55 lines
2.4 KiB
ArmAsm
55 lines
2.4 KiB
ArmAsm
/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
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│vi: set et ft=asm ts=8 sw=8 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/macros.h"
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bcxcpy: push %rbp
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mov %rsp,%rbp
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.profilable
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push %rbx
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xor %ebx,%ebx
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lea -64(%rbp),%rdx
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sub $24,%rsp
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3: lea (,%rbx,4),%ecx
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mov %rsi,%rax
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shr %cl,%rax
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and $15,%eax
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cmp $9,%eax
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lea 7(%rax),%ecx
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cmova %ecx,%eax
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add $48,%eax
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mov %al,(%rdx,%rbx)
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add $1,%rbx
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cmp $16,%rbx
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jne 3b
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mov %rdx,%rax
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lea -48(%rbp),%rcx
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lea 15(%rdi),%rdx
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4: movzbl (%rax),%ebx
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add $1,%rax
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sub $1,%rdx
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mov %bl,1(%rdx)
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cmp %rcx,%rax
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jne 4b
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add $24,%rsp
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pop %rbx
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pop %rbp
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ret
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.endfn bcxcpy,globl
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