invoke.texi (-fargument-alias, [...]): Remove.

2010-04-07  Richard Guenther  <rguenther@suse.de>

	* doc/invoke.texi (-fargument-alias, -fargument-noalias,
	-fargument-noalias-global, -fargument-noalias-anything): Remove.
	* common.opt: Likewise.
	* tree-ssa-structalias.c (intra_create_variable_infos): Adjust
	comment.
	* alias.c (base_alias_check): Remove flag_argument_noalias
	handling.
	(nonoverlapping_memrefs_p): Likewise.
	* emit-rtl.c (set_mem_attributes_minus_bitpos): Likewise.
	* opts.c (common_handle_option): Handle OPT_fargument_alias,
	OPT_fargument_noalias, OPT_fargument_noalias_anything and
	OPT_fargument_noalias_global for backward compatibility.

	fortran/
	* options.c (gfc_init_options): Do not set.

From-SVN: r158060

gcc/ChangeLog

 2010-04-07  Richard Guenther  <rguenther@suse.de>
 
+	* doc/invoke.texi (-fargument-alias, -fargument-noalias,
+	-fargument-noalias-global, -fargument-noalias-anything): Remove.
+	* common.opt: Likewise.
+	* tree-ssa-structalias.c (intra_create_variable_infos): Adjust
+	comment.
+	* alias.c (base_alias_check): Remove flag_argument_noalias
+	handling.
+	(nonoverlapping_memrefs_p): Likewise.
+	* emit-rtl.c (set_mem_attributes_minus_bitpos): Likewise.
+	* opts.c (common_handle_option): Handle OPT_fargument_alias,
+	OPT_fargument_noalias, OPT_fargument_noalias_anything and
+	OPT_fargument_noalias_global for backward compatibility.
+
+2010-04-07  Richard Guenther  <rguenther@suse.de>
+
 	PR tree-optimization/43270
 	* tree-vrp.c (check_array_ref): Fix flexible array member
 	detection.

gcc/alias.c

@@ -1691,14 +1691,7 @@ base_alias_check (rtx x, rtx y, enum machine_mode x_mode,
       || (GET_CODE (y_base) == ADDRESS && GET_MODE (y_base) == Pmode))
     return 0;
 
-  if (! flag_argument_noalias)
   return 1;
-
-  if (flag_argument_noalias > 1)
-    return 0;
-
-  /* Weak noalias assertion (arguments are distinct, but may match globals).  */
-  return ! (GET_MODE (x_base) == VOIDmode && GET_MODE (y_base) == VOIDmode);
 }
 
 /* Convert the address X into something we can use.  This is done by returning
@@ -2189,13 +2182,6 @@ nonoverlapping_memrefs_p (const_rtx x, const_rtx y)
 	exprx = t;
       }
     }
-  else if (INDIRECT_REF_P (exprx))
-    {
-      exprx = TREE_OPERAND (exprx, 0);
-      if (flag_argument_noalias < 2
-	  || TREE_CODE (exprx) != PARM_DECL)
-	return 0;
-    }
 
   moffsety = MEM_OFFSET (y);
   if (TREE_CODE (expry) == COMPONENT_REF)
@@ -2217,13 +2203,6 @@ nonoverlapping_memrefs_p (const_rtx x, const_rtx y)
 	expry = t;
       }
     }
-  else if (INDIRECT_REF_P (expry))
-    {
-      expry = TREE_OPERAND (expry, 0);
-      if (flag_argument_noalias < 2
-	  || TREE_CODE (expry) != PARM_DECL)
-	return 0;
-    }
 
   if (! DECL_P (exprx) || ! DECL_P (expry))
     return 0;

gcc/common.opt

@@ -307,29 +307,21 @@ Align the start of loops
 falign-loops=
 Common RejectNegative Joined UInteger
 
-; This flag is only tested if alias checking is enabled.
-; 0 if pointer arguments may alias each other.  True in C.
-; 1 if pointer arguments may not alias each other but may alias
-;   global variables.
-; 2 if pointer arguments may not alias each other and may not
-;   alias global variables.
-; 3 if pointer arguments may not alias anything.  True in Fortran.
-;   Set by the front end.
 fargument-alias
-Common Report Var(flag_argument_noalias,0) Optimization
-Specify that arguments may alias each other and globals
+Common
+Does nothing. Preserved for backward compatibility.
 
 fargument-noalias
-Common Report Var(flag_argument_noalias,1) VarExists Optimization
-Assume arguments may alias globals but not each other
+Common
+Does nothing. Preserved for backward compatibility.
 
 fargument-noalias-global
-Common Report Var(flag_argument_noalias,2) VarExists Optimization
-Assume arguments alias neither each other nor globals
+Common
+Does nothing. Preserved for backward compatibility.
 
 fargument-noalias-anything
-Common Report Var(flag_argument_noalias,3) VarExists Optimization
-Assume arguments alias no other storage
+Common
+Does nothing. Preserved for backward compatibility.
 
