55 lines
2.5 KiB
ArmAsm
55 lines
2.5 KiB
ArmAsm
/*-*- mode:unix-assembly; 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"
|
||
.source __FILE__
|
||
|
||
/ Returns arc sine of 𝑥.
|
||
/
|
||
/ @param 𝑥 is an 80-bit long double passed on stack in 16-bytes
|
||
/ @return result of computation on FPU stack in %st
|
||
/ @define atan2(𝑥,sqrt((1-𝑥)*(1+𝑥)))
|
||
/ @domain -1 ≤ 𝑥 ≤ 1
|
||
/ @mode long,legacy
|
||
tinymath_asinl:
|
||
push %rbp
|
||
mov %rsp,%rbp
|
||
.profilable
|
||
fldl 16(%rbp)
|
||
fld %st
|
||
#ifdef __FAST_MATH__
|
||
fmul %st(1),%st
|
||
fsubrs .Lone(%rip)
|
||
#else
|
||
fld1
|
||
fsubp
|
||
fld1
|
||
fadd %st(2)
|
||
fmulp
|
||
#endif
|
||
fsqrt
|
||
fpatan
|
||
pop %rbp
|
||
ret
|
||
.endfn tinymath_asinl,globl
|
||
.alias tinymath_asinl,asinl
|
||
|
||
.rodata.cst4
|
||
.Lone: .float 1.0
|