diff options
Diffstat (limited to '')
-rw-r--r-- | third_party/aom/av1/common/arm/convolve_neon_i8mm.c | 702 |
1 files changed, 702 insertions, 0 deletions
diff --git a/third_party/aom/av1/common/arm/convolve_neon_i8mm.c b/third_party/aom/av1/common/arm/convolve_neon_i8mm.c new file mode 100644 index 0000000000..bbcd6f201a --- /dev/null +++ b/third_party/aom/av1/common/arm/convolve_neon_i8mm.c @@ -0,0 +1,702 @@ +/* + * Copyright (c) 2023, Alliance for Open Media. All rights reserved + * + * This source code is subject to the terms of the BSD 2 Clause License and + * the Alliance for Open Media Patent License 1.0. If the BSD 2 Clause License + * was not distributed with this source code in the LICENSE file, you can + * obtain it at www.aomedia.org/license/software. If the Alliance for Open + * Media Patent License 1.0 was not distributed with this source code in the + * PATENTS file, you can obtain it at www.aomedia.org/license/patent. + */ + +#include <arm_neon.h> + +#include "config/aom_config.h" +#include "config/av1_rtcd.h" + +#include "aom_dsp/aom_dsp_common.h" +#include "aom_dsp/arm/mem_neon.h" +#include "aom_ports/mem.h" +#include "av1/common/arm/convolve_neon.h" +#include "av1/common/convolve.h" +#include "av1/common/filter.h" + +DECLARE_ALIGNED(16, static const uint8_t, dot_prod_permute_tbl[48]) = { + 0, 1, 2, 3, 1, 2, 3, 4, 2, 3, 4, 5, 3, 4, 5, 6, + 4, 5, 6, 7, 5, 6, 7, 8, 6, 7, 8, 9, 7, 8, 9, 10, + 8, 9, 10, 11, 9, 10, 11, 12, 10, 11, 12, 13, 11, 12, 13, 14 +}; + +static INLINE int16x4_t convolve12_4_x(uint8x16_t samples, + const int8x16_t filter, + const uint8x16x3_t permute_tbl, + const int32x4_t horiz_const) { + uint8x16_t permuted_samples[3]; + int32x4_t sum; + + // Permute samples ready for dot product. + // { 0, 1, 2, 3, 1, 2, 3, 4, 2, 3, 4, 5, 3, 4, 5, 6 } + permuted_samples[0] = vqtbl1q_u8(samples, permute_tbl.val[0]); + // { 4, 5, 6, 7, 5, 6, 7, 8, 6, 7, 8, 9, 7, 8, 9, 10 } + permuted_samples[1] = vqtbl1q_u8(samples, permute_tbl.val[1]); + // { 8, 9, 10, 11, 9, 10, 11, 12, 10, 11, 12, 13, 11, 12, 13, 14 } + permuted_samples[2] = vqtbl1q_u8(samples, permute_tbl.val[2]); + + // First 4 output values. + sum = vusdotq_laneq_s32(horiz_const, permuted_samples[0], filter, 0); + sum = vusdotq_laneq_s32(sum, permuted_samples[1], filter, 1); + sum = vusdotq_laneq_s32(sum, permuted_samples[2], filter, 2); + + return vqrshrn_n_s32(sum, FILTER_BITS); +} + +static INLINE uint8x8_t convolve12_8_x(uint8x16_t samples[2], + const int8x16_t filter, + const uint8x16x3_t permute_tbl, + const int32x4_t horiz_const) { + uint8x16_t permuted_samples[4]; + int32x4_t sum[2]; + + // Permute samples ready for dot product. + // { 0, 1, 2, 3, 1, 2, 3, 4, 2, 3, 4, 5, 3, 4, 5, 6 } + permuted_samples[0] = vqtbl1q_u8(samples[0], permute_tbl.val[0]); + // { 4, 5, 6, 7, 5, 6, 7, 8, 6, 7, 8, 9, 7, 8, 9, 10 } + permuted_samples[1] = vqtbl1q_u8(samples[0], permute_tbl.val[1]); + // { 8, 9, 10, 11, 9, 10, 11, 12, 10, 11, 12, 13, 11, 12, 13, 14 } + permuted_samples[2] = vqtbl1q_u8(samples[0], permute_tbl.val[2]); + // {12, 13, 14, 15, 13, 14, 