Optimize Sound Mixer (#182)

* Add sse2neon

* Optimize Sound Mixer

* Replace ssize_t with size_t

* Remove a #ifndef NO_SEGMENTED_MEMORY block

5 files changed, 659 insertions, 173 deletions

diff --git a/CMakeLists.txt b/CMakeLists.txt
index e44571372..9a4bcd524 100644
--- a/CMakeLists.txt
+++ b/CMakeLists.txt
@@ -215,6 +215,12 @@ if (MSVC)
   endif()
 endif()
 
+#=================== SSE2NEON ===================
+set(SSE2NEON_DIR ${CMAKE_BINARY_DIR}/_deps/sse2neon)
+file(DOWNLOAD "https://raw.githubusercontent.com/DLTcollab/sse2neon/refs/heads/master/sse2neon.h" "${SSE2NEON_DIR}/sse2neon.h")
+
+include_directories(${SSE2NEON_DIR})
+
 #==============================================================================#
 # Libultraship Integration                                                            #
 #==============================================================================#
diff --git a/src/audio/load.c b/src/audio/load.c
index 0807407ae..4a56b86d7 100644
--- a/src/audio/load.c
+++ b/src/audio/load.c
@@ -129,9 +129,9 @@ void audio_dma_copy_async(uintptr_t devAddr, void* vAddr, size_t nbytes, OSMesgQ
  * Performs a partial asynchronous (normal priority) DMA copy. This is limited
  * to 0x1000 bytes transfer at once.
  */
-void audio_dma_partial_copy_async(uintptr_t* devAddr, u8** vAddr, ssize_t* remaining, OSMesgQueue* queue,
+void audio_dma_partial_copy_async(uintptr_t* devAddr, u8** vAddr, size_t* remaining, OSMesgQueue* queue,
                                   OSIoMesg* mesg) {
-    ssize_t transfer = (*remaining >= 0x1000 ? 0x1000 : *remaining);
+    size_t transfer = (*remaining >= 0x1000 ? 0x1000 : *remaining);
     *remaining -= transfer;
     osInvalDCache(*vAddr, transfer);
     osPiStartDma(mesg, OS_MESG_PRI_NORMAL, OS_READ, *devAddr, *vAddr, transfer, queue);
@@ -174,7 +174,7 @@ void* dma_sample_data(uintptr_t devAddr, u32 size, s32 arg2, u8* dmaIndexRef) {
     u32 transfer;
     u32 i;
     u32 dmaIndex;
-    ssize_t bufferPos;
+    size_t bufferPos;
     UNUSED u32 pad;
 
     if (arg2 != 0 || *dmaIndexRef >= sSampleDmaListSize1) {
@@ -604,11 +604,11 @@ uint8_t* load_sequence_immediate(s32 seqId, s32 arg1) {
     return GameEngine_LoadSequence(seqId)->data;
 }
 
-struct CtlEntry* load_banks_immediate(s32 seqId, u8 *outDefaultBank) {
+struct CtlEntry* load_banks_immediate(s32 seqId, u8* outDefaultBank) {
     u32 bankId;
-    struct AudioSequenceData *seqData = GameEngine_LoadSequence(seqId);
-    struct CtlEntry *output;
-    for(size_t i = 0; i < seqData->bankCount; i++) {
+    struct AudioSequenceData* seqData = GameEngine_LoadSequence(seqId);
+    struct CtlEntry* output;
+    for (size_t i = 0; i < seqData->bankCount; i++) {
         output = GameEngine_LoadBank(bankId = seqData->banks[i]);
     }
     *outDefaultBank = bankId;
@@ -659,7 +659,7 @@ void load_sequence(u32 player, u32 seqId, s32 loadAsync) {
 }
 
 void load_sequence_internal(u32 player, u32 seqId, s32 loadAsync) {
-    struct SequencePlayer *seqPlayer = &gSequencePlayers[player];
+    struct SequencePlayer* seqPlayer = &gSequencePlayers[player];
 
     if (seqId >= gSequenceCount) {
         return;
@@ -808,7 +808,6 @@ void audio_init(void) {
     audio_set_player_volume(SEQ_PLAYER_LEVEL, CVarGetFloat("gMainMusicVolume", 1.0f));
     audio_set_player_volume(SEQ_PLAYER_ENV, CVarGetFloat("gEnvironmentVolume", 1.0f));
     audio_set_player_volume(SEQ_PLAYER_SFX, CVarGetFloat("gSFXMusicVolume", 1.0f));
-
 }
 #else
 #ifdef VERSION_EU
diff --git a/src/audio/load.h b/src/audio/load.h
index 0439d647b..4b4200c8c 100644
--- a/src/audio/load.h
+++ b/src/audio/load.h
@@ -26,7 +26,7 @@ struct SharedDma {
 void audio_init(void);
 void audio_dma_copy_immediate(u8* devAddr, void* vAddr, size_t nbytes);
 void audio_dma_copy_async(uintptr_t, void*, size_t, OSMesgQueue*, OSIoMesg*);
-void audio_dma_partial_copy_async(uintptr_t*, u8**, ssize_t*, OSMesgQueue*, OSIoMesg*);
+void audio_dma_partial_copy_async(uintptr_t*, u8**, size_t*, OSMesgQueue*, OSIoMesg*);
 void decrease_sample_dma_ttls(void);
 void* dma_sample_data(uintptr_t, u32, s32, u8*);
 void func_800BB030(s32);
diff --git a/src/audio/mixer.c b/src/audio/mixer.c
index a1154886e..9b8157ab5 100644
--- a/src/audio/mixer.c
+++ b/src/audio/mixer.c
@@ -3,10 +3,66 @@
 #include <string.h>
 #include <stdio.h>
 
+#include <align_asset_macro.h>
+
 #include "mixer.h"
 
 #ifndef __clang__
-#pragma GCC optimize ("unroll-loops")
+#pragma GCC optimize("unroll-loops")
+#endif
+
+#if defined(__SSE2__) || defined(__aarch64__)
+#define SSE2_AVAILABLE
+#else
+#pragma message("Warning: SSE2 support is not available. Code will not compile")
+#endif
+
+#if defined(__SSE2__)
+#include <emmintrin.h>
+#elif defined(__aarch64__)
+#include "sse2neon.h"
+#endif
+
+#ifdef SSE2_AVAILABLE
+typedef struct {
+    __m128i lo, hi;
+} m256i;
+
+static m256i m256i_mul_epi16(__m128i a, __m128i b) {
+    m256i res;
+    res.lo = _mm_mullo_epi16(a, b);
+    res.hi = _mm_mulhi_epi16(a, b);
+
+    m256i ret;
+    ret.lo = _mm_unpacklo_epi16(res.lo, res.hi);
+    ret.hi = _mm_unpackhi_epi16(res.lo, res.hi);
+    return ret;
+}
+
+static m256i m256i_add_m256i_epi32(m256i a, m256i b) {
+    m256i res;
+    res.lo = _mm_add_epi32(a.lo, b.lo);
+    res.hi = _mm_add_epi32(a.hi, b.hi);
+    return res;
+}
+
+static m256i m256i_add_m128i_epi32(m256i a, __m128i b) {
+    m256i res;
+    res.lo = _mm_add_epi32(a.lo, b);
+    res.hi = _mm_add_epi32(a.hi, b);
+    return res;
+}
+
+static m256i m256i_srai(m256i a, int b) {
+    m256i res;
+    res.lo = _mm_srai_epi32(a.lo, b);
+    res.hi = _mm_srai_epi32(a.hi, b);
+    return res;
+}
+
+static __m128i m256i_clamp_to_m128i(m256i a) {
+    return _mm_packs_epi32(a.lo, a.hi);
+}
 #endif
 
 #define ROUND_UP_64(v) (((v) + 63) & ~63)
@@ -15,7 +71,7 @@
 #define ROUND_UP_8(v) (((v) + 7) & ~7)
 #define ROUND_DOWN_16(v) ((v) & ~0xf)
 
