src/cpuinfo/SDL_cpuinfo.c
author Sam Lantinga <slouken@libsdl.org>
Thu, 08 Dec 2005 14:48:21 +0000
changeset 1198 b616ac4f39d1
parent 1152 51a8702d8ecd
child 1229 1430f5fe092a
permissions -rw-r--r--
Fixed gcc 4 warnings
Ignore whitespace changes - Everywhere: Within whitespace: At end of lines:
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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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#if defined(USE_SETJMP) && defined(GCC_ALTIVEC)
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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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"        popq    %%rax                                                 \n"
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"        movq    %%rax,%%rcx                                           \n"
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"        xorl    $0x200000,%%eax     # Flip ID bit in EFLAGS           \n"
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"        pushq   %%rax               # Save new EFLAGS value on stack  \n"
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"        popfq                       # Replace current EFLAGS value    \n"
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"        pushfq                      # Get new EFLAGS                  \n"
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"        popq    %%rax               # 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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	: "%rax", "%rcx"
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	);
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#elif defined(_MSC_VER) && (defined(_M_IX86) || defined(_X86_))
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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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   122
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   123
static __inline__ int CPU_getCPUIDFeatures()
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   124
{
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   125
	int features = 0;
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   126
#if defined(__GNUC__) && ( defined(i386) || defined(__x86_64__) )
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   127
	__asm__ (
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   128
"        movl    %%ebx,%%edi\n"
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   129
"        xorl    %%eax,%%eax         # Set up for CPUID instruction    \n"
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   130
"        cpuid                       # Get and save vendor ID          \n"
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   131
"        cmpl    $1,%%eax            # Make sure 1 is valid input for CPUID\n"
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   132
"        jl      1f                  # We dont have the CPUID instruction\n"
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   133
"        xorl    %%eax,%%eax                                           \n"
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   134
"        incl    %%eax                                                 \n"
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   135
"        cpuid                       # Get family/model/stepping/features\n"
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   136
"        movl    %%edx,%0                                              \n"
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   137
"1:                                                                    \n"
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   138
"        movl    %%edi,%%ebx\n"
784
a2dde6aff60e *** empty log message ***
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   139
	: "=m" (features)
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   140
	:
887
b4b64bb88f2f Date: Mon, 10 May 2004 10:17:46 -0400
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   141
	: "%eax", "%ecx", "%edx", "%edi"
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   142
	);
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51a8702d8ecd Updates to PocketPC (WinCE) support, thanks to Dmitry Yakimov at
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   143
#elif defined(_MSC_VER)  && (defined(_M_IX86) || defined(_X86_))
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   144
	__asm {
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   145
        xor     eax, eax            ; Set up for CPUID instruction
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   146
        cpuid                       ; Get and save vendor ID
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   147
        cmp     eax, 1              ; Make sure 1 is valid input for CPUID
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   148
        jl      done                ; We dont have the CPUID instruction
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   149
        xor     eax, eax
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   150
        inc     eax
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   151
        cpuid                       ; Get family/model/stepping/features
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   152
        mov     features, edx
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   153
done:
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   154
	}
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   155
#endif
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   156
	return features;
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   157
}
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   158
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ca06a994f03c Fixed bugs in CPU feature detection and added extended feature detection
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   159
static __inline__ int CPU_getCPUIDFeaturesExt()
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   160
{
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   161
	int features = 0;
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   162
#if defined(__GNUC__) && (defined(i386) || defined (__x86_64__) )
785
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   163
	__asm__ (
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   164
"        movl    %%ebx,%%edi\n"
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   165
"        movl    $0x80000000,%%eax   # Query for extended functions    \n"
ca06a994f03c Fixed bugs in CPU feature detection and added extended feature detection
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parents: 784
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   166
