49 lines
2.3 KiB
ArmAsm
49 lines
2.3 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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/ Converts integer to binary-coded decimal.
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i2bcd: .leafprologue
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.profilable
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test %rdi,%rdi
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je 2f
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mov %rdi,%rsi
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xor %r9d,%r9d
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mov $0xcccccccccccccccd,%r8
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xor %ecx,%ecx
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1: mov %rsi,%rax
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mul %r8
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shr $3,%rdx
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lea (%rdx,%rdx),%rax
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lea (%rax,%rax,4),%rax
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mov %rsi,%rdi
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sub %rax,%rdi
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shl %cl,%rdi
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add %rdi,%r9
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add $4,%rcx
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cmp $9,%rsi
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mov %rdx,%rsi
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ja 1b
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jmp 3f
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2: xor %r9d,%r9d
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3: mov %r9,%rax
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.leafepilogue
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.endfn i2bcd,globl
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