Include dependency graph for cpu.c:

Functions
unsigned	vlc_CPU_raw (void)
	Determines the CPU capabilities.
unsigned	vlc_CPU (void)
	Retrieves CPU capability flags.
void	vlc_CPU_set (unsigned mask)
	Masks CPU capability flags.
void	vlc_CPU_dump (vlc_object_t *obj)
void	vlc_CPU_functions_init (const char capability, void restrict funcs)
	Initialises DSP functions.

Variables
static atomic_uint	cpu_flags = -1U

Function Documentation

◆ vlc_CPU()

unsigned vlc_CPU ( void )

Retrieves CPU capability flags.

References cpu_flags, unlikely, and vlc_CPU_raw().

◆ vlc_CPU_dump()

void vlc_CPU_dump ( vlc_object_t * obj )

References msg_Dbg, vlc_memstream::stream, vlc_memstream_close(), vlc_memstream_open(), and vlc_memstream_puts().

Referenced by libvlc_InternalInit().

◆ vlc_CPU_functions_init()

void vlc_CPU_functions_init	(	const char *	name,
		void *restrict	funcs )

Initialises DSP functions.

This helper looks for accelerated Digital Signal Processing functions identified by the supplied type name. Those functions ares typically implemented using architecture-specific assembler code with Single Instruction Multiple Data (SIMD) opcodes for faster processing.

The exact purposes and semantics of the DSP functions is uniquely identified by a nul-terminated string.

Note: This function should not be used directly. It is recommended to use the convenience wrapper vlc_CPU_functions_init_once() instead.

Parameters

	name	nul-terminated type identifier (cannot be NULL)
[in,out]	funcs	type-specific data structure to be initialised

References init, likely, vlc_module_map(), and vlc_module_match().

Referenced by vlc_CPU_functions_init_once().

◆ vlc_CPU_raw()

unsigned vlc_CPU_raw ( void )

Determines the CPU capabilities.

Computes CPU capability flags.

References VLC_WEAK.

Referenced by vlc_CPU(), and vlc_CPU_set().

◆ vlc_CPU_set()

void vlc_CPU_set ( unsigned mask )

Masks CPU capability flags.

This overrides the cached CPU capability flags with the intersection of the actually-detected CPU capabilities and the supplied mask. Bits cannot be added, only cleared: masking never reports a capability that hardware doesn't actually have.

This is intended for testing purposes only (e.g. checkasm), to force code paths for lesser CPU capabilities to be exercised.

Warning: This function is not thread-safe with respect to vlc_CPU(): it must be called before any thread makes its first call to vlc_CPU(), otherwise the lazy initialisation in vlc_CPU() may race with and overwrite the masked value.

References cpu_flags, and vlc_CPU_raw().

Variable Documentation

◆ cpu_flags

atomic_uint cpu_flags = -1U

static