-//#define DMEM_BUF_SIZE (0x1000 - 0x0330 - 0x10 - 0x40)
+// #define DMEM_BUF_SIZE (0x1000 - 0x0330 - 0x10 - 0x40)
 #define DMEM_BUF_SIZE 0x17D0
 #define BUF_U8(a) (rspa.buf.as_u8 + (a))
 #define BUF_S16(a) (rspa.buf.as_s16 + (a) / sizeof(int16_t))
@@ -30,7 +86,7 @@ static struct {
     uint16_t vol_wet;
     uint16_t rate_wet;
 
-    ADPCM_STATE *adpcm_loop_state;
+    ADPCM_STATE* adpcm_loop_state;
 
     int16_t adpcm_table[8][2][8];
 
@@ -44,38 +100,28 @@ static struct {
 } rspa;
 
 static int16_t resample_table[64][4] = {
-    {0x0c39, 0x66ad, 0x0d46, 0xffdf}, {0x0b39, 0x6696, 0x0e5f, 0xffd8},
-    {0x0a44, 0x6669, 0x0f83, 0xffd0}, {0x095a, 0x6626, 0x10b4, 0xffc8},
-    {0x087d, 0x65cd, 0x11f0, 0xffbf}, {0x07ab, 0x655e, 0x1338, 0xffb6},
-    {0x06e4, 0x64d9, 0x148c, 0xffac}, {0x0628, 0x643f, 0x15eb, 0xffa1},
-    {0x0577, 0x638f, 0x1756, 0xff96}, {0x04d1, 0x62cb, 0x18cb, 0xff8a},
-    {0x0435, 0x61f3, 0x1a4c, 0xff7e}, {0x03a4, 0x6106, 0x1bd7, 0xff71},
-    {0x031c, 0x6007, 0x1d6c, 0xff64}, {0x029f, 0x5ef5, 0x1f0b, 0xff56},
-    {0x022a, 0x5dd0, 0x20b3, 0xff48}, {0x01be, 0x5c9a, 0x2264, 0xff3a},
-    {0x015b, 0x5b53, 0x241e, 0xff2c}, {0x0101, 0x59fc, 0x25e0, 0xff1e},
-    {0x00ae, 0x5896, 0x27a9, 0xff10}, {0x0063, 0x5720, 0x297a, 0xff02},
-    {0x001f, 0x559d, 0x2b50, 0xfef4}, {0xffe2, 0x540d, 0x2d2c, 0xfee8},
-    {0xffac, 0x5270, 0x2f0d, 0xfedb}, {0xff7c, 0x50c7, 0x30f3, 0xfed0},
-    {0xff53, 0x4f14, 0x32dc, 0xfec6}, {0xff2e, 0x4d57, 0x34c8, 0xfebd},
-    {0xff0f, 0x4b91, 0x36b6, 0xfeb6}, {0xfef5, 0x49c2, 0x38a5, 0xfeb0},
-    {0xfedf, 0x47ed, 0x3a95, 0xfeac}, {0xfece, 0x4611, 0x3c85, 0xfeab},
-    {0xfec0, 0x4430, 0x3e74, 0xfeac}, {0xfeb6, 0x424a, 0x4060, 0xfeaf},
-    {0xfeaf, 0x4060, 0x424a, 0xfeb6}, {0xfeac, 0x3e74, 0x4430, 0xfec0},
-    {0xfeab, 0x3c85, 0x4611, 0xfece}, {0xfeac, 0x3a95, 0x47ed, 0xfedf},
-    {0xfeb0, 0x38a5, 0x49c2, 0xfef5}, {0xfeb6, 0x36b6, 0x4b91, 0xff0f},
-    {0xfebd, 0x34c8, 0x4d57, 0xff2e}, {0xfec6, 0x32dc, 0x4f14, 0xff53},
-    {0xfed0, 0x30f3, 0x50c7, 0xff7c}, {0xfedb, 0x2f0d, 0x5270, 0xffac},
-    {0xfee8, 0x2d2c, 0x540d, 0xffe2}, {0xfef4, 0x2b50, 0x559d, 0x001f},
-    {0xff02, 0x297a, 0x5720, 0x0063}, {0xff10, 0x27a9, 0x5896, 0x00ae},
-    {0xff1e, 0x25e0, 0x59fc, 0x0101}, {0xff2c, 0x241e, 0x5b53, 0x015b},
-    {0xff3a, 0x2264, 0x5c9a, 0x01be}, {0xff48, 0x20b3, 0x5dd0, 0x022a},
-    {0xff56, 0x1f0b, 0x5ef5, 0x029f}, {0xff64, 0x1d6c, 0x6007, 0x031c},
-    {0xff71, 0x1bd7, 0x6106, 0x03a4}, {0xff7e, 0x1a4c, 0x61f3, 0x0435},
-    {0xff8a, 0x18cb, 0x62cb, 0x04d1}, {0xff96, 0x1756, 0x638f, 0x0577},
-    {0xffa1, 0x15eb, 0x643f, 0x0628}, {0xffac, 0x148c, 0x64d9, 0x06e4},
-    {0xffb6, 0x1338, 0x655e, 0x07ab}, {0xffbf, 0x11f0, 0x65cd, 0x087d},
-    {0xffc8, 0x10b4, 0x6626, 0x095a}, {0xffd0, 0x0f83, 0x6669, 0x0a44},
-    {0xffd8, 0x0e5f, 0x6696, 0x0b39}, {0xffdf, 0x0d46, 0x66ad, 0x0c39}
+    { 0x0c39, 0x66ad, 0x0d46, 0xffdf }, { 0x0b39, 0x6696, 0x0e5f, 0xffd8 }, { 0x0a44, 0x6669, 0x0f83, 0xffd0 },
+    { 0x095a, 0x6626, 0x10b4, 0xffc8 }, { 0x087d, 0x65cd, 0x11f0, 0xffbf }, { 0x07ab, 0x655e, 0x1338, 0xffb6 },
+    { 0x06e4, 0x64d9, 0x148c, 0xffac }, { 0x0628, 0x643f, 0x15eb, 0xffa1 }, { 0x0577, 0x638f, 0x1756, 0xff96 },
+    { 0x04d1, 0x62cb, 0x18cb, 0xff8a }, { 0x0435, 0x61f3, 0x1a4c, 0xff7e }, { 0x03a4, 0x6106, 0x1bd7, 0xff71 },
+    { 0x031c, 0x6007, 0x1d6c, 0xff64 }, { 0x029f, 0x5ef5, 0x1f0b, 0xff56 }, { 0x022a, 0x5dd0, 0x20b3, 0xff48 },
+    { 0x01be, 0x5c9a, 0x2264, 0xff3a }, { 0x015b, 0x5b53, 0x241e, 0xff2c }, { 0x0101, 0x59fc, 0x25e0, 0xff1e },
+    { 0x00ae, 0x5896, 0x27a9, 0xff10 }, { 0x0063, 0x5720, 0x297a, 0xff02 }, { 0x001f, 0x559d, 0x2b50, 0xfef4 },
+    { 0xffe2, 0x540d, 0x2d2c, 0xfee8 }, { 0xffac, 0x5270, 0x2f0d, 0xfedb }, { 0xff7c, 0x50c7, 0x30f3, 0xfed0 },
+    { 0xff53, 0x4f14, 0x32dc, 0xfec6 }, { 0xff2e, 0x4d57, 0x34c8, 0xfebd }, { 0xff0f, 0x4b91, 0x36b6, 0xfeb6 },
+    { 0xfef5, 0x49c2, 0x38a5, 0xfeb0 }, { 0xfedf, 0x47ed, 0x3a95, 0xfeac }, { 0xfece, 0x4611, 0x3c85, 0xfeab },
+    { 0xfec0, 0x4430, 0x3e74, 0xfeac }, { 0xfeb6, 0x424a, 0x4060, 0xfeaf }, { 0xfeaf, 0x4060, 0x424a, 0xfeb6 },
+    { 0xfeac, 0x3e74, 0x4430, 0xfec0 }, { 0xfeab, 0x3c85, 0x4611, 0xfece }, { 0xfeac, 0x3a95, 0x47ed, 0xfedf },
+    { 0xfeb0, 0x38a5, 0x49c2, 0xfef5 }, { 0xfeb6, 0x36b6, 0x4b91, 0xff0f }, { 0xfebd, 0x34c8, 0x4d57, 0xff2e },
+    { 0xfec6, 0x32dc, 0x4f14, 0xff53 }, { 0xfed0, 0x30f3, 0x50c7, 0xff7c }, { 0xfedb, 0x2f0d, 0x5270, 0xffac },
+    { 0xfee8, 0x2d2c, 0x540d, 0xffe2 }, { 0xfef4, 0x2b50, 0x559d, 0x001f }, { 0xff02, 0x297a, 0x5720, 0x0063 },
+    { 0xff10, 0x27a9, 0x5896, 0x00ae }, { 0xff1e, 0x25e0, 0x59fc, 0x0101 }, { 0xff2c, 0x241e, 0x5b53, 0x015b },
+    { 0xff3a, 0x2264, 0x5c9a, 0x01be }, { 0xff48, 0x20b3, 0x5dd0, 0x022a }, { 0xff56, 0x1f0b, 0x5ef5, 0x029f },
+    { 0xff64, 0x1d6c, 0x6007, 0x031c }, { 0xff71, 0x1bd7, 0x6106, 0x03a4 }, { 0xff7e, 0x1a4c, 0x61f3, 0x0435 },
+    { 0xff8a, 0x18cb, 0x62cb, 0x04d1 }, { 0xff96, 0x1756, 0x638f, 0x0577 }, { 0xffa1, 0x15eb, 0x643f, 0x0628 },
+    { 0xffac, 0x148c, 0x64d9, 0x06e4 }, { 0xffb6, 0x1338, 0x655e, 0x07ab }, { 0xffbf, 0x11f0, 0x65cd, 0x087d },
+    { 0xffc8, 0x10b4, 0x6626, 0x095a }, { 0xffd0, 0x0f83, 0x6669, 0x0a44 }, { 0xffd8, 0x0e5f, 0x6696, 0x0b39 },
+    { 0xffdf, 0x0d46, 0x66ad, 0x0c39 }
 };
 
