71 lines
2.8 KiB
ArmAsm
71 lines
2.8 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/nexgen32e/x86feature.h"
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#include "libc/bits/smmintrin.h"
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#include "libc/macros.h"
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.source __FILE__
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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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tinymath_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 tinymath_rint$k8
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.text.antiquity
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tinymath_rint$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 $63,%rax
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jne 3f
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addsd %xmm1,%xmm0
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subsd %xmm1,%xmm0
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1: pxor %xmm2,%xmm2
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ucomisd %xmm2,%xmm0
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jp 2f
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jne 2f
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movsd sgn(%rip),%xmm0
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test %rax,%rax
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je 4f
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2: ret
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3: subsd %xmm1,%xmm0
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addsd %xmm1,%xmm0
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jmp 1b
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4: pxor %xmm0,%xmm0
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ret
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.endfn tinymath_rint$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 tinymath_rint,globl
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.alias tinymath_rint,rint
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