"        cpuid                       # Get extended function limit     \n"
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   167
"        cmpl    $0x80000001,%%eax                                     \n"
787
07760c8854d1 Date: Sat, 24 Jan 2004 14:49:58 +0100
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parents: 786
diff changeset
   168
"        jl      1f                  # Nope, we dont have function 800000001h\n"
785
ca06a994f03c Fixed bugs in CPU feature detection and added extended feature detection
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   169
"        movl    $0x80000001,%%eax   # Setup extended function 800000001h\n"
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   170
"        cpuid                       # and get the information         \n"
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   171
"        movl    %%edx,%0                                              \n"
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   172
"1:                                                                    \n"
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   173
"        movl    %%edi,%%ebx\n"
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   174
	: "=m" (features)
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   175
	:
887
b4b64bb88f2f Date: Mon, 10 May 2004 10:17:46 -0400
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diff changeset
   176
	: "%eax", "%ecx", "%edx", "%edi"
785
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   177
	);
1152
51a8702d8ecd Updates to PocketPC (WinCE) support, thanks to Dmitry Yakimov at
Ryan C. Gordon <icculus@icculus.org>
parents: 887
diff changeset
   178
#elif defined(_MSC_VER)  && (defined(_M_IX86) || defined(_X86_))
785
ca06a994f03c Fixed bugs in CPU feature detection and added extended feature detection
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   179
	__asm {
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   180
        mov     eax,80000000h       ; Query for extended functions
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   181
        cpuid                       ; Get extended function limit
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   182
        cmp     eax,80000001h
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07760c8854d1 Date: Sat, 24 Jan 2004 14:49:58 +0100
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diff changeset
   183
        jl      done                ; Nope, we dont have function 800000001h
785
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diff changeset
   184
        mov     eax,80000001h       ; Setup extended function 800000001h
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   185
        cpuid                       ; and get the information
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diff changeset
   186
        mov     features,edx
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   187
done:
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   188
	}
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   189
#endif
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   190
	return features;
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   191
}
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   192
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71ee03909f42 Greatly simplified the SDL CPU info code
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   193
static __inline__ int CPU_haveRDTSC()
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   194
{
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   195
	if ( CPU_haveCPUID() ) {
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   196
		return (CPU_getCPUIDFeatures() & 0x00000010);
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   197
	}
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   198
	return 0;
71ee03909f42 Greatly simplified the SDL CPU info code
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   199
}
739
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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parents:
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   200
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   201
static __inline__ int CPU_haveMMX()
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   202
{
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   203
	if ( CPU_haveCPUID() ) {
71ee03909f42 Greatly simplified the SDL CPU info code
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   204
		return (CPU_getCPUIDFeatures() & 0x00800000);
71ee03909f42 Greatly simplified the SDL CPU info code
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   205
	}
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   206
	return 0;
71ee03909f42 Greatly simplified the SDL CPU info code
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   207
}
71ee03909f42 Greatly simplified the SDL CPU info code
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   208
785
ca06a994f03c Fixed bugs in CPU feature detection and added extended feature detection
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   209
static __inline__ int CPU_haveMMXExt()
ca06a994f03c Fixed bugs in CPU feature detection and added extended feature detection
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   210
{
ca06a994f03c Fixed bugs in CPU feature detection and added extended feature detection
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diff changeset
   211
	if ( CPU_haveCPUID() ) {
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   212
		return (CPU_getCPUIDFeaturesExt() & 0x00400000);
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   213
	}
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   214
	return 0;
ca06a994f03c Fixed bugs in CPU feature detection and added extended feature detection
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diff changeset
   215
}
ca06a994f03c Fixed bugs in CPU feature detection and added extended feature detection
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diff changeset
   216
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71ee03909f42 Greatly simplified the SDL CPU info code
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   217
static __inline__ int CPU_have3DNow()
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   218
{
785
ca06a994f03c Fixed bugs in CPU feature detection and added extended feature detection
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diff changeset
   219
	if ( CPU_haveCPUID() ) {
ca06a994f03c Fixed bugs in CPU feature detection and added extended feature detection
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diff changeset
   220
		return (CPU_getCPUIDFeaturesExt() & 0x80000000);
747
da36f59485da Check for CPUID before checking for 3DNow!
