| /* | 
 |  * Copyright (c) 2024, 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. | 
 |  */ | 
 |  | 
 | #ifndef AOM_AV1_COMMON_ARM_CONVOLVE_SCALE_NEON_H_ | 
 | #define AOM_AV1_COMMON_ARM_CONVOLVE_SCALE_NEON_H_ | 
 |  | 
 | #include <assert.h> | 
 | #include <arm_neon.h> | 
 |  | 
 | #include "config/aom_config.h" | 
 | #include "config/av1_rtcd.h" | 
 |  | 
 | #include "aom_dsp/arm/mem_neon.h" | 
 | #include "aom_dsp/arm/transpose_neon.h" | 
 |  | 
 | static inline int16x4_t compound_convolve8_4_v( | 
 |     const int16x4_t s0, const int16x4_t s1, const int16x4_t s2, | 
 |     const int16x4_t s3, const int16x4_t s4, const int16x4_t s5, | 
 |     const int16x4_t s6, const int16x4_t s7, const int16x8_t filter, | 
 |     const int32x4_t offset_const) { | 
 |   const int16x4_t filter_0_3 = vget_low_s16(filter); | 
 |   const int16x4_t filter_4_7 = vget_high_s16(filter); | 
 |  | 
 |   int32x4_t sum = offset_const; | 
 |   sum = vmlal_lane_s16(sum, s0, filter_0_3, 0); | 
 |   sum = vmlal_lane_s16(sum, s1, filter_0_3, 1); | 
 |   sum = vmlal_lane_s16(sum, s2, filter_0_3, 2); | 
 |   sum = vmlal_lane_s16(sum, s3, filter_0_3, 3); | 
 |   sum = vmlal_lane_s16(sum, s4, filter_4_7, 0); | 
 |   sum = vmlal_lane_s16(sum, s5, filter_4_7, 1); | 
 |   sum = vmlal_lane_s16(sum, s6, filter_4_7, 2); | 
 |   sum = vmlal_lane_s16(sum, s7, filter_4_7, 3); | 
 |  | 
 |   return vshrn_n_s32(sum, COMPOUND_ROUND1_BITS); | 
 | } | 
 |  | 
 | static inline int16x8_t compound_convolve8_8_v( | 
 |     const int16x8_t s0, const int16x8_t s1, const int16x8_t s2, | 
 |     const int16x8_t s3, const int16x8_t s4, const int16x8_t s5, | 
 |     const int16x8_t s6, const int16x8_t s7, const int16x8_t filter, | 
 |     const int32x4_t offset_const) { | 
 |   const int16x4_t filter_0_3 = vget_low_s16(filter); | 
 |   const int16x4_t filter_4_7 = vget_high_s16(filter); | 
 |  | 
 |   int32x4_t sum0 = offset_const; | 
 |   sum0 = vmlal_lane_s16(sum0, vget_low_s16(s0), filter_0_3, 0); | 
 |   sum0 = vmlal_lane_s16(sum0, vget_low_s16(s1), filter_0_3, 1); | 
 |   sum0 = vmlal_lane_s16(sum0, vget_low_s16(s2), filter_0_3, 2); | 
 |   sum0 = vmlal_lane_s16(sum0, vget_low_s16(s3), filter_0_3, 3); | 
 |   sum0 = vmlal_lane_s16(sum0, vget_low_s16(s4), filter_4_7, 0); | 
 |   sum0 = vmlal_lane_s16(sum0, vget_low_s16(s5), filter_4_7, 1); | 
 |   sum0 = vmlal_lane_s16(sum0, vget_low_s16(s6), filter_4_7, 2); | 
 |   sum0 = vmlal_lane_s16(sum0, vget_low_s16(s7), filter_4_7, 3); | 
 |  | 
 |   int32x4_t sum1 = offset_const; | 
 |   sum1 = vmlal_lane_s16(sum1, vget_high_s16(s0), filter_0_3, 0); | 
 |   sum1 = vmlal_lane_s16(sum1, vget_high_s16(s1), filter_0_3, 1); | 
 |   sum1 = vmlal_lane_s16(sum1, vget_high_s16(s2), filter_0_3, 2); | 
 |   sum1 = vmlal_lane_s16(sum1, vget_high_s16(s3), filter_0_3, 3); | 
 |   sum1 = vmlal_lane_s16(sum1, vget_high_s16(s4), filter_4_7, 0); | 
 |   sum1 = vmlal_lane_s16(sum1, vget_high_s16(s5), filter_4_7, 1); | 