15, 16, 14, 15, 16, 17, 15, 16, 17, 18 } + permuted_samples[3] = vqtbl1q_u8(samples[1], permute_tbl.val[2]); + + // First 4 output values. + sum[0] = vusdotq_laneq_s32(horiz_const, permuted_samples[0], filter, 0); + sum[0] = vusdotq_laneq_s32(sum[0], permuted_samples[1], filter, 1); + sum[0] = vusdotq_laneq_s32(sum[0], permuted_samples[2], filter, 2); + // Second 4 output values. + sum[1] = vusdotq_laneq_s32(horiz_const, permuted_samples[1], filter, 0); + sum[1] = vusdotq_laneq_s32(sum[1], permuted_samples[2], filter, 1); + sum[1] = vusdotq_laneq_s32(sum[1], permuted_samples[3], filter, 2); + + // Narrow and re-pack. + int16x8_t sum_s16 = vcombine_s16(vqrshrn_n_s32(sum[0], FILTER_BITS), + vqrshrn_n_s32(sum[1], FILTER_BITS)); + return vqmovun_s16(sum_s16); +} + +static INLINE void convolve_x_sr_12tap_neon_i8mm(const uint8_t *src, + int src_stride, uint8_t *dst, + int dst_stride, int w, int h, + const int16_t *x_filter_ptr) { + const int16x8_t filter_0_7 = vld1q_s16(x_filter_ptr); + const int16x4_t filter_8_11 = vld1_s16(x_filter_ptr + 8); + const int16x8_t filter_8_15 = vcombine_s16(filter_8_11, vdup_n_s16(0)); + const int8x16_t filter = + vcombine_s8(vmovn_s16(filter_0_7), vmovn_s16(filter_8_15)); + + // Special case the following no-op filter as 128 won't fit into the + // 8-bit signed dot-product instruction: + // { 0, 0, 0, 0, 0, 128, 0, 0, 0, 0, 0, 0 } + if (vgetq_lane_s16(filter_0_7, 5) == 128) { + // Undo the horizontal offset in the calling function. + src += 5; + + do { + const uint8_t *s = src; + uint8_t *d = dst; + int width = w; + + do { + uint8x8_t d0 = vld1_u8(s); + if (w == 4) { + store_u8_4x1(d, d0); + } else { + vst1_u8(d, d0); + } + + s += 8; + d += 8; + width -= 8; + } while (width > 0); + src += src_stride; + dst += dst_stride; + } while (--h != 0); + } else { + const uint8x16x3_t permute_tbl = vld1q_u8_x3(dot_prod_permute_tbl); + // This shim of 1 << (ROUND0_BITS - 1) enables us to use a single rounding + // right shift by FILTER_BITS - instead of a first rounding right shift by + // ROUND0_BITS, followed by second rounding right shift by FILTER_BITS - + // ROUND0_BITS. + const int32x4_t horiz_const = vdupq_n_s32(1 << (ROUND0_BITS - 1)); + + if (w <= 4) { + do { + uint8x16_t s0, s1, s2, s3; + load_u8_16x4(src, src_stride, &s0, &s1, &s2, &s3); + + int16x4_t d0 = convolve12_4_x(s0, filter, permute_tbl, horiz_const); + int16x4_t d1 = convolve12_4_x(s1, filter, permute_tbl, horiz_const); + int16x4_t d2 = convolve12_4_x(s2, filter, permute_tbl, horiz_const); + int16x4_t d3 = convolve12_4_x(s3, filter, permute_tbl, horiz_const); + + uint8x8_t d01 = vqmovun_s16(vcombine_s16(d0, d1)); + uint8x8_t d23 = vqmovun_s16(vcombine_s16(d2, d3)); + + store_u8x4_strided_x2(dst + 0 * dst_stride, dst_stride, d01); + store_u8x4_strided_x2(dst + 2 * dst_stride, dst_stride, d23); + + dst += 4 * dst_stride; + src += 4 * src_stride; + h -= 4; + } while (h != 0); + } else { + do { + const uint8_t *s = src; + uint8_t *d = dst; + int width = w; + + do { + uint8x16_t s0[2], s1[2], s2[2], s3[2]; + load_u8_16x4(s, src_stride, &s0[0], &s1[0], &s2[0], &s3[0]); + load_u8_16x4(s + 4, src_stride, &s0[1], &s1[1], &s2[1], &s3[1]); + + uint8x8_t d0 = convolve12_8_x(s0, filter, permute_tbl, horiz_const); + uint8x8_t d1 = convolve12_8_x(s1, filter, permute_tbl, horiz_const); + uint8x8_t d2 = convolve12_8_x(s2, filter, permute_tbl, horiz_const); + uint8x8_t d3 = convolve12_8_x(s3, filter, permute_tbl, horiz_const); + + store_u8_8x4(d + 0 * dst_stride, dst_stride, d0, d1, d2, d3); + + s += 8; + d += 8; + width -= 8; + } while (width != 0); + src += 4 * src_stride; + dst += 4 * dst_stride; + h -= 4; + } while (h != 0); + } + } +} + +static INLINE int16x4_t convolve4_4_x(uint8x16_t samples, const int8x8_t filter, + const uint8x16_t permute_tbl, + const int32x4_t horiz_const) { + // Permute samples ready for dot product. + // { 0, 1, 2, 3, 1, 2, 3, 4, 2, 3, 4, 5, 3, 4, 5, 6 } + uint8x16_t permuted_samples = vqtbl1q_u8(samples, permute_tbl); + + // First 4 output values. + int32x4_t sum = vusdotq_lane_s32(horiz_const, permuted_samples, filter, 0); + + // Packing is performed by the caller. + return vmovn_s32(sum); +} + +static INLINE uint8x8_t convolve8_8_x(uint8x16_t samples, const int8x8_t filter, + const uint8x16x3_t permute_tbl, + const int32x4_t horiz_const) { + uint8x16_t permuted_samples[3]; + int32x4_t sum[2]; + + // Permute samples ready for dot product. + // { 0, 1, 2, 3, 1, 2, 3, 4, 2, 3, 4, 5, 3, 4, 5, 6 } + permuted_samples[0] = vqtbl1q_u8(samples, permute_tbl.val[0]); + // { 4, 5, 6, 7, 5, 6, 7, 8, 6, 7, 8, 9, 7, 8, 9, 10 } + permuted_samples[1] = vqtbl1q_u8(samples, permute_tbl.val[1]); + // { 8, 9, 10, 11, 9, 10, 11, 12, 10, 11, 12, 13, 11, 12, 13, 14 } + permuted_samples[2] = vqtbl1q_u8(samples, permute_tbl.val[2]); + + // First 4 output values. + sum[0] = vusdotq_lane_s32(horiz_const, permuted_samples[0], filter, 0); + sum[0] = vusdotq_lane_s32(sum[0], permuted_samples[1], filter, 1); + // Second 4 output values. + sum[1] = vusdotq_lane_s32(horiz_const, permuted_samples[1], filter, 0); + sum[1] = vusdotq_lane_s32(sum[1], permuted_samples[2], filter, 1); + + int16x8_t sum_s16 = vcombine_s16(vmovn_s32(sum[0]), vmovn_s32(sum[1])); + // We halved the convolution filter values so - 1 from the right shift. + return vqrshrun_n_s16(sum_s16, FILTER_BITS - 1); +} + +void av1_convolve_x_sr_neon_i8mm(const uint8_t *src, int src_stride, + uint8_t *dst, int dst_stride, int w, int h, + const InterpFilterParams *filter_params_x, + const int subpel_x_qn, + ConvolveParams *conv_params) { + if (w == 2 || h == 2) { + av1_convolve_x_sr_c(src, src_stride, dst, dst_stride, w, h, filter_params_x, + subpel_x_qn, conv_params); + return; + } + + const uint8_t horiz_offset = filter_params_x->taps / 2 - 1; + src -= horiz_offset; + + const int16_t *x_filter_ptr = av1_get_interp_filter_subpel_kernel( + filter_params_x, subpel_x_qn & SUBPEL_MASK); + + if (filter_params_x->taps > 8) { + convolve_x_sr_12tap_neon_i8mm(src, src_stride, dst, dst_stride, w, h, + x_filter_ptr); + return; + } + + // This shim of 1 << ((ROUND0_BITS - 1) - 1) enables us to use a single + // rounding right