slouken@739
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/*
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slouken@739
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SDL - Simple DirectMedia Layer
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slouken@769
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Copyright (C) 1997-2004 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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slouken@793
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#ifdef unix /* FIXME: Better setjmp detection? */
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#define USE_SETJMP
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#include <signal.h>
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#include <setjmp.h>
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#endif
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#include "SDL.h"
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#include "SDL_cpuinfo.h"
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slouken@778
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#ifdef MACOSX
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#include <sys/sysctl.h> /* For AltiVec check */
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#endif
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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_MMXEXT 0x00000004
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#define CPU_HAS_3DNOW 0x00000010
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#define CPU_HAS_3DNOWEXT 0x00000020
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#define CPU_HAS_SSE 0x00000040
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#define CPU_HAS_SSE2 0x00000080
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#define CPU_HAS_ALTIVEC 0x00000100
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#ifdef USE_SETJMP
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/* This is the brute force way of detecting instruction sets...
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the idea is borrowed from the libmpeg2 library - thanks!
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*/
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static jmp_buf jmpbuf;
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static void illegal_instruction(int sig)
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{
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longjmp(jmpbuf, 1);
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}
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#endif // USE_SETJMP
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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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" 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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: "=m" (has_CPUID)
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:
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: "%eax", "%ecx"
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);
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#elif defined(__GNUC__) && defined(__x86_64__)
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/* Technically, if this is being compiled under __x86_64__ then it has
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CPUid by definition. But it's nice to be able to prove it. :) */
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__asm__ (
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" pushfq # Get original EFLAGS \n"
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slouken@881
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" popq %%rax \n"
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slouken@881
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" movq %%rax,%%rcx \n"
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slouken@881
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" xorl $0x200000,%%eax # Flip ID bit in EFLAGS \n"
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slouken@881
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" pushq %%rax # Save new EFLAGS value on stack \n"
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slouken@881
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" popfq # Replace current EFLAGS value \n"
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slouken@881
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" pushfq # Get new EFLAGS \n"
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slouken@881
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" popq %%rax # Store new EFLAGS in EAX \n"
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slouken@881
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" xorl %%ecx,%%eax # Can not toggle ID bit, \n"
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slouken@881
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" jz 1f # Processor=80486 \n"
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slouken@881
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" movl $1,%0 # We have CPUID support \n"
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"1: \n"
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: "=m" (has_CPUID)
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:
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: "%rax", "%rcx"
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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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slouken@881
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#if defined(__GNUC__) && ( defined(i386) || defined(__x86_64__) )
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__asm__ (
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slouken@785
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" movl %%ebx,%%edi\n"
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" xorl %%eax,%%eax # Set up for CPUID instruction \n"
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slouken@745
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" cpuid # Get and save vendor ID \n"
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slouken@745
