mirror of
https://github.com/jart/cosmopolitan.git
synced 2025-01-31 03:27:39 +00:00
42 lines
2.3 KiB
ArmAsm
42 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 │
|
||
│ │
|
||
│ 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/runtime/pc.internal.h"
|
||
#include "libc/macros.internal.h"
|
||
|
||
// Returns 𝑥 with same sign as 𝑦.
|
||
//
|
||
// @param 𝑥 is an 80-bit long double passed on stack in 16-bytes
|
||
// @param 𝑦 is the power, also pushed on stack, in reverse order
|
||
// @return result on FPU stack in %st
|
||
copysignl:
|
||
push %rbp
|
||
mov %rsp,%rbp
|
||
.profilable
|
||
fldt 32(%rbp)
|
||
fxam
|
||
fnstsw
|
||
fstp %st
|
||
fldt 16(%rbp)
|
||
test $FPU_C1>>8,%ah
|
||
fabs
|
||
je 1f
|
||
fchs
|
||
1: pop %rbp
|
||
ret
|
||
.endfn copysignl,globl
|