shift by FILTER_BITS - instead of a first rounding right + // shift by ROUND0_BITS, followed by second rounding right shift by + // FILTER_BITS - ROUND0_BITS. + // The outermost -1 is needed because we will halve the filter values. + const int32x4_t horiz_const = vdupq_n_s32(1 << ((ROUND0_BITS - 1) - 1)); + + if (w <= 4) { + const uint8x16_t permute_tbl = vld1q_u8(dot_prod_permute_tbl); + // 4-tap filters are used for blocks having width <= 4. + // Filter values are even, so halve to reduce intermediate precision reqs. + const int8x8_t x_filter = + vshrn_n_s16(vcombine_s16(vld1_s16(x_filter_ptr + 2), vdup_n_s16(0)), 1); + + src += 2; + + do { + uint8x16_t s0, s1, s2, s3; + load_u8_16x4(src, src_stride, &s0, &s1, &s2, &s3); + + int16x4_t d0 = convolve4_4_x(s0, x_filter, permute_tbl, horiz_const); + int16x4_t d1 = convolve4_4_x(s1, x_filter, permute_tbl, horiz_const); + int16x4_t d2 = convolve4_4_x(s2, x_filter, permute_tbl, horiz_const); + int16x4_t d3 = convolve4_4_x(s3, x_filter, permute_tbl, horiz_const); + + // We halved the convolution filter values so - 1 from the right shift. + uint8x8_t d01 = vqrshrun_n_s16(vcombine_s16(d0, d1), FILTER_BITS - 1); + uint8x8_t d23 = vqrshrun_n_s16(vcombine_s16(d2, d3), FILTER_BITS - 1); + + store_u8x4_strided_x2(dst + 0 * dst_stride, dst_stride, d01); + store_u8x4_strided_x2(dst + 2 * dst_stride, dst_stride, d23); + + src += 4 * src_stride; + dst += 4 * dst_stride; + h -= 4; + } while (h != 0); + + } else { + const uint8x16x3_t permute_tbl = vld1q_u8_x3(dot_prod_permute_tbl); + // Filter values are even, so halve to reduce intermediate precision reqs. + const int8x8_t x_filter = vshrn_n_s16(vld1q_s16(x_filter_ptr), 1); + + do { + const uint8_t *s = src; + uint8_t *d = dst; + int width = w; + + do { + uint8x16_t s0, s1, s2, s3; + load_u8_16x4(s, src_stride, &s0, &s1, &s2, &s3); + + uint8x8_t d0 = convolve8_8_x(s0, x_filter, permute_tbl, horiz_const); + uint8x8_t d1 = convolve8_8_x(s1, x_filter, permute_tbl, horiz_const); + uint8x8_t d2 = convolve8_8_x(s2, x_filter, permute_tbl, horiz_const); + uint8x8_t d3 = convolve8_8_x(s3, x_filter, permute_tbl, horiz_const); + + store_u8_8x4(d, dst_stride, d0, d1, d2, d3); + + s += 8; + d += 8; + width -= 8; + } while (width != 0); + src += 4 * src_stride; + dst += 4 * dst_stride; + h -= 4; + } while (h != 0); + } +} + +static INLINE int16x4_t convolve12_4_2d_h(uint8x16_t samples, + const int8x16_t filters, + const uint8x16x3_t permute_tbl, + int32x4_t horiz_const) { + uint8x16_t permuted_samples[3]; + int32x4_t sum; + + // Permute samples ready for dot product. + // { 0, 1, 2, 3, 1, 2, 3, 4, 2, 3, 4, 5, 3, 4, 5, 6 } + permuted_samples[0] = vqtbl1q_u8(samples, permute_tbl.val[0]); + // { 4, 5, 6, 7, 5, 6, 7, 8, 6, 7, 8, 9, 7, 8, 9, 10 } + permuted_samples[1] = vqtbl1q_u8(samples, permute_tbl.val[1]); + // { 8, 9, 10, 11, 9, 10, 11, 12, 10, 11, 12, 13, 11, 12, 13, 14 } + permuted_samples[2] = vqtbl1q_u8(samples, permute_tbl.val[2]); + + // First 4 output values. + sum = vusdotq_laneq_s32(horiz_const, permuted_samples[0], filters, 0); + sum = vusdotq_laneq_s32(sum, permuted_samples[1], filters, 1); + sum = vusdotq_laneq_s32(sum, permuted_samples[2], filters, 2); + + // Narrow and re-pack. + return vshrn_n_s32(sum, ROUND0_BITS); +} + +static INLINE int16x8_t convolve12_8_2d_h(uint8x16_t samples[2], + const int8x16_t filters, + const uint8x16x3_t permute_tbl, + const int32x4_t horiz_const) { + uint8x16_t permuted_samples[4]; + int32x4_t sum[2]; + + // Permute samples ready for dot product. + // { 0, 1, 2, 3, 1, 2, 3, 4, 2, 3, 4, 5, 3, 4, 5, 6 } + permuted_samples[0] = vqtbl1q_u8(samples[0], permute_tbl.val[0]); + // { 4, 5, 6, 7, 5, 6, 7, 8, 6, 7, 8, 9, 7, 8, 9, 10 } + permuted_samples[1] = vqtbl1q_u8(samples[0], permute_tbl.val[1]); + // { 8, 9, 10, 11, 9, 10, 11, 12, 10, 11, 12, 13, 11, 12, 13, 14 } + permuted_samples[2] = vqtbl1q_u8(samples[0], permute_tbl.val[2]); + // {12, 13, 14, 15, 13, 14, 15, 16, 14, 15, 16, 17, 15, 16, 17, 18 } + permuted_samples[3] = vqtbl1q_u8(samples[1], permute_tbl.val[2]); + + // First 4 output values. + sum[0] = vusdotq_laneq_s32(horiz_const, permuted_samples[0], filters, 0); + sum[0] = vusdotq_laneq_s32(sum[0], permuted_samples[1], filters, 1); + sum[0] = vusdotq_laneq_s32(sum[0], permuted_samples[2], filters, 2); + // Second 4 output values. + sum[1] = vusdotq_laneq_s32(horiz_const, permuted_samples[1], filters, 0); + sum[1] = vusdotq_laneq_s32(sum[1], permuted_samples[2], filters, 1); + sum[1] = vusdotq_laneq_s32(sum[1], permuted_samples[3], filters, 2); + + // Narrow and re-pack. + return vcombine_s16(vshrn_n_s32(sum[0], ROUND0_BITS), + vshrn_n_s32(sum[1], ROUND0_BITS)); +} + +static INLINE void convolve_2d_sr_horiz_12tap_neon_i8mm( + const uint8_t *src_ptr, int src_stride, int16_t *dst_ptr, + const int dst_stride, int w, int h, const int16x8_t x_filter_0_7, + const int16x4_t x_filter_8_11) { + const int bd = 8; + + // Special case the following no-op filter as 128 won't fit into the + // 8-bit signed dot-product instruction: + // { 0, 0, 0, 0, 0, 128, 0, 0, 0, 0, 0, 0 } + if (vgetq_lane_s16(x_filter_0_7, 5) == 128) { + const uint16x8_t horiz_const = vdupq_n_u16((1 << (bd - 1))); + // Undo the horizontal offset in the calling function. + src_ptr += 5; + + do { + const uint8_t *s = src_ptr; + int16_t *d = dst_ptr; + int width = w; + + do { + uint8x8_t s0 = vld1_u8(s); + uint16x8_t d0 = vaddw_u8(horiz_const, s0); + d0 = vshlq_n_u16(d0, FILTER_BITS - ROUND0_BITS); + // Store 8 elements to avoid additional branches. This is safe if the + // actual block width is < 8 because the intermediate buffer is large + // enough to accommodate 128x128 blocks. + vst1q_s16(d, vreinterpretq_s16_u16(d0)); + + d += 8; + s += 8; + width -= 8; + } while (width > 0); + src_ptr += src_stride; + dst_ptr += dst_stride; + } while (--h != 0); + + } else { + // Narrow filter values to 8-bit. + const int16x8x2_t x_filter_s16 = { + { x_filter_0_7, vcombine_s16(x_filter_8_11, vdup_n_s16(0)) } + }; + const int8x16_t x_filter = vcombine_s8(vmovn_s16(x_filter_s16.val[0]), + vmovn_s16(x_filter_s16.val[1])); + // This shim of 1 << (ROUND0_BITS - 1) enables us to