: "a" ( reg ) \
: "cc" );
# endif
+ /* Check if the OS really supports the requested instructions */
+# define check_capability(name, flag, code) \
+ do { \
+ pid_t pid = fork(); \
+ if( pid == 0 ) \
+ { \
+ __asm__ __volatile__ ( code : : ); \
+ exit(0); \
+ } \
+ if( check_OS_capability((name), pid )) \
+ i_capabilities |= (flag); \
+ while(0)
# if defined (__i386__) && !defined (__i486__) && !defined (__i586__) \
&& !defined (__i686__) && !defined (__pentium4__) \
i_capabilities |= CPU_CAPABILITY_MMXEXT;
# ifdef CAN_COMPILE_SSE
- /* We test if OS supports the SSE instructions */
- pid_t pid = fork();
- if( pid == 0 )
- {
- /* Test a SSE instruction */
- __asm__ __volatile__ ( "xorps %%xmm0,%%xmm0\n" : : );
- exit(0);
- }
- if( check_OS_capability( "SSE", pid ) )
- i_capabilities |= CPU_CAPABILITY_SSE;
+ check_capability( "SSE", CPU_CAPABILITY_SSE,
+ "xorps %%xmm0,%%xmm0\n" );
# endif
}
# endif
i_capabilities |= CPU_CAPABILITY_SSE2;
# elif defined (CAN_COMPILE_SSE)
if( i_edx & 0x04000000 )
- {
- /* We test if OS supports the SSE2 instructions */
- pid_t pid = fork();
- if( pid == 0 )
- {
- /* Test a SSE2 instruction */
- __asm__ __volatile__ ( "movupd %%xmm0, %%xmm0\n" : : );
- exit(0);
- }
- if( check_OS_capability( "SSE2", pid ) )
- i_capabilities |= CPU_CAPABILITY_SSE2;
- }
+ check_capability( "SSE2", CPU_CAPABILITY_SSE2,
+ "movupd %%xmm0, %%xmm0\n" );
# endif
# if defined (__SSE3__)
i_capabilities |= CPU_CAPABILITY_SSE3;
# elif defined (CAN_COMPILE_SSE3)
if( i_ecx & 0x00000001 )
- {
- /* We test if OS supports the SSE3 instructions */
- pid_t pid = fork();
- if( pid == 0 )
- {
- /* Test a SSE3 instruction */
- __asm__ __volatile__ ( "movsldup %%xmm1, %%xmm0\n" : : );
- exit(0);
- }
- if( check_OS_capability( "SSE3", pid ) )
- i_capabilities |= CPU_CAPABILITY_SSE3;
- }
+ check_capability( "SSE3", CPU_CAPABILITY_SSE3,
+ "movsldup %%xmm1, %%xmm0\n" );
# endif
/* test for additional capabilities */
i_capabilities |= CPU_CAPABILITY_3DNOW;
# elif defined (CAN_COMPILE_3DNOW)
if( i_edx & 0x80000000 )
- {
- pid_t pid = fork();
- if( pid == 0 )
- {
- /* Test a 3D Now! instruction */
- __asm__ __volatile__ ( "pfadd %%mm0,%%mm0\n" "femms\n" : : );
- exit(0);
- }
- if( check_OS_capability( "3D Now!", pid ) )
- i_capabilities |= CPU_CAPABILITY_3DNOW;
- }
+ check_capability( "3D Now!", CPU_CAPABILITY_3DNOW,
+ "pfadd %%mm0,%%mm0\n" "femms\n" );
# endif
if( b_amd && ( i_edx & 0x00400000 ) )