 static inline int16_t clamp16(int32_t v) {
@@ -84,7 +130,7 @@ static inline int16_t clamp16(int32_t v) {
     } else if (v > 0x7fff) {
         return 0x7fff;
     }
-    return (int16_t)v;
+    return (int16_t) v;
 }
 
 static inline int32_t clamp32(int64_t v) {
@@ -93,7 +139,7 @@ static inline int32_t clamp32(int64_t v) {
     } else if (v > 0x7fffffff) {
         return 0x7fffffff;
     }
-    return (int32_t)v;
+    return (int32_t) v;
 }
 
 void aClearBufferImpl(uint16_t addr, int nbytes) {
@@ -101,23 +147,23 @@ void aClearBufferImpl(uint16_t addr, int nbytes) {
     memset(BUF_U8(addr), 0, nbytes);
 }
 
-void aLoadBufferImpl(const void *source_addr, uint16_t dest_addr, uint16_t nbytes) {
+void aLoadBufferImpl(const void* source_addr, uint16_t dest_addr, uint16_t nbytes) {
 #if __SANITIZE_ADDRESS__
     for (size_t i = 0; i < ROUND_DOWN_16(nbytes); i++) {
-        BUF_U8(dest_addr)[i] = ((const unsigned char*)source_addr)[i];
+        BUF_U8(dest_addr)[i] = ((const unsigned char*) source_addr)[i];
     }
 #else
     memcpy(BUF_U8(dest_addr), source_addr, ROUND_DOWN_16(nbytes));
 #endif
 }
 
-void aSaveBufferImpl(uint16_t source_addr, int16_t *dest_addr, uint16_t nbytes) {
-    //printf("source_addr: %x\n dest_addr; %x\n nbytes: %d\n", source_addr, dest_addr, nbytes);
-    //if (nbytes > 704) {nbytes = 704;}
+void aSaveBufferImpl(uint16_t source_addr, int16_t* dest_addr, uint16_t nbytes) {
+    // printf("source_addr: %x\n dest_addr; %x\n nbytes: %d\n", source_addr, dest_addr, nbytes);
+    // if (nbytes > 704) {nbytes = 704;}
     memcpy(dest_addr, BUF_S16(source_addr), ROUND_DOWN_16(nbytes));
 }
 
-void aLoadADPCMImpl(int num_entries_times_16, const int16_t *book_source_addr) {
+void aLoadADPCMImpl(int num_entries_times_16, const int16_t* book_source_addr) {
     memcpy(rspa.adpcm_table, book_source_addr, num_entries_times_16);
 }
 
@@ -129,9 +175,9 @@ void aSetBufferImpl(uint8_t flags, uint16_t in, uint16_t out, uint16_t nbytes) {
 
 void aInterleaveImpl(uint16_t left, uint16_t right) {
     int count = ROUND_UP_16(rspa.nbytes) / sizeof(int16_t) / 8;
-    int16_t *l = BUF_S16(left);
-    int16_t *r = BUF_S16(right);
-    int16_t *d = BUF_S16(rspa.out);
+    int16_t* l = BUF_S16(left);
+    int16_t* r = BUF_S16(right);
+    int16_t* d = BUF_S16(rspa.out);
 
     while (count > 0) {
         int16_t l0 = *l++;
@@ -175,13 +221,17 @@ void aDMEMMoveImpl(uint16_t in_addr, uint16_t out_addr, int nbytes) {
     memmove(BUF_U8(out_addr), BUF_U8(in_addr), nbytes);
 }
 
-void aSetLoopImpl(ADPCM_STATE *adpcm_loop_state) {
+void aSetLoopImpl(ADPCM_STATE* adpcm_loop_state) {
     rspa.adpcm_loop_state = adpcm_loop_state;
 }
 
+// https://godbolt.org/z/eMo5ad6n6
+
+#ifndef SSE2_AVAILABLE
+
 void aADPCMdecImpl(uint8_t flags, ADPCM_STATE state) {
-    uint8_t *in = BUF_U8(rspa.in);
-    int16_t *out = BUF_S16(rspa.out);
+    uint8_t* in = BUF_U8(rspa.in);
+    int16_t* out = BUF_S16(rspa.out);
     int nbytes = ROUND_UP_32(rspa.nbytes);
     if (flags & A_INIT) {
         memset(out, 0, 16 * sizeof(int16_t));
@@ -193,9 +243,9 @@ void aADPCMdecImpl(uint8_t flags, ADPCM_STATE state) {
     out += 16;
 
     while (nbytes > 0) {
-        int shift = *in >> 4; // should be in 0..12 or 0..14
+        int shift = *in >> 4;          // should be in 0..12 or 0..14
         int table_index = *in++ & 0xf; // should be in 0..7
-        int16_t (*tbl)[8] = rspa.adpcm_table[table_index];
+        int16_t(*tbl)[8] = rspa.adpcm_table[table_index];
         int i;
 
         for (i = 0; i < 2; i++) {
@@ -221,15 +271,117 @@ void aADPCMdecImpl(uint8_t flags, ADPCM_STATE state) {
     memcpy(state, out - 16, 16 * sizeof(int16_t));
 }
 
