3rdparty/SoundTouch/cpu_detect_x86_win.cpp

////////////////////////////////////////////////////////////////////////////////
///
/// Win32 version of the x86 CPU detect routine.
///
/// This file is to be compiled in Windows platform with Microsoft Visual C++
/// Compiler. Please see 'cpu_detect_x86_gcc.cpp' for the gcc compiler version
/// for all GNU platforms.
///
/// Author        : Copyright (c) Olli Parviainen
/// Author e-mail : oparviai 'at' iki.fi
/// SoundTouch WWW: http://www.surina.net/soundtouch
///
////////////////////////////////////////////////////////////////////////////////
//
// Last changed  : $Date: 2009-02-13 18:22:48 +0200 (Fri, 13 Feb 2009) $
// File revision : $Revision: 4 $
//
// $Id: cpu_detect_x86_win.cpp 62 2009-02-13 16:22:48Z oparviai $
//
////////////////////////////////////////////////////////////////////////////////
//
// 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 "cpu_detect.h"

#ifndef WIN32
#error wrong platform - this source code file is exclusively for Win32 platform
#endif

//////////////////////////////////////////////////////////////////////////////
//
// 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)
{
    uint res = 0;

    if (_dwDisabledISA == 0xffffffff) return 0;

    _asm
    {
        ; check if 'cpuid' instructions is available by toggling eflags bit 21
        ;
        xor     esi, esi            ; clear esi = result register

        pushfd                      ; save eflags to stack
        mov     eax,dword ptr [esp] ; load eax from stack (with eflags)
        mov     ecx, eax            ; save the original eflags values to ecx
        xor     eax, 0x00200000     ; toggle bit 21
        mov     dword ptr [esp],eax ; store toggled eflags to stack
        popfd                       ; load eflags from stack

        pushfd                      ; save updated eflags to stack
        mov     eax,dword ptr [esp] ; load eax from stack
        popfd                       ; pop stack to restore stack pointer

        xor     edx, edx            ; clear edx for defaulting no mmx
        cmp     eax, ecx            ; compare to original eflags values
        jz      end                 ; jumps to 'end' if cpuid not present

        ; cpuid instruction available, test for presence of mmx instructions
        mov     eax, 1
        cpuid
        test    edx, 0x00800000
        jz      end                 ; branch if MMX not available

        or      esi, SUPPORT_MMX    ; otherwise add MMX support bit

        test    edx, 0x02000000
        jz      test3DNow           ; branch if SSE not available

        or      esi, SUPPORT_SSE    ; otherwise add SSE support bit

    test3DNow:
        ; test for precense of AMD extensions
        mov     eax, 0x80000000
        cpuid
        cmp     eax, 0x80000000
        jbe     end                ; branch if no AMD extensions detected

        ; test for precense of 3DNow! extension
        mov     eax, 0x80000001
        cpuid
        test    edx, 0x80000000
        jz      end                 ; branch if 3DNow! not detected

        or      esi, SUPPORT_3DNOW  ; otherwise add 3DNow support bit

    end:

        mov     res, esi
    }

    return res & ~_dwDisabledISA;
}
1	////////////////////////////////////////////////////////////////////////////////
2	///
3	/// Win32 version of the x86 CPU detect routine.
4	///
5	/// This file is to be compiled in Windows platform with Microsoft Visual C++
6	/// Compiler. Please see 'cpu_detect_x86_gcc.cpp' for the gcc compiler version
7	/// for all GNU platforms.
8	///
9	/// Author : Copyright (c) Olli Parviainen
10	/// Author e-mail : oparviai 'at' iki.fi
11	/// SoundTouch WWW: http://www.surina.net/soundtouch
12	///
13	////////////////////////////////////////////////////////////////////////////////
14	//
15	// Last changed : $Date: 2009-02-13 18:22:48 +0200 (Fri, 13 Feb 2009) $
16	// File revision : $Revision: 4 $
17	//
18	// $Id: cpu_detect_x86_win.cpp 62 2009-02-13 16:22:48Z oparviai $
19	//
20	////////////////////////////////////////////////////////////////////////////////
21	//
22	// License :
23	//
24	// SoundTouch audio processing library
25	// Copyright (c) Olli Parviainen
26	//
27	// This library is free software; you can redistribute it and/or
28	// modify it under the terms of the GNU Lesser General Public
29	// License as published by the Free Software Foundation; either
30	// version 2.1 of the License, or (at your option) any later version.
31	//
32	// This library is distributed in the hope that it will be useful,
33	// but WITHOUT ANY WARRANTY; without even the implied warranty of
34	// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
35	// Lesser General Public License for more details.
36	//
37	// You should have received a copy of the GNU Lesser General Public
38	// License along with this library; if not, write to the Free Software
39	// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
40	//
41	////////////////////////////////////////////////////////////////////////////////
42
43	#include "cpu_detect.h"
44
45	#ifndef WIN32
46	#error wrong platform - this source code file is exclusively for Win32 platform
47	#endif
48
49	//////////////////////////////////////////////////////////////////////////////
50	//
51	// processor instructions extension detection routines
52	//
53	//////////////////////////////////////////////////////////////////////////////
54
55	// Flag variable indicating whick ISA extensions are disabled (for debugging)
56	static uint _dwDisabledISA = 0x00; // 0xffffffff; //<- use this to disable all extensions
57
58
59	// Disables given set of instruction extensions. See SUPPORT_... defines.
60	void disableExtensions(uint dwDisableMask)
61	{
62	_dwDisabledISA = dwDisableMask;
63	}
64
65
66
67	/// Checks which instruction set extensions are supported by the CPU.
68	uint detectCPUextensions(void)
69	{
70	uint res = 0;
71
72	if (_dwDisabledISA == 0xffffffff) return 0;
73
74	_asm
75	{
76	; check if 'cpuid' instructions is available by toggling eflags bit 21
77	;
78	xor esi, esi ; clear esi = result register
79
80	pushfd ; save eflags to stack
81	mov eax,dword ptr [esp] ; load eax from stack (with eflags)
82	mov ecx, eax ; save the original eflags values to ecx
83	xor eax, 0x00200000 ; toggle bit 21
84	mov dword ptr [esp],eax ; store toggled eflags to stack
85	popfd ; load eflags from stack
86
87	pushfd ; save updated eflags to stack
88	mov eax,dword ptr [esp] ; load eax from stack
89	popfd ; pop stack to restore stack pointer
90
91	xor edx, edx ; clear edx for defaulting no mmx
92	cmp eax, ecx ; compare to original eflags values
93	jz end ; jumps to 'end' if cpuid not present
94
95	; cpuid instruction available, test for presence of mmx instructions
96	mov eax, 1
97	cpuid
98	test edx, 0x00800000
99	jz end ; branch if MMX not available
100
101	or esi, SUPPORT_MMX ; otherwise add MMX support bit
102
103	test edx, 0x02000000
104	jz test3DNow ; branch if SSE not available
105
106	or esi, SUPPORT_SSE ; otherwise add SSE support bit
107
108	test3DNow:
109	; test for precense of AMD extensions
110	mov eax, 0x80000000
111	cpuid
112	cmp eax, 0x80000000
113	jbe end ; branch if no AMD extensions detected
114
115	; test for precense of 3DNow! extension
116	mov eax, 0x80000001
117	cpuid
118	test edx, 0x80000000
119	jz end ; branch if 3DNow! not detected
120
121	or esi, SUPPORT_3DNOW ; otherwise add 3DNow support bit
122
123	end:
124
125	mov res, esi
126	}
127
128	return res & ~_dwDisabledISA;
129	}