41 lines
2.2 KiB
ArmAsm
41 lines
2.2 KiB
ArmAsm
/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
|
||
│vi: set et ft=asm ts=8 tw=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"
|
||
|
||
/ Returns 𝑥 % 10,000.
|
||
/
|
||
/ @param rdi int64 𝑥
|
||
/ @return rax has remainder
|
||
rem10000int64:
|
||
mov %rdi,%rax
|
||
movabsq $0x346dc5d63886594b,%rdx
|
||
imulq %rdx
|
||
mov %rdx,%rax
|
||
mov %rdi,%rdx
|
||
sar $11,%rax
|
||
sar $63,%rdx
|
||
sub %rdx,%rax
|
||
imulq $10000,%rax,%rax
|
||
sub %rax,%rdi
|
||
mov %rdi,%rax
|
||
ret
|
||
.endfn rem10000int64,globl
|
||
.source __FILE__
|