2020-06-16 13:38:43 +00:00
|
|
|
|
/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
|
2020-06-15 14:18:57 +00:00
|
|
|
|
│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"
|
2020-06-16 02:01:28 +00:00
|
|
|
|
.source __FILE__
|
2020-06-15 14:18:57 +00:00
|
|
|
|
|
|
|
|
|
|
/ Calculates log₂𝑥.
|
|
|
|
|
|
/
|
|
|
|
|
|
/ @param 𝑥 is a double passed in the lower quadword of %xmm0
|
|
|
|
|
|
/ @return result in lower quadword of %xmm0
|
2020-11-07 04:02:53 +00:00
|
|
|
|
tinymath_log2:
|
|
|
|
|
|
push %rbp
|
2020-06-15 14:18:57 +00:00
|
|
|
|
mov %rsp,%rbp
|
|
|
|
|
|
.profilable
|
|
|
|
|
|
push %rax
|
|
|
|
|
|
movsd %xmm0,-8(%rbp)
|
|
|
|
|
|
fld1
|
|
|
|
|
|
fldl -8(%rbp)
|
|
|
|
|
|
fyl2x
|
|
|
|
|
|
fstpl -8(%rbp)
|
|
|
|
|
|
movsd -8(%rbp),%xmm0
|
|
|
|
|
|
leave
|
|
|
|
|
|
ret
|
2020-11-07 04:02:53 +00:00
|
|
|
|
.endfn tinymath_log2,globl
|
|
|
|
|
|
.alias tinymath_log2,log2
|