use non-rounding shifts + // - which are generally faster than rounding shifts on modern CPUs. + const int32x4_t horiz_const = + vdupq_n_s32((1 << (bd + FILTER_BITS - 1)) + (1 << (ROUND0_BITS - 1))); + const uint8x16x3_t permute_tbl = vld1q_u8_x3(dot_prod_permute_tbl); + + if (w <= 4) { + do { + uint8x16_t s0, s1, s2, s3; + load_u8_16x4(src_ptr, src_stride, &s0, &s1, &s2, &s3); + + int16x4_t d0 = + convolve12_4_2d_h(s0, x_filter, permute_tbl, horiz_const); + int16x4_t d1 = + convolve12_4_2d_h(s1, x_filter, permute_tbl, horiz_const); + int16x4_t d2 = + convolve12_4_2d_h(s2, x_filter, permute_tbl, horiz_const); + int16x4_t d3 = + convolve12_4_2d_h(s3, x_filter, permute_tbl, horiz_const); + + store_s16_4x4(dst_ptr, dst_stride, d0, d1, d2, d3); + + src_ptr += 4 * src_stride; + dst_ptr += 4 * dst_stride; + h -= 4; + } while (h > 4); + + do { + uint8x16_t s0 = vld1q_u8(src_ptr); + int16x4_t d0 = + convolve12_4_2d_h(s0, x_filter, permute_tbl, horiz_const); + vst1_s16(dst_ptr, d0); + + src_ptr += src_stride; + dst_ptr += dst_stride; + } while (--h != 0); + + } else { + do { + const uint8_t *s = src_ptr; + int16_t *d = dst_ptr; + int width = w; + + do { + uint8x16_t s0[2], s1[2], s2[2], s3[2]; + load_u8_16x4(s, src_stride, &s0[0], &s1[0], &s2[0], &s3[0]); + load_u8_16x4(s + 4, src_stride, &s0[1], &s1[1], &s2[1], &s3[1]); + + int16x8_t d0 = + convolve12_8_2d_h(s0, x_filter, permute_tbl, horiz_const); + int16x8_t d1 = + convolve12_8_2d_h(s1, x_filter, permute_tbl, horiz_const); + int16x8_t d2 = + convolve12_8_2d_h(s2, x_filter, permute_tbl, horiz_const); + int16x8_t d3 = + convolve12_8_2d_h(s3, x_filter, permute_tbl, horiz_const); + + store_s16_8x4(d, dst_stride, d0, d1, d2, d3); + + s += 8; + d += 8; + width -= 8; + } while (width != 0); + + src_ptr += 4 * src_stride; + dst_ptr += 4 * dst_stride; + h -= 4; + } while (h > 4); + + do { + const uint8_t *s = src_ptr; + int16_t *d = dst_ptr; + int width = w; + + do { + uint8x16_t s0[2]; + s0[0] = vld1q_u8(s); + s0[1] = vld1q_u8(s + 4); + int16x8_t d0 = + convolve12_8_2d_h(s0, x_filter, permute_tbl, horiz_const); + vst1q_s16(d, d0); + + s += 8; + d += 8; + width -= 8; + } while (width != 0); + src_ptr += src_stride; + dst_ptr += dst_stride; + } while (--h != 0); + } + } +} + +static INLINE int16x4_t convolve4_4_2d_h(uint8x16_t samples, + const int8x8_t filters, + const uint8x16_t permute_tbl, + const int32x4_t horiz_const) { + // Permute samples ready for dot product. + // { 0, 1, 2, 3, 1, 2, 3, 4, 2, 3, 4, 5, 3, 4, 5, 6 } + uint8x16_t permuted_samples = vqtbl1q_u8(samples, permute_tbl); + + // First 4 output values. + int32x4_t sum = vusdotq_lane_s32(horiz_const, permuted_samples, filters, 0); + + // We halved the convolution filter values so -1 from the right shift. + return vshrn_n_s32(sum, ROUND0_BITS - 1); +} + +static INLINE int16x8_t convolve8_8_2d_h(uint8x16_t samples, + const int8x8_t filters, + const uint8x16x3_t permute_tbl, + const int32x4_t horiz_const) { + uint8x16_t permuted_samples[3]; + int32x4_t sum[2]; + + // Permute samples ready for dot product. + // { 0, 1, 2, 3, 