48 lines
2.5 KiB
ArmAsm
48 lines
2.5 KiB
ArmAsm
/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
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│vi: set et ft=asm ts=8 tw=8 fenc=utf-8 :vi│
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╞══════════════════════════════════════════════════════════════════════════════╡
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│ Copyright 2020 Justine Alexandra Roberts Tunney │
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│ │
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│ This program is free software; you can redistribute it and/or modify │
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│ it under the terms of the GNU General Public License as published by │
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│ the Free Software Foundation; version 2 of the License. │
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│ │
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│ This program is distributed in the hope that it will be useful, but │
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│ WITHOUT ANY WARRANTY; without even the implied warranty of │
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│ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU │
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│ General Public License for more details. │
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│ │
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│ You should have received a copy of the GNU General Public License │
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│ along with this program; if not, write to the Free Software │
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│ Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA │
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│ 02110-1301 USA │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/macros.h"
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.source __FILE__
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/ Rounds to integer, toward zero.
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/
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/ @param 𝑥 is double scalar in low half of %xmm0
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/ @return double scalar in low half of %xmm0
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/ @define trunc(𝑥+copysign(.5,𝑥))
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/ @see round(),rint(),nearbyint()
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/ @see roundsd $_MM_FROUND_TO_ZERO|_MM_FROUND_NO_EXC,%xmm0,%xmm0
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tinymath_trunc:
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.leafprologue
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.profilable
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movsd 3f(%rip),%xmm1
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movsd 2f(%rip),%xmm2
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andpd %xmm0,%xmm1
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comisd %xmm1,%xmm2
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jbe 1f
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cvttsd2siq %xmm0,%rax
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pxor %xmm0,%xmm0
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cvtsi2sdq %rax,%xmm0
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1: .leafepilogue
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.endfn tinymath_trunc,globl
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.alias tinymath_trunc,trunc
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.rodata.cst8
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2: .double 0x0010000000000000
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3: .double nan
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