 fasynchronous-unwind-tables
 Common Report Var(flag_asynchronous_unwind_tables) Optimization

gcc/doc/invoke.texi

@@ -916,8 +916,7 @@ See S/390 and zSeries Options.
 -fshort-double  -fshort-wchar @gol
 -fverbose-asm  -fpack-struct[=@var{n}]  -fstack-check @gol
 -fstack-limit-register=@var{reg}  -fstack-limit-symbol=@var{sym} @gol
--fno-stack-limit  -fargument-alias  -fargument-noalias @gol
--fargument-noalias-global  -fargument-noalias-anything @gol
+-fno-stack-limit @gol
 -fleading-underscore  -ftls-model=@var{model} @gol
 -ftrapv  -fwrapv  -fbounds-check @gol
 -fvisibility}
@@ -17444,31 +17443,6 @@ and grows downwards, you can use the flags
 @option{-Wl,--defsym,__stack_limit=0x7ffe0000} to enforce a stack limit
 of 128KB@.  Note that this may only work with the GNU linker.
 
-@cindex aliasing of parameters
-@cindex parameters, aliased
-@item -fargument-alias
-@itemx -fargument-noalias
-@itemx -fargument-noalias-global
-@itemx -fargument-noalias-anything
-@opindex fargument-alias
-@opindex fargument-noalias
-@opindex fargument-noalias-global
-@opindex fargument-noalias-anything
-Specify the possible relationships among parameters and between
-parameters and global data.
-
-@option{-fargument-alias} specifies that arguments (parameters) may
-alias each other and may alias global storage.@*
-@option{-fargument-noalias} specifies that arguments do not alias
-each other, but may alias global storage.@*
-@option{-fargument-noalias-global} specifies that arguments do not
-alias each other and do not alias global storage.
-@option{-fargument-noalias-anything} specifies that arguments do not
-alias any other storage.
-
-Each language will automatically use whatever option is required by
-the language standard.  You should not need to use these options yourself.
-
 @item -fleading-underscore
 @opindex fleading-underscore
 This option and its counterpart, @option{-fno-leading-underscore}, forcibly

gcc/emit-rtl.c

@@ -1751,14 +1751,6 @@ set_mem_attributes_minus_bitpos (rtx ref, tree t, int objectp,
 		 the size we got from the type?  */
 	    }
 
-	  else if (flag_argument_noalias > 1
-		   && (INDIRECT_REF_P (t2))
-		   && TREE_CODE (TREE_OPERAND (t2, 0)) == PARM_DECL)
-	    {
-	      expr = t2;
-	      offset = NULL;
-	    }
-
 	  /* If this is an indirect reference, record it.  */
 	  else if (TREE_CODE (t) == INDIRECT_REF
 		   || TREE_CODE (t) == MISALIGNED_INDIRECT_REF)
@@ -1769,16 +1761,6 @@ set_mem_attributes_minus_bitpos (rtx ref, tree t, int objectp,
 	    }
 	}
 
-      /* If this is a Fortran indirect argument reference, record the
-	 parameter decl.  */
-      else if (flag_argument_noalias > 1
-	       && (INDIRECT_REF_P (t))
-	       && TREE_CODE (TREE_OPERAND (t, 0)) == PARM_DECL)
-	{
-	  expr = t;
-	  offset = NULL;
-	}
-
       /* If this is an indirect reference, record it.  */
       else if (TREE_CODE (t) == INDIRECT_REF
 	       || TREE_CODE (t) == MISALIGNED_INDIRECT_REF)

gcc/fortran/ChangeLog

+2010-04-07  Richard Guenther  <rguenther@suse.de>
+
+	* options.c (gfc_init_options): Do not set.
+
 2010-04-06  Tobias Burnus  <burnus@net-b.de>
 
 	PR fortran/18918

gcc/fortran/options.c

@@ -132,9 +132,6 @@ gfc_init_options (unsigned int argc, const char **argv)
   gfc_option.rtcheck = 0;
   gfc_option.coarray = GFC_FCOARRAY_NONE;
 
-  /* Argument pointers cannot point to anything but their argument.  */
-  flag_argument_noalias = 3;
-
   flag_errno_math = 0;
 
   set_default_std_flags ();

gcc/opts.c

@@ -2127,6 +2127,10 @@ common_handle_option (size_t scode, const char *arg, int value,
     case OPT_ftree_salias:
     case OPT_ftree_store_ccp:
     case OPT_Wunreachable_code:
+    case OPT_fargument_alias:
+    case OPT_fargument_noalias:
+    case OPT_fargument_noalias_anything:
+    case OPT_fargument_noalias_global:
       /* These are no-ops, preserved for backward compatibility.  */
       break;
 

gcc/tree-ssa-structalias.c

@@ -4611,7 +4611,8 @@ intra_create_variable_infos (void)
   tree t;
 
   /* For each incoming pointer argument arg, create the constraint ARG
-     = NONLOCAL or a dummy variable if flag_argument_noalias is set.  */
+     = NONLOCAL or a dummy variable if it is a restrict qualified
+     passed-by-reference argument.  */
   for (t = DECL_ARGUMENTS (current_function_decl); t; t = TREE_CHAIN (t))
     {
       varinfo_t p;