1, 2, 3, 4, 2, 3, 4, 5, 3, 4, 5, 6 } + permuted_samples[0] = vqtbl1q_u8(samples, permute_tbl.val[0]); + // { 4, 5, 6, 7, 5, 6, 7, 8, 6, 7, 8, 9, 7, 8, 9, 10 } + permuted_samples[1] = vqtbl1q_u8(samples, permute_tbl.val[1]); + // { 8, 9, 10, 11, 9, 10, 11, 12, 10, 11, 12, 13, 11, 12, 13, 14 } + permuted_samples[2] = vqtbl1q_u8(samples, permute_tbl.val[2]); + + // First 4 output values. + sum[0] = vusdotq_lane_s32(horiz_const, permuted_samples[0], filters, 0); + sum[0] = vusdotq_lane_s32(sum[0], permuted_samples[1], filters, 1); + // Second 4 output values. + sum[1] = vusdotq_lane_s32(horiz_const, permuted_samples[1], filters, 0); + sum[1] = vusdotq_lane_s32(sum[1], permuted_samples[2], filters, 1); + + // Narrow and re-pack. + // We halved the convolution filter values so -1 from the right shift. + return vcombine_s16(vshrn_n_s32(sum[0], ROUND0_BITS - 1), + vshrn_n_s32(sum[1], ROUND0_BITS - 1)); +} + +static INLINE void convolve_2d_sr_horiz_neon_i8mm( + const uint8_t *src, int src_stride, int16_t *im_block, int im_stride, int w, + int im_h, const int16_t *x_filter_ptr) { + const int bd = 8; + // This shim of 1 << ((ROUND0_BITS - 1) - 1) enables us to use non-rounding + // shifts - which are generally faster than rounding shifts on modern CPUs. + // The outermost -1 is needed because we halved the filter values. + const int32x4_t horiz_const = vdupq_n_s32((1 << (bd + FILTER_BITS - 2)) + + (1 << ((ROUND0_BITS - 1) - 1))); + + const uint8_t *src_ptr = src; + int16_t *dst_ptr = im_block; + int dst_stride = im_stride; + int height = im_h; + + if (w <= 4) { + const uint8x16_t permute_tbl = vld1q_u8(dot_prod_permute_tbl); + // 4-tap filters are used for blocks having width <= 4. + // Filter values are even, so halve to reduce intermediate precision reqs. + const int8x8_t x_filter = + vshrn_n_s16(vcombine_s16(vld1_s16(x_filter_ptr + 2), vdup_n_s16(0)), 1); + + src_ptr += 2; + + do { + uint8x16_t s0, s1, s2, s3; + load_u8_16x4(src_ptr, src_stride, &s0, &s1, &s2, &s3); + + int16x4_t d0 = convolve4_4_2d_h(s0, x_filter, permute_tbl, horiz_const); + int16x4_t d1 = convolve4_4_2d_h(s1, x_filter, permute_tbl, horiz_const); + int16x4_t d2 = convolve4_4_2d_h(s2, x_filter, permute_tbl, horiz_const); + int16x4_t d3 = convolve4_4_2d_h(s3, x_filter, permute_tbl, horiz_const); + + store_s16_4x4(dst_ptr, dst_stride, d0, d1, d2, d3); + + src_ptr += 4 * src_stride; + dst_ptr += 4 * dst_stride; + height -= 4; + } while (height > 4); + + do { + uint8x16_t s0 = vld1q_u8(src_ptr); + int16x4_t d0 = convolve4_4_2d_h(s0, x_filter, permute_tbl, horiz_const); + vst1_s16(dst_ptr, d0); + + src_ptr += src_stride; + dst_ptr += dst_stride; + } while (--height != 0); + } else { + const uint8x16x3_t permute_tbl = vld1q_u8_x3(dot_prod_permute_tbl); + // Filter values are even, so halve to reduce intermediate precision reqs. + const int8x8_t x_filter = vshrn_n_s16(vld1q_s16(x_filter_ptr), 1); + + do { + const uint8_t *s = src_ptr; + int16_t *d = dst_ptr; + int width = w; + + do { + uint8x16_t s0, s1, s2, s3; + load_u8_16x4(s, src_stride, &s0, &s1, &s2, &s3); + + int16x8_t