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 sw=8 fenc=utf-8 :vi│
|
|
|
|
|
|
╞══════════════════════════════════════════════════════════════════════════════╡
|
|
|
|
|
|
│ Copyright 2020 Justine Alexandra Roberts Tunney │
|
|
|
|
|
|
│ │
|
2020-12-28 01:18:44 +00:00
|
|
|
|
│ Permission to use, copy, modify, and/or distribute this software for │
|
|
|
|
|
|
│ any purpose with or without fee is hereby granted, provided that the │
|
|
|
|
|
|
│ above copyright notice and this permission notice appear in all copies. │
|
2020-06-15 14:18:57 +00:00
|
|
|
|
│ │
|
2020-12-28 01:18:44 +00:00
|
|
|
|
│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
|
|
|
|
|
|
│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
|
|
|
|
|
|
│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
|
|
|
|
|
|
│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
|
|
|
|
|
|
│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
|
|
|
|
|
|
│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
|
|
|
|
|
|
│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
|
|
|
|
|
|
│ PERFORMANCE OF THIS SOFTWARE. │
|
2020-06-15 14:18:57 +00:00
|
|
|
|
╚─────────────────────────────────────────────────────────────────────────────*/
|
|
|
|
|
|
#include "libc/macros.h"
|
2020-06-16 02:01:28 +00:00
|
|
|
|
.source __FILE__
|
2020-06-15 14:18:57 +00:00
|
|
|
|
|
|
|
|
|
|
/ Returns arc cosine 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(abs(sqrt((1-𝑥)*(1+𝑥))),𝑥)
|
|
|
|
|
|
/ @domain -1 ≤ 𝑥 ≤ 1
|
|
|
|
|
|
/ @mode long,legacy
|
|
|
|
|
|
tinymath_acosl:
|
|
|
|
|
|
push %rbp
|
|
|
|
|
|
mov %rsp,%rbp
|
|
|
|
|
|
.profilable
|
|
|
|
|
|
fldl 16(%rbp)
|
|
|
|
|
|
fld %st
|
|
|
|
|
|
#ifdef __FAST_MATH__
|
|
|
|
|
|
fmul %st(1),%st
|
|
|
|
|
|
fsubrs .Lone(%rip)
|
|
|
|
|
|
fsqrt
|
|
|
|
|
|
#else
|
|
|
|
|
|
fld1
|
|
|
|
|
|
fsubp
|
|
|
|
|
|
fld1
|
|
|
|
|
|
fadd %st(2)
|
|
|
|
|
|
fmulp
|
|
|
|
|
|
fsqrt
|
|
|
|
|
|
fabs # needed in downward rounding mode
|
|
|
|
|
|
#endif
|
2020-08-31 12:17:31 +00:00
|
|
|
|
fxch
|
2020-06-15 14:18:57 +00:00
|
|
|
|
fpatan
|
|
|
|
|
|
pop %rbp
|
|
|
|
|
|
ret
|
|
|
|
|
|
.endfn tinymath_acosl,globl
|
|
|
|
|
|
.alias tinymath_acosl,acosl
|
|
|
|
|
|
|
|
|
|
|
|
.rodata.cst4
|
|
|
|
|
|
.Lone: .float 1.0
|
