mips: Autodetect MIPS DSP rev1 and rev2 instructionset

Not every MIPS SoC has the DSP extensions, auto-detect them by using
builtin GCC functions. Check for the DSP macros and add the result
for rev1 and rev2 to the cpufeatures.

Change-Id: I3d6c950f170f102514c43b349f9a23ee796d801a
Reviewed-by: Girish Ramakrishnan <girish.1.ramakrishnan@nokia.com>
Reviewed-by: Thiago Macieira <thiago.macieira@intel.com>

config.tests/arch/arch.cpp

@@ -229,7 +229,12 @@ const char msg2[] = "==Qt=magic=Qt== Sub-architecture:"
 #endif
 
 // -- MIPS --
-// Wikipedia says there are extensions, but GCC installs no headers
+# if __mips_dsp
+" dsp"
+# endif
+# if __mips_dspr2
+" dspr2"
+# endif
 
 // -- POWER, PowerPC --
 #ifdef __ALTIVEC__

config.tests/unix/mips_dsp/mips_dsp.cpp

@@ -0,0 +1,47 @@
+/****************************************************************************
+**
+** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/
+**
+** This file is part of the config.tests of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** This file may be used under the terms of the GNU Lesser General Public
+** License version 2.1 as published by the Free Software Foundation and
+** appearing in the file LICENSE.LGPL included in the packaging of this
+** file. Please review the following information to ensure the GNU Lesser
+** General Public License version 2.1 requirements will be met:
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights. These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU General
+** Public License version 3.0 as published by the Free Software Foundation
+** and appearing in the file LICENSE.GPL included in the packaging of this
+** file. Please review the following information to ensure the GNU General
+** Public License version 3.0 requirements will be met:
+** http://www.gnu.org/copyleft/gpl.html.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+int main(int, char**)
+{
+    int result;
+    __builtin_mips_lhx(&result, 10);
+    return result;
+}

config.tests/unix/mips_dsp/mips_dsp.pro

@@ -0,0 +1,2 @@
+SOURCES = mips_dsp.cpp
+CONFIG -= x11 qt

config.tests/unix/mips_dspr2/mips_dspr2.cpp

@@ -0,0 +1,49 @@
+/****************************************************************************
+**
+** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
+** Contact: http://www.qt-project.org/
+**
+** This file is part of the config.tests of the Qt Toolkit.
+**
+** $QT_BEGIN_LICENSE:LGPL$
+** GNU Lesser General Public License Usage
+** This file may be used under the terms of the GNU Lesser General Public
+** License version 2.1 as published by the Free Software Foundation and
+** appearing in the file LICENSE.LGPL included in the packaging of this
+** file. Please review the following information to ensure the GNU Lesser
+** General Public License version 2.1 requirements will be met:
+** http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
+**
+** In addition, as a special exception, Nokia gives you certain additional
+** rights. These rights are described in the Nokia Qt LGPL Exception
+** version 1.1, included in the file LGPL_EXCEPTION.txt in this package.
+**
+** GNU General Public License Usage
+** Alternatively, this file may be used under the terms of the GNU General
+** Public License version 3.0 as published by the Free Software Foundation
+** and appearing in the file LICENSE.GPL included in the packaging of this
+** file. Please review the following information to ensure the GNU General
+** Public License version 3.0 requirements will be met:
+** http://www.gnu.org/copyleft/gpl.html.
+**
+** Other Usage
+** Alternatively, this file may be used in accordance with the terms and
+** conditions contained in a signed written agreement between you and Nokia.
+**
+**
+**
+**
+**
+**
+** $QT_END_LICENSE$
+**
+****************************************************************************/
+
+int main(int, char**)
+{
+    int result, tmp1, tmp2;
+    tmp1 = 10;
+    tmp2 = 20;
+    result = __builtin_mips_append (tmp1, tmp2, 10);
+    return result;
+}

config.tests/unix/mips_dspr2/mips_dspr2.pro

@@ -0,0 +1,2 @@
+SOURCES = mips_dspr2.cpp
+CONFIG -= x11 qt

configure

@@ -837,8 +837,8 @@ CFG_REDUCE_RELOCATIONS=auto
 CFG_ACCESSIBILITY=auto
 CFG_IWMMXT=no
 CFG_NEON=auto
-CFG_MIPS_DSP=yes
+CFG_MIPS_DSP=auto
-CFG_MIPS_DSPR2=yes
+CFG_MIPS_DSPR2=auto
 CFG_CLOCK_GETTIME=auto
 CFG_CLOCK_MONOTONIC=auto
 CFG_MREMAP=auto
@@ -3994,17 +3994,25 @@ elif [ "$CFG_ARCH" != "arm" ]; then
 fi
 
 # detect mips_dsp support
-if [ "${CFG_ARCH}" = "mips" ] && [ "${CFG_MIPS_DSP}" = "yes" ]; then
+if [ "$CFG_ARCH" = "mips" ] && [ "${CFG_MIPS_DSP}" = "auto" ]; then
-  CFG_MIPS_DSP=yes
+    if "$unixtests/compile.test" "$XQMAKESPEC" "$QMAKE_CONFIG" $OPT_VERBOSE "$relpath" "$outpath" config.tests/unix/mips_dsp "mips_dsp" $L_FLAGS $I_FLAGS $D_FLAGS $l_FLAGS; then
+        CFG_MIPS_DSP=yes
     else
-  CFG_MIPS_DSP=no
+        CFG_MIPS_DSP=no
+    fi
+elif [ "$CFG_ARCH" != "mips" ]; then
+    CFG_MIPS_DSP=no
 fi
 
 # detect mips_dspr2 support
-if [ "${CFG_ARCH}" = "mips" ] && [ "${CFG_MIPS_DSPR2}" = "yes" ]; then
+if [ "$CFG_ARCH" = "mips" ] && [ "${CFG_MIPS_DSPR2}" = "auto" ]; then
-  CFG_MIPS_DSPR2=yes
+    if "$unixtests/compile.test" "$XQMAKESPEC" "$QMAKE_CONFIG" $OPT_VERBOSE "$relpath" "$outpath" config.tests/unix/mips_dspr2 "mips_dspr2" $L_FLAGS $I_FLAGS $D_FLAGS $l_FLAGS; then
+        CFG_MIPS_DSPR2=yes
     else
-  CFG_MIPS_DSPR2=no
+        CFG_MIPS_DSPR2=no
+    fi
+elif [ "$CFG_ARCH" != "mips" ]; then
+    CFG_MIPS_DSPR2=no
 fi
 
 [ "$XPLATFORM_MINGW" = "yes" ] && QMakeVar add styles "windowsxp windowsvista"