43 lines
2.3 KiB
ArmAsm
43 lines
2.3 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 │
|
||
│ │
|
||
│ 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"
|
||
|
||
/ Returns log₂x exponent part of float.
|
||
/
|
||
/ @param 𝑥 is float passed in %xmm0
|
||
/ @return result in %eax
|
||
/ @note needs sse3
|
||
tinymath_ilogbf:
|
||
push %rbp
|
||
mov %rsp,%rbp
|
||
.profilable
|
||
push %rax
|
||
movss %xmm0,(%rsp)
|
||
flds (%rsp)
|
||
fxtract
|
||
fstp %st
|
||
fisttpl (%rsp)
|
||
mov (%rsp),%eax
|
||
leave
|
||
ret
|
||
.endfn tinymath_ilogbf,globl
|
||
.alias tinymath_ilogbf,ilogbf
|
||
.source __FILE__
|