2020-06-15 14:18:57 +00:00
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/*-*- mode:asm; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
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│vi: set et ft=asm ts=8 sw=8 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/macros.h"
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2020-06-16 02:01:28 +00:00
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.source __FILE__
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2020-06-15 14:18:57 +00:00
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/ Returns arc cosine of 𝑥.
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/
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/ @param 𝑥 is an 80-bit long double passed on stack in 16-bytes
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/ @return result of computation on FPU stack in %st
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/ @define atan2(abs(sqrt((1-𝑥)*(1+𝑥))),𝑥)
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/ @domain -1 ≤ 𝑥 ≤ 1
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/ @mode long,legacy
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tinymath_acosl:
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push %rbp
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mov %rsp,%rbp
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.profilable
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fldl 16(%rbp)
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fld %st
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#ifdef __FAST_MATH__
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fmul %st(1),%st
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fsubrs .Lone(%rip)
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fsqrt
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#else
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fld1
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fsubp
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fld1
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fadd %st(2)
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fmulp
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fsqrt
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fabs # needed in downward rounding mode
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#endif
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fxch %st(1)
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fpatan
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pop %rbp
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ret
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.endfn tinymath_acosl,globl
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.alias tinymath_acosl,acosl
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.rodata.cst4
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.Lone: .float 1.0
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