[x265] [PATCH 05/14] AArch64: Add Armv8.4 Neon DotProd implementations of filter_hps
Hari Limaye
hari.limaye at arm.com
Fri Sep 6 13:33:35 UTC 2024
Add implementations of filter_hps primitives using Neon DotProd
instructions, which are mandatory from Armv8.4.
Geomean uplift across all block sizes for chroma filters, relative to
Armv8.0 Neon implementation:
Neoverse N1: 1.277x
Neoverse N2: 1.237x
Neoverse V1: 1.168x
Neoverse V2: 1.236x
---
source/common/aarch64/filter-neon-dotprod.cpp | 142 +++++++++++++++++-
1 file changed, 139 insertions(+), 3 deletions(-)
diff --git a/source/common/aarch64/filter-neon-dotprod.cpp b/source/common/aarch64/filter-neon-dotprod.cpp
index 8247dc29a..eb42b43f2 100644
--- a/source/common/aarch64/filter-neon-dotprod.cpp
+++ b/source/common/aarch64/filter-neon-dotprod.cpp
@@ -208,6 +208,28 @@ uint8x8_t inline filter4_8_pp(uint8x16_t samples, const int8x8_t filter,
vmovn_s32(dotprod_hi));
return vqrshrun_n_s16(dotprod, IF_FILTER_PREC);
}
+
+int16x8_t inline filter4_8_ps(uint8x16_t samples, const int8x8_t filter,
+ const uint8x16x2_t tbl)
+{
+ // Transform sample range from uint8_t to int8_t for signed dot product.
+ int8x16_t samples_s8 =
+ vreinterpretq_s8_u8(vsubq_u8(samples, vdupq_n_u8(128)));
+
+ // Permute input samples for dot product.
+ // { 0, 1, 2, 3, 1, 2, 3, 4, 2, 3, 4, 5, 3, 4, 5, 6 }
+ int8x16_t perm_samples_0 = vqtbl1q_s8(samples_s8, tbl.val[0]);
+ // { 4, 5, 6, 7, 5, 6, 7, 8, 6, 7, 8, 9, 7, 8, 9, 10 }
+ int8x16_t perm_samples_1 = vqtbl1q_s8(samples_s8, tbl.val[1]);
+
+ // Correction accounting for sample range transform cancels to 0.
+ int32x4_t constant = vdupq_n_s32(0);
+ int32x4_t dotprod_lo = vdotq_lane_s32(constant, perm_samples_0, filter, 0);
+ int32x4_t dotprod_hi = vdotq_lane_s32(constant, perm_samples_1, filter, 0);
+
+ // Narrow and combine.
+ return vcombine_s16(vmovn_s32(dotprod_lo), vmovn_s32(dotprod_hi));
+}
} // Unnamed namespace.
namespace X265_NS {
@@ -512,21 +534,135 @@ void interp4_horiz_pp_dotprod(const uint8_t *src, intptr_t srcStride,
}
}
+template<int width, int height>
+void interp4_horiz_ps_dotprod(const uint8_t *src, intptr_t srcStride,
+ int16_t *dst, intptr_t dstStride, int coeffIdx,
+ int isRowExt)
+{
+ const int N_TAPS = 4;
+ int blkheight = height;
+
+ src -= N_TAPS / 2 - 1;
+ if (isRowExt)
+ {
+ src -= (N_TAPS / 2 - 1) * srcStride;
+ blkheight += N_TAPS - 1;
+ }
+
+ const uint8x16x2_t tbl = vld1q_u8_x2(dotprod_permute_tbl);
+ const int16x4_t filter_16 = vld1_s16(g_chromaFilter[coeffIdx]);
+ const int8x8_t filter = vmovn_s16(vcombine_s16(filter_16, vdup_n_s16(0)));
+
+ int row = 0;
+ for (; row + 4 <= blkheight; row += 4)
+ {
+ int col = 0;
+ for (; col + 16 <= width; col += 16)
+ {
+ uint8x16_t s_lo[4], s_hi[4];
+ load_u8x16xn<4>(src + col + 0, srcStride, s_lo);
+ load_u8x16xn<4>(src + col + 8, srcStride, s_hi);
+
+ int16x8_t d_lo[4];
+ d_lo[0] = filter4_8_ps(s_lo[0], filter, tbl);
+ d_lo[1] = filter4_8_ps(s_lo[1], filter, tbl);
+ d_lo[2] = filter4_8_ps(s_lo[2], filter, tbl);
+ d_lo[3] = filter4_8_ps(s_lo[3], filter, tbl);
+
+ int16x8_t d_hi[4];
+ d_hi[0] = filter4_8_ps(s_hi[0], filter, tbl);
+ d_hi[1] = filter4_8_ps(s_hi[1], filter, tbl);
+ d_hi[2] = filter4_8_ps(s_hi[2], filter, tbl);
+ d_hi[3] = filter4_8_ps(s_hi[3], filter, tbl);
+
+ store_s16x8xn<4>(dst + col + 0, dstStride, d_lo);
+ store_s16x8xn<4>(dst + col + 8, dstStride, d_hi);
+ }
+
+ for (; col + 8 <= width; col += 8)
+ {
+ uint8x16_t s[4];
+ load_u8x16xn<4>(src + col, srcStride, s);
+
+ int16x8_t d[4];
+ d[0] = filter4_8_ps(s[0], filter, tbl);
+ d[1] = filter4_8_ps(s[1], filter, tbl);
+ d[2] = filter4_8_ps(s[2], filter, tbl);
+ d[3] = filter4_8_ps(s[3], filter, tbl);
+
+ store_s16x8xn<4>(dst + col, dstStride, d);
+ }
+
+ // Block sizes 12xH, 6xH, 4xH, 2xH.