+#else
+
+static uint16_t lower_bit[] = {
+    0xf,
+    0xf,
+    0xf,
+    0xf,
+};
+
+void aADPCMdecImpl(uint8_t flags, ADPCM_STATE state) {
+    uint8_t* in = BUF_U8(rspa.in);
+    int16_t* out = BUF_S16(rspa.out);
+    int nbytes = ROUND_UP_32(rspa.nbytes);
+    if (flags & A_INIT) {
+        memset(out, 0, 16 * sizeof(int16_t));
+    } else if (flags & A_LOOP) {
+        memcpy(out, rspa.adpcm_loop_state, 16 * sizeof(int16_t));
+    } else {
+        memcpy(out, state, 16 * sizeof(int16_t));
+    }
+    out += 16;
+
+    __m128i mask = _mm_loadl_epi64((__m128i*) lower_bit);
+
+    while (nbytes > 0) {
+        int shift = *in >> 4; // should be in 0..12 or 0..14
+        __m128i shift_vec = _mm_set1_epi16(shift);
+        int table_index = *in++ & 0xf; // should be in 0..7
+        int16_t(*tbl)[8] = rspa.adpcm_table[table_index];
+
+        for (int i = 0; i < 2; i++) {
+            int16_t ins[8];
+            int16_t prev1 = out[-1];
+            int16_t prev2 = out[-2];
+            __m128i prev1_vec = _mm_set1_epi16(prev1);
+            __m128i prev2_vec = _mm_set1_epi16(prev2);
+
+            __m128i ins_vec = _mm_loadu_si32((__m128i*) in);
+            ins_vec = _mm_unpacklo_epi8(ins_vec, _mm_setzero_si128());
+            __m128i in_vec_up4bit = _mm_srli_epi16(ins_vec, 4);
+            __m128i in_vec_lower4bit = _mm_and_si128(ins_vec, mask);
+            ins_vec = _mm_unpacklo_epi16(in_vec_up4bit, in_vec_lower4bit);
+            ins_vec = _mm_slli_epi16(ins_vec, 12);
+            ins_vec = _mm_srai_epi16(ins_vec, 12);
+            ins_vec = _mm_slli_epi16(ins_vec, shift);
+            _mm_storeu_si128((__m128i*) ins, ins_vec);
+
+            in += 4;
+            for (int j = 0; j < 2; j++) {
+                __m128i tbl0_vec = _mm_loadu_si64((__m128i*) (tbl[0] + (j * 4)));
+                __m128i tbl1_vec = _mm_loadu_si64((__m128i*) (tbl[1] + (j * 4)));
+
+                m256i res;
+                res.lo = _mm_mullo_epi16(tbl0_vec, prev2_vec);
+                res.hi = _mm_mulhi_epi16(tbl0_vec, prev2_vec);
+
+                tbl0_vec = _mm_unpacklo_epi16(res.lo, res.hi);
+
+                res.lo = _mm_mullo_epi16(tbl1_vec, prev1_vec);
+                res.hi = _mm_mulhi_epi16(tbl1_vec, prev1_vec);
+
+                tbl1_vec = _mm_unpacklo_epi16(res.lo, res.hi);
+                __m128i acc_vec = _mm_add_epi32(tbl0_vec, tbl1_vec);
+
+                __m128i shift_ins = _mm_srai_epi32(j ? _mm_unpackhi_epi16(_mm_setzero_si128(), ins_vec)
+                                                     : _mm_unpacklo_epi16(_mm_setzero_si128(), ins_vec),
+                                                   5);
+                acc_vec = _mm_add_epi32(acc_vec, shift_ins);
+
+                tbl1_vec = _mm_loadu_si128((__m128i*) tbl[1]);
+                if (j == 0) {
+                    tbl1_vec = _mm_slli_si128(tbl1_vec, (1 - 0) * 8 + 2);
+                } else {
+                    tbl1_vec = _mm_slli_si128(tbl1_vec, (1 - 1) * 8 + 2);
+                }
+                for (int k = 0; k < ((j + 1) * 4); k++) {
+                    __m128i ins_vec2 = _mm_set1_epi16(ins[k]);
+                    res.lo = _mm_mullo_epi16(tbl1_vec, ins_vec2);
+                    res.hi = _mm_mulhi_epi16(tbl1_vec, ins_vec2);
+
+                    __m128i mult = _mm_unpackhi_epi16(res.lo, res.hi);
+                    acc_vec = _mm_add_epi32(acc_vec, mult);
+                    tbl1_vec = _mm_slli_si128(tbl1_vec, 2);
+                }
+
+                acc_vec = _mm_srai_epi32(acc_vec, 11);
+                acc_vec = _mm_packs_epi32(acc_vec, _mm_setzero_si128());
+                _mm_storeu_si64((__m128*) out, acc_vec);
+                out += 4;
+            }
+        }
+        nbytes -= 16 * sizeof(int16_t);
+    }
+    memcpy(state, out - 16, 16 * sizeof(int16_t));
+}
+
+#endif
+
+// https://godbolt.org/z/jsYM3zooP
+
+#ifndef SSE2_AVAILABLE
+
 void aResampleImpl(uint8_t flags, uint16_t pitch, RESAMPLE_STATE state) {
     int16_t tmp[32];
-    int16_t *in_initial = BUF_S16(rspa.in);
-    int16_t *in = in_initial;
-    int16_t *out = BUF_S16(rspa.out);
+    int16_t* in_initial = BUF_S16(rspa.in);
+    int16_t* in = in_initial;
+    int16_t* out = BUF_S16(rspa.out);
     int nbytes = ROUND_UP_16(rspa.nbytes);
     uint32_t pitch_accumulator;
     int i;
-    int16_t *tbl;
+    int16_t* tbl;
     int32_t sample;
 
     if (flags & A_INIT) {
@@ -242,16 +394,14 @@ void aResampleImpl(uint8_t flags, uint16_t pitch, RESAMPLE_STATE state) {
         in -= tmp[5] / sizeof(int16_t);
     }
     in -= 4;
-    pitch_accumulator = (uint16_t)tmp[4];
+    pitch_accumulator = (uint16_t) tmp[4];
     memcpy(in, tmp, 4 * sizeof(int16_t));
 
     do {
         for (i = 0; i < 8; i++) {
             tbl = resample_table[pitch_accumulator * 64 >> 16];
-            sample = ((in[0] * tbl[0] + 0x4000) >> 15) +
-                     ((in[1] * tbl[1] + 0x4000) >> 15) +
-                     ((in[2] * tbl[2] + 0x4000) >> 15) +
-                     ((in[3] * tbl[3] + 0x4000) >> 15);
+            sample = ((in[0] * tbl[0] + 0x4000) >> 15) + ((in[1] * tbl[1] + 0x4000) >> 15) +
+                     ((in[2] * tbl[2] + 0x4000) >> 15) + ((in[3] * tbl[3] + 0x4000) >> 15);
             *out++ = clamp16(sample);
 
             pitch_accumulator += (pitch << 1);
@@ -261,7 +411,170 @@ void aResampleImpl(uint8_t flags, uint16_t pitch, RESAMPLE_STATE state) {
         nbytes -= 8 * sizeof(int16_t);
     } while (nbytes > 0);
 
