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/* Cpu detection code, extracted from mmx.h ((c)1997-99 by H. Dietz
and R. Fisher). Converted to C and improved by Fabrice Bellard */
#include <stdio.h>
#include <stdlib.h>
#include "ac.h"
#include <string.h>
#ifdef ARCH_X86_64
# define REG_b "rbx"
# define REG_S "rsi"
#else
# define REG_b "ebx"
# define REG_S "esi"
#endif
//exported
int mm_flag;
/* ebx saving is necessary for PIC. gcc seems unable to see it alone */
#define cpuid(index,eax,ebx,ecx,edx)\
__asm __volatile\
("mov %%"REG_b", %%"REG_S"\n\t"\
"cpuid\n\t"\
"xchg %%"REG_b", %%"REG_S\
: "=a" (eax), "=S" (ebx),\
"=c" (ecx), "=d" (edx)\
: "0" (index));
#define CPUID_STD_MMX 0x00800000
#define CPUID_STD_SSE 0x02000000
#define CPUID_STD_SSE2 0x04000000
#define CPUID_STD_SSE3 0x00000001 // ECX!
#define CPUID_EXT_AMD_3DNOW 0x80000000
#define CPUID_EXT_AMD_3DNOWEXT 0x40000000
#define CPUID_EXT_AMD_MMXEXT 0x00400000
#define CPUID_EXT_CYR_MMX 0x00800000
#define CPUID_EXT_CYR_MMXEXT 0x01000000
/* Function to test if multimedia instructions are supported... */
static int mm_support(void)
{
int rval = 0;
#if defined(ARCH_X86) || defined(ARCH_X86_64)
int eax, ebx, ecx, edx;
int max_std_level, max_ext_level, std_caps=0, std_caps2=0, ext_caps=0;
long a, c;
char vendor[13] = "UnknownVndr";
__asm__ __volatile__ (
/* See if CPUID instruction is supported ... */
/* ... Get copies of EFLAGS into eax and ecx */
"pushf\n\t"
"pop %0\n\t"
"mov %0, %1\n\t"
/* ... Toggle the ID bit in one copy and store */
/* to the EFLAGS reg */
"xor $0x200000, %0\n\t"
"push %0\n\t"
"popf\n\t"
/* ... Get the (hopefully modified) EFLAGS */
"pushf\n\t"
"pop %0\n\t"
: "=a" (a), "=c" (c)
:
: "cc"
);
if (a == c)
return 0; /* CPUID not supported */
cpuid(0, max_std_level, ebx, ecx, edx);
/* highest cpuid is 0, no standard features */
if (max_std_level == 0)
return rval;
/* save the vendor string */
*(int *)vendor = ebx;
*(int *)&vendor[4] = edx;
*(int *)&vendor[8] = ecx;
if (max_std_level >= 1){
cpuid(1, eax, ebx, std_caps2, std_caps);
if (std_caps & (1<<15))
rval |= MM_CMOVE;
if (std_caps & (1<<23))
rval |= MM_MMX;
if (std_caps & (1<<25))
rval |= MM_MMXEXT | MM_SSE;
if (std_caps & (1<<26))
rval |= MM_SSE2;
}
cpuid(0x80000000, max_ext_level, ebx, ecx, edx);
if (max_ext_level >= 0x80000001) {
cpuid(0x80000001, eax, ebx, ecx, ext_caps);
}
cpuid(0, eax, ebx, ecx, edx);
if (strcmp(vendor, "AuthenticAMD") == 0) {
/* AMD */
if (ext_caps & (1<<22))
rval |= MM_MMXEXT;
if (ext_caps & (1<<31))
rval |= MM_3DNOW;
if (ext_caps & (1<<30))
rval |= MM_3DNOWEXT;
if (std_caps2 & (1<<0))
rval |= MM_SSE3;
} else if (strcmp(vendor, "CentaurHauls") == 0) {
/* VIA C3 */
if (ext_caps & (1<<24))
rval |= MM_MMXEXT;
} else if (strcmp(vendor, "CyrixInstead") == 0) {
/* Cyrix */
if (ext_caps & (1<<24))
rval |= MM_MMXEXT;
}
#if 0
av_log(NULL, AV_LOG_DEBUG, "%s%s%s%s%s%s\n",
(rval&MM_MMX) ? "MMX ":"",
(rval&MM_MMXEXT) ? "MMX2 ":"",
(rval&MM_SSE) ? "SSE ":"",