Sam Lantinga <slouken@libsdl.org>
parents: 745
diff changeset
   221
	}
785
ca06a994f03c Fixed bugs in CPU feature detection and added extended feature detection
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diff changeset
   222
	return 0;
ca06a994f03c Fixed bugs in CPU feature detection and added extended feature detection
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diff changeset
   223
}
ca06a994f03c Fixed bugs in CPU feature detection and added extended feature detection
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diff changeset
   224
ca06a994f03c Fixed bugs in CPU feature detection and added extended feature detection
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diff changeset
   225
static __inline__ int CPU_have3DNowExt()
ca06a994f03c Fixed bugs in CPU feature detection and added extended feature detection
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diff changeset
   226
{
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diff changeset
   227
	if ( CPU_haveCPUID() ) {
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diff changeset
   228
		return (CPU_getCPUIDFeaturesExt() & 0x40000000);
745
71ee03909f42 Greatly simplified the SDL CPU info code
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diff changeset
   229
	}
785
ca06a994f03c Fixed bugs in CPU feature detection and added extended feature detection
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   230
	return 0;
745
71ee03909f42 Greatly simplified the SDL CPU info code
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diff changeset
   231
}
71ee03909f42 Greatly simplified the SDL CPU info code
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diff changeset
   232
71ee03909f42 Greatly simplified the SDL CPU info code
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diff changeset
   233
static __inline__ int CPU_haveSSE()
71ee03909f42 Greatly simplified the SDL CPU info code
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diff changeset
   234
{
71ee03909f42 Greatly simplified the SDL CPU info code
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diff changeset
   235
	if ( CPU_haveCPUID() ) {
71ee03909f42 Greatly simplified the SDL CPU info code
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diff changeset
   236
		return (CPU_getCPUIDFeatures() & 0x02000000);
71ee03909f42 Greatly simplified the SDL CPU info code
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diff changeset
   237
	}
71ee03909f42 Greatly simplified the SDL CPU info code
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diff changeset
   238
	return 0;
71ee03909f42 Greatly simplified the SDL CPU info code
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parents: 739
diff changeset
   239
}
739
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   240
785
ca06a994f03c Fixed bugs in CPU feature detection and added extended feature detection
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diff changeset
   241
static __inline__ int CPU_haveSSE2()
ca06a994f03c Fixed bugs in CPU feature detection and added extended feature detection
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diff changeset
   242
{
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diff changeset
   243
	if ( CPU_haveCPUID() ) {
ca06a994f03c Fixed bugs in CPU feature detection and added extended feature detection
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diff changeset
   244
		return (CPU_getCPUIDFeatures() & 0x04000000);
ca06a994f03c Fixed bugs in CPU feature detection and added extended feature detection
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diff changeset
   245
	}
ca06a994f03c Fixed bugs in CPU feature detection and added extended feature detection
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diff changeset
   246
	return 0;
ca06a994f03c Fixed bugs in CPU feature detection and added extended feature detection
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diff changeset
   247
}
ca06a994f03c Fixed bugs in CPU feature detection and added extended feature detection
Sam Lantinga <slouken@libsdl.org>
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diff changeset
   248
778
8ac3f46f9d09 Date: Tue, 6 Jan 2004 12:42:19 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
   249
static __inline__ int CPU_haveAltiVec()
8ac3f46f9d09 Date: Tue, 6 Jan 2004 12:42:19 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
   250
{
796
dec19b813b04 *** empty log message ***
Sam Lantinga <slouken@libsdl.org>
parents: 795
diff changeset
   251
	volatile int altivec = 0;
778
8ac3f46f9d09 Date: Tue, 6 Jan 2004 12:42:19 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
   252
#ifdef MACOSX
8ac3f46f9d09 Date: Tue, 6 Jan 2004 12:42:19 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
   253
	int selectors[2] = { CTL_HW, HW_VECTORUNIT }; 
8ac3f46f9d09 Date: Tue, 6 Jan 2004 12:42:19 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
   254
	int hasVectorUnit = 0; 
8ac3f46f9d09 Date: Tue, 6 Jan 2004 12:42:19 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
   255
	size_t length = sizeof(hasVectorUnit); 
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	int error = sysctl(selectors, 2, &hasVectorUnit, &length, NULL, 0); 
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	if( 0 == error )
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		altivec = (hasVectorUnit != 0); 
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#elif defined(USE_SETJMP) && defined(GCC_ALTIVEC)
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	void (*handler)(int sig);
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	handler = signal(SIGILL, illegal_instruction);
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	if ( setjmp(jmpbuf) == 0 ) {
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		asm volatile ("mtspr 256, %0\n\t"
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			      "vand %%v0, %%v0, %%v0"
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			      :
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			      : "r" (-1));
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		altivec = 1;
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   268
	}
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	signal(SIGILL, handler);
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#endif
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	return altivec; 
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   272
}
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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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   285
		}
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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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   302
			SDL_CPUFeatures |= CPU_HAS_ALTIVEC;
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   303
		}
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	}
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   305
	return SDL_CPUFeatures;
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   306
}
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SDL_bool SDL_HasRDTSC()
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   309
{
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   310
	if ( SDL_GetCPUFeatures() & CPU_HAS_RDTSC ) {