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" cmpl $1,%%eax # Make sure 1 is valid input for CPUID\n"
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slouken@745
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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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slouken@745
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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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" movl %%edi,%%ebx\n"
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: "=m" (features)
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:
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: "%eax", "%ebx", "%ecx", "%edx", "%edi"
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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_getCPUIDFeaturesExt()
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slouken@785
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{
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slouken@785
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int features = 0;
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slouken@881
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#if defined(__GNUC__) && (defined(i386) || defined (__x86_64__) )
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__asm__ (
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slouken@785
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" movl %%ebx,%%edi\n"
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slouken@785
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" movl $0x80000000,%%eax # Query for extended functions \n"
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slouken@785
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" cpuid # Get extended function limit \n"
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slouken@785
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" cmpl $0x80000001,%%eax \n"
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slouken@787
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" jl 1f # Nope, we dont have function 800000001h\n"
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slouken@785
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" movl $0x80000001,%%eax # Setup extended function 800000001h\n"
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slouken@785
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" cpuid # and get the information \n"
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slouken@785
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" movl %%edx,%0 \n"
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slouken@785
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"1: \n"
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slouken@785
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" movl %%edi,%%ebx\n"
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slouken@785
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: "=m" (features)
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slouken@785
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:
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slouken@785
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: "%eax", "%ebx", "%ecx", "%edx", "%edi"
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);
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slouken@785
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#elif defined(_MSC_VER)
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slouken@785
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__asm {
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slouken@785
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mov eax,80000000h ; Query for extended functions
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slouken@785
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cpuid ; Get extended function limit
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slouken@785
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cmp eax,80000001h
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slouken@787
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jl done ; Nope, we dont have function 800000001h
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slouken@785
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mov eax,80000001h ; Setup extended function 800000001h
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cpuid ; and get the information
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mov features,edx
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done:
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slouken@785
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}
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slouken@785
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#endif
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slouken@785
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return features;
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slouken@785
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}
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slouken@785
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slouken@745
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static __inline__ int CPU_haveRDTSC()
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slouken@745
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{
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slouken@745
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if ( CPU_haveCPUID() ) {
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slouken@745
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return (CPU_getCPUIDFeatures() & 0x00000010);
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slouken@745
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}
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slouken@745
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return 0;
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slouken@745
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}
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slouken@739
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slouken@745
