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diff --git a/src/pcm/Neon.hxx b/src/pcm/Neon.hxx
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+/*
+ * Copyright (C) 2003-2014 The Music Player Daemon Project
+ * http://www.musicpd.org
+ *
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation; either version 2 of the License, or
+ * (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License along
+ * with this program; if not, write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ */
+
+#ifndef MPD_PCM_NEON_HXX
+#define MPD_PCM_NEON_HXX
+
+#include "Traits.hxx"
+
+#include <arm_neon.h>
+
+/**
+ * Call a NEON intrinsic for each element in the vector.
+ *
+ * @param func the NEON intrinsic
+ * @param result the vector variable that gets assigned the result
+ * @param vector the input vector
+ */
+#define neon_x4_u(func, result, vector) do { \
+ result.val[0] = func(vector.val[0]); \
+ result.val[1] = func(vector.val[1]); \
+ result.val[2] = func(vector.val[2]); \
+ result.val[3] = func(vector.val[3]); \
+} while (0)
+
+/**
+ * Call a NEON intrinsic for each element in the vector.
+ *
+ * @param func the NEON intrinsic
+ * @param result the vector variable that gets assigned the result
+ * @param vector the input vector
+ */
+#define neon_x4_b(func, result, vector, ...) do { \
+ result.val[0] = func(vector.val[0], __VA_ARGS__); \
+ result.val[1] = func(vector.val[1], __VA_ARGS__); \
+ result.val[2] = func(vector.val[2], __VA_ARGS__); \
+ result.val[3] = func(vector.val[3], __VA_ARGS__); \
+} while (0)
+
+/**
+ * Convert floating point samples to 16 bit signed integer using ARM NEON.
+ */
+struct NeonFloatTo16 {
+ static constexpr SampleFormat src_format = SampleFormat::FLOAT;
+ static constexpr SampleFormat dst_format = SampleFormat::S16;
+ typedef SampleTraits<src_format> SrcTraits;
+ typedef SampleTraits<dst_format> DstTraits;
+
+ typedef typename SrcTraits::value_type SV;
+ typedef typename DstTraits::value_type DV;
+
+ static constexpr size_t BLOCK_SIZE = 16;
+
+ void Convert(int16_t *dst, const float *src, const size_t n) const {
+ for (unsigned i = 0; i < n / BLOCK_SIZE;
+ ++i, src += BLOCK_SIZE, dst += BLOCK_SIZE) {
+ /* load 16 float samples into 4 quad
+ registers */
+ float32x4x4_t value = vld4q_f32(src);
+
+ /* convert to 32 bit integer */
+ int32x4x4_t ivalue;
+ neon_x4_b(vcvtq_n_s32_f32, ivalue, value,
+ 30);
+
+ /* convert to 16 bit integer with saturation
+ and rounding */
+ int16x4x4_t nvalue;
+ neon_x4_b(vqrshrn_n_s32, nvalue, ivalue,
+ 30 - DstTraits::BITS + 1);
+
+ /* store result */
+ vst4_s16(dst, nvalue);
+ }
+ }
+};
+
+#endif