-    state[4] = (int16_t)pitch_accumulator;
+    state[4] = (int16_t) pitch_accumulator;
+    memcpy(state, in, 4 * sizeof(int16_t));
+    i = (in - in_initial + 4) & 7;
+    in -= i;
+    if (i != 0) {
+        i = -8 - i;
+    }
+    state[5] = i;
+    memcpy(state + 8, in, 8 * sizeof(int16_t));
+}
+
+#else
+
+static const ALIGN_ASSET(16) int32_t x4000[4] = {
+    0x4000,
+    0x4000,
+    0x4000,
+    0x4000,
+};
+
+static void mm128_transpose(__m128i* r0, __m128i* r1, __m128i* r2, __m128i* r3) {
+    __m128 tmp0, tmp1, tmp2, tmp3;
+    __m128 row0, row1, row2, row3;
+
+    row0 = _mm_castsi128_ps(*r0);
+    row1 = _mm_castsi128_ps(*r1);
+    row2 = _mm_castsi128_ps(*r2);
+    row3 = _mm_castsi128_ps(*r3);
+
+    tmp0 = _mm_shuffle_ps(row0, row1, _MM_SHUFFLE(2, 0, 2, 0)); // 0 2 4 6
+    tmp1 = _mm_shuffle_ps(row0, row1, _MM_SHUFFLE(3, 1, 3, 1)); // 1 3 5 7
+    tmp2 = _mm_shuffle_ps(row2, row3, _MM_SHUFFLE(2, 0, 2, 0)); // 8 a c e
+    tmp3 = _mm_shuffle_ps(row2, row3, _MM_SHUFFLE(3, 1, 3, 1)); // 9 b d f
+
+    row0 = _mm_shuffle_ps(tmp0, tmp2, _MM_SHUFFLE(2, 0, 2, 0)); // 0 4 8 c
+    row1 = _mm_shuffle_ps(tmp1, tmp3, _MM_SHUFFLE(2, 0, 2, 0)); // 1 5 9 d
+    row2 = _mm_shuffle_ps(tmp0, tmp2, _MM_SHUFFLE(3, 1, 3, 1)); // 2 6 a e
+    row3 = _mm_shuffle_ps(tmp1, tmp3, _MM_SHUFFLE(3, 1, 3, 1)); // 3 7 b f
+
+    *r0 = _mm_castps_si128(row0);
+    *r1 = _mm_castps_si128(row1);
+    *r2 = _mm_castps_si128(row2);
+    *r3 = _mm_castps_si128(row3);
+}
+
+static __m128i move_two_4x16(int16_t* a, int16_t* b) {
+    return _mm_set_epi64(_mm_movepi64_pi64(_mm_loadl_epi64((__m128i*) a)),
+                         _mm_movepi64_pi64(_mm_loadl_epi64((__m128i*) b)));
+}
+
+void aResampleImpl(uint8_t flags, uint16_t pitch, RESAMPLE_STATE state) {
+    int16_t tmp[32];
+    int16_t* in_initial = BUF_S16(rspa.in);
+    int16_t* in = in_initial;
+    int16_t* out = BUF_S16(rspa.out);
+    int nbytes = ROUND_UP_16(rspa.nbytes);
+    uint32_t pitch_accumulator;
+    int i;
+
+    if (flags & A_INIT) {
+        memset(tmp, 0, 5 * sizeof(int16_t));
+    } else {
+        memcpy(tmp, state, 16 * sizeof(int16_t));
+    }
+    if (flags & 2) {
+        memcpy(in - 8, tmp + 8, 8 * sizeof(int16_t));
+        in -= tmp[5] / sizeof(int16_t);
+    }
+    in -= 4;
+    pitch_accumulator = (uint16_t) tmp[4];
+    memcpy(in, tmp, 4 * sizeof(int16_t));
+
+    __m128i x4000Vec = _mm_load_si128((__m128i*) x4000);
+
+    do {
+        for (i = 0; i < 2; i++) {
+            int16_t* tbl0 = resample_table[pitch_accumulator * 64 >> 16];
+
+            int16_t* in0 = in;
+
+            pitch_accumulator += (pitch << 1);
+            in += pitch_accumulator >> 16;
+            pitch_accumulator %= 0x10000;
+
+            int16_t* tbl1 = resample_table[pitch_accumulator * 64 >> 16];
+
+            int16_t* in1 = in;
+
+            pitch_accumulator += (pitch << 1);
+            in += pitch_accumulator >> 16;
+            pitch_accumulator %= 0x10000;
+
+            int16_t* tbl2 = resample_table[pitch_accumulator * 64 >> 16];
+
+            int16_t* in2 = in;
+
+            pitch_accumulator += (pitch << 1);
+            in += pitch_accumulator >> 16;
+            pitch_accumulator %= 0x10000;
+
+            int16_t* tbl3 = resample_table[pitch_accumulator * 64 >> 16];
+
+            int16_t* in3 = in;
+
+            pitch_accumulator += (pitch << 1);
+            in += pitch_accumulator >> 16;
+            pitch_accumulator %= 0x10000;
+
+            __m128i vec_in0 = move_two_4x16(in1, in0);
+
+            __m128i vec_tbl0 = move_two_4x16(tbl1, tbl0);
+
+            __m128i vec_in1 = move_two_4x16(in3, in2);
+
+            __m128i vec_tbl1 = move_two_4x16(tbl3, tbl2);
+
+            // we multiply in by tbl
+
+            m256i res;
+            res.lo = _mm_mullo_epi16(vec_in0, vec_tbl0);
+            res.hi = _mm_mulhi_epi16(vec_in0, vec_tbl0);
+
+            __m128i out0_vec = _mm_unpacklo_epi16(res.lo, res.hi);
+            __m128i out1_vec = _mm_unpackhi_epi16(res.lo, res.hi);
+
+            res.lo = _mm_mullo_epi16(vec_in1, vec_tbl1);
+            res.hi = _mm_mulhi_epi16(vec_in1, vec_tbl1);
+
+            __m128i out2_vec = _mm_unpacklo_epi16(res.lo, res.hi);
+            __m128i out3_vec = _mm_unpackhi_epi16(res.lo, res.hi);
+
+            // transpose to more easily make a sum at the end
+
+            mm128_transpose(&out0_vec, &out1_vec, &out2_vec, &out3_vec);
+
+            // add 0x4000
+
+            out0_vec = _mm_add_epi32(out0_vec, x4000Vec);
+            out1_vec = _mm_add_epi32(out1_vec, x4000Vec);
+            out2_vec = _mm_add_epi32(out2_vec, x4000Vec);
+            out3_vec = _mm_add_epi32(out3_vec, x4000Vec);
+
+            // shift by 15
+
+            out0_vec = _mm_srai_epi32(out0_vec, 15);
+            out1_vec = _mm_srai_epi32(out1_vec, 15);
+            out2_vec = _mm_srai_epi32(out2_vec, 15);
+            out3_vec = _mm_srai_epi32(out3_vec, 15);
+
+            // sum all to make sample
+            __m128i sample_vec = _mm_add_epi32(_mm_add_epi32(_mm_add_epi32(out0_vec, out1_vec), out2_vec), out3_vec);
+
+            // at the end we do this below but four time
+            // sample = ((in[0] * tbl[0] + 0x4000) >> 15) + ((in[1] * tbl[1] + 0x4000) >> 15) +
+            //          ((in[2] * tbl[2] + 0x4000) >> 15) + ((in[3] * tbl[3] + 0x4000) >> 15);
+            sample_vec = _mm_packs_epi32(sample_vec, _mm_setzero_si128());
+            _mm_storeu_si64(out, sample_vec);
+
+            out += 4;
+        }
+        nbytes -= 8 * sizeof(int16_t);
+    } while (nbytes > 0);
+
+    state[4] = (int16_t) pitch_accumulator;
     memcpy(state, in, 4 * sizeof(int16_t));
     i = (in - in_initial + 4) & 7;
     in -= i;
@@ -272,8 +585,10 @@ void aResampleImpl(uint8_t flags, uint16_t pitch, RESAMPLE_STATE state) {
     memcpy(state + 8, in, 8 * sizeof(int16_t));
 }
 
+#endif
+
 void aEnvSetup1Impl(uint8_t initial_vol_wet, uint16_t rate_wet, uint16_t rate_left, uint16_t rate_right) {
-    rspa.vol_wet = (uint16_t)(initial_vol_wet << 8);
+    rspa.vol_wet = (uint16_t) (initial_vol_wet << 8);
     rspa.rate_wet = 0;
     rspa.rate[0] = rate_left;
     rspa.rate[1] = rate_right;
@@ -284,31 +599,35 @@ void aEnvSetup2Impl(uint16_t initial_vol_left, uint16_t initial_vol_right) {
     rspa.vol[1] = initial_vol_right;
 }
 