 |   sum1 = vmlal_lane_s16(sum1, vget_high_s16(s6), filter_4_7, 2); | 
 |   sum1 = vmlal_lane_s16(sum1, vget_high_s16(s7), filter_4_7, 3); | 
 |  | 
 |   int16x4_t res0 = vshrn_n_s32(sum0, COMPOUND_ROUND1_BITS); | 
 |   int16x4_t res1 = vshrn_n_s32(sum1, COMPOUND_ROUND1_BITS); | 
 |  | 
 |   return vcombine_s16(res0, res1); | 
 | } | 
 |  | 
 | static inline void compound_convolve_vert_scale_8tap_neon( | 
 |     const int16_t *src, int src_stride, uint16_t *dst, int dst_stride, int w, | 
 |     int h, const int16_t *y_filter, int subpel_y_qn, int y_step_qn) { | 
 |   const int bd = 8; | 
 |   const int offset_bits = bd + 2 * FILTER_BITS - ROUND0_BITS; | 
 |   // A shim of 1 << (COMPOUND_ROUND1_BITS - 1) enables us to use | 
 |   // non-rounding shifts - which are generally faster than rounding shifts on | 
 |   // modern CPUs. | 
 |   const int32x4_t vert_offset = | 
 |       vdupq_n_s32((1 << offset_bits) + (1 << (COMPOUND_ROUND1_BITS - 1))); | 
 |  | 
 |   int y_qn = subpel_y_qn; | 
 |  | 
 |   if (w == 4) { | 
 |     do { | 
 |       const int16_t *s = &src[(y_qn >> SCALE_SUBPEL_BITS) * src_stride]; | 
 |  | 
 |       const ptrdiff_t filter_offset = | 
 |           SUBPEL_TAPS * ((y_qn & SCALE_SUBPEL_MASK) >> SCALE_EXTRA_BITS); | 
 |       const int16x8_t filter = vld1q_s16(y_filter + filter_offset); | 
 |  | 
 |       int16x4_t s0, s1, s2, s3, s4, s5, s6, s7; | 
 |       load_s16_4x8(s, src_stride, &s0, &s1, &s2, &s3, &s4, &s5, &s6, &s7); | 
 |  | 
 |       int16x4_t d0 = compound_convolve8_4_v(s0, s1, s2, s3, s4, s5, s6, s7, | 
 |                                             filter, vert_offset); | 
 |  | 
 |       vst1_u16(dst, vreinterpret_u16_s16(d0)); | 
 |  | 
 |       dst += dst_stride; | 
 |       y_qn += y_step_qn; | 
 |     } while (--h != 0); | 
 |   } else { | 
 |     do { | 
 |       const int16_t *s = &src[(y_qn >> SCALE_SUBPEL_BITS) * src_stride]; | 
 |  | 
 |       const ptrdiff_t filter_offset = | 
 |           SUBPEL_TAPS * ((y_qn & SCALE_SUBPEL_MASK) >> SCALE_EXTRA_BITS); | 
 |       const int16x8_t filter = vld1q_s16(y_filter + filter_offset); | 
 |  | 
 |       int width = w; | 
 |       uint16_t *d = dst; | 
 |  | 
 |       do { | 
 |         int16x8_t s0, s1, s2, s3, s4, s5, s6, s7; | 
 |         load_s16_8x8(s, src_stride, &s0, &s1, &s2, &s3, &s4, &s5, &s6, &s7); | 
 |  | 
 |         int16x8_t d0 = compound_convolve8_8_v(s0, s1, s2, s3, s4, s5, s6, s7, | 
 |                                               filter, vert_offset); | 
 |  | 
 |         vst1q_u16(d, vreinterpretq_u16_s16(d0)); | 
 |  | 
 |         s += 8; | 
 |         d += 8; | 
 |         width -= 8; | 
 |       } while (width != 0); | 
 |  | 
 |       dst += dst_stride; | 
 |       y_qn += y_step_qn; | 
 |     } while (--h != 0); | 
 |   } | 
 | } | 
 |  | 
 | static inline void compound_avg_convolve_vert_scale_8tap_neon( | 
 |     const int16_t *src, int src_stride, uint8_t *dst8, int dst8_stride, | 
 |     uint16_t *dst16, int dst16_stride, int w, int h, const int16_t *y_filter, | 
