2020-06-16 13:38:43 +00:00
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/*-*- mode:unix-assembly; indent-tabs-mode:t; tab-width:8; coding:utf-8 -*-│
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2020-06-15 14:18:57 +00:00
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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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#include "libc/bits/smmintrin.h"
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#include "libc/nexgen32e/x86feature.h"
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2020-06-16 02:01:28 +00:00
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.source __FILE__
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2020-06-15 14:18:57 +00:00
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/ Rounds to nearest integer, away from 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 round(𝑥) = copysign(floor(fabs(𝑥)+.5),𝑥)
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/ round(𝑥) = trunc(𝑥+copysign(.5,𝑥))
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tinymath_round:
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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_round$k8
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.text.antiquity
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tinymath_round$k8:
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.leafprologue
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.profilable
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movapd %xmm0,%xmm1
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movsd D(%rip),%xmm2
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movsd C(%rip),%xmm3
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andpd %xmm2,%xmm1
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ucomisd %xmm1,%xmm3
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jbe 2f
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addsd A(%rip),%xmm1
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andnpd %xmm0,%xmm2
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movapd %xmm2,%xmm0
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cvttsd2siq %xmm1,%rax
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pxor %xmm1,%xmm1
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cvtsi2sdq %rax,%xmm1
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orpd %xmm1,%xmm0
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2: .leafepilogue
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.endfn tinymath_round$k8,globl,hidden
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.previous
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.rodata.cst16
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C: .quad 0x4330000000000000,0
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D: .quad 0x7fffffffffffffff,0
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.previous
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#endif
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movapd %xmm0,%xmm1
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andpd B(%rip),%xmm0
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orpd A(%rip),%xmm0
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addsd %xmm1,%xmm0
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roundsd $_MM_FROUND_TO_ZERO,%xmm0,%xmm0
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ret
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.endfn tinymath_round,globl
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.alias tinymath_round,round
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.rodata.cst16
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A: .quad 0x3fdfffffffffffff,0
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B: .quad 0x8000000000000000,0
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