cosmopolitan/libc/tinymath/log1pf.S

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/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
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"
.source __FILE__
/ Returns log(𝟷+𝑥).
/
/ @param 𝑥 is float scalar in low quarter of %xmm0
/ @return float scalar in low quarter of %xmm0
tinymath_log1pf:
push %rbp
mov %rsp,%rbp
.profilable
push %rax
vmovss %xmm0,-4(%rbp)
flds -4(%rbp)
fld %st
fabs
fldt .LC16(%rip)
fxch
fcomip %st(1),%st
fstp %st
jnb 2f
fldln2
fxch
fyl2xp1
1: fstps -4(%rbp)
vmovss -4(%rbp),%xmm0
leave
ret
2: fld1
faddp %st,%st(1)
fldln2
fxch
fyl2x
jmp 1b
.endfn tinymath_log1pf,globl
.alias tinymath_log1pf,log1pf
.rodata.cst16
.LC16: .long 205731576
.long 2515933592
.long 16381
.long 0