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Justine Tunney
2020-06-15 07:18:57 -07:00
commit c91b3c5006
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libc/bits/bcd2i.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"
/ Converts binary-coded-decimal to integer.
/
/ @param rdi is the string copied into a word
bcd2i: .leafprologue
.profilable
test %rdi,%rdi
je 2f
mov $1,%ecx
xor %eax,%eax
1: mov %edi,%edx
and $15,%edx
imul %rcx,%rdx
add %rdx,%rax
add %rcx,%rcx
lea (%rcx,%rcx,4),%rcx
shr $4,%rdi
jne 1b
ret
2: xor %eax,%eax
.leafepilogue
.endfn bcd2i,globl