-void aEnvMixerImpl(uint16_t in_addr, uint16_t n_samples, bool swap_reverb,
-                   bool neg_left, bool neg_right,
-                   uint16_t dry_left_addr, uint16_t dry_right_addr,
-                   uint16_t wet_left_addr, uint16_t wet_right_addr)
-{
+// https://godbolt.org/z/ohhbY96En
+
+#ifndef SSE2_AVAILABLE
+
+void aEnvMixerImpl(uint16_t in_addr, uint16_t n_samples, bool swap_reverb, bool neg_left, bool neg_right,
+                   uint16_t dry_left_addr, uint16_t dry_right_addr, uint16_t wet_left_addr, uint16_t wet_right_addr) {
     swap_reverb = false;
-    int16_t *in = BUF_S16(in_addr);
-    int16_t *dry[2] = {BUF_S16(dry_left_addr), BUF_S16(dry_right_addr)};
-    int16_t *wet[2] = {BUF_S16(wet_left_addr), BUF_S16(wet_right_addr)};
-    int16_t negs[2] = {neg_left ? -1 : 0, neg_right ? -1 : 0};
-    int swapped[2] = {swap_reverb ? 1 : 0, swap_reverb ? 0 : 1};
+    int16_t* in = BUF_S16(in_addr);
+    int16_t* dry[2] = { BUF_S16(dry_left_addr), BUF_S16(dry_right_addr) };
+    int16_t* wet[2] = { BUF_S16(wet_left_addr), BUF_S16(wet_right_addr) };
+    int16_t negs[2] = { neg_left ? -1 : 0, neg_right ? -1 : 0 };
+    int swapped[2] = { swap_reverb ? 1 : 0, swap_reverb ? 0 : 1 };
     int n = ROUND_UP_16(n_samples);
 
-    uint16_t vols[2] = {rspa.vol[0], rspa.vol[1]};
-    uint16_t rates[2] = {rspa.rate[0], rspa.rate[1]};
+    uint16_t vols[2] = { rspa.vol[0], rspa.vol[1] };
+    uint16_t rates[2] = { rspa.rate[0], rspa.rate[1] };
     uint16_t vol_wet = rspa.vol_wet;
     uint16_t rate_wet = rspa.rate_wet;
 
     do {
         for (int i = 0; i < 8; i++) {
-            int16_t samples[2] = {*in, *in}; in++;
+            int16_t samples[2] = { *in, *in };
+            in++;
             for (int j = 0; j < 2; j++) {
                 samples[j] = (samples[j] * vols[j] >> 16) ^ negs[j];
-                *dry[j] = clamp16(*dry[j] + samples[j]); dry[j]++;
-                *wet[j] = clamp16(*wet[j] + (samples[swapped[j]] * vol_wet >> 16)); wet[j]++;
+                *dry[j] = clamp16(*dry[j] + samples[j]);
+                dry[j]++;
+                *wet[j] = clamp16(*wet[j] + (samples[swapped[j]] * vol_wet >> 16));
+                wet[j]++;
             }
         }
         vols[0] += rates[0];
@@ -319,10 +638,68 @@ void aEnvMixerImpl(uint16_t in_addr, uint16_t n_samples, bool swap_reverb,
     } while (n > 0);
 }
 
+#else
+
+void aEnvMixerImpl(uint16_t in_addr, uint16_t n_samples, bool swap_reverb, bool neg_left, bool neg_right,
+                   uint16_t dry_left_addr, uint16_t dry_right_addr, uint16_t wet_left_addr, uint16_t wet_right_addr) {
+    swap_reverb = false;
+    int16_t* in = BUF_S16(in_addr);
+    int16_t* dry[2] = { BUF_S16(dry_left_addr), BUF_S16(dry_right_addr) };
+    int16_t* wet[2] = { BUF_S16(wet_left_addr), BUF_S16(wet_right_addr) };
+    int16_t negs[2] = { neg_left ? -1 : 0, neg_right ? -1 : 0 };
+    int n = ROUND_UP_16(n_samples);
+    const int n_aligned = n - (n % 8);
+
+    uint16_t vols[2] = { rspa.vol[0], rspa.vol[1] };
+    uint16_t rates[2] = { rspa.rate[0], rspa.rate[1] };
+    uint16_t vol_wet = rspa.vol_wet;
+    uint16_t rate_wet = rspa.rate_wet;
+
+    const __m128i* in_ptr = (__m128i*) in;
+    const __m128i* d_ptr[2] = { (__m128i*) dry[0], (__m128i*) dry[1] };
+    const __m128i* w_ptr[2] = { (__m128i*) wet[0], (__m128i*) wet[1] };
+
+    // Aligned loop
+    for (int N = 0; N < n_aligned; N += 8) {
+
+        // Init vectors
+        const __m128i in_channels = _mm_loadu_si128(in_ptr++);
+        __m128i d[2] = { _mm_loadu_si128(d_ptr[0]), _mm_loadu_si128(d_ptr[1]) };
+        __m128i w[2] = { _mm_loadu_si128(w_ptr[0]), _mm_loadu_si128(w_ptr[1]) };
+
+        // Compute base samples
+        // sample = ((in * vols) >> 16) ^ negs
+        __m128i s[2] = { _mm_xor_si128(_mm_mulhi_epi16(in_channels, _mm_set1_epi16(vols[0])), _mm_set1_epi16(negs[0])),
+                         _mm_xor_si128(_mm_mulhi_epi16(in_channels, _mm_set1_epi16(vols[1])),
+                                       _mm_set1_epi16(negs[1])) };
+
+        // Compute left swapped samples
+        // (sample * vol_wet) >> 16) ^ negs
+        __m128i ss[2] = {
+            _mm_mulhi_epi16(s[swap_reverb], _mm_set1_epi16(vol_wet)),
+            _mm_mulhi_epi16(s[!swap_reverb], _mm_set1_epi16(vol_wet)),
+        };
+
+        // Store values to buffers
+        for (int j = 0; j < 2; j++) {
+            _mm_storeu_si128((__m128i*) d_ptr[j]++, _mm_adds_epi16(s[j], d[j]));
+            _mm_storeu_si128((__m128i*) w_ptr[j]++, _mm_adds_epi16(ss[j], w[j]));
+            vols[j] += rates[j];
+        }
+        vol_wet += rate_wet;
+    }
+}
+
+#endif
+
+// https://godbolt.org/z/9a1qWvTee
+
+#ifndef SSE2_AVAILABLE
+
 void aMixImpl(int16_t gain, uint16_t in_addr, uint16_t out_addr, uint16_t count) {
     int nbytes = ROUND_UP_32(ROUND_DOWN_16(count));
-    int16_t *in = BUF_S16(in_addr);
-    int16_t *out = BUF_S16(out_addr);
+    int16_t* in = BUF_S16(in_addr);
+    int16_t* out = BUF_S16(out_addr);
     int i;
     int32_t sample;
 
@@ -346,9 +723,74 @@ void aMixImpl(int16_t gain, uint16_t in_addr, uint16_t out_addr, uint16_t count)
     }
 }
 