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		return SDL_TRUE;
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   312
	}
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	return SDL_FALSE;
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   314
}
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   315
739
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   316
SDL_bool SDL_HasMMX()
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   317
{
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   318
	if ( SDL_GetCPUFeatures() & CPU_HAS_MMX ) {
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   319
		return SDL_TRUE;
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   320
	}
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   321
	return SDL_FALSE;
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   322
}
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   323
804
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   324
SDL_bool SDL_HasMMXExt()
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   325
{
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   326
	if ( SDL_GetCPUFeatures() & CPU_HAS_MMXEXT ) {
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   327
		return SDL_TRUE;
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   328
	}
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   329
	return SDL_FALSE;
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   330
}
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   331
739
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   332
SDL_bool SDL_Has3DNow()
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diff changeset
   333
{
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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diff changeset
   334
	if ( SDL_GetCPUFeatures() & CPU_HAS_3DNOW ) {
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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   335
		return SDL_TRUE;
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diff changeset
   336
	}
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   337
	return SDL_FALSE;
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diff changeset
   338
}
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   339
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   340
SDL_bool SDL_Has3DNowExt()
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   341
{
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   342
	if ( SDL_GetCPUFeatures() & CPU_HAS_3DNOWEXT ) {
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   343
		return SDL_TRUE;
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   344
	}
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   345
	return SDL_FALSE;
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   346
}
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   347
739
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   348
SDL_bool SDL_HasSSE()
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   349
{
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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   350
	if ( SDL_GetCPUFeatures() & CPU_HAS_SSE ) {
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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diff changeset
   351
		return SDL_TRUE;
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diff changeset
   352
	}
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diff changeset
   353
	return SDL_FALSE;
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   354
}
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   355
804
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   356
SDL_bool SDL_HasSSE2()
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   357
{
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   358
	if ( SDL_GetCPUFeatures() & CPU_HAS_SSE2 ) {
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   359
		return SDL_TRUE;
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   360
	}
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   361
	return SDL_FALSE;
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   362
}
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   363
778
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   364
SDL_bool SDL_HasAltiVec()
8ac3f46f9d09 Date: Tue, 6 Jan 2004 12:42:19 +0100
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diff changeset
   365
{
8ac3f46f9d09 Date: Tue, 6 Jan 2004 12:42:19 +0100
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diff changeset
   366
	if ( SDL_GetCPUFeatures() & CPU_HAS_ALTIVEC ) {
8ac3f46f9d09 Date: Tue, 6 Jan 2004 12:42:19 +0100
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   367
		return SDL_TRUE;
8ac3f46f9d09 Date: Tue, 6 Jan 2004 12:42:19 +0100
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diff changeset
   368
	}
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diff changeset
   369
	return SDL_FALSE;
8ac3f46f9d09 Date: Tue, 6 Jan 2004 12:42:19 +0100
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diff changeset
   370
}
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   371
739
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diff changeset
   372
#ifdef TEST_MAIN
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   373
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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diff changeset
   374
#include <stdio.h>
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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   376
int main()
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
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diff changeset
   377
{
778
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diff changeset
   378
	printf("RDTSC: %d\n", SDL_HasRDTSC());
739
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diff changeset
   379
	printf("MMX: %d\n", SDL_HasMMX());
785
ca06a994f03c Fixed bugs in CPU feature detection and added extended feature detection
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diff changeset
   380
	printf("MMXExt: %d\n", SDL_HasMMXExt());
739
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   381
	printf("3DNow: %d\n", SDL_Has3DNow());
785
ca06a994f03c Fixed bugs in CPU feature detection and added extended feature detection
Sam Lantinga <slouken@libsdl.org>
parents: 784
diff changeset
   382
	printf("3DNowExt: %d\n", SDL_Has3DNowExt());
739
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   383
	printf("SSE: %d\n", SDL_HasSSE());
785
ca06a994f03c Fixed bugs in CPU feature detection and added extended feature detection
Sam Lantinga <slouken@libsdl.org>
parents: 784
diff changeset
   384
	printf("SSE2: %d\n", SDL_HasSSE2());
778
8ac3f46f9d09 Date: Tue, 6 Jan 2004 12:42:19 +0100
Sam Lantinga <slouken@libsdl.org>
parents: 769
diff changeset
   385
	printf("AltiVec: %d\n", SDL_HasAltiVec());
745
71ee03909f42 Greatly simplified the SDL CPU info code
Sam Lantinga <slouken@libsdl.org>
parents: 739
diff changeset
   386
	return 0;
739
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   387
}
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   388
22dbf364c017 Added SDL_HasMMX(), SDL_Has3DNow(), SDL_HasSSE() in SDL_cpuinfo.h
Sam Lantinga <slouken@libsdl.org>
parents:
diff changeset
   389
#endif /* TEST_MAIN */