(rval&MM_SSE2) ? "SSE2 ":"",
(rval&MM_3DNOW) ? "3DNow ":"",
(rval&MM_3DNOWEXT) ? "3DNowExt ":"");
#endif
#endif /* ARCH_X86(_64) */
return rval;
}
int ac_mmflag(void)
{
//if (mm_flag==-1) {
mm_flag = mm_support();
#ifdef ARCH_X86
mm_flag |= MM_IA32ASM;
#endif
#ifdef ARCH_X86_64
mm_flag |= MM_AMD64ASM;
#endif
//}
return(mm_flag);
}
void ac_mmtest()
{
mm_flag=-1;
int cc=ac_mmflag();
return;
printf("(%s) available multimedia extensions:", __FILE__);
if(cc & MM_SSE3) {
printf(" sse3\n");
return;
} else if(cc & MM_SSE2) {
printf(" sse2\n");
return;
} else if(cc & MM_SSE) {
printf(" sse\n");
return;
} else if(cc & MM_3DNOWEXT) {
printf(" 3dnowext\n");
return;
} else if(cc & MM_3DNOW) {
printf(" 3dnow\n");
return;
} else if(cc & MM_MMXEXT) {
printf(" mmxext\n");
return;
} else if(cc & MM_MMX) {
printf(" mmx\n");
return;
} else if(cc & MM_AMD64ASM) {
printf(" 64asm\n");
return;
} else if(cc & MM_IA32ASM) {
printf(" 32asm\n");
return;
} else printf(" C\n");
}
/*
* Appends src to string dst of size siz (unlike strncat, siz is the
* full size of dst, not space left). At most siz-1 characters
* will be copied. Always NUL terminates (unless siz <= strlen(dst)).
* Returns strlen(src) + MIN(siz, strlen(initial dst)).
* If retval >= siz, truncation occurred.
*/
size_t
strlcat(char *dst, const char *src, size_t siz)
{
char *d = dst;
const char *s = src;
size_t n = siz;
size_t dlen;
/* Find the end of dst and adjust bytes left but don't go past end */
while (n-- != 0 && *d != '\0')
d++;
dlen = d - dst;
n = siz - dlen;
if (n == 0)
return(dlen + strlen(s));
while (*s != '\0') {
if (n != 1) {
*d++ = *s;
n--;
}
s++;
}
*d = '\0';
return(dlen + (s - src)); /* count does not include NUL */
}
char *ac_mmstr(int flag, int mode)
{
static char mmstr[64]="";
int cc;
if(flag==-1)
//get full mm caps
cc=ac_mmflag();
else
cc=flag;
//return max supported mm extensions, or str for user provided flag
if(mode==0) {
if(cc & MM_SSE3) {
return("sse3");
} else if(cc & MM_SSE2) {
return("sse2");
} else if(cc & MM_SSE) {
return("sse");
} else if(cc & MM_3DNOWEXT) {
return("3dnowext");
} else if(cc & MM_3DNOW) {
return("3dnow");
} else if(cc & MM_MMXEXT) {
return("mmxext");
} else if(cc & MM_MMX) {
return("mmx");
} else if(cc & (MM_AMD64ASM|MM_IA32ASM)) {
return("asm");
} else return("C");
}
//return full capability list
if(mode==1) {
if(cc & MM_SSE3) strlcat(mmstr, "sse3 ", sizeof(mmstr));
if(cc & MM_SSE2) strlcat(mmstr, "sse2 ", sizeof(mmstr));
if(cc & MM_SSE) strlcat(mmstr, "sse ", sizeof(mmstr));
if(cc & MM_3DNOWEXT) strlcat(mmstr, "3dnowext ", sizeof(mmstr));
if(cc & MM_3DNOW) strlcat(mmstr, "3dnow ", sizeof(mmstr));
if(cc & MM_MMXEXT) strlcat(mmstr, "mmxext ", sizeof(mmstr));
if(cc & MM_MMX) strlcat(mmstr, "mmx ", sizeof(mmstr));
if(cc & (MM_AMD64ASM|MM_IA32ASM)) strlcat(mmstr, "asm ", sizeof(mmstr));
strlcat(mmstr, "C", sizeof(mmstr));
return(mmstr);
}
return("");
}
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