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static __inline__ int CPU_haveMMX()
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slouken@745
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{
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slouken@745
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if ( CPU_haveCPUID() ) {
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slouken@745
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return (CPU_getCPUIDFeatures() & 0x00800000);
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slouken@745
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}
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slouken@745
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return 0;
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slouken@745
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}
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slouken@745
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slouken@785
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static __inline__ int CPU_haveMMXExt()
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slouken@785
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{
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slouken@785
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if ( CPU_haveCPUID() ) {
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slouken@785
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return (CPU_getCPUIDFeaturesExt() & 0x00400000);
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slouken@785
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}
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slouken@785
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return 0;
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slouken@785
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}
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slouken@785
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slouken@745
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static __inline__ int CPU_have3DNow()
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slouken@745
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{
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slouken@785
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if ( CPU_haveCPUID() ) {
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slouken@785
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return (CPU_getCPUIDFeaturesExt() & 0x80000000);
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slouken@747
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}
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slouken@785
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return 0;
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slouken@785
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}
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slouken@785
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224 |
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slouken@785
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static __inline__ int CPU_have3DNowExt()
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slouken@785
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226 |
{
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slouken@785
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227 |
if ( CPU_haveCPUID() ) {
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slouken@785
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return (CPU_getCPUIDFeaturesExt() & 0x40000000);
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slouken@745
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229 |
}
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slouken@785
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230 |
return 0;
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slouken@745
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231 |
}
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slouken@745
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232 |
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slouken@745
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233 |
static __inline__ int CPU_haveSSE()
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slouken@745
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234 |
{
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slouken@745
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235 |
if ( CPU_haveCPUID() ) {
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slouken@745
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236 |
return (CPU_getCPUIDFeatures() & 0x02000000);
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slouken@745
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237 |
}
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slouken@745
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238 |
return 0;
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slouken@745
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239 |
}
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slouken@739
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240 |
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slouken@785
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241 |
static __inline__ int CPU_haveSSE2()
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slouken@785
|
242 |
{
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slouken@785
|
243 |
if ( CPU_haveCPUID() ) {
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slouken@785
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244 |
return (CPU_getCPUIDFeatures() & 0x04000000);
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slouken@785
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245 |
}
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slouken@785
|
246 |
return 0;
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slouken@785
|
247 |
}
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slouken@785
|
248 |
|
slouken@778
|
249 |
static __inline__ int CPU_haveAltiVec()
|
slouken@778
|
250 |
{
|
slouken@796