 |     int subpel_y_qn, int y_step_qn) { | 
 |   const int bd = 8; | 
 |   const int offset_bits = bd + 2 * FILTER_BITS - ROUND0_BITS; | 
 |   // A shim of 1 << (COMPOUND_ROUND1_BITS - 1) enables us to use | 
 |   // non-rounding shifts - which are generally faster than rounding shifts | 
 |   // on modern CPUs. | 
 |   const int32_t vert_offset_bits = | 
 |       (1 << offset_bits) + (1 << (COMPOUND_ROUND1_BITS - 1)); | 
 |   // For the averaging code path substract round offset and convolve round. | 
 |   const int32_t avg_offset_bits = (1 << (offset_bits + 1)) + (1 << offset_bits); | 
 |   const int32x4_t vert_offset = vdupq_n_s32(vert_offset_bits - avg_offset_bits); | 
 |  | 
 |   int y_qn = subpel_y_qn; | 
 |  | 
 |   if (w == 4) { | 
 |     do { | 
 |       const int16_t *s = &src[(y_qn >> SCALE_SUBPEL_BITS) * src_stride]; | 
 |  | 
 |       const ptrdiff_t filter_offset = | 
 |           SUBPEL_TAPS * ((y_qn & SCALE_SUBPEL_MASK) >> SCALE_EXTRA_BITS); | 
 |       const int16x8_t filter = vld1q_s16(y_filter + filter_offset); | 
 |  | 
 |       int16x4_t s0, s1, s2, s3, s4, s5, s6, s7; | 
 |       load_s16_4x8(s, src_stride, &s0, &s1, &s2, &s3, &s4, &s5, &s6, &s7); | 
 |  | 
 |       int16x4_t d0 = compound_convolve8_4_v(s0, s1, s2, s3, s4, s5, s6, s7, | 
 |                                             filter, vert_offset); | 
 |  | 
 |       int16x4_t dd0 = vreinterpret_s16_u16(vld1_u16(dst16)); | 
 |  | 
 |       int16x4_t avg = vhadd_s16(dd0, d0); | 
 |       int16x8_t d0_s16 = vcombine_s16(avg, vdup_n_s16(0)); | 
 |  | 
 |       uint8x8_t d0_u8 = vqrshrun_n_s16( | 
 |           d0_s16, 2 * FILTER_BITS - ROUND0_BITS - COMPOUND_ROUND1_BITS); | 
 |  | 
 |       store_u8_4x1(dst8, d0_u8); | 
 |  | 
 |       dst16 += dst16_stride; | 
 |       dst8 += dst8_stride; | 
 |       y_qn += y_step_qn; | 
 |     } while (--h != 0); | 
 |   } else { | 
 |     do { | 
 |       const int16_t *s = &src[(y_qn >> SCALE_SUBPEL_BITS) * src_stride]; | 
 |  | 
 |       const ptrdiff_t filter_offset = | 
 |           SUBPEL_TAPS * ((y_qn & SCALE_SUBPEL_MASK) >> SCALE_EXTRA_BITS); | 
 |       const int16x8_t filter = vld1q_s16(y_filter + filter_offset); | 
 |  | 
 |       int width = w; | 
 |       uint8_t *dst8_ptr = dst8; | 
 |       uint16_t *dst16_ptr = dst16; | 
 |  | 
 |       do { | 
 |         int16x8_t s0, s1, s2, s3, s4, s5, s6, s7; | 
 |         load_s16_8x8(s, src_stride, &s0, &s1, &s2, &s3, &s4, &s5, &s6, &s7); | 
 |  | 
 |         int16x8_t d0 = compound_convolve8_8_v(s0, s1, s2, s3, s4, s5, s6, s7, | 
 |                                               filter, vert_offset); | 
 |  | 
 |         int16x8_t dd0 = vreinterpretq_s16_u16(vld1q_u16(dst16_ptr)); | 
 |  | 
 |         int16x8_t avg = vhaddq_s16(dd0, d0); | 
 |  | 
 |         uint8x8_t d0_u8 = vqrshrun_n_s16( | 
 |             avg, 2 * FILTER_BITS - ROUND0_BITS - COMPOUND_ROUND1_BITS); | 
 |  | 
 |         vst1_u8(dst8_ptr, d0_u8); | 
 |  | 
 |         s += 8; | 
