slouken@739
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/*
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SDL - Simple DirectMedia Layer
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Copyright (C) 1997, 1998, 1999, 2000, 2001, 2002 Sam Lantinga
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This library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Library General Public
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License as published by the Free Software Foundation; either
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version 2 of the License, or (at your option) any later version.
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This library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Library General Public License for more details.
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You should have received a copy of the GNU Library General Public
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License along with this library; if not, write to the Free
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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Sam Lantinga
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slouken@libsdl.org
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*/
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#ifdef SAVE_RCSID
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static char rcsid =
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"@(#) $Id$";
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#endif
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/* CPU feature detection for SDL */
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#include "SDL.h"
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#include "SDL_cpuinfo.h"
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#define CPU_HAS_RDTSC 0x00000001
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#define CPU_HAS_MMX 0x00000002
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#define CPU_HAS_3DNOW 0x00000004
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#define CPU_HAS_SSE 0x00000008
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static __inline__ int CPU_haveCPUID()
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{
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int has_CPUID = 0;
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#if defined(__GNUC__) && defined(i386)
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__asm__ (
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"push %%ecx\n"
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" pushfl # Get original EFLAGS \n"
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" popl %%eax \n"
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" movl %%eax,%%ecx \n"
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" xorl $0x200000,%%eax # Flip ID bit in EFLAGS \n"
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" pushl %%eax # Save new EFLAGS value on stack \n"
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" popfl # Replace current EFLAGS value \n"
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" pushfl # Get new EFLAGS \n"
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" popl %%eax # Store new EFLAGS in EAX \n"
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" xorl %%ecx,%%eax # Can not toggle ID bit, \n"
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" jz 1f # Processor=80486 \n"
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" movl $1,%0 # We have CPUID support \n"
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"1: \n"
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"pop %%ecx\n"
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: "=r" (has_CPUID)
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:
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: "%eax", "%ecx"
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);
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#elif defined(_MSC_VER)
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__asm__ {
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pushfd ; Get original EFLAGS
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pop eax
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mov ecx, eax
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xor eax, 200000h ; Flip ID bit in EFLAGS
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push eax ; Save new EFLAGS value on stack
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popfd ; Replace current EFLAGS value
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pushfd ; Get new EFLAGS
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pop eax ; Store new EFLAGS in EAX
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xor eax, ecx ; Can not toggle ID bit,
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jz done ; Processor=80486
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mov has_CPUID,1 ; We have CPUID support
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done:
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}
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#endif
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return has_CPUID;
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}
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static __inline__ int CPU_getCPUIDFeatures()
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{
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int features = 0;
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#if defined(__GNUC__) && defined(i386)
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__asm__ (
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"push %%ebx\n"
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"push %%ecx\n"
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"push %%edx\n"
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" xorl %%eax,%%eax # Set up for CPUID instruction \n"
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" cpuid # Get and save vendor ID \n"
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" cmpl $1,%%eax # Make sure 1 is valid input for CPUID\n"
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" jl 1f # We dont have the CPUID instruction\n"
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" xorl %%eax,%%eax \n"
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" incl %%eax \n"
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" cpuid # Get family/model/stepping/features\n"
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" movl %%edx,%0 \n"
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"1: \n"
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"pop %%edx\n"
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"pop %%ecx\n"
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"pop %%ebx\n"
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: "=r" (features)
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:
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: "%eax", "%ebx", "%ecx", "%edx"
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);
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#elif defined(_MSC_VER)
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__asm__ {
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xor eax, eax ; Set up for CPUID instruction
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cpuid ; Get and save vendor ID
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cmp eax, 1 ; Make sure 1 is valid input for CPUID
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jl done ; We dont have the CPUID instruction
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xor eax, eax
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inc eax
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cpuid ; Get family/model/stepping/features
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mov features, edx
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done:
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}
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#endif
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return features;
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}
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static __inline__ int CPU_haveRDTSC()
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{
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if ( CPU_haveCPUID() ) {
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return (CPU_getCPUIDFeatures() & 0x00000010);
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}
