string.h File Reference

Optimised string operations. More...

Go to the source code of this file.

Functions
	FILE_LICENCE (GPL2_OR_LATER_OR_UBDL)
void *	__memcpy (void *dest, const void *src, size_t len)
void *	__memcpy_reverse (void *dest, const void *src, size_t len)
static	__attribute__ ((always_inline)) void *__constant_memcpy(void *dest
	Copy memory area (where length is a compile-time constant) More...
union {
uint32_t   u32 [2]
uint16_t   u16 [4]
uint8_t   u8 [8]
}	__attribute__ ((__may_alias__)) *src_u
	switch (len)
	if (len >=26) return __memcpy(dest
	if (__builtin_constant_p(offset))
__asm__	__volatile__ ("rep stosb" :"=&D"(discard_D), "=&c"(discard_c) :"0"(dest), "1"(len), "a"(fill) :"memory")

Variables
static const void *	src
static const void size_t	len
const void *	esi = src
void *	edi = dest
if(len >=6 *4) __asm__ __volatile__("movsl" if(len >=5 *4) __asm__ __volatile__("movsl" if(len >=4 *4) __asm__ __volatile__("movsl" if(len >=3 *4) __asm__ __volatile__("movsl" if(len >=2 *4) __asm__ __volatile__("movsl" if(len >=1 *4) __asm__ __volatile__("movsl" if((len % 4) >=2) __asm__ __volatile__("movsw" if((len % 2) >=1) __asm__ __volatile__("movsb" return	dest
	else
static int	fill
size_t	discard_c
uint32_t	eax = 0

Detailed Description

Optimised string operations.

Definition in file string.h.

Function Documentation

FILE_LICENCE()

FILE_LICENCE

(

GPL2_OR_LATER_OR_UBDL

)

__memcpy()

void* __memcpy	(	void *	dest,
		const void *	src,
		size_t	len
	)

Referenced by __memmove().

__memcpy_reverse()

void* __memcpy_reverse	(	void *	dest,
		const void *	src,
		size_t	len
	)

Referenced by __memmove(), and if().

__attribute__() [1/2]

static __attribute__ ( (always_inline)  )

inlinestatic

Copy memory area (where length is a compile-time constant)

Fill memory region with zero (where length is a compile-time constant)

Fill memory region.

Copy (possibly overlapping) memory area.

Copy memory area.

Parameters

dest	Destination address
src	Source address
len	Length

Return values

dest	Destination address

Parameters

dest	Destination address
fill	Fill pattern
len	Length

Return values

dest	Destination address

Parameters

dest	Destination address
len	Length

Return values

dest	Destination address

__attribute__() [2/2]

const union @610 __attribute__

(

(__may_alias__)

)

switch()

switch

(

len

)

Definition at line 61 of file string.h.

                       {
        case 0 : /* 0 bytes */
                return dest;
        /*
         * Single-register moves; these are always better than a
         * string operation.  We can clobber an arbitrary two
         * registers (data, source, dest can re-use source register)
         * instead of being restricted to esi and edi.  There's also a
         * much greater potential for optimising with nearby code.
         *
         */
        case 1 : /* 4 bytes */
                dest_u->u8[0]  = src_u->u8[0];
                return dest;
        case 2 : /* 6 bytes */
                dest_u->u16[0] = src_u->u16[0];
                return dest;
        case 4 : /* 4 bytes */
                dest_u->u32[0] = src_u->u32[0];
                return dest;
        /*
         * Double-register moves; these are probably still a win.
         *
         */
        case 3 : /* 12 bytes */
                dest_u->u16[0] = src_u->u16[0];
                dest_u->u8[2]  = src_u->u8[2];
                return dest;
        case 5 : /* 10 bytes */
                dest_u->u32[0] = src_u->u32[0];
                dest_u->u8[4]  = src_u->u8[4];
                return dest;
        case 6 : /* 12 bytes */
                dest_u->u32[0] = src_u->u32[0];
                dest_u->u16[2] = src_u->u16[2];
                return dest;
        case 8 : /* 10 bytes */
                dest_u->u32[0] = src_u->u32[0];
                dest_u->u32[1] = src_u->u32[1];
                return dest;
        }

References dest.

Referenced by bnxt_hwrm_port_phy_cfg().

if() [1/2]

if

(

len >=

26

)

if() [2/2]

if

(

__builtin_constant_p(offset)

)

Definition at line 188 of file string.h.

                                               {
                if ( offset <= 0 ) {
                        return memcpy ( dest, src, len );
                } else {
                        return __memcpy_reverse ( dest, src, len );
                }
        } else {

References __memcpy_reverse(), dest, len, memcpy(), offset, and src.

__volatile__()

__asm__ __volatile__

(

)

Variable Documentation

src

const void* src

Definition at line 47 of file string.h.

Referenced by if().

len

len

Initial value:

{
        union {
                uint32_t u32[2];
                uint16_t u16[4];
                uint8_t  u8[8];
        } __attribute__ (( __may_alias__ )) *dest_u = dest

Definition at line 47 of file string.h.

Referenced by if().

u32

uint32_t u32[2]

Definition at line 54 of file string.h.

u16

uint16_t u16[4]

Definition at line 55 of file string.h.

u8

uint8_t u8[8]

Definition at line 56 of file string.h.

esi

esi = src

Definition at line 58 of file string.h.

Referenced by __attribute__().

edi

void * edi = dest

Definition at line 59 of file string.h.

Referenced by __attribute__().

dest

if ( len >= 6*4 ) __asm__ __volatile__ ( "stosl" if ( len >= 5*4 ) __asm__ __volatile__ ( "stosl" if ( len >= 4*4 ) __asm__ __volatile__ ( "stosl" if ( len >= 3*4 ) __asm__ __volatile__ ( "stosl" if ( len >= 2*4 ) __asm__ __volatile__ ( "stosl" if ( len >= 1*4 ) __asm__ __volatile__ ( "stosl" if ( ( len % 4 ) >= 2 ) __asm__ __volatile__ ( "stosw" if ( ( len % 2 ) >= 1 ) __asm__ __volatile__ ( "stosb" return dest

Definition at line 150 of file string.h.

Referenced by if(), and switch().

else

else

Initial value:

{
                return __memmove ( dest, src, len )

Definition at line 194 of file string.h.

fill

int fill

Definition at line 208 of file string.h.

discard_c

size_t discard_c

Definition at line 210 of file string.h.

eax

eax = 0

Definition at line 234 of file string.h.

Referenced by com32_cfarcall().