1/* 2 * arch/alpha/lib/strcat.S 3 * Contributed by Richard Henderson (rth@tamu.edu) 4 * 5 * Append a null-terminated string from SRC to DST. 6 */ 7#include <asm/export.h> 8 9 .text 10 11 .align 3 12 .globl strcat 13 .ent strcat 14strcat: 15 .frame $30, 0, $26 16 .prologue 0 17 18 mov $16, $0 # set up return value 19 20 /* Find the end of the string. */ 21 22 ldq_u $1, 0($16) # load first quadword (a0 may be misaligned) 23 lda $2, -1 24 insqh $2, $16, $2 25 andnot $16, 7, $16 26 or $2, $1, $1 27 cmpbge $31, $1, $2 # bits set iff byte == 0 28 bne $2, $found 29 30$loop: ldq $1, 8($16) 31 addq $16, 8, $16 32 cmpbge $31, $1, $2 33 beq $2, $loop 34 35$found: negq $2, $3 # clear all but least set bit 36 and $2, $3, $2 37 38 and $2, 0xf0, $3 # binary search for that set bit 39 and $2, 0xcc, $4 40 and $2, 0xaa, $5 41 cmovne $3, 4, $3 42 cmovne $4, 2, $4 43 cmovne $5, 1, $5 44 addq $3, $4, $3 45 addq $16, $5, $16 46 addq $16, $3, $16 47 48 /* Now do the append. */ 49 50 mov $26, $23 51 br __stxcpy 52 53 .end strcat 54EXPORT_SYMBOL(strcat); 55