Power support for --with-cpu-32 etc.

["Joseph S. Myers" <joseph at codesourcery dot com>]

This patch adds support for the --with-cpu-32, --with-cpu-64,
--with-tune-32 and --with-tune-64 configure options on Power
architecture targets.  One use case present on Power but not on x86
where these options were originally added is to configure
--with-cpu=default32 --with-cpu-32=something --with-cpu-64=something
(with possibly the same argument to --with-cpu-32 and --with-cpu-64),
so allowing both a default CPU and a default choice of whether 32-bit
or 64-bit to be specified.

Bootstrapped with no regressions on powerpc64-unknown-linux-gnu.  OK
to commit?

2009-04-14  Joseph Myers  <joseph@codesourcery.com>

	* config.gcc (powerpc*-*-* | rs6000-*-*): Add
	rs6000/option-defaults.h to tm_file.  Support cpu_32, cpu_64,
	tune_32 and tune_64.
	* doc/install.texi (--with-cpu-32, --with-cpu-64): Document
	support on PowerPC.
	* config/rs6000/rs6000.h (OPTION_DEFAULT_SPECS): Move to ...
	* config/rs6000/option-defaults.h: ... here.  New file.
	(OPT_64, OPT_32): Define.
	(MASK_64BIT): Define to 0 if not already defined.
	(OPT_ARCH64, OPT_ARCH32): Define.
	(OPTION_DEFAULT_SPECS): Add entries for cpu_32, cpu_64, tune_32
	and tune_64.

Index: gcc/doc/install.texi
===================================================================
--- gcc/doc/install.texi	(revision 146031)
+++ gcc/doc/install.texi	(working copy)
@@ -1060,8 +1060,8 @@
 This option is only supported on some targets, including ARM, i386, M68k,
 PowerPC, and SPARC@.  The @option{--with-cpu-32} and
 @option{--with-cpu-64} options specify separate default CPUs for
-32-bit and 64-bit modes; these options are only supported for i386 and
-x86-64.
+32-bit and 64-bit modes; these options are only supported for i386,
+x86-64 and PowerPC.
 
 @item --with-schedule=@var{cpu}
 @itemx --with-arch=@var{cpu}
Index: gcc/config.gcc
===================================================================
--- gcc/config.gcc	(revision 146031)
+++ gcc/config.gcc	(working copy)
@@ -2416,6 +2416,8 @@
 i[34567]86-*-* | x86_64-*-*)
 	tmake_file="${tmake_file} i386/t-gmm_malloc i386/t-i386"
 	;;
+powerpc*-*-* | rs6000-*-*)
+	tm_file="${tm_file} rs6000/option-defaults.h"
 esac
 
 # Support for --with-cpu and related options (and a few unrelated options,
@@ -2878,12 +2880,20 @@
 		;;
 
 	powerpc*-*-* | rs6000-*-*)
-		supported_defaults="cpu float tune"
+		supported_defaults="cpu cpu_32 cpu_64 float tune tune_32 tune_64"
 
-		for which in cpu tune; do
+		for which in cpu cpu_32 cpu_64 tune tune_32 tune_64; do
 			eval "val=\$with_$which"
 			case ${val} in
 			default32 | default64)
+				case $which in
+				cpu | tune)
+					;;
+				*)
+					echo "$val only valid for --with-cpu and --with-tune." 1>&2
+					exit 1
+					;;
+				esac
 				with_which="with_$which"
 				eval $with_which=
 				;;
Index: gcc/config/rs6000/rs6000.h
===================================================================
--- gcc/config/rs6000/rs6000.h	(revision 146031)
+++ gcc/config/rs6000/rs6000.h	(working copy)
@@ -377,16 +377,6 @@
     previous_group
   };
 
