2020-06-16 13:38:43 +00:00
|
|
|
|
/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
|
2020-06-15 14:18:57 +00:00
|
|
|
|
│vi: set et ft=asm ts=8 tw=8 fenc=utf-8 :vi│
|
|
|
|
|
|
╞══════════════════════════════════════════════════════════════════════════════╡
|
|
|
|
|
|
│ Copyright 2020 Justine Alexandra Roberts Tunney │
|
|
|
|
|
|
│ │
|
2020-12-28 01:18:44 +00:00
|
|
|
|
│ 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. │
|
2020-06-15 14:18:57 +00:00
|
|
|
|
│ │
|
2020-12-28 01:18:44 +00:00
|
|
|
|
│ 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. │
|
2020-06-15 14:18:57 +00:00
|
|
|
|
╚─────────────────────────────────────────────────────────────────────────────*/
|
2021-03-01 07:42:35 +00:00
|
|
|
|
#include "libc/macros.internal.h"
|
2020-06-15 14:18:57 +00:00
|
|
|
|
|
2021-02-08 17:19:00 +00:00
|
|
|
|
// 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
|
2021-02-01 02:25:16 +00:00
|
|
|
|
trunc: .leafprologue
|
2020-06-15 14:18:57 +00:00
|
|
|
|
.profilable
|
2021-03-02 21:57:23 +00:00
|
|
|
|
movsd 3f(%rip),%xmm2
|
|
|
|
|
|
movsd 2f(%rip),%xmm4
|
|
|
|
|
|
movapd %xmm0,%xmm3
|
|
|
|
|
|
movapd %xmm0,%xmm1
|
|
|
|
|
|
andpd %xmm2,%xmm3
|
|
|
|
|
|
ucomisd %xmm3,%xmm4
|
2020-06-15 14:18:57 +00:00
|
|
|
|
jbe 1f
|
|
|
|
|
|
cvttsd2siq %xmm0,%rax
|
|
|
|
|
|
pxor %xmm0,%xmm0
|
2021-03-02 21:57:23 +00:00
|
|
|
|
andnpd %xmm1,%xmm2
|
2020-06-15 14:18:57 +00:00
|
|
|
|
cvtsi2sdq %rax,%xmm0
|
2021-03-02 21:57:23 +00:00
|
|
|
|
orpd %xmm2,%xmm0
|
2020-06-15 14:18:57 +00:00
|
|
|
|
1: .leafepilogue
|
2021-02-01 02:25:16 +00:00
|
|
|
|
.endfn trunc,globl
|
2020-06-15 14:18:57 +00:00
|
|
|
|
|
|
|
|
|
|
.rodata.cst8
|
2021-03-02 21:57:23 +00:00
|
|
|
|
2: .long 0x00000000
|
|
|
|
|
|
.long 0x43300000
|
|
|
|
|
|
.rodata.cst16
|
|
|
|
|
|
3: .long 0xffffffff
|
|
|
|
|
|
.long 0x7fffffff
|
|
|
|
|
|
.long 0x00000000
|
|
|
|
|
|
.long 0x00000000
|
