1 files changed, 138 insertions, 0 deletions
diff --git a/libs/soundtouch/cpu_detect_x86_gcc.cpp b/libs/soundtouch/cpu_detect_x86_gcc.cpp
new file mode 100644
index 0000000000..b4ccdc2834
--- /dev/null
+++ b/libs/soundtouch/cpu_detect_x86_gcc.cpp
@@ -0,0 +1,138 @@
+////////////////////////////////////////////////////////////////////////////////
+///
+/// gcc version of the x86 CPU detect routine.
+///
+/// This file is to be compiled on any platform with the GNU C compiler.
+/// Compiler. Please see 'cpu_detect_x86_win.cpp' for the x86 Windows version 
+/// of this file.
+///
+/// Author        : Copyright (c) Olli Parviainen
+/// Author e-mail : oparviai @ iki.fi
+/// SoundTouch WWW: http://www.iki.fi/oparviai/soundtouch
+///
+////////////////////////////////////////////////////////////////////////////////
+//
+// Last changed  : $Date$
+// File revision : $Revision$
+//
+// $Id$
+//
+////////////////////////////////////////////////////////////////////////////////
+//
+// License :
+//
+//  SoundTouch audio processing library
+//  Copyright (c) Olli Parviainen
+//
+//  This library is free software; you can redistribute it and/or
+//  modify it under the terms of the GNU Lesser General Public
+//  License as published by the Free Software Foundation; either
+//  version 2.1 of the License, or (at your option) any later version.
+//
+//  This library 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
+//  Lesser General Public License for more details.
+//
+//  You should have received a copy of the GNU Lesser General Public
+//  License along with this library; if not, write to the Free Software
+//  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
+//
+////////////////////////////////////////////////////////////////////////////////
+
+#include <stdexcept>
+#include <string>
+#include "cpu_detect.h"
+
+#ifndef __GNUC__
+#error wrong platform - this source code file is for the GNU C compiler.
+#endif
+
+using namespace std;
+
+#include <stdio.h>
+//////////////////////////////////////////////////////////////////////////////
+//
+// processor instructions extension detection routines
+//
+//////////////////////////////////////////////////////////////////////////////
+
+
+// Flag variable indicating whick ISA extensions are disabled (for debugging)
+static uint _dwDisabledISA = 0x00;      // 0xffffffff; //<- use this to disable all extensions
+
+// Disables given set of instruction extensions. See SUPPORT_... defines.
+void disableExtensions(uint dwDisableMask)
+{
+    _dwDisabledISA = dwDisableMask;
+}
+
+
+
+/// Checks which instruction set extensions are supported by the CPU.
+uint detectCPUextensions(void)
+{
+#ifndef __i386__
+    return 0; // always disable extensions on non-x86 platforms.
+#else
+    uint res = 0;
+
+    if (_dwDisabledISA == 0xffffffff) return 0;
+
+    asm volatile(
+        "\n\txor     %%esi, %%esi"       // clear %%esi = result register
+        // check if 'cpuid' instructions is available by toggling eflags bit 21
+
+        "\n\tpushf"                      // save eflags to stack
+        "\n\tpop     %%eax"              // load eax from stack (with eflags)
+        "\n\tmovl    %%eax, %%ecx"       // save the original eflags values to ecx
+        "\n\txor     $0x00200000, %%eax" // toggle bit 21
+        "\n\tpush    %%eax"              // store toggled eflags to stack
+        "\n\tpopf"                       // load eflags from stack
+        "\n\tpushf"                      // save updated eflags to stack
+        "\n\tpop     %%eax"              // load from stack
+        "\n\txor     %%edx, %%edx"       // clear edx for defaulting no mmx
+        "\n\tcmp     %%ecx, %%eax"       // compare to original eflags values
+        "\n\tjz      end"                // jumps to 'end' if cpuid not present
+
+        // cpuid instruction available, test for presence of mmx instructions
+
+        "\n\tmovl    $1, %%eax"
+        "\n\tcpuid"
+//        movl       $0x00800000, %edx   // force enable MMX
+        "\n\ttest    $0x00800000, %%edx"
+        "\n\tjz      end"                // branch if MMX not available
+
+        "\n\tor      $0x01, %%esi"       // otherwise add MMX support bit
+
+        "\n\ttest    $0x02000000, %%edx"
+        "\n\tjz      test3DNow"          // branch if SSE not available
+
+        "\n\tor      $0x08, %%esi"       // otherwise add SSE support bit
+
+    "\n\ttest3DNow:"
+        // test for precense of AMD extensions
+        "\n\tmov     $0x80000000, %%eax"
+        "\n\tcpuid"
+        "\n\tcmp     $0x80000000, %%eax"
+        "\n\tjbe     end"                 // branch if no AMD extensions detected
+
+        // test for precense of 3DNow! extension
+        "\n\tmov     $0x80000001, %%eax"
+        "\n\tcpuid"
+        "\n\ttest    $0x80000000, %%edx"
+        "\n\tjz      end"                  // branch if 3DNow! not detected
+
+        "\n\tor      $0x02, %%esi"         // otherwise add 3DNow support bit
+
+    "\n\tend:"
+
+        "\n\tmov     %%esi, %0"
+
+      : "=r" (res)
+      : /* no inputs */
+      : "%edx", "%eax", "%ecx", "%esi" );
+      
+    return res & ~_dwDisabledISA;
+#endif
+}