src/cpuinfo/SDL_cpuinfo.c
author Sam Lantinga <slouken@libsdl.org>
Tue, 10 Feb 2004 15:31:35 +0000
changeset 804 b2fda076b02e
parent 796 dec19b813b04
child 881 9eb85a211abd
permissions -rw-r--r--
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/*
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    SDL - Simple DirectMedia Layer
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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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#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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#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(_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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"        movl    %%ebx,%%edi\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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"        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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   128
        jl      done                ; We dont have the CPUID instruction
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        xor     eax, eax
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   130
        inc     eax
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   131
        cpuid                       ; Get family/model/stepping/features
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        mov     features, edx
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   133
done:
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   134
	}
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   135
#endif
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   136
	return features;
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   137
}
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   138
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static __inline__ int CPU_getCPUIDFeaturesExt()
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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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"        movl    %%ebx,%%edi\n"
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"        movl    $0x80000000,%%eax   # Query for extended functions    \n"
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   146
"        cpuid                       # Get extended function limit     \n"
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"        cmpl    $0x80000001,%%eax                                     \n"
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"        jl      1f                  # Nope, we dont have function 800000001h\n"
785
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   149
"        movl    $0x80000001,%%eax   # Setup extended function 800000001h\n"
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"        cpuid                       # and get the information         \n"
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"        movl    %%edx,%0                                              \n"
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   152
"1:                                                                    \n"
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"        movl    %%edi,%%ebx\n"
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   154
	: "=m" (features)
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   155
	:
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	: "%eax", "%ebx", "%ecx", "%edx", "%edi"
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   157
	);
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   158
#elif defined(_MSC_VER)
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   159
	__asm {
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   160
        mov     eax,80000000h       ; Query for extended functions
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   161
        cpuid                       ; Get extended function limit
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        cmp     eax,80000001h
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   163
        jl      done                ; Nope, we dont have function 800000001h
785
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   164
        mov     eax,80000001h       ; Setup extended function 800000001h
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        cpuid                       ; and get the information
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   166
        mov     features,edx
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   167
done:
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   168
	}
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   169
#endif
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   170
	return features;
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   171
}
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   172
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static __inline__ int CPU_haveRDTSC()
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   174
{
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	if ( CPU_haveCPUID() ) {
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		return (CPU_getCPUIDFeatures() & 0x00000010);
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   177
	}
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	return 0;
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   179
}
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22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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static __inline__ int CPU_haveMMX()
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   182
{
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   183
	if ( CPU_haveCPUID() ) {
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		return (CPU_getCPUIDFeatures() & 0x00800000);
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   185
	}
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   186
	return 0;
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   187
}
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   188
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ca06a994f03c Fixed bugs in CPU feature detection and added extended feature detection
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   189
static __inline__ int CPU_haveMMXExt()
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   190
{
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   191
	if ( CPU_haveCPUID() ) {
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   192
		return (CPU_getCPUIDFeaturesExt() & 0x00400000);
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   193
	}
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   194
	return 0;
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   195
}
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   196
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   197
static __inline__ int CPU_have3DNow()
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   198
{
785
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   199
	if ( CPU_haveCPUID() ) {
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   200
		return (CPU_getCPUIDFeaturesExt() & 0x80000000);
747
da36f59485da Check for CPUID before checking for 3DNow!
