re PR fortran/48864 (-Ofast should imply -fno-protect-parens)

gcc/
2011-05-04  Tobias Burnus  <burnus@net-b.de>

        PR fortran/48864
        * doc/invoke.texi (Ofast): Document that it
        enables Fortran's -fno-protect-parens.

gcc/fortran
2011-05-04  Tobias Burnus  <burnus@net-b.de>

        PR fortran/48864
        * invoke.texi (fno-protect-parens): Document
        that -Ofast implies -fno-protect-parens.
        * options.c (gfc_init_options, gfc_post_options):
        Make -Ofast imply -fno-protect-parens.

From-SVN: r173385

gcc/ChangeLog

+2011-05-04  Tobias Burnus  <burnus@net-b.de>
+
+	PR fortran/48864
+	* doc/invoke.texi (Ofast): Document that it
+	enables Fortran's -fno-protect-parens.
+
 2011-05-04  Uros Bizjak  <ubizjak@gmail.com>
 
 	* config/i386/i386.c (ix86_reorg): Run move_or_delete_vzeroupper first.

gcc/doc/invoke.texi

@@ -5999,7 +5999,8 @@ optimizations designed to reduce code size.
 Disregard strict standards compliance.  @option{-Ofast} enables all
 @option{-O3} optimizations.  It also enables optimizations that are not
 valid for all standard compliant programs.
-It turns on @option{-ffast-math}.
+It turns on @option{-ffast-math} and the Fortran-specific
+@option{-fno-protect-parens}.
 
 If you use multiple @option{-O} options, with or without level numbers,
 the last such option is the one that is effective.

gcc/fortran/ChangeLog

+2011-05-04  Tobias Burnus  <burnus@net-b.de>
+
+	PR fortran/48864
+	* invoke.texi (fno-protect-parens): Document
+	that -Ofast implies -fno-protect-parens.
+	* options.c (gfc_init_options, gfc_post_options):
+	Make -Ofast imply -fno-protect-parens.
+
 2011-05-04  Nathan Froyd  <froydnj@codesourcery.com>
 
 	* trans-decl.c (build_library_function_decl_1): Call

gcc/fortran/invoke.texi

@@ -1488,7 +1488,8 @@ levels such that the compiler does not do any re-association. Using
 @option{-fno-protect-parens} allows the compiler to reorder @code{REAL} and
 @code{COMPLEX} expressions to produce faster code. Note that for the re-association
 optimization @option{-fno-signed-zeros} and @option{-fno-trapping-math}
-need to be in effect.
+need to be in effect. The parentheses protection is enabled by default, unless
+@option{-Ofast} is given.
 
 @item -frealloc-lhs
 @opindex @code{frealloc-lhs}

gcc/fortran/options.c

@@ -151,7 +151,7 @@ gfc_init_options (unsigned int decoded_options_count,
   gfc_option.flag_init_character = GFC_INIT_CHARACTER_OFF;
   gfc_option.flag_init_character_value = (char)0;
   gfc_option.flag_align_commons = 1;
-  gfc_option.flag_protect_parens = 1;
+  gfc_option.flag_protect_parens = -1;
   gfc_option.flag_realloc_lhs = -1;
   gfc_option.flag_aggressive_function_elimination = 0;
   gfc_option.flag_frontend_optimize = -1;
@@ -272,6 +272,9 @@ gfc_post_options (const char **pfilename)
   if (flag_associative_math == -1)
     flag_associative_math = (!flag_trapping_math && !flag_signed_zeros);
 
+  if (gfc_option.flag_protect_parens == -1)
+    gfc_option.flag_protect_parens = !optimize_fast;
+
   /* By default, disable (re)allocation during assignment for -std=f95,
      and enable it for F2003/F2008/GNU/Legacy. */
   if (gfc_option.flag_realloc_lhs == -1)