Subversion Repositories or1k_soc_on_altera_embedded_dev_kit

/*

 * arch/alpha/lib/strcat.S

 * Contributed by Richard Henderson (rth@tamu.edu)

 *

 * Append a null-terminated string from SRC to DST.

 */

        .text

        .align 3

        .globl strcat

        .ent strcat

strcat:

        .frame $30, 0, $26

        .prologue 0

        mov     $16, $0         # set up return value

        /* Find the end of the string.  */

        ldq_u   $1, 0($16)      # load first quadword (a0 may be misaligned)

        lda     $2, -1

        insqh   $2, $16, $2

        andnot  $16, 7, $16

        or      $2, $1, $1

        cmpbge  $31, $1, $2     # bits set iff byte == 0

        bne     $2, $found

$loop:  ldq     $1, 8($16)

        addq    $16, 8, $16

        cmpbge  $31, $1, $2

        beq     $2, $loop

$found: negq    $2, $3          # clear all but least set bit

        and     $2, $3, $2

        and     $2, 0xf0, $3    # binary search for that set bit

        and     $2, 0xcc, $4

        and     $2, 0xaa, $5

        cmovne  $3, 4, $3

        cmovne  $4, 2, $4

        cmovne  $5, 1, $5

        addq    $3, $4, $3

        addq    $16, $5, $16

        addq    $16, $3, $16

        /* Now do the append.  */

        mov     $26, $23

        br      __stxcpy

        .end strcat