+ if (width % 8 != 0)
+ {
+ uint8x16_t s[4];
+ load_u8x16xn<4>(src + col, srcStride, s);
+
+ int16x8_t d[4];
+ d[0] = filter4_8_ps(s[0], filter, tbl);
+ d[1] = filter4_8_ps(s[1], filter, tbl);
+ d[2] = filter4_8_ps(s[2], filter, tbl);
+ d[3] = filter4_8_ps(s[3], filter, tbl);
+
+ const int n_store = width < 8 ? width : 4;
+ store_s16xnxm<n_store, 4>(d, dst + col, dstStride);
+ }
+
+ src += 4 * srcStride;
+ dst += 4 * dstStride;
+ }
+
+ // Process remaining rows.
+ for (; row < blkheight; ++row)
+ {
+ int col = 0;
+ for (; (col + 8) <= width; col += 8)
+ {
+ uint8x16_t s = vld1q_u8(src + col);
+
+ int16x8_t d = filter4_8_ps(s, filter, tbl);
+
+ vst1q_s16(dst + col, d);
+ }
+
+ // Block sizes 12xH, 6xH, 4xH, 2xH.
+ if (width % 8 != 0)
+ {
+ uint8x16_t s = vld1q_u8(src + col);
+
+ int16x8_t d = filter4_8_ps(s, filter, tbl);
+
+ const int n_store = width < 8 ? width : 4;
+ store_s16xnxm<n_store, 1>(&d, dst + col, dstStride);
+ }
+
+ src += srcStride;
+ dst += dstStride;
+ }
+}
+
#define LUMA_DOTPROD(W, H) \
p.pu[LUMA_ ## W ## x ## H].luma_hpp = interp8_horiz_pp_dotprod<W, H>; \
p.pu[LUMA_ ## W ## x ## H].luma_hps = interp8_horiz_ps_dotprod<W, H>;
#define CHROMA_420_DOTPROD(W, H) \
p.chroma[X265_CSP_I420].pu[CHROMA_420_ ## W ## x ## H].filter_hpp = \
- interp4_horiz_pp_dotprod<W, H>;
+ interp4_horiz_pp_dotprod<W, H>; \
+ p.chroma[X265_CSP_I420].pu[CHROMA_420_ ## W ## x ## H].filter_hps = \
+ interp4_horiz_ps_dotprod<W, H>;
#define CHROMA_422_DOTPROD(W, H) \
p.chroma[X265_CSP_I422].pu[CHROMA_422_ ## W ## x ## H].filter_hpp = \
- interp4_horiz_pp_dotprod<W, H>;
+ interp4_horiz_pp_dotprod<W, H>; \
+ p.chroma[X265_CSP_I422].pu[CHROMA_422_ ## W ## x ## H].filter_hps = \
+ interp4_horiz_ps_dotprod<W, H>;
#define CHROMA_444_DOTPROD(W, H) \
p.chroma[X265_CSP_I444].pu[LUMA_ ## W ## x ## H].filter_hpp = \
- interp4_horiz_pp_dotprod<W, H>;
+ interp4_horiz_pp_dotprod<W, H>; \
+ p.chroma[X265_CSP_I444].pu[LUMA_ ## W ## x ## H].filter_hps = \
+ interp4_horiz_ps_dotprod<W, H>;
void setupFilterPrimitives_neon_dotprod(EncoderPrimitives &p)
{
--
2.42.1
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