64 lines
2.5 KiB
ArmAsm
64 lines
2.5 KiB
ArmAsm
/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
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│vi: set et ft=asm ts=8 tw=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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.source __FILE__
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/ Returns log(𝟷+𝑥).
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/
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/ @param 𝑥 is double scalar in low half of %xmm0
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/ @return double scalar in low half of %xmm0
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tinymath_log1p:
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push %rbp
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mov %rsp,%rbp
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.profilable
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push %rax
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vmovsd %xmm0,(%rsp)
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fldl (%rsp)
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fld %st
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fabs
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fldt .LC16(%rip)
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fxch
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fcomip %st(1),%st
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fstp %st
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jnb 1f
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fldln2
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fxch
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fyl2xp1
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fstpl (%rsp)
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vmovsd (%rsp),%xmm0
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0: leave
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ret
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1: fld1
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faddp %st,%st(1)
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fldln2
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fxch
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fyl2x
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fstpl (%rsp)
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vmovsd (%rsp),%xmm0
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jmp 0b
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.endfn tinymath_log1p,globl
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.alias tinymath_log1p,log1p
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.rodata.cst16
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.LC16: .long 205731576
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.long 2515933592
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.long 16381
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.long 0
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