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123 lines
2.6 KiB
C
123 lines
2.6 KiB
C
/* fp16i.c
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*
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* Copyright 2021 Red Hat, Inc.
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but 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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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this program. If not, see <http://www.gnu.org/licenses/>.
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*
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* SPDX-License-Identifier: LGPL-2.1-or-later
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*/
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#include "config.h"
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#include "fp16private.h"
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#ifdef HAVE_F16C
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#include <immintrin.h>
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#if defined(_MSC_VER) && !defined(__clang__)
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#define CAST_M128I_P(a) (__m128i const *) a
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#else
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#define CAST_M128I_P(a) (__m128i_u const *) a
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#endif
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void
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float_to_half4_f16c (const float f[4],
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guint16 h[4])
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{
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__m128 s = _mm_loadu_ps (f);
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__m128i i = _mm_cvtps_ph (s, 0);
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_mm_storel_epi64 ((__m128i*)h, i);
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}
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void
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half_to_float4_f16c (const guint16 h[4],
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float f[4])
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{
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__m128i i = _mm_loadl_epi64 (CAST_M128I_P (h));
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__m128 s = _mm_cvtph_ps (i);
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_mm_store_ps (f, s);
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}
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#define ALIGNED(p, n) (GPOINTER_TO_UINT(p) % n == 0)
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void
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float_to_half_f16c (const float *f,
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guint16 *h,
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int n)
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{
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__m128 s;
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__m128i i;
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int j;
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const float *ff = f;
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guint16 *hh = h;
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for (j = 0; j < n; j++)
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{
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if (ALIGNED (ff, 16) && ALIGNED (hh, 16))
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break;
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ff++;
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hh++;
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}
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float_to_half_c (f, h, j);
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for (; j + 4 < n; j += 4)
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{
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s = _mm_loadu_ps (ff);
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i = _mm_cvtps_ph (s, 0);
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_mm_storel_epi64 ((__m128i*)hh, i);
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ff += 4;
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hh += 4;
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}
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if (j < n)
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float_to_half_c (ff, hh, n - j);
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}
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void
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half_to_float_f16c (const guint16 *h,
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float *f,
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int n)
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{
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__m128i i;
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__m128 s;
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int j;
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const guint16 *hh = h;
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float *ff = f;
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for (j = 0; j < n; j++)
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{
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if (ALIGNED (ff, 16) && ALIGNED (hh, 16))
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break;
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ff++;
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hh++;
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}
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half_to_float_c (h, f, j);
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for (; j + 4 < n; j += 4)
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{
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i = _mm_loadl_epi64 (CAST_M128I_P (hh));
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s = _mm_cvtph_ps (i);
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_mm_store_ps (ff, s);
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hh += 4;
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ff += 4;
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}
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if (j < n)
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half_to_float_c (hh, ff, n - j);
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}
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#endif /* HAVE_F16C */
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