d0 = convolve8_8_2d_h(s0, x_filter, permute_tbl, horiz_const); + int16x8_t d1 = convolve8_8_2d_h(s1, x_filter, permute_tbl, horiz_const); + int16x8_t d2 = convolve8_8_2d_h(s2, x_filter, permute_tbl, horiz_const); + int16x8_t d3 = convolve8_8_2d_h(s3, x_filter, permute_tbl, horiz_const); + + store_s16_8x4(d, dst_stride, d0, d1, d2, d3); + + s += 8; + d += 8; + width -= 8; + } while (width != 0); + src_ptr += 4 * src_stride; + dst_ptr += 4 * dst_stride; + height -= 4; + } while (height > 4); + + do { + const uint8_t *s = src_ptr; + int16_t *d = dst_ptr; + int width = w; + + do { + uint8x16_t s0 = vld1q_u8(s); + int16x8_t d0 = convolve8_8_2d_h(s0, x_filter, permute_tbl, horiz_const); + vst1q_s16(d, d0); + + s += 8; + d += 8; + width -= 8; + } while (width != 0); + src_ptr += src_stride; + dst_ptr += dst_stride; + } while (--height != 0); + } +} + +void av1_convolve_2d_sr_neon_i8mm(const uint8_t *src, int src_stride, + uint8_t *dst, int dst_stride, int w, int h, + const InterpFilterParams *filter_params_x, + const InterpFilterParams *filter_params_y, + const int subpel_x_qn, const int subpel_y_qn, + ConvolveParams *conv_params) { + if (w == 2 || h == 2) { + av1_convolve_2d_sr_c(src, src_stride, dst, dst_stride, w, h, + filter_params_x, filter_params_y, subpel_x_qn, + subpel_y_qn, conv_params); + return; + } + + const int y_filter_taps = get_filter_tap(filter_params_y, subpel_y_qn); + const int clamped_y_taps = y_filter_taps < 6 ? 6 : y_filter_taps; + const int im_h = h + clamped_y_taps - 1; + const int im_stride = MAX_SB_SIZE; + const int vert_offset = clamped_y_taps / 2 - 1; + const int horiz_offset = filter_params_x->taps / 2 - 1; + const uint8_t *src_ptr = src - vert_offset * src_stride - horiz_offset; + + const int16_t *x_filter_ptr = av1_get_interp_filter_subpel_kernel( + filter_params_x, subpel_x_qn & SUBPEL_MASK); + const int16_t *y_filter_ptr = av1_get_interp_filter_subpel_kernel( + filter_params_y, subpel_y_qn & SUBPEL_MASK); + + if (filter_params_x->taps > 8) { + DECLARE_ALIGNED(16, int16_t, + im_block[(MAX_SB_SIZE + MAX_FILTER_TAP - 1) * MAX_SB_SIZE]); + + const int16x8_t x_filter_0_7 = vld1q_s16(x_filter_ptr); + const int16x4_t x_filter_8_11 = vld1_s16(x_filter_ptr + 8); + const int16x8_t y_filter_0_7 = vld1q_s16(y_filter_ptr); + const int16x4_t y_filter_8_11 = vld1_s16(y_filter_ptr + 8); + + convolve_2d_sr_horiz_12tap_neon_i8mm(src_ptr, src_stride, im_block, + im_stride, w, im_h, x_filter_0_7, + x_filter_8_11); + + convolve_2d_sr_vert_12tap_neon(im_block, im_stride, dst, dst_stride, w, h, + y_filter_0_7, y_filter_8_11); + } else { + DECLARE_ALIGNED(16, int16_t, + im_block[(MAX_SB_SIZE + SUBPEL_TAPS - 1) * MAX_SB_SIZE]); + + convolve_2d_sr_horiz_neon_i8mm(src_ptr, src_stride, im_block, im_stride, w, + im_h, x_filter_ptr); + + const int16x8_t y_filter = vld1q_s16(y_filter_ptr); + + if (clamped_y_taps <= 6) { + convolve_2d_sr_vert_6tap_neon(im_block, im_stride, dst, dst_stride, w, h, + y_filter); + } else { + convolve_2d_sr_vert_8tap_neon(im_block, im_stride, dst, dst_stride, w, h, + y_filter); + } + } +} |