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59 lines
2.6 KiB
ArmAsm
59 lines
2.6 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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// Returns largest integral not greater than 𝑥.
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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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floor: .leafprologue
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.profilable
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movsd 4f(%rip),%xmm3
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movsd 2f(%rip),%xmm4
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movapd %xmm0,%xmm2
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movapd %xmm0,%xmm1
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andpd %xmm3,%xmm2
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ucomisd %xmm2,%xmm4
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jbe 1f
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cvttsd2siq %xmm0,%rax
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pxor %xmm2,%xmm2
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movsd 3f(%rip),%xmm4
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andnpd %xmm1,%xmm3
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cvtsi2sdq %rax,%xmm2
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movapd %xmm2,%xmm5
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cmpnlesd %xmm0,%xmm5
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movapd %xmm5,%xmm0
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andpd %xmm4,%xmm0
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subsd %xmm0,%xmm2
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movapd %xmm2,%xmm0
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orpd %xmm3,%xmm0
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1: .leafepilogue
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.endfn floor,globl
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.rodata.cst8
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2: .long 0x00000000
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.long 0x43300000
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3: .long 0x00000000
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.long 0x3ff00000
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.rodata.cst16
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4: .long 0xffffffff
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.long 0x7fffffff
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.long 0x00000000
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.long 0x00000000
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