-/* Support for a compile-time default CPU, et cetera.  The rules are:
-   --with-cpu is ignored if -mcpu is specified.
-   --with-tune is ignored if -mtune is specified.
-   --with-float is ignored if -mhard-float or -msoft-float are
-    specified.  */
-#define OPTION_DEFAULT_SPECS \
-  {"cpu", "%{!mcpu=*:-mcpu=%(VALUE)}" }, \
-  {"tune", "%{!mtune=*:-mtune=%(VALUE)}" }, \
-  {"float", "%{!msoft-float:%{!mhard-float:-m%(VALUE)-float}}" }
-
 /* rs6000_select[0] is reserved for the default cpu defined via --with-cpu */
 struct rs6000_cpu_select
 {
Index: gcc/config/rs6000/option-defaults.h
===================================================================
--- gcc/config/rs6000/option-defaults.h	(revision 0)
+++ gcc/config/rs6000/option-defaults.h	(revision 0)
@@ -0,0 +1,64 @@
+/* Definitions of default options for config/rs6000 configurations.
+   Copyright (C) 1992, 1993, 1994, 1995, 1996, 1997, 1998, 1999,
+   2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009
+   Free Software Foundation, Inc.
+
+   This file is part of GCC.
+
+   GCC is free software; you can redistribute it and/or modify it
+   under the terms of the GNU General Public License as published
+   by the Free Software Foundation; either version 3, or (at your
+   option) any later version.
+
+   GCC is distributed in the hope that it will be useful, but WITHOUT
+   ANY WARRANTY; without even the implied warranty of MERCHANTABILITY
+   or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public
+   License for more details.
+
+   Under Section 7 of GPL version 3, you are granted additional
+   permissions described in the GCC Runtime Library Exception, version
+   3.1, as published by the Free Software Foundation.
+
+   You should have received a copy of the GNU General Public License and
+   a copy of the GCC Runtime Library Exception along with this program;
+   see the files COPYING3 and COPYING.RUNTIME respectively.  If not, see
+   <http://www.gnu.org/licenses/>.  */
+
+/* This header needs to be included after any other headers affecting
+   TARGET_DEFAULT.  */
+
+#if TARGET_AIX
+#define OPT_64 "maix64"
+#define OPT_32 "maix32"
+#else
+#define OPT_64 "m64"
+#define OPT_32 "m32"
+#endif
+
+#ifndef MASK_64BIT
+#define MASK_64BIT 0
+#endif
+
+#if TARGET_DEFAULT & MASK_64BIT
+#define OPT_ARCH64 "!"OPT_32
+#define OPT_ARCH32 OPT_32
+#else
+#define OPT_ARCH64 OPT_64
+#define OPT_ARCH32 "!"OPT_64
+#endif
+
+/* Support for a compile-time default CPU, et cetera.  The rules are:
+   --with-cpu is ignored if -mcpu is specified; likewise --with-cpu-32
+     and --with-cpu-64.
+   --with-tune is ignored if -mtune is specified; likewise --with-tune-32
+     and --with-tune-64.
+   --with-float is ignored if -mhard-float or -msoft-float are
+    specified.  */
+#define OPTION_DEFAULT_SPECS \
+  {"cpu", "%{!mcpu=*:-mcpu=%(VALUE)}" }, \
+  {"cpu_32", "%{" OPT_ARCH32 ":%{!mcpu=*:-mcpu=%(VALUE)}}" }, \
+  {"cpu_64", "%{" OPT_ARCH64 ":%{!mcpu=*:-mcpu=%(VALUE)}}" }, \
+  {"tune", "%{!mtune=*:-mtune=%(VALUE)}" }, \
+  {"tune_32", "%{" OPT_ARCH32 ":%{!mtune=*:-mtune=%(VALUE)}}" }, \
+  {"tune_64", "%{" OPT_ARCH64 ":%{!mtune=*:-mtune=%(VALUE)}}" }, \
+  {"float", "%{!msoft-float:%{!mhard-float:-m%(VALUE)-float}}" }

-- 
Joseph S. Myers
joseph@codesourcery.com