+#else
+
+static const ALIGN_ASSET(16) int16_t x7fff[8] = {
+    0x7FFF, 0x7FFF, 0x7FFF, 0x7FFF, 0x7FFF, 0x7FFF, 0x7FFF, 0x7FFF,
+};
+
+void aMixImpl(int16_t gain, uint16_t in_addr, uint16_t out_addr, uint16_t count) {
+    int nbytes = ROUND_UP_32(ROUND_DOWN_16(count));
+    int16_t* in = BUF_S16(in_addr);
+    int16_t* out = BUF_S16(out_addr);
+    int i;
+    int32_t sample;
+
+    if (gain == -0x8000) {
+        while (nbytes > 0) {
+            for (unsigned int i = 0; i < 2; i++) {
+                __m128i outVec = _mm_loadu_si128((__m128i*) out);
+                __m128i inVec = _mm_loadu_si128((__m128i*) in);
+                __m128i subsVec = _mm_subs_epi16(outVec, inVec);
+                _mm_storeu_si128((__m128i*) out, subsVec);
+                nbytes -= 8 * sizeof(int16_t);
+                in += 8;
+                out += 8;
+            }
+        }
+    }
+
+    __m128i x7fffVec = _mm_load_si128((__m128i*) x7fff);
+    __m128i x4000Vec = _mm_load_si128((__m128i*) x4000);
+    __m128i gainVec = _mm_set1_epi16(gain);
+
+    while (nbytes > 0) {
+        for (i = 0; i < 2; i++) {
+            // Load input and output data into vectors
+            __m128i outVec = _mm_loadu_si128((__m128i*) out);
+            __m128i inVec = _mm_loadu_si128((__m128i*) in);
+            // Multiply `out` by `0x7FFF` producing 32 bit results, and store the upper and lower bits in each vector.
+            // Equivalent to `out[0..8] * 0x7FFF`
+            m256i outx7fff = m256i_mul_epi16(outVec, x7fffVec);
+            // Same as above but for in and gain. Equivalent to `in[0..8] * gain`
+            m256i inxGain = m256i_mul_epi16(inVec, gainVec);
+            in += 8;
+
+            // Now we have 4 32 bit elements.  Continue the calculaton per the reference implementation.
+            // We already did out + 0x7fff and in * gain.
+            // *out * 0x7fff + *in++ * gain is the final result of these two calculations.
+            m256i addVec = m256i_add_m256i_epi32(outx7fff, inxGain);
+            // Add 0x4000 to each element
+            addVec = m256i_add_m128i_epi32(addVec, x4000Vec);
+            // Shift each element over by 15
+            m256i shiftedVec = m256i_srai(addVec, 15);
+            // Convert each 32 bit element to 16 bit with saturation (clamp) and store in `outVec`
+            outVec = m256i_clamp_to_m128i(shiftedVec);
+            // Write the final vector back to memory
+            // The final calculation is ((out[0..8] * 0x7fff + in[0..8] * gain) + 0x4000) >> 15;
+            _mm_storeu_si128((__m128i*) out, outVec);
+            out += 8;
+        }
+
+        nbytes -= 16 * sizeof(int16_t);
+    }
+}
+
+#endif
+
 void aS8DecImpl(uint8_t flags, ADPCM_STATE state) {
-    uint8_t *in = BUF_U8(rspa.in);
-    int16_t *out = BUF_S16(rspa.out);
+    uint8_t* in = BUF_U8(rspa.in);
+    int16_t* out = BUF_S16(rspa.out);
     int nbytes = ROUND_UP_32(rspa.nbytes);
     if (flags & A_INIT) {
         memset(out, 0, 16 * sizeof(int16_t));
@@ -360,22 +802,22 @@ void aS8DecImpl(uint8_t flags, ADPCM_STATE state) {
     out += 16;
 
     while (nbytes > 0) {
-        *out++ = (int16_t)(*in++ << 8);
-        *out++ = (int16_t)(*in++ << 8);
-        *out++ = (int16_t)(*in++ << 8);
-        *out++ = (int16_t)(*in++ << 8);
-        *out++ = (int16_t)(*in++ << 8);
-        *out++ = (int16_t)(*in++ << 8);
-        *out++ = (int16_t)(*in++ << 8);
-        *out++ = (int16_t)(*in++ << 8);
-        *out++ = (int16_t)(*in++ << 8);
-        *out++ = (int16_t)(*in++ << 8);
-        *out++ = (int16_t)(*in++ << 8);
-        *out++ = (int16_t)(*in++ << 8);
-        *out++ = (int16_t)(*in++ << 8);
-        *out++ = (int16_t)(*in++ << 8);
-        *out++ = (int16_t)(*in++ << 8);
-        *out++ = (int16_t)(*in++ << 8);
+        *out++ = (int16_t) (*in++ << 8);
+        *out++ = (int16_t) (*in++ << 8);
+        *out++ = (int16_t) (*in++ << 8);
+        *out++ = (int16_t) (*in++ << 8);
+        *out++ = (int16_t) (*in++ << 8);
+        *out++ = (int16_t) (*in++ << 8);
+        *out++ = (int16_t) (*in++ << 8);
+        *out++ = (int16_t) (*in++ << 8);
+        *out++ = (int16_t) (*in++ << 8);
+        *out++ = (int16_t) (*in++ << 8);
+        *out++ = (int16_t) (*in++ << 8);
+        *out++ = (int16_t) (*in++ << 8);
+        *out++ = (int16_t) (*in++ << 8);
+        *out++ = (int16_t) (*in++ << 8);
+        *out++ = (int16_t) (*in++ << 8);
+        *out++ = (int16_t) (*in++ << 8);
 
         nbytes -= 16 * sizeof(int16_t);
     }
@@ -384,27 +826,43 @@ void aS8DecImpl(uint8_t flags, ADPCM_STATE state) {
 }
 
 void aAddMixerImpl(uint16_t count, uint16_t in_addr, uint16_t out_addr) {
-    int16_t *in = BUF_S16(in_addr);
-    int16_t *out = BUF_S16(out_addr);
+    int16_t* in = BUF_S16(in_addr);
+    int16_t* out = BUF_S16(out_addr);
     int nbytes = ROUND_UP_64(ROUND_DOWN_16(count));
 
     do {
-        *out = clamp16(*out + *in++); out++;
-        *out = clamp16(*out + *in++); out++;
-        *out = clamp16(*out + *in++); out++;
-        *out = clamp16(*out + *in++); out++;
-        *out = clamp16(*out + *in++); out++;
-        *out = clamp16(*out + *in++); out++;
-        *out = clamp16(*out + *in++); out++;
-        *out = clamp16(*out + *in++); out++;
-        *out = clamp16(*out + *in++); out++;
-        *out = clamp16(*out + *in++); out++;
-        *out = clamp16(*out + *in++); out++;
-        *out = clamp16(*out + *in++); out++;
-        *out = clamp16(*out + *in++); out++;
-        *out = clamp16(*out + *in++); out++;
-        *out = clamp16(*out + *in++); out++;
-        *out = clamp16(*out + *in++); out++;
+        *out = clamp16(*out + *in++);
+        out++;
+        *out = clamp16(*out + *in++);
+        out++;
+        *out = clamp16(*out + *in++);
+        out++;
+        *out = clamp16(*out + *in++);
+        out++;
+        *out = clamp16(*out + *in++);
+        out++;
+        *out = clamp16(*out + *in++);
+        out++;
+        *out = clamp16(*out + *in++);
+        out++;
+        *out = clamp16(*out + *in++);
+        out++;
+        *out = clamp16(*out + *in++);
+        out++;
+        *out = clamp16(*out + *in++);
+        out++;
+        *out = clamp16(*out + *in++);
+        out++;
+        *out = clamp16(*out + *in++);
+        out++;
+        *out = clamp16(*out + *in++);
+        out++;
+        *out = clamp16(*out + *in++);
+        out++;
+        *out = clamp16(*out + *in++);
+        out++;
+        *out = clamp16(*out + *in++);
+        out++;
 
         nbytes -= 16 * sizeof(int16_t);
     } while (nbytes > 0);
@@ -412,7 +870,7 @@ void aAddMixerImpl(uint16_t count, uint16_t in_addr, uint16_t out_addr) {
 
 void aDuplicateImpl(uint16_t count, uint16_t in_addr, uint16_t out_addr) {
     uint8_t* in = BUF_U8(in_addr);
-    uint8_t *out = BUF_U8(out_addr);
+    uint8_t* out = BUF_U8(out_addr);
 
     uint8_t tmp[128];
     memcpy(tmp, in, 128);
@@ -423,8 +881,8 @@ void aDuplicateImpl(uint16_t count, uint16_t in_addr, uint16_t out_addr) {
 }
 
