1 files changed, 90 insertions, 0 deletions
diff --git a/core/mixer/mixer_sse41.cpp b/core/mixer/mixer_sse41.cpp
new file mode 100644
index 00000000..cacc9e64
--- /dev/null
+++ b/core/mixer/mixer_sse41.cpp
@@ -0,0 +1,90 @@
+/**
+ * OpenAL cross platform audio library
+ * Copyright (C) 2014 by Timothy Arceri <[email protected]>.
+ * This library is free software; you can redistribute it and/or
+ *  modify it under the terms of the GNU Library General Public
+ *  License as published by the Free Software Foundation; either
+ *  version 2 of the License, or (at your option) any later version.
+ *
+ * This library 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
+ *  Library General Public License for more details.
+ *
+ * You should have received a copy of the GNU Library General Public
+ *  License along with this library; if not, write to the
+ *  Free Software Foundation, Inc.,
+ *  51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
+ * Or go to http://www.gnu.org/copyleft/lgpl.html
+ */
+
+#include "config.h"
+
+#include <xmmintrin.h>
+#include <emmintrin.h>
+#include <smmintrin.h>
+
+#include "alnumeric.h"
+#include "defs.h"
+
+struct SSE4Tag;
+struct LerpTag;
+
+
+template<>
+const float *Resample_<LerpTag,SSE4Tag>(const InterpState*, const float *RESTRICT src, uint frac,
+    uint increment, const al::span<float> dst)
+{
+    const __m128i increment4{_mm_set1_epi32(static_cast<int>(increment*4))};
+    const __m128 fracOne4{_mm_set1_ps(1.0f/MixerFracOne)};
+    const __m128i fracMask4{_mm_set1_epi32(MixerFracMask)};
+
+    alignas(16) uint pos_[4], frac_[4];
+    InitPosArrays(frac, increment, frac_, pos_, 4);
+    __m128i frac4{_mm_setr_epi32(static_cast<int>(frac_[0]), static_cast<int>(frac_[1]),
+        static_cast<int>(frac_[2]), static_cast<int>(frac_[3]))};
+    __m128i pos4{_mm_setr_epi32(static_cast<int>(pos_[0]), static_cast<int>(pos_[1]),
+        static_cast<int>(pos_[2]), static_cast<int>(pos_[3]))};
+
+    auto dst_iter = dst.begin();
+    for(size_t todo{dst.size()>>2};todo;--todo)
+    {
+        const int pos0{_mm_extract_epi32(pos4, 0)};
+        const int pos1{_mm_extract_epi32(pos4, 1)};
+        const int pos2{_mm_extract_epi32(pos4, 2)};
+        const int pos3{_mm_extract_epi32(pos4, 3)};
+        const __m128 val1{_mm_setr_ps(src[pos0  ], src[pos1  ], src[pos2  ], src[pos3  ])};
+        const __m128 val2{_mm_setr_ps(src[pos0+1], src[pos1+1], src[pos2+1], src[pos3+1])};
+
+        /* val1 + (val2-val1)*mu */
+        const __m128 r0{_mm_sub_ps(val2, val1)};
+        const __m128 mu{_mm_mul_ps(_mm_cvtepi32_ps(frac4), fracOne4)};
+        const __m128 out{_mm_add_ps(val1, _mm_mul_ps(mu, r0))};
+
+        _mm_store_ps(dst_iter, out);
+        dst_iter += 4;
+
+        frac4 = _mm_add_epi32(frac4, increment4);
+        pos4 = _mm_add_epi32(pos4, _mm_srli_epi32(frac4, MixerFracBits));
+        frac4 = _mm_and_si128(frac4, fracMask4);
+    }
+
+    if(size_t todo{dst.size()&3})
+    {
+        /* NOTE: These four elements represent the position *after* the last
+         * four samples, so the lowest element is the next position to
+         * resample.
+         */
+        src += static_cast<uint>(_mm_cvtsi128_si32(pos4));
+        frac = static_cast<uint>(_mm_cvtsi128_si32(frac4));
+
+        do {
+            *(dst_iter++) = lerp(src[0], src[1], static_cast<float>(frac) * (1.0f/MixerFracOne));
+
+            frac += increment;
+            src  += frac>>MixerFracBits;
+            frac &= MixerFracMask;
+        } while(--todo);
+    }
+    return dst.data();
+}