54 lines
2.5 KiB
ArmAsm
54 lines
2.5 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 "ape/lib/pc.h"
|
||
#include "libc/macros.h"
|
||
|
||
/ Rounds to nearest integer, away from zero.
|
||
/
|
||
/ @param 𝑥 is an 80-bit long double passed on stack in 16-bytes
|
||
/ @return result of exponentiation on FPU stack in %st
|
||
tinymath_roundl:
|
||
push %rbp
|
||
mov %rsp,%rbp
|
||
.profilable
|
||
push %rax
|
||
fldt 16(%rbp)
|
||
fnstcw -6(%rbp)
|
||
fnstcw -8(%rbp)
|
||
orb $0b00001100,-7(%rbp) # RC = →0
|
||
fxam # C1 is set to sign bit
|
||
fnstsw
|
||
fabs
|
||
test $FPU_C1>>8,%ah
|
||
fadds .Lhalf(%rip)
|
||
fldcw -8(%rbp)
|
||
frndint
|
||
fldcw -6(%rbp)
|
||
je 1f
|
||
fchs
|
||
1: leave
|
||
ret
|
||
.endfn tinymath_roundl,globl
|
||
.alias tinymath_roundl,roundl
|
||
.source __FILE__
|
||
|
||
.rodata.cst4
|
||
.Lhalf: .float .5
|