andre/cosmopolitan
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

Initial import

Browse Source
This commit is contained in:
Justine Tunney
2020-06-15 07:18:57 -07:00
commit c91b3c5006
14915 changed files with 590219 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

38
libc/bits/bcdadd.S Normal file
View File

@@ -0,0 +1,38 @@
/*-*- 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"
/ Performs addition on binary-coded decimals.
bcdadd: .leafprologue
.profilable
lea 0x6666666(%rdi),%ecx
xor %esi,%ecx
lea (%rdi,%rsi),%eax
add $0x6666666,%eax
xor %eax,%ecx
not %ecx
and $0x11111110,%ecx
mov %ecx,%edx
shr $2,%edx
shr $3,%ecx
orl %edx,%ecx
sub %ecx,%eax
.leafepilogue
.endfn bcdadd,globl