 void aDMEMMove2Impl(uint8_t t, uint16_t in_addr, uint16_t out_addr, uint16_t count) {
-    uint8_t *in = BUF_U8(in_addr);
-    uint8_t *out = BUF_U8(out_addr);
+    uint8_t* in = BUF_U8(in_addr);
+    uint8_t* out = BUF_U8(out_addr);
     int nbytes = ROUND_UP_32(count);
 
     do {
@@ -435,68 +893,88 @@ void aDMEMMove2Impl(uint8_t t, uint16_t in_addr, uint16_t out_addr, uint16_t cou
 }
 
 void aResampleZohImpl(uint16_t pitch, uint16_t start_fract) {
-    int16_t *in = BUF_S16(rspa.in);
-    int16_t *out = BUF_S16(rspa.out);
+    int16_t* in = BUF_S16(rspa.in);
+    int16_t* out = BUF_S16(rspa.out);
     int nbytes = ROUND_UP_8(rspa.nbytes);
     uint32_t pos = start_fract;
     uint32_t pitch_add = pitch << 2;
 
     do {
-        *out++ = in[pos >> 17]; pos += pitch_add;
-        *out++ = in[pos >> 17]; pos += pitch_add;
-        *out++ = in[pos >> 17]; pos += pitch_add;
-        *out++ = in[pos >> 17]; pos += pitch_add;
+        *out++ = in[pos >> 17];
+        pos += pitch_add;
+        *out++ = in[pos >> 17];
+        pos += pitch_add;
+        *out++ = in[pos >> 17];
+        pos += pitch_add;
+        *out++ = in[pos >> 17];
+        pos += pitch_add;
 
         nbytes -= 4 * sizeof(int16_t);
     } while (nbytes > 0);
 }
 
 void aDownsampleHalfImpl(uint16_t n_samples, uint16_t in_addr, uint16_t out_addr) {
-    int16_t *in = BUF_S16(in_addr);
-    int16_t *out = BUF_S16(out_addr);
+    int16_t* in = BUF_S16(in_addr);
+    int16_t* out = BUF_S16(out_addr);
     int n = ROUND_UP_8(n_samples);
 
     do {
-        *out++ = *in++; in++;
-        *out++ = *in++; in++;
-        *out++ = *in++; in++;
-        *out++ = *in++; in++;
-        *out++ = *in++; in++;
-        *out++ = *in++; in++;
-        *out++ = *in++; in++;
-        *out++ = *in++; in++;
+        *out++ = *in++;
+        in++;
+        *out++ = *in++;
+        in++;
+        *out++ = *in++;
+        in++;
+        *out++ = *in++;
+        in++;
+        *out++ = *in++;
+        in++;
+        *out++ = *in++;
+        in++;
+        *out++ = *in++;
+        in++;
+        *out++ = *in++;
+        in++;
 
         n -= 8;
     } while (n > 0);
 }
 
 void aInterlImpl(uint16_t in_addr, uint16_t out_addr, uint16_t n_samples) {
-    int16_t *in = BUF_S16(in_addr);
-    int16_t *out = BUF_S16(out_addr);
+    int16_t* in = BUF_S16(in_addr);
+    int16_t* out = BUF_S16(out_addr);
     int n = ROUND_UP_8(n_samples);
 
     do {
-        *out++ = *in++; in++;
-        *out++ = *in++; in++;
-        *out++ = *in++; in++;
-        *out++ = *in++; in++;
-        *out++ = *in++; in++;
-        *out++ = *in++; in++;
-        *out++ = *in++; in++;
-        *out++ = *in++; in++;
+        *out++ = *in++;
+        in++;
+        *out++ = *in++;
+        in++;
+        *out++ = *in++;
+        in++;
+        *out++ = *in++;
+        in++;
+        *out++ = *in++;
+        in++;
+        *out++ = *in++;
+        in++;
+        *out++ = *in++;
+        in++;
+        *out++ = *in++;
+        in++;
 
         n -= 8;
     } while (n > 0);
 }
 
-void aFilterImpl(uint8_t flags, uint16_t count_or_buf, int16_t *state_or_filter) {
+void aFilterImpl(uint8_t flags, uint16_t count_or_buf, int16_t* state_or_filter) {
     if (flags > A_INIT) {
         rspa.filter_count = ROUND_UP_16(count_or_buf);
         memcpy(rspa.filter, state_or_filter, sizeof(rspa.filter));
     } else {
         int16_t tmp[16], tmp2[8];
         int count = rspa.filter_count;
-        int16_t *buf = BUF_S16(count_or_buf);
+        int16_t* buf = BUF_S16(count_or_buf);
 
         if (flags == A_INIT) {
 #ifndef __clang__
@@ -524,7 +1002,7 @@ void aFilterImpl(uint8_t flags, uint16_t count_or_buf, int16_t *state_or_filter)
                 for (int j = 0; j < 8; j++) {
                     sample += tmp[i + j] * rspa.filter[7 - j];
                 }
-                buf[i] = clamp16((int32_t)(sample >> 15));
+                buf[i] = clamp16((int32_t) (sample >> 15));
             }
             memcpy(tmp, tmp + 8, 8 * sizeof(int16_t));
 
@@ -538,18 +1016,26 @@ void aFilterImpl(uint8_t flags, uint16_t count_or_buf, int16_t *state_or_filter)
 }
 
 void aHiLoGainImpl(uint8_t g, uint16_t count, uint16_t addr) {
-    int16_t *samples = BUF_S16(addr);
+    int16_t* samples = BUF_S16(addr);
     int nbytes = ROUND_UP_32(count);
 
     do {
-        *samples = clamp16((*samples * g) >> 4); samples++;
-        *samples = clamp16((*samples * g) >> 4); samples++;
-        *samples = clamp16((*samples * g) >> 4); samples++;
-        *samples = clamp16((*samples * g) >> 4); samples++;
-        *samples = clamp16((*samples * g) >> 4); samples++;
-        *samples = clamp16((*samples * g) >> 4); samples++;
-        *samples = clamp16((*samples * g) >> 4); samples++;
-        *samples = clamp16((*samples * g) >> 4); samples++;
+        *samples = clamp16((*samples * g) >> 4);
+        samples++;
+        *samples = clamp16((*samples * g) >> 4);
+        samples++;
+        *samples = clamp16((*samples * g) >> 4);
+        samples++;
+        *samples = clamp16((*samples * g) >> 4);
+        samples++;
+        *samples = clamp16((*samples * g) >> 4);
+        samples++;
+        *samples = clamp16((*samples * g) >> 4);
+        samples++;
+        *samples = clamp16((*samples * g) >> 4);
+        samples++;
+        *samples = clamp16((*samples * g) >> 4);
+        samples++;
 
         nbytes -= 8;
     } while (nbytes > 0);
@@ -560,8 +1046,8 @@ void aUnkCmd3Impl(uint16_t a, uint16_t b, uint16_t c) {
 
 void aUnkCmd19Impl(uint8_t f, uint16_t count, uint16_t out_addr, uint16_t in_addr) {
     int nbytes = ROUND_UP_64(count);
-    int16_t *in = BUF_S16(in_addr + f);
-    int16_t *out = BUF_S16(out_addr);
+    int16_t* in = BUF_S16(in_addr + f);
+    int16_t* out = BUF_S16(out_addr);
     int16_t tbl[32];
 
     memcpy(tbl, in, 32 * sizeof(int16_t));
diff --git a/src/audio/playback.c b/src/audio/playback.c
index 30dcb388d..e4dddff88 100644
--- a/src/audio/playback.c
+++ b/src/audio/playback.c
@@ -229,11 +229,6 @@ void process_notes(void) {
         note = &gNotes[i];
         playbackState = (struct NotePlaybackState*) &note->priority;
         if (note->parentLayer != NO_LAYER) {
-#ifndef NO_SEGMENTED_MEMORY
-            if ((uintptr_t) playbackState->parentLayer < 0x7fffffffU) {
-                continue;
-            }
-#endif
 
 #ifdef VERSION_EU_1_0
             // Just threw these in here. They are probably wrong place and variables.