diff options
Diffstat (limited to 'src/corelib/global/qfloat16_f16c.c')
-rw-r--r-- | src/corelib/global/qfloat16_f16c.c | 87 |
1 files changed, 87 insertions, 0 deletions
diff --git a/src/corelib/global/qfloat16_f16c.c b/src/corelib/global/qfloat16_f16c.c new file mode 100644 index 0000000000..89c85bba8f --- /dev/null +++ b/src/corelib/global/qfloat16_f16c.c @@ -0,0 +1,87 @@ +/**************************************************************************** +** +** Copyright (C) 2017 The Qt Company Ltd. +** Contact: https://www.qt.io/licensing/ +** +** This file is part of the QtCore module of the Qt Toolkit. +** +** $QT_BEGIN_LICENSE:LGPL$ +** Commercial License Usage +** Licensees holding valid commercial Qt licenses may use this file in +** accordance with the commercial license agreement provided with the +** Software or, alternatively, in accordance with the terms contained in +** a written agreement between you and The Qt Company. For licensing terms +** and conditions see https://www.qt.io/terms-conditions. For further +** information use the contact form at https://www.qt.io/contact-us. +** +** GNU Lesser General Public License Usage +** Alternatively, this file may be used under the terms of the GNU Lesser +** General Public License version 3 as published by the Free Software +** Foundation and appearing in the file LICENSE.LGPL3 included in the +** packaging of this file. Please review the following information to +** ensure the GNU Lesser General Public License version 3 requirements +** will be met: https://www.gnu.org/licenses/lgpl-3.0.html. +** +** GNU General Public License Usage +** Alternatively, this file may be used under the terms of the GNU +** General Public License version 2.0 or (at your option) the GNU General +** Public license version 3 or any later version approved by the KDE Free +** Qt Foundation. The licenses are as published by the Free Software +** Foundation and appearing in the file LICENSE.GPL2 and LICENSE.GPL3 +** included in the packaging of this file. Please review the following +** information to ensure the GNU General Public License requirements will +** be met: https://www.gnu.org/licenses/gpl-2.0.html and +** https://www.gnu.org/licenses/gpl-3.0.html. +** +** $QT_END_LICENSE$ +** +****************************************************************************/ + +#include "private/qsimd_p.h" + +// The x86 F16C instructions operate on AVX registers, so AVX support is +// required. We don't need to check for __F16C__ because we this file wouldn't +// have been compiled if the support was missing in the first place, and not +// all compilers define it. Technically, we didn't need to check for __AVX__ +// either. +#if !defined(__AVX__) +# error "AVX support required" +#endif + +#ifdef __cplusplus +QT_BEGIN_NAMESPACE +extern "C" { +#endif + +void qFloatToFloat16_fast(quint16 *out, const float *in, qssize_t len) Q_DECL_NOTHROW +{ + qssize_t i = 0; + for (; i < len - 7; i += 8) + _mm_storeu_si128((__m128i *)(out + i), _mm256_cvtps_ph(_mm256_loadu_ps(in + i), 0)); + if (i < len - 3) { + _mm_storel_epi64((__m128i *)(out + i), _mm_cvtps_ph(_mm_loadu_ps(in + i), 0)); + i += 4; + } + // Inlining "quint16::quint16(float f)" to avoid getting the fallback version. + SIMD_EPILOGUE(i, len, 3) + out[i] = _mm_extract_epi16(_mm_cvtps_ph(_mm_set_ss(in[i]), 0), 0); +} + +void qFloatFromFloat16_fast(float *out, const quint16 *in, qssize_t len) Q_DECL_NOTHROW +{ + qssize_t i = 0; + for (; i < len - 7; i += 8) + _mm256_storeu_ps(out + i, _mm256_cvtph_ps(_mm_loadu_si128((const __m128i *)(in + i)))); + if (i < len - 3) { + _mm_storeu_ps(out + i, _mm_cvtph_ps(_mm_loadl_epi64((const __m128i *)(in + i)))); + i += 4; + } + // Inlining "quint16::operator float()" to avoid getting the fallback version. + SIMD_EPILOGUE(i, len, 3) + out[i] = _mm_cvtss_f32(_mm_cvtph_ps(_mm_cvtsi32_si128(in[i]))); +} + +#ifdef __cplusplus +} // extern "C" +QT_END_NAMESPACE +#endif |