|
251 |
volatile int altivec = 0;
|
slouken@778
|
252 |
#ifdef MACOSX
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slouken@778
|
253 |
int selectors[2] = { CTL_HW, HW_VECTORUNIT };
|
slouken@778
|
254 |
int hasVectorUnit = 0;
|
slouken@778
|
255 |
size_t length = sizeof(hasVectorUnit);
|
slouken@778
|
256 |
int error = sysctl(selectors, 2, &hasVectorUnit, &length, NULL, 0);
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slouken@778
|
257 |
if( 0 == error )
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slouken@793
|
258 |
altivec = (hasVectorUnit != 0);
|
slouken@795
|
259 |
#elif defined(USE_SETJMP) && defined(GCC_ALTIVEC)
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slouken@793
|
260 |
void (*handler)(int sig);
|
slouken@793
|
261 |
handler = signal(SIGILL, illegal_instruction);
|
slouken@793
|
262 |
if ( setjmp(jmpbuf) == 0 ) {
|
slouken@793
|
263 |
asm volatile ("mtspr 256, %0\n\t"
|
slouken@793
|
264 |
"vand %%v0, %%v0, %%v0"
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slouken@793
|
265 |
:
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slouken@793
|
266 |
: "r" (-1));
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slouken@793
|
267 |
altivec = 1;
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slouken@793
|
268 |
}
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slouken@793
|
269 |
signal(SIGILL, handler);
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slouken@778
|
270 |
#endif
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slouken@793
|
271 |
return altivec;
|
slouken@778
|
272 |
}
|
slouken@778
|
273 |
|
slouken@739
|
274 |
static Uint32 SDL_CPUFeatures = 0xFFFFFFFF;
|
slouken@739
|
275 |
|
slouken@739
|
276 |
static Uint32 SDL_GetCPUFeatures()
|
slouken@739
|
277 |
{
|
slouken@739
|
278 |
if ( SDL_CPUFeatures == 0xFFFFFFFF ) {
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slouken@739
|
279 |
SDL_CPUFeatures = 0;
|
slouken@745
|
280 |
if ( CPU_haveRDTSC() ) {
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slouken@745
|
281 |
SDL_CPUFeatures |= CPU_HAS_RDTSC;
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slouken@745
|
282 |
}
|
slouken@739
|
283 |
if ( CPU_haveMMX() ) {
|
slouken@739
|
284 |
SDL_CPUFeatures |= CPU_HAS_MMX;
|
slouken@739
|
285 |
}
|
slouken@786
|
286 |
if ( CPU_haveMMXExt() ) {
|
slouken@786
|
287 |
SDL_CPUFeatures |= CPU_HAS_MMXEXT;
|
slouken@786
|
288 |
}
|
slouken@739
|
289 |
if ( CPU_have3DNow() ) {
|
slouken@739
|
290 |
SDL_CPUFeatures |= CPU_HAS_3DNOW;
|
slouken@739
|
291 |
}
|
slouken@786
|
292 |
if ( CPU_have3DNowExt() ) {
|
slouken@786
|
293 |
SDL_CPUFeatures |= CPU_HAS_3DNOWEXT;
|
slouken@786
|
294 |
}
|
slouken@739
|
295 |
if ( CPU_haveSSE() ) {
|
slouken@739
|
296 |
SDL_CPUFeatures |= CPU_HAS_SSE;
|
slouken@739
|
297 |
}
|
slouken@786
|
298 |
if ( CPU_haveSSE2() ) {
|
slouken@786
|
299 |
SDL_CPUFeatures |= CPU_HAS_SSE2;
|
slouken@786
|
300 |
}
|
slouken@778
|
301 |
if ( CPU_haveAltiVec() ) {
|
slouken@778
|
302 |
SDL_CPUFeatures |= CPU_HAS_ALTIVEC;
|
slouken@778
|
303 |
}
|
slouken@739
|
304 |
}
|
slouken@739
|
305 |
return SDL_CPUFeatures;
|
slouken@739
|
306 |
}
|
slouken@739
|
307 |
|
slouken@745
|
308 |
SDL_bool SDL_HasRDTSC()
|
slouken@745
|
309 |
{
|
slouken@745
|
310 |
if ( SDL_GetCPUFeatures() & CPU_HAS_RDTSC ) {
|
slouken@745
|
311 |
return SDL_TRUE;
|
slouken@745
|
312 |
}
|
slouken@745
|
313 |
return SDL_FALSE;
|
slouken@745
|
314 |
}
|
slouken@745
|
315 |
|
slouken@739
|
316 |
SDL_bool SDL_HasMMX()
|
slouken@739
|
317 |
{
|
slouken@739
|
318 |
if ( SDL_GetCPUFeatures() & CPU_HAS_MMX ) {
|
slouken@739
|
319 |
return SDL_TRUE;
|
slouken@739
|
320 |
}
|
slouken@739
|
321 |
return SDL_FALSE;
|
slouken@739
|
322 |
}
|
slouken@739
|
323 |
|
slouken@804
|
324 |
SDL_bool SDL_HasMMXExt()
|
slouken@804
|
325 |
{
|
slouken@804
|
326 |
if ( SDL_GetCPUFeatures() & CPU_HAS_MMXEXT ) {
|
slouken@804
|
327 |
return SDL_TRUE;
|
slouken@804
|
328 |
}
|
slouken@804
|
329 |
return SDL_FALSE;
|
slouken@804
|
330 |
}
|
slouken@804
|
331 |
|
slouken@739
|
332 |
SDL_bool SDL_Has3DNow()
|
slouken@739
|
333 |
{
|
slouken@739
|
334 |
if ( SDL_GetCPUFeatures() & CPU_HAS_3DNOW ) {
|
slouken@739
|
335 |
return SDL_TRUE;
|
slouken@739
|
336 |
}
|
slouken@739
|
337 |
return SDL_FALSE;
|
slouken@739
|
338 |
}
|
slouken@739
|
339 |
|
slouken@804
|
340 |
SDL_bool SDL_Has3DNowExt()
|
slouken@804
|
341 |
{
|
slouken@804
|
342 |
if ( SDL_GetCPUFeatures() & CPU_HAS_3DNOWEXT ) {
|
slouken@804
|
343 |
return SDL_TRUE;
|
slouken@804
|
344 |
}
|
slouken@804
|
345 |
return SDL_FALSE;
|
slouken@804
|
346 |
}
|
slouken@804
|
347 |
|
slouken@739
|
348 |
SDL_bool SDL_HasSSE()
|
slouken@739
|
349 |
{
|
slouken@739
|
350 |
if ( SDL_GetCPUFeatures() & CPU_HAS_SSE ) {
|
slouken@739
|
351 |
return SDL_TRUE;
|
slouken@739
|
352 |
}
|
slouken@739
|
353 |
return SDL_FALSE;
|
slouken@739
|
354 |
}
|
slouken@739
|
355 |
|
slouken@804
|
356 |
SDL_bool SDL_HasSSE2()
|
slouken@804
|
357 |
{
|
slouken@804
|
358 |
if ( SDL_GetCPUFeatures() & CPU_HAS_SSE2 ) {
|
slouken@804
|
359 |
return SDL_TRUE;
|
slouken@804
|
360 |
}
|
slouken@804
|
361 |
return SDL_FALSE;
|
slouken@804
|
362 |
}
|
slouken@804
|
363 |
|
slouken@778
|
364 |
SDL_bool SDL_HasAltiVec()
|
slouken@778
|
365 |
{
|
slouken@778
|
366 |
if ( SDL_GetCPUFeatures() & CPU_HAS_ALTIVEC ) {
|
slouken@778
|
367 |
return SDL_TRUE;
|
slouken@778
|
368 |
}
|
slouken@778
|
369 |
return SDL_FALSE;
|
slouken@778
|
370 |
}
|
slouken@778
|
371 |
|
slouken@739
|
372 |
#ifdef TEST_MAIN
|
slouken@739
|
373 |
|
slouken@739
|
374 |
#include <stdio.h>
|
slouken@739
|
375 |
|
slouken@739
|
376 |
int main()
|
slouken@739
|
377 |
{
|
slouken@778
|
378 |
printf("RDTSC: %d\n", SDL_HasRDTSC());
|
slouken@739
|
379 |
printf("MMX: %d\n", SDL_HasMMX());
|
slouken@785
|
380 |
printf("MMXExt: %d\n", SDL_HasMMXExt());
|
slouken@739
|
381 |
printf("3DNow: %d\n", SDL_Has3DNow());
|
slouken@785
|
382 |
printf("3DNowExt: %d\n", SDL_Has3DNowExt());
|
slouken@739
|
383 |
printf("SSE: %d\n", SDL_HasSSE());
|
slouken@785
|
384 |
printf("SSE2: %d\n", SDL_HasSSE2());
|
slouken@778
|
385 |
printf("AltiVec: %d\n", SDL_HasAltiVec());
|
slouken@745
|
386 |
return 0;
|
slouken@739
|
387 |
}
|
slouken@739
|
388 |
|
slouken@739
|
389 |
#endif /* TEST_MAIN */
|