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return 0;
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}
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static __inline__ int CPU_haveMMX()
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{
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if ( CPU_haveCPUID() ) {
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return (CPU_getCPUIDFeatures() & 0x00800000);
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}
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return 0;
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}
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static __inline__ int CPU_have3DNow()
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{
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int has_3DNow = 0;
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#if defined(__GNUC__) && defined(i386)
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__asm__ (
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"push %%ebx\n"
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"push %%ecx\n"
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"push %%edx\n"
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" movl $0x80000000,%%eax # Query for extended functions \n"
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" cpuid # Get extended function limit \n"
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" cmpl $0x80000001,%%eax \n"
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" jbe 1f # Nope, we dont have function 800000001h\n"
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" movl $0x80000001,%%eax # Setup extended function 800000001h\n"
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" cpuid # and get the information \n"
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" testl $0x80000000,%%edx # Bit 31 is set if 3DNow! present \n"
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" jz 1f # Nope, we dont have 3DNow support\n"
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" movl $1,%0 # Yep, we have 3DNow! support! \n"
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"1: \n"
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"pop %%edx\n"
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"pop %%ecx\n"
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"pop %%ebx\n"
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: "=r" (has_3DNow)
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:
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: "%eax", "%ebx", "%ecx", "%edx"
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);
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#elif defined(_MSC_VER)
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__asm__ {
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mov eax,80000000h ; Query for extended functions
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cpuid ; Get extended function limit
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cmp eax,80000001h
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jbe done ; Nope, we dont have function 800000001h
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mov eax,80000001h ; Setup extended function 800000001h
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cpuid ; and get the information
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test edx,80000000h ; Bit 31 is set if 3DNow! present
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jz done ; Nope, we dont have 3DNow support
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mov has_3DNow,1 ; Yep, we have 3DNow! support!
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done:
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}
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#endif
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return has_3DNow;
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}
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static __inline__ int CPU_haveSSE()
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{
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if ( CPU_haveCPUID() ) {
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return (CPU_getCPUIDFeatures() & 0x02000000);
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}
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return 0;
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}
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static Uint32 SDL_CPUFeatures = 0xFFFFFFFF;
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static Uint32 SDL_GetCPUFeatures()
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{
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if ( SDL_CPUFeatures == 0xFFFFFFFF ) {
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SDL_CPUFeatures = 0;
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if ( CPU_haveRDTSC() ) {
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SDL_CPUFeatures |= CPU_HAS_RDTSC;
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}
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if ( CPU_haveMMX() ) {
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SDL_CPUFeatures |= CPU_HAS_MMX;
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}
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if ( CPU_have3DNow() ) {
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SDL_CPUFeatures |= CPU_HAS_3DNOW;
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}
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if ( CPU_haveSSE() ) {
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SDL_CPUFeatures |= CPU_HAS_SSE;
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}
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}
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return SDL_CPUFeatures;
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}
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SDL_bool SDL_HasRDTSC()
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{
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if ( SDL_GetCPUFeatures() & CPU_HAS_RDTSC ) {
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return SDL_TRUE;
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}
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return SDL_FALSE;
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}
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SDL_bool SDL_HasMMX()
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{
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if ( SDL_GetCPUFeatures() & CPU_HAS_MMX ) {
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return SDL_TRUE;
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}
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return SDL_FALSE;
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}
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SDL_bool SDL_Has3DNow()
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{
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if ( SDL_GetCPUFeatures() & CPU_HAS_3DNOW ) {
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return SDL_TRUE;
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}
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return SDL_FALSE;
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}
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SDL_bool SDL_HasSSE()
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{
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if ( SDL_GetCPUFeatures() & CPU_HAS_SSE ) {
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return SDL_TRUE;
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}
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return SDL_FALSE;
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}
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#ifdef TEST_MAIN
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#include <stdio.h>
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int main()
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{
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printf("MMX: %d\n", SDL_HasMMX());
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printf("3DNow: %d\n", SDL_Has3DNow());
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printf("SSE: %d\n", SDL_HasSSE());
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return 0;
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}
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#endif /* TEST_MAIN */
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