Add support for 10-bit AV1 encoding.

[nageru] / shared / memcpy_interleaved.cpp

diff --git a/shared/memcpy_interleaved.cpp b/shared/memcpy_interleaved.cpp
index 2de1ecec3b725498ebc6d92d298e33b332723bd3..dd7a59656608098ed451998838fcb7a713c5a6af 100644 (file)
--- a/shared/memcpy_interleaved.cpp
+++ b/shared/memcpy_interleaved.cpp
@@ -24,8 +24,22 @@ void memcpy_interleaved_slow(uint8_t *dest1, uint8_t *dest2, const uint8_t *src,
        }
 }
 
+void memcpy_interleaved_word_slow(uint16_t *dest1, uint16_t *dest2, const uint16_t *src, size_t n)
+{
+       assert(n % 2 == 0);
+       uint16_t *dptr1 = dest1;
+       uint16_t *dptr2 = dest2;
+
+       for (size_t i = 0; i < n; i += 2) {
+               *dptr1++ = *src++;
+               *dptr2++ = *src++;
+       }
+}
+
 #if HAS_MULTIVERSIONING
 
+// uint8_t version.
+
 __attribute__((target("default")))
 size_t memcpy_interleaved_fastpath_core(uint8_t *dest1, uint8_t *dest2, const uint8_t *src, const uint8_t *limit);
 
@@ -112,6 +126,100 @@ size_t memcpy_interleaved_fastpath(uint8_t *dest1, uint8_t *dest2, const uint8_t
        return consumed + memcpy_interleaved_fastpath_core(dest1, dest2, src, limit);
 }
 
+// uint16_t version.
+
+__attribute__((target("default")))
+size_t memcpy_interleaved_word_fastpath_core(uint16_t *dest1, uint16_t *dest2, const uint16_t *src, const uint16_t *limit);
+
+__attribute__((target("avx2")))
+size_t memcpy_interleaved_word_fastpath_core(uint16_t *dest1, uint16_t *dest2, const uint16_t *src, const uint16_t *limit);
+
+__attribute__((target("default")))
+size_t memcpy_interleaved_word_fastpath_core(uint16_t *dest1, uint16_t *dest2, const uint16_t *src, const uint16_t *limit)
+{
+       // No fast path supported unless we have AVX2.
+       return 0;
+}
+
+__attribute__((target("avx2")))
+size_t memcpy_interleaved_word_fastpath_core(uint16_t *dest1, uint16_t *dest2, const uint16_t *src, const uint16_t *limit)
+{
+       size_t consumed = 0;
+       const __m256i *__restrict in = (const __m256i *)src;
+       __m256i *__restrict out1 = (__m256i *)dest1;
+       __m256i *__restrict out2 = (__m256i *)dest2;
+
+       __m256i shuffle_cw = _mm256_set_epi8(
+               15, 14, 11, 10, 7, 6, 3, 2, 13, 12, 9, 8, 5, 4, 1, 0,
+               15, 14, 11, 10, 7, 6, 3, 2, 13, 12, 9, 8, 5, 4, 1, 0);
+       while (in < (const __m256i *)limit) {
+               // Note: Each element in these comments is 16 bits long (lanes are 2x128 bits).
+               __m256i data1 = _mm256_stream_load_si256(in);         // AaBbCcDd EeFfGgHh
+               __m256i data2 = _mm256_stream_load_si256(in + 1);     // IiJjKkLl MmNnOoPp
+
+               data1 = _mm256_shuffle_epi8(data1, shuffle_cw);       // ABCDabcd EFGHefgh
+               data2 = _mm256_shuffle_epi8(data2, shuffle_cw);       // IJKLijkl MNOPmnop
+
+               data1 = _mm256_permute4x64_epi64(data1, 0b11011000);  // ABCDEFGH abcdefgh
+               data2 = _mm256_permute4x64_epi64(data2, 0b11011000);  // IJKLMNOP ijklmnop
+
+               __m256i lo = _mm256_permute2x128_si256(data1, data2, 0b00100000);
+               __m256i hi = _mm256_permute2x128_si256(data1, data2, 0b00110001);
+
+               _mm256_storeu_si256(out1, lo);
+               _mm256_storeu_si256(out2, hi);
+
+               in += 2;
+               ++out1;
+               ++out2;
+               consumed += 32;
+       }
+
+       return consumed;
+}
+
+// Returns the number of bytes consumed.
+size_t memcpy_interleaved_word_fastpath(uint16_t *dest1, uint16_t *dest2, const uint16_t *src, size_t n)
+{
+       // We assume this to generally be the case, but just to be sure,
+       // drop down to the slow path.
+       if (intptr_t(dest1) % 2 != 0 || intptr_t(dest2) % 2 != 0 || intptr_t(src) % 2 != 0) {
+               return 0;
+       }
+
+       const uint16_t *limit = src + n;
+       size_t consumed = 0;
+
+       // Align end to 32 bytes.
+       limit = (const uint16_t *)(intptr_t(limit) & ~31);
+
+       if (src >= limit) {
+               return 0;
+       }
+
+       // Process [0,15] words, such that start gets aligned to 32 bytes (16 words).
+       const uint16_t *aligned_src = (const uint16_t *)(intptr_t(src + 31) & ~31);
+       if (aligned_src != src) {
+               size_t n2 = aligned_src - src;
+               memcpy_interleaved_word_slow(dest1, dest2, src, n2);
+               dest1 += n2 / 2;
+               dest2 += n2 / 2;
+               if (n2 % 2) {
+                       swap(dest1, dest2);
+               }
+               src = aligned_src;
+               consumed += n2;
+       }
+
+       // Make the length a multiple of 32 words (64 bytes).
+       if (((limit - src) % 32) != 0) {
+               limit -= 16;
+       }
+       assert(((limit - src) % 32) == 0);
+
+       return consumed + memcpy_interleaved_word_fastpath_core(dest1, dest2, src, limit);
+}
+
 #endif  // defined(HAS_MULTIVERSIONING)
 
 void memcpy_interleaved(uint8_t *dest1, uint8_t *dest2, const uint8_t *src, size_t n)
@@ -131,3 +239,21 @@ void memcpy_interleaved(uint8_t *dest1, uint8_t *dest2, const uint8_t *src, size
                memcpy_interleaved_slow(dest1, dest2, src, n);
        }
 }
+
+void memcpy_interleaved_word(uint16_t *dest1, uint16_t *dest2, const uint16_t *src, size_t n)
+{
+#if HAS_MULTIVERSIONING
+       size_t consumed = memcpy_interleaved_word_fastpath(dest1, dest2, src, n);
+       src += consumed;
+       dest1 += consumed / 2;
+       dest2 += consumed / 2;
+       if (consumed % 2) {
+               swap(dest1, dest2);
+       }
+       n -= consumed;
+#endif
+
+       if (n > 0) {
+               memcpy_interleaved_word_slow(dest1, dest2, src, n);
+       }
+}