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49 lines
2.5 KiB
ArmAsm
49 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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│ Permission to use, copy, modify, and/or distribute this software for │
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│ any purpose with or without fee is hereby granted, provided that the │
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│ above copyright notice and this permission notice appear in all copies. │
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│ │
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│ THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL │
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│ WARRANTIES WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED │
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│ WARRANTIES OF MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE │
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│ AUTHOR BE LIABLE FOR ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL │
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│ DAMAGES OR ANY DAMAGES WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR │
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│ PROFITS, WHETHER IN AN ACTION OF CONTRACT, NEGLIGENCE OR OTHER │
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│ TORTIOUS ACTION, ARISING OUT OF OR IN CONNECTION WITH THE USE OR │
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│ PERFORMANCE OF THIS SOFTWARE. │
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╚─────────────────────────────────────────────────────────────────────────────*/
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#include "libc/macros.internal.h"
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// Rounds to integer, toward zero.
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//
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// @param 𝑥 is float scalar in low quarter of %xmm0
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// @return float scalar in low quarter 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 roundss $_MM_FROUND_TO_ZERO|_MM_FROUND_NO_EXC,%xmm0,%xmm0
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truncf: .leafprologue
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.profilable
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movss 3f(%rip),%xmm2
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movss 2f(%rip),%xmm4
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movaps %xmm0,%xmm3
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movaps %xmm0,%xmm1
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andps %xmm2,%xmm3
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ucomiss %xmm3,%xmm4
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jbe 1f
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cvttss2sil %xmm0,%eax
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pxor %xmm0,%xmm0
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andnps %xmm1,%xmm2
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cvtsi2ssl %eax,%xmm0
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orps %xmm2,%xmm0
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1: .leafepilogue
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.endfn truncf,globl
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.rodata.cst4
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2: .long 0x4b000000
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.rodata.cst16
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3: .long 0x7fffffff,0,0,0
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