cputest.c
资源名称:tcpmp.rar [点击查看]
上传用户:wstnjxml
上传日期:2014-04-03
资源大小:7248k
文件大小:4k
源码类别:
Windows CE
开发平台:
C/C++
- /* 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 <stdlib.h>
- #include "../dsputil.h"
- #ifdef ARCH_X86_64
- # define REG_b "rbx"
- # define REG_S "rsi"
- #else
- # define REG_b "ebx"
- # define REG_S "esi"
- #endif
- /* 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"nt"
- "cpuidnt"
- "xchg %%"REG_b", %%"REG_S
- : "=a" (eax), "=S" (ebx),
- "=c" (ecx), "=d" (edx)
- : "0" (index));
- /* Function to test if multimedia instructions are supported... */
- int mm_support(void)
- {
- int rval = 0;
- int eax, ebx, ecx, edx;
- int max_std_level, max_ext_level, std_caps=0, ext_caps=0;
- long a, c;
- __asm__ __volatile__ (
- /* See if CPUID instruction is supported ... */
- /* ... Get copies of EFLAGS into eax and ecx */
- "pushfnt"
- "pop %0nt"
- "mov %0, %1nt"
- /* ... Toggle the ID bit in one copy and store */
- /* to the EFLAGS reg */
- "xor $0x200000, %0nt"
- "push %0nt"
- "popfnt"
- /* ... Get the (hopefully modified) EFLAGS */
- "pushfnt"
- "pop %0nt"
- : "=a" (a), "=c" (c)
- :
- : "cc"
- );
- if (a == c)
- return 0; /* CPUID not supported */
- cpuid(0, max_std_level, ebx, ecx, edx);
- if(max_std_level >= 1){
- cpuid(1, eax, ebx, ecx, std_caps);
- 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);
- if (ext_caps & (1<<31))
- rval |= MM_3DNOW;
- if (ext_caps & (1<<30))
- rval |= MM_3DNOWEXT;
- if (ext_caps & (1<<23))
- rval |= MM_MMX;
- }
- cpuid(0, eax, ebx, ecx, edx);
- if ( ebx == 0x68747541 &&
- edx == 0x69746e65 &&
- ecx == 0x444d4163) {
- /* AMD */
- if(ext_caps & (1<<22))
- rval |= MM_MMXEXT;
- } else if (ebx == 0x746e6543 &&
- edx == 0x48727561 &&
- ecx == 0x736c7561) { /* "CentaurHauls" */
- /* VIA C3 */
- if(ext_caps & (1<<24))
- rval |= MM_MMXEXT;
- } else if (ebx == 0x69727943 &&
- edx == 0x736e4978 &&
- ecx == 0x64616574) {
- /* Cyrix Section */
- /* See if extended CPUID level 80000001 is supported */
- /* The value of CPUID/80000001 for the 6x86MX is undefined
- according to the Cyrix CPU Detection Guide (Preliminary
- Rev. 1.01 table 1), so we'll check the value of eax for
- CPUID/0 to see if standard CPUID level 2 is supported.
- According to the table, the only CPU which supports level
- 2 is also the only one which supports extended CPUID levels.
- */
- if (eax < 2)
- return rval;
- if (ext_caps & (1<<24))
- rval |= MM_MMXEXT;
- }
- #if 0
- av_log(NULL, AV_LOG_DEBUG, "%s%s%s%s%s%sn",
- (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
- return rval;
- }
- #ifdef __TEST__
- int main ( void )
- {
- int mm_flags;
- mm_flags = mm_support();
- printf("mm_support = 0x%08Xn",mm_flags);
- return 0;
- }
- #endif