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https://github.com/jart/cosmopolitan.git
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67 lines
2.7 KiB
ArmAsm
67 lines
2.7 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/nexgen32e/x86feature.h"
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#include "libc/bits/smmintrin.internal.h"
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#include "libc/macros.internal.h"
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// Rounds to nearest integer.
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//
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// @param is double passed in %xmm0
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// @return double in %xmm0
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// @note rounding behavior can be changed in mxcsr
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rint:
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#if !X86_NEED(SSE4_2)
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testb X86_HAVE(SSE4_2)+kCpuids(%rip)
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jz rint$k8
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.text.antiquity
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rint$k8:
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0: movq %xmm0,%rax
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movq %xmm0,%rdx
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shr $52,%rdx
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and $2047,%edx
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cmp $1074,%edx
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jg 2f
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movsd mmm(%rip),%xmm1
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shr $63,%rax
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jne 3f
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addsd %xmm1,%xmm0
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subsd %xmm1,%xmm0
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1: pxor %xmm2,%xmm2
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ucomisd %xmm2,%xmm0
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jp 2f
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jne 2f
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movsd sgn(%rip),%xmm0
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test %rax,%rax
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je 4f
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2: ret
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3: subsd %xmm1,%xmm0
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addsd %xmm1,%xmm0
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jmp 1b
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4: pxor %xmm0,%xmm0
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ret
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.endfn rint$k8,globl,hidden
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.previous
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.rodata.cst8
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sgn: .quad 0x8000000000000000
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mmm: .quad 0x4330000000000000
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.previous
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#endif
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roundsd $_MM_FROUND_RINT,%xmm0,%xmm0
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ret
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.endfn rint,globl
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