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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2020-11-25 16:19:00 +00:00
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#include "libc/bits/smmintrin.internal.h"
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2020-06-15 14:18:57 +00:00
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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 float scalar in low quarter of %xmm0
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/ @return float scalar in low quarter of %xmm0
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tinymath_roundf:
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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_roundf$k8
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.text.antiquity
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tinymath_roundf$k8:
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.leafprologue
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.profilable
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movaps %xmm0,%xmm1
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movss D(%rip),%xmm2
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movss C(%rip),%xmm3
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andps %xmm2,%xmm1
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ucomiss %xmm1,%xmm3
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jbe 2f
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addss A(%rip),%xmm1
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cvttss2sil %xmm1,%eax
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pxor %xmm1,%xmm1
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cvtsi2ssl %eax,%xmm1
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andnps %xmm0,%xmm2
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movaps %xmm2,%xmm0
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orps %xmm1,%xmm0
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2: .leafepilogue
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.endfn tinymath_roundf$k8,globl,hidden
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.previous
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.rodata.cst16
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C: .long 0x4b000000,0,0,0
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D: .long 0x7fffffff,0,0,0
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.previous
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#endif
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movaps %xmm0,%xmm1
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andps B(%rip),%xmm0
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orps A(%rip),%xmm0
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addss %xmm1,%xmm0
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roundss $_MM_FROUND_TO_ZERO,%xmm0,%xmm0
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ret
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.endfn tinymath_roundf,globl
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.alias tinymath_roundf,roundf
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.rodata.cst16
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A: .long 0x3effffff,0,0,0
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B: .long 0x80000000,0,0,0
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