Commit d4c55a87 authored by Sam Hocevar's avatar Sam Hocevar
Browse files

   * Altivec instructions autodetection.
parent 81bafafa
......@@ -32,112 +32,8 @@
/*****************************************************************************
* TestVersion: tests if the given string equals the current version
*****************************************************************************/
int TestVersion( char * psz_version );
int TestProgram( char * psz_program );
int TestMethod( char * psz_var, char * psz_method );
int TestCPU( int i_capabilities );
/*****************************************************************************
* CPUCapabilities: list the processors MMX support and other capabilities
*****************************************************************************
* This function is called to list extensions the CPU may have.
*****************************************************************************/
static __inline__ int CPUCapabilities( void )
{
#ifdef SYS_BEOS
return( CPU_CAPABILITY_NONE
| CPU_CAPABILITY_486
| CPU_CAPABILITY_586
| CPU_CAPABILITY_MMX );
#else
int i_capabilities = CPU_CAPABILITY_NONE;
#ifdef __i386__
unsigned int i_eax, i_ebx, i_ecx, i_edx;
boolean_t b_amd;
#define cpuid( a ) \
asm volatile ( "cpuid" \
: "=a" ( i_eax ), \
"=b" ( i_ebx ), \
"=c" ( i_ecx ), \
"=d" ( i_edx ) \
: "a" ( a ) \
: "cc" ); \
/* test for a 486 CPU */
asm volatile ( "pushfl
popl %%eax
movl %%eax, %%ebx
xorl $0x200000, %%eax
pushl %%eax
popfl
pushfl
popl %%eax"
: "=a" ( i_eax ),
"=b" ( i_ebx )
:
: "cc" );
if( i_eax == i_ebx )
{
return( i_capabilities );
}
i_capabilities |= CPU_CAPABILITY_486;
/* the CPU supports the CPUID instruction - get its level */
cpuid( 0x00000000 );
if( !i_eax )
{
return( i_capabilities );
}
/* FIXME: this isn't correct, since some 486s have cpuid */
i_capabilities |= CPU_CAPABILITY_586;
/* borrowed from mpeg2dec */
b_amd = ( i_ebx == 0x68747541 ) && ( i_ecx == 0x444d4163 )
&& ( i_edx == 0x69746e65 );
/* test for the MMX flag */
cpuid( 0x00000001 );
if( ! (i_edx & 0x00800000) )
{
return( i_capabilities );
}
i_capabilities |= CPU_CAPABILITY_MMX;
if( i_edx & 0x02000000 )
{
i_capabilities |= CPU_CAPABILITY_MMXEXT;
}
/* test for additional capabilities */
cpuid( 0x80000000 );
if( i_eax < 0x80000001 )
{
return( i_capabilities );
}
/* list these additional capabilities */
cpuid( 0x80000001 );
if( i_edx & 0x80000000 )
{
i_capabilities |= CPU_CAPABILITY_3DNOW;
}
if( b_amd && ( i_edx & 0x00400000 ) )
{
i_capabilities |= CPU_CAPABILITY_MMXEXT;
}
#endif /* __i386__ */
return( i_capabilities );
#endif /* SYS_BEOS */
}
int TestVersion ( char * psz_version );
int TestProgram ( char * psz_program );
int TestMethod ( char * psz_var, char * psz_method );
int TestCPU ( int i_capabilities );
......@@ -34,6 +34,10 @@
#include <getopt.h> /* getopt() */
#endif
#ifdef SYS_DARWIN1_3
#include <Carbon/Carbon.h> /* Altivec detection */
#endif
#include <unistd.h>
#include <errno.h> /* ENOMEM */
#include <stdlib.h> /* getenv(), strtol(), */
......@@ -180,6 +184,8 @@ static void InitSignalHandler ( void );
static void SimpleSignalHandler ( int i_signal );
static void FatalSignalHandler ( int i_signal );
static int CPUCapabilities ( void );
/*****************************************************************************
* main: parse command line, start interface and spawn threads
*****************************************************************************
......@@ -878,3 +884,121 @@ static void FatalSignalHandler( int i_signal )
p_main->p_intf->b_die = 1;
}
/*****************************************************************************
* CPUCapabilities: list the processors MMX support and other capabilities
*****************************************************************************
* This function is called to list extensions the CPU may have.
*****************************************************************************/
static int CPUCapabilities( void )
{
int i_capabilities = CPU_CAPABILITY_NONE;
#if defined( SYS_BEOS )
i_capabilities |= CPU_CAPABILITY_486
| CPU_CAPABILITY_586
| CPU_CAPABILITY_MMX;
#elif defined( SYS_DARWIN1_3 )
OSErr err;
long l_attributes = 0;
err = Gestalt( gestaltPowerPCProcessorFeatures, &l_attributes );
if( err == noErr &&
( (1 << gestaltPowerPCHasVectorInstructions) & l_attributes ) )
{
i_capabilities |= CPU_CAPABILITY_ALTIVEC;
}
#elif defined( __i386__ )
unsigned int i_eax, i_ebx, i_ecx, i_edx;
boolean_t b_amd;
# define cpuid( a ) \
asm volatile ( "cpuid" \
: "=a" ( i_eax ), \
"=b" ( i_ebx ), \
"=c" ( i_ecx ), \
"=d" ( i_edx ) \
: "a" ( a ) \
: "cc" ); \
/* test for a 486 CPU */
asm volatile ( "pushfl
popl %%eax
movl %%eax, %%ebx
xorl $0x200000, %%eax
pushl %%eax
popfl
pushfl
popl %%eax"
: "=a" ( i_eax ),
"=b" ( i_ebx )
:
: "cc" );
if( i_eax == i_ebx )
{
return( i_capabilities );
}
i_capabilities |= CPU_CAPABILITY_486;
/* the CPU supports the CPUID instruction - get its level */
cpuid( 0x00000000 );
if( !i_eax )
{
return( i_capabilities );
}
/* FIXME: this isn't correct, since some 486s have cpuid */
i_capabilities |= CPU_CAPABILITY_586;
/* borrowed from mpeg2dec */
b_amd = ( i_ebx == 0x68747541 ) && ( i_ecx == 0x444d4163 )
&& ( i_edx == 0x69746e65 );
/* test for the MMX flag */
cpuid( 0x00000001 );
if( ! (i_edx & 0x00800000) )
{
return( i_capabilities );
}
i_capabilities |= CPU_CAPABILITY_MMX;
if( i_edx & 0x02000000 )
{
i_capabilities |= CPU_CAPABILITY_MMXEXT;
}
/* test for additional capabilities */
cpuid( 0x80000000 );
if( i_eax < 0x80000001 )
{
return( i_capabilities );
}
/* list these additional capabilities */
cpuid( 0x80000001 );
if( i_edx & 0x80000000 )
{
i_capabilities |= CPU_CAPABILITY_3DNOW;
}
if( b_amd && ( i_edx & 0x00400000 ) )
{
i_capabilities |= CPU_CAPABILITY_MMXEXT;
}
#else
/* default behaviour */
#endif
return( i_capabilities );
}
Markdown is supported
0% or .
You are about to add 0 people to the discussion. Proceed with caution.
Finish editing this message first!
Please register or to comment