diff options
Diffstat (limited to 'lib/libc/ia64/string/bzero.S')
| -rw-r--r-- | lib/libc/ia64/string/bzero.S | 82 |
1 files changed, 82 insertions, 0 deletions
diff --git a/lib/libc/ia64/string/bzero.S b/lib/libc/ia64/string/bzero.S new file mode 100644 index 000000000000..1d1519e1f06a --- /dev/null +++ b/lib/libc/ia64/string/bzero.S @@ -0,0 +1,82 @@ +/*- + * Copyright (c) 2000 Doug Rabson + * All rights reserved. + * + * Redistribution and use in source and binary forms, with or without + * modification, are permitted provided that the following conditions + * are met: + * 1. Redistributions of source code must retain the above copyright + * notice, this list of conditions and the following disclaimer. + * 2. Redistributions in binary form must reproduce the above copyright + * notice, this list of conditions and the following disclaimer in the + * documentation and/or other materials provided with the distribution. + * + * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND + * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE + * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE + * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE + * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL + * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS + * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) + * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT + * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY + * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF + * SUCH DAMAGE. + * + * $FreeBSD$ + */ + +#include <machine/asm.h> + +ENTRY(bzero, 2) + + cmp.le p6,p0=in1,r0 // bail if len <= 0 +(p6) br.ret.spnt.few rp + ;; + mov r14=ar.lc // save ar.lc + + cmp.ltu p6,p0=17,in1 // check for small +(p6) br.dptk.few 3f + +1: add r15=-1,in1 ;; + mov ar.lc=r15 ;; +2: st1 [in0]=r0,1 // zero one byte + br.cloop.sptk.few 2b // loop + + ;; + mov ar.lc=r14 // done + br.ret.sptk.few rp + + // Zero up to 8byte alignment + +3: tbit.nz p6,p0=in0,0 ;; +(p6) st1 [in0]=r0,1 +(p6) add in1=-1,in1 ;; + + tbit.nz p6,p0=in0,1 ;; +(p6) st2 [in0]=r0,2 +(p6) add in1=-2,in1 ;; + + tbit.nz p6,p0=in0,2 ;; +(p6) st4 [in0]=r0,4 +(p6) add in1=-4,in1 + + ;; + shr.u r15=in1,3 // word count + extr.u in1=in1,0,3 ;; // trailing bytes + cmp.eq p6,p0=r15,r0 // check for zero + cmp.ne p7,p0=in1,r0 +(p6) br.dpnt.few 1b // zero last bytes + + add r15=-1,r15 ;; + mov ar.lc=r15 ;; +4: st8 [in0]=r0,8 + br.cloop.sptk.few 4b + +(p7) br.dpnt.few 1b // zero last bytes + + ;; + mov ar.lc=r14 // done + br.ret.sptk.few rp + +END(bzero) |