/* Copyright (C) 1996, 2003 Free Software Foundation, Inc. This file is part of the GNU C Library. Contributed by Richard Henderson <rth@tamu.edu>, 1996. The GNU C Library is free software; you can redistribute it and/or modify it under the terms of the GNU Lesser General Public License as published by the Free Software Foundation; either version 2.1 of the License, or (at your option) any later version. The GNU C Library is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public License for more details. You should have received a copy of the GNU Lesser General Public License along with the GNU C Library; if not, write to the Free Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA. */ /* Append a null-terminated string from SRC to DST. */ #include <sysdep.h> .text ENTRY(strcat) ldgp gp, 0(pv) #ifdef PROF .set noat lda AT, _mcount jsr AT, (AT), _mcount .set at #endif .prologue 1 mov a0, v0 # set up return value /* Find the end of the string. */ ldq_u t0, 0(a0) # load first quadword (a0 may be misaligned) lda t1, -1(zero) insqh t1, a0, t1 andnot a0, 7, a0 or t1, t0, t0 cmpbge zero, t0, t1 # t1 <- bitmask: bit i == 1 <==> i-th byte == 0 bne t1, $found $loop: ldq t0, 8(a0) addq a0, 8, a0 # addr += 8 cmpbge zero, t0, t1 beq t1, $loop $found: negq t1, t2 # clear all but least set bit and t1, t2, t1 and t1, 0xf0, t2 # binary search for that set bit and t1, 0xcc, t3 and t1, 0xaa, t4 cmovne t2, 4, t2 cmovne t3, 2, t3 cmovne t4, 1, t4 addq t2, t3, t2 addq a0, t4, a0 addq a0, t2, a0 /* Now do the append. */ mov ra, t9 jmp $31, __stxcpy END(strcat) libc_hidden_builtin_def (strcat)