41 lines
2.2 KiB
ArmAsm
41 lines
2.2 KiB
ArmAsm
/*-*- 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 │
|
||
│ │
|
||
│ 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. │
|
||
│ │
|
||
│ 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. │
|
||
╚─────────────────────────────────────────────────────────────────────────────*/
|
||
#include "libc/macros.h"
|
||
|
||
/ Returns log₂x exponent part of long double.
|
||
/
|
||
/ @param 𝑥 is long double passed on stack
|
||
/ @return result in %eax
|
||
/ @note needs sse3
|
||
tinymath_ilogbl:
|
||
push %rbp
|
||
mov %rsp,%rbp
|
||
.profilable
|
||
fldt 16(%rbp)
|
||
fxtract
|
||
fstp %st
|
||
push %rax
|
||
fisttpl (%rsp)
|
||
mov (%rsp),%eax
|
||
leave
|
||
ret
|
||
.endfn tinymath_ilogbl,globl
|
||
.alias tinymath_ilogbl,ilogbl
|
||
.source __FILE__
|