 |         dst8_ptr += 8; | 
 |         dst16_ptr += 8; | 
 |         width -= 8; | 
 |       } while (width != 0); | 
 |  | 
 |       dst16 += dst16_stride; | 
 |       dst8 += dst8_stride; | 
 |       y_qn += y_step_qn; | 
 |     } while (--h != 0); | 
 |   } | 
 | } | 
 |  | 
 | static inline void compound_dist_wtd_convolve_vert_scale_8tap_neon( | 
 |     const int16_t *src, int src_stride, uint8_t *dst8, int dst8_stride, | 
 |     uint16_t *dst16, int dst16_stride, int w, int h, const int16_t *y_filter, | 
 |     ConvolveParams *conv_params, int subpel_y_qn, int y_step_qn) { | 
 |   const int bd = 8; | 
 |   const int offset_bits = bd + 2 * FILTER_BITS - ROUND0_BITS; | 
 |   int y_qn = subpel_y_qn; | 
 |   // A shim of 1 << (COMPOUND_ROUND1_BITS - 1) enables us to use | 
 |   // non-rounding shifts - which are generally faster than rounding shifts on | 
 |   // modern CPUs. | 
 |   const int32x4_t vert_offset = | 
 |       vdupq_n_s32((1 << offset_bits) + (1 << (COMPOUND_ROUND1_BITS - 1))); | 
 |   // For the weighted averaging code path we have to substract round offset and | 
 |   // convolve round. The shim of 1 << (2 * FILTER_BITS - ROUND0_BITS - | 
 |   // COMPOUND_ROUND1_BITS - 1) enables us to use non-rounding shifts. The | 
 |   // additional shift by DIST_PRECISION_BITS is needed in order to merge two | 
 |   // shift calculations into one. | 
 |   const int32x4_t dist_wtd_offset = vdupq_n_s32( | 
 |       (1 << (2 * FILTER_BITS - ROUND0_BITS - COMPOUND_ROUND1_BITS - 1 + | 
 |              DIST_PRECISION_BITS)) - | 
 |       (1 << (offset_bits - COMPOUND_ROUND1_BITS + DIST_PRECISION_BITS)) - | 
 |       (1 << (offset_bits - COMPOUND_ROUND1_BITS - 1 + DIST_PRECISION_BITS))); | 
 |   const int16x4_t bck_offset = vdup_n_s16(conv_params->bck_offset); | 
 |   const int16x4_t fwd_offset = vdup_n_s16(conv_params->fwd_offset); | 
 |  | 
 |   if (w == 4) { | 
 |     do { | 
 |       const int16_t *s = &src[(y_qn >> SCALE_SUBPEL_BITS) * src_stride]; | 
 |  | 
 |       const ptrdiff_t filter_offset = | 
 |           SUBPEL_TAPS * ((y_qn & SCALE_SUBPEL_MASK) >> SCALE_EXTRA_BITS); | 
 |       const int16x8_t filter = vld1q_s16(y_filter + filter_offset); | 
 |  | 
 |       int16x4_t s0, s1, s2, s3, s4, s5, s6, s7; | 
 |       load_s16_4x8(s, src_stride, &s0, &s1, &s2, &s3, &s4, &s5, &s6, &s7); | 
 |  | 
 |       int16x4_t d0 = compound_convolve8_4_v(s0, s1, s2, s3, s4, s5, s6, s7, | 
 |                                             filter, vert_offset); | 
 |  | 
 |       int16x4_t dd0 = vreinterpret_s16_u16(vld1_u16(dst16)); | 
 |  | 
 |       int32x4_t dst_wtd_avg = vmlal_s16(dist_wtd_offset, bck_offset, d0); | 
 |       dst_wtd_avg = vmlal_s16(dst_wtd_avg, fwd_offset, dd0); | 
 |  | 
 |       int16x4_t d0_s16 = vshrn_n_s32( | 
 |           dst_wtd_avg, 2 * FILTER_BITS - ROUND0_BITS - COMPOUND_ROUND1_BITS + | 
 |                            DIST_PRECISION_BITS); | 
 |  | 
 |       uint8x8_t d0_u8 = vqmovun_s16(vcombine_s16(d0_s16, vdup_n_s16(0))); | 
