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Justine Tunney
2020-06-15 07:18:57 -07:00
commit c91b3c5006
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libc/bits/bcxcpy.S Normal file
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/*-*- mode:asm; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
│vi: set et ft=asm ts=8 sw=8 fenc=utf-8 :vi│
╞══════════════════════════════════════════════════════════════════════════════╡
│ Copyright 2020 Justine Alexandra Roberts Tunney │
│ │
│ This program is free software; you can redistribute it and/or modify │
│ it under the terms of the GNU General Public License as published by │
│ the Free Software Foundation; version 2 of the License. │
│ │
│ This program 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 │
│ General Public License for more details. │
│ │
│ You should have received a copy of the GNU General Public License │
│ along with this program; if not, write to the Free Software │
│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
│ 02110-1301 USA │
╚─────────────────────────────────────────────────────────────────────────────*/
#include "libc/macros.h"
bcxcpy: push %rbp
mov %rsp,%rbp
.profilable
push %rbx
xor %ebx,%ebx
lea -64(%rbp),%rdx
sub $24,%rsp
3: lea (,%rbx,4),%ecx
mov %rsi,%rax
shr %cl,%rax
and $15,%eax
cmp $9,%eax
lea 7(%rax),%ecx
cmova %ecx,%eax
add $48,%eax
mov %al,(%rdx,%rbx)
add $1,%rbx
cmp $16,%rbx
jne 3b
mov %rdx,%rax
lea -48(%rbp),%rcx
lea 15(%rdi),%rdx
4: movzbl (%rax),%ebx
add $1,%rax
sub $1,%rdx
mov %bl,1(%rdx)
cmp %rcx,%rax
jne 4b
add $24,%rsp
pop %rbx
pop %rbp
ret
.endfn bcxcpy,globl