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diff changeset
   201
	}
785
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   202
	return 0;
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diff changeset
   203
}
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   204
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   205
static __inline__ int CPU_have3DNowExt()
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   206
{
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   207
	if ( CPU_haveCPUID() ) {
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   208
		return (CPU_getCPUIDFeaturesExt() & 0x40000000);
745
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diff changeset
   209
	}
785
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   210
	return 0;
745
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diff changeset
   211
}
71ee03909f42 Greatly simplified the SDL CPU info code
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diff changeset
   212
71ee03909f42 Greatly simplified the SDL CPU info code
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   213
static __inline__ int CPU_haveSSE()
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   214
{
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   215
	if ( CPU_haveCPUID() ) {
71ee03909f42 Greatly simplified the SDL CPU info code
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   216
		return (CPU_getCPUIDFeatures() & 0x02000000);
71ee03909f42 Greatly simplified the SDL CPU info code
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diff changeset
   217
	}
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   218
	return 0;
71ee03909f42 Greatly simplified the SDL CPU info code
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diff changeset
   219
}
739
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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parents:
diff changeset
   220
785
ca06a994f03c Fixed bugs in CPU feature detection and added extended feature detection
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   221
static __inline__ int CPU_haveSSE2()
ca06a994f03c Fixed bugs in CPU feature detection and added extended feature detection
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diff changeset
   222
{
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diff changeset
   223
	if ( CPU_haveCPUID() ) {
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   224
		return (CPU_getCPUIDFeatures() & 0x04000000);
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diff changeset
   225
	}
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diff changeset
   226
	return 0;
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diff changeset
   227
}
ca06a994f03c Fixed bugs in CPU feature detection and added extended feature detection
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diff changeset
   228
778
8ac3f46f9d09 Date: Tue, 6 Jan 2004 12:42:19 +0100
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diff changeset
   229
static __inline__ int CPU_haveAltiVec()
8ac3f46f9d09 Date: Tue, 6 Jan 2004 12:42:19 +0100
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parents: 769
diff changeset
   230
{
796
dec19b813b04 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents: 795
diff changeset
   231
	volatile int altivec = 0;
778
8ac3f46f9d09 Date: Tue, 6 Jan 2004 12:42:19 +0100
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diff changeset
   232
#ifdef MACOSX
8ac3f46f9d09 Date: Tue, 6 Jan 2004 12:42:19 +0100
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diff changeset
   233
	int selectors[2] = { CTL_HW, HW_VECTORUNIT }; 
8ac3f46f9d09 Date: Tue, 6 Jan 2004 12:42:19 +0100
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parents: 769
diff changeset
   234
	int hasVectorUnit = 0; 
8ac3f46f9d09 Date: Tue, 6 Jan 2004 12:42:19 +0100
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parents: 769
diff changeset
   235
	size_t length = sizeof(hasVectorUnit); 
8ac3f46f9d09 Date: Tue, 6 Jan 2004 12:42:19 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
   236
	int error = sysctl(selectors, 2, &hasVectorUnit, &length, NULL, 0); 
8ac3f46f9d09 Date: Tue, 6 Jan 2004 12:42:19 +0100
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parents: 769
diff changeset
   237
	if( 0 == error )
793
c20f08c4f437 Altivec detection on non-MacOS X systems
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parents: 787
diff changeset
   238
		altivec = (hasVectorUnit != 0); 
795
275708f2e838 Check for altivec assembly support before trying to use it. :)
Sam Lantinga <slouken@libsdl.org>
parents: 793
diff changeset
   239
#elif defined(USE_SETJMP) && defined(GCC_ALTIVEC)
793
c20f08c4f437 Altivec detection on non-MacOS X systems
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parents: 787
diff changeset
   240
	void (*handler)(int sig);
c20f08c4f437 Altivec detection on non-MacOS X systems
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diff changeset
   241
	handler = signal(SIGILL, illegal_instruction);
c20f08c4f437 Altivec detection on non-MacOS X systems
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diff changeset
   242
	if ( setjmp(jmpbuf) == 0 ) {
c20f08c4f437 Altivec detection on non-MacOS X systems
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diff changeset
   243
		asm volatile ("mtspr 256, %0\n\t"
c20f08c4f437 Altivec detection on non-MacOS X systems
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parents: 787
diff changeset
   244
			      "vand %%v0, %%v0, %%v0"
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parents: 787
diff changeset
   245
			      :
c20f08c4f437 Altivec detection on non-MacOS X systems
Sam Lantinga <slouken@libsdl.org>
parents: 787
diff changeset
   246
			      : "r" (-1));
c20f08c4f437 Altivec detection on non-MacOS X systems
Sam Lantinga <slouken@libsdl.org>
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diff changeset
   247
		altivec = 1;
c20f08c4f437 Altivec detection on non-MacOS X systems
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parents: 787
diff changeset
   248
	}
c20f08c4f437 Altivec detection on non-MacOS X systems
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parents: 787
diff changeset
   249
	signal(SIGILL, handler);
778
8ac3f46f9d09 Date: Tue, 6 Jan 2004 12:42:19 +0100
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parents: 769
diff changeset
   250
#endif
793
c20f08c4f437 Altivec detection on non-MacOS X systems
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parents: 787
diff changeset
   251
	return altivec; 
778
8ac3f46f9d09 Date: Tue, 6 Jan 2004 12:42:19 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
   252
}
8ac3f46f9d09 Date: Tue, 6 Jan 2004 12:42:19 +0100
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diff changeset
   253
739
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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parents:
diff changeset
   254
static Uint32 SDL_CPUFeatures = 0xFFFFFFFF;
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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parents:
diff changeset
   255
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   256