 |  | 
 |       store_u8_4x1(dst8, d0_u8); | 
 |  | 
 |       dst16 += dst16_stride; | 
 |       dst8 += dst8_stride; | 
 |       y_qn += y_step_qn; | 
 |     } while (--h != 0); | 
 |   } else { | 
 |     do { | 
 |       const int16_t *s = &src[(y_qn >> SCALE_SUBPEL_BITS) * src_stride]; | 
 |  | 
 |       const ptrdiff_t filter_offset = | 
 |           SUBPEL_TAPS * ((y_qn & SCALE_SUBPEL_MASK) >> SCALE_EXTRA_BITS); | 
 |       const int16x8_t filter = vld1q_s16(y_filter + filter_offset); | 
 |  | 
 |       int width = w; | 
 |       uint8_t *dst8_ptr = dst8; | 
 |       uint16_t *dst16_ptr = dst16; | 
 |  | 
 |       do { | 
 |         int16x8_t s0, s1, s2, s3, s4, s5, s6, s7; | 
 |         load_s16_8x8(s, src_stride, &s0, &s1, &s2, &s3, &s4, &s5, &s6, &s7); | 
 |  | 
 |         int16x8_t d0 = compound_convolve8_8_v(s0, s1, s2, s3, s4, s5, s6, s7, | 
 |                                               filter, vert_offset); | 
 |  | 
 |         int16x8_t dd0 = vreinterpretq_s16_u16(vld1q_u16(dst16_ptr)); | 
 |  | 
 |         int32x4_t dst_wtd_avg0 = | 
 |             vmlal_s16(dist_wtd_offset, bck_offset, vget_low_s16(d0)); | 
 |         int32x4_t dst_wtd_avg1 = | 
 |             vmlal_s16(dist_wtd_offset, bck_offset, vget_high_s16(d0)); | 
 |  | 
 |         dst_wtd_avg0 = vmlal_s16(dst_wtd_avg0, fwd_offset, vget_low_s16(dd0)); | 
 |         dst_wtd_avg1 = vmlal_s16(dst_wtd_avg1, fwd_offset, vget_high_s16(dd0)); | 
 |  | 
 |         int16x4_t d0_s16_0 = vshrn_n_s32( | 
 |             dst_wtd_avg0, 2 * FILTER_BITS - ROUND0_BITS - COMPOUND_ROUND1_BITS + | 
 |                               DIST_PRECISION_BITS); | 
 |         int16x4_t d0_s16_1 = vshrn_n_s32( | 
 |             dst_wtd_avg1, 2 * FILTER_BITS - ROUND0_BITS - COMPOUND_ROUND1_BITS + | 
 |                               DIST_PRECISION_BITS); | 
 |  | 
 |         uint8x8_t d0_u8 = vqmovun_s16(vcombine_s16(d0_s16_0, d0_s16_1)); | 
 |  | 
 |         vst1_u8(dst8_ptr, d0_u8); | 
 |  | 
 |         s += 8; | 
 |         dst8_ptr += 8; | 
 |         dst16_ptr += 8; | 
 |         width -= 8; | 
 |       } while (width != 0); | 
 |  | 
 |       dst16 += dst16_stride; | 
 |       dst8 += dst8_stride; | 
 |       y_qn += y_step_qn; | 
 |     } while (--h != 0); | 
 |   } | 
 | } | 
 |  | 
 | static inline uint8x8_t convolve8_4_v(const int16x4_t s0, const int16x4_t s1, | 
 |                                       const int16x4_t s2, const int16x4_t s3, | 
 |                                       const int16x4_t s4, const int16x4_t s5, | 
 |                                       const int16x4_t s6, const int16x4_t s7, | 
 |                                       const int16x8_t filter, | 
 |                                       const int32x4_t offset_const) { | 
 |   const int16x4_t filter_0_3 = vget_low_s16(filter); | 
 |   const int16x4_t filter_4_7 = vget_high_s16(filter); | 
 |  | 
 |   int32x4_t sum = offset_const; | 
 |   sum = vmlal_lane_s16(sum, s0, filter_0_3, 0); | 
