mirror of
https://github.com/jart/cosmopolitan.git
synced 2026-11-09 02:39:44 -10:00
53 lines
2.5 KiB
ArmAsm
53 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 │
|
||
│ │
|
||
│ 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.internal.h"
|
||
|
||
// Rounds to integer, toward zero.
|
||
//
|
||
// @param 𝑥 is double scalar in low half of %xmm0
|
||
// @return double scalar in low half of %xmm0
|
||
// @define trunc(𝑥+copysign(.5,𝑥))
|
||
// @see round(),rint(),nearbyint()
|
||
// @see roundsd $_MM_FROUND_TO_ZERO|_MM_FROUND_NO_EXC,%xmm0,%xmm0
|
||
trunc: .leafprologue
|
||
.profilable
|
||
movsd 3f(%rip),%xmm2
|
||
movsd 2f(%rip),%xmm4
|
||
movapd %xmm0,%xmm3
|
||
movapd %xmm0,%xmm1
|
||
andpd %xmm2,%xmm3
|
||
ucomisd %xmm3,%xmm4
|
||
jbe 1f
|
||
cvttsd2siq %xmm0,%rax
|
||
pxor %xmm0,%xmm0
|
||
andnpd %xmm1,%xmm2
|
||
cvtsi2sdq %rax,%xmm0
|
||
orpd %xmm2,%xmm0
|
||
1: .leafepilogue
|
||
.endfn trunc,globl
|
||
|
||
.rodata.cst8
|
||
2: .long 0x00000000
|
||
.long 0x43300000
|
||
.rodata.cst16
|
||
3: .long 0xffffffff
|
||
.long 0x7fffffff
|
||
.long 0x00000000
|
||
.long 0x00000000
|