static Uint32 SDL_GetCPUFeatures()
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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parents:
diff changeset
   257
{
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   258
	if ( SDL_CPUFeatures == 0xFFFFFFFF ) {
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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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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   264
			SDL_CPUFeatures |= CPU_HAS_MMX;
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		}
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		if ( CPU_haveMMXExt() ) {
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			SDL_CPUFeatures |= CPU_HAS_MMXEXT;
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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_have3DNowExt() ) {
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			SDL_CPUFeatures |= CPU_HAS_3DNOWEXT;
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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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		if ( CPU_haveSSE2() ) {
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			SDL_CPUFeatures |= CPU_HAS_SSE2;
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		}
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		if ( CPU_haveAltiVec() ) {
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			SDL_CPUFeatures |= CPU_HAS_ALTIVEC;
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   283
		}
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	}
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	return SDL_CPUFeatures;
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   286
}
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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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   294
}
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   296
SDL_bool SDL_HasMMX()
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{
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   298
	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_HasMMXExt()
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{
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	if ( SDL_GetCPUFeatures() & CPU_HAS_MMXEXT ) {
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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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   316
	}
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	return SDL_FALSE;
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   318
}
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SDL_bool SDL_Has3DNowExt()
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{
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	if ( SDL_GetCPUFeatures() & CPU_HAS_3DNOWEXT ) {
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		return SDL_TRUE;
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	}
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	return SDL_FALSE;
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   326
}
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SDL_bool SDL_HasSSE()
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{
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   330
	if ( SDL_GetCPUFeatures() & CPU_HAS_SSE ) {
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   331
		return SDL_TRUE;
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   332
	}
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   333
	return SDL_FALSE;
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   334
}
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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   335
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   336
SDL_bool SDL_HasSSE2()
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   337
{
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   338
	if ( SDL_GetCPUFeatures() & CPU_HAS_SSE2 ) {
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   339
		return SDL_TRUE;
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   340
	}
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   341
	return SDL_FALSE;
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   342
}
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   343
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SDL_bool SDL_HasAltiVec()
8ac3f46f9d09 Date: Tue, 6 Jan 2004 12:42:19 +0100
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   345
{
8ac3f46f9d09 Date: Tue, 6 Jan 2004 12:42:19 +0100
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   346
	if ( SDL_GetCPUFeatures() & CPU_HAS_ALTIVEC ) {
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   347
		return SDL_TRUE;
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   348
	}
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   349
	return SDL_FALSE;
8ac3f46f9d09 Date: Tue, 6 Jan 2004 12:42:19 +0100
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diff changeset
   350
}
8ac3f46f9d09 Date: Tue, 6 Jan 2004 12:42:19 +0100
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   351
739
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   352
#ifdef TEST_MAIN
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   353
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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   354
#include <stdio.h>
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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   355
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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   356
int main()
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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   357
{
778
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   358
	printf("RDTSC: %d\n", SDL_HasRDTSC());
739
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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diff changeset
   359
	printf("MMX: %d\n", SDL_HasMMX());
785
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diff changeset
   360
	printf("MMXExt: %d\n", SDL_HasMMXExt());
739
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   361
	printf("3DNow: %d\n", SDL_Has3DNow());
785
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diff changeset
   362
	printf("3DNowExt: %d\n", SDL_Has3DNowExt());
739
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diff changeset
   363
	printf("SSE: %d\n", SDL_HasSSE());
785
ca06a994f03c Fixed bugs in CPU feature detection and added extended feature detection
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diff changeset
   364
	printf("SSE2: %d\n", SDL_HasSSE2());
778
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diff changeset
   365
	printf("AltiVec: %d\n", SDL_HasAltiVec());
745
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   366
	return 0;
739
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diff changeset
   367
}
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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   368
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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   369
#endif /* TEST_MAIN */