function elem_impure(x)
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real, intent(in) :: x
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real :: elem_impure
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end function elem_impure
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end interface
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data a /2., 3., 5., 7./
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data b /11., 13., 17., 23./
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write (unit=line, fmt='(4F7.2)') matmul(a,b) & ! { dg-warning "Removing call to function 'matmul'" }
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& + matmul(a,b)
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z = sin(x) + 2.0 + sin(x) ! { dg-warning "Removing call to function 'sin'" }
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print *,z
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x = ext_func(a) + 23 + ext_func(a)
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print *,d,x
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z = element(x) + element(x) ! { dg-warning "Removing call to function 'element'" }
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print *,z
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i = mypure(x) - mypure(x) ! { dg-warning "Removing call to function 'mypure'" }
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print *,i
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z = elem_impure(x) - elem_impure(x)
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print *,z
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end program main
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