 |   sum = vmlal_lane_s16(sum, s1, filter_0_3, 1); | 
 |   sum = vmlal_lane_s16(sum, s2, filter_0_3, 2); | 
 |   sum = vmlal_lane_s16(sum, s3, filter_0_3, 3); | 
 |   sum = vmlal_lane_s16(sum, s4, filter_4_7, 0); | 
 |   sum = vmlal_lane_s16(sum, s5, filter_4_7, 1); | 
 |   sum = vmlal_lane_s16(sum, s6, filter_4_7, 2); | 
 |   sum = vmlal_lane_s16(sum, s7, filter_4_7, 3); | 
 |  | 
 |   int16x4_t res = vshrn_n_s32(sum, 2 * FILTER_BITS - ROUND0_BITS); | 
 |  | 
 |   return vqmovun_s16(vcombine_s16(res, vdup_n_s16(0))); | 
 | } | 
 |  | 
 | static inline uint8x8_t convolve8_8_v(const int16x8_t s0, const int16x8_t s1, | 
 |                                       const int16x8_t s2, const int16x8_t s3, | 
 |                                       const int16x8_t s4, const int16x8_t s5, | 
 |                                       const int16x8_t s6, const int16x8_t s7, | 
 |                                       const int16x8_t filter, | 
 |                                       const int32x4_t offset_const) { | 
 |   const int16x4_t filter_0_3 = vget_low_s16(filter); | 
 |   const int16x4_t filter_4_7 = vget_high_s16(filter); | 
 |  | 
 |   int32x4_t sum0 = offset_const; | 
 |   sum0 = vmlal_lane_s16(sum0, vget_low_s16(s0), filter_0_3, 0); | 
 |   sum0 = vmlal_lane_s16(sum0, vget_low_s16(s1), filter_0_3, 1); | 
 |   sum0 = vmlal_lane_s16(sum0, vget_low_s16(s2), filter_0_3, 2); | 
 |   sum0 = vmlal_lane_s16(sum0, vget_low_s16(s3), filter_0_3, 3); | 
 |   sum0 = vmlal_lane_s16(sum0, vget_low_s16(s4), filter_4_7, 0); | 
 |   sum0 = vmlal_lane_s16(sum0, vget_low_s16(s5), filter_4_7, 1); | 
 |   sum0 = vmlal_lane_s16(sum0, vget_low_s16(s6), filter_4_7, 2); | 
 |   sum0 = vmlal_lane_s16(sum0, vget_low_s16(s7), filter_4_7, 3); | 
 |  | 
 |   int32x4_t sum1 = offset_const; | 
 |   sum1 = vmlal_lane_s16(sum1, vget_high_s16(s0), filter_0_3, 0); | 
 |   sum1 = vmlal_lane_s16(sum1, vget_high_s16(s1), filter_0_3, 1); | 
 |   sum1 = vmlal_lane_s16(sum1, vget_high_s16(s2), filter_0_3, 2); | 
 |   sum1 = vmlal_lane_s16(sum1, vget_high_s16(s3), filter_0_3, 3); | 
 |   sum1 = vmlal_lane_s16(sum1, vget_high_s16(s4), filter_4_7, 0); | 
 |   sum1 = vmlal_lane_s16(sum1, vget_high_s16(s5), filter_4_7, 1); | 
 |   sum1 = vmlal_lane_s16(sum1, vget_high_s16(s6), filter_4_7, 2); | 
 |   sum1 = vmlal_lane_s16(sum1, vget_high_s16(s7), filter_4_7, 3); | 
 |  | 
 |   int16x4_t res0 = vshrn_n_s32(sum0, 2 * FILTER_BITS - ROUND0_BITS); | 
 |   int16x4_t res1 = vshrn_n_s32(sum1, 2 * FILTER_BITS - ROUND0_BITS); | 
 |  | 
 |   return vqmovun_s16(vcombine_s16(res0, res1)); | 
 | } | 
 |  | 
 | static inline void convolve_vert_scale_8tap_neon( | 
 |     const int16_t *src, int src_stride, uint8_t *dst, int dst_stride, int w, | 
 |     int h, const int16_t *y_filter, int subpel_y_qn, int y_step_qn) { | 
 |   const int bd = 8; | 
 |   const int offset_bits = bd + 2 * FILTER_BITS - ROUND0_BITS; | 
 |   const int round_1 = 2 * FILTER_BITS - ROUND0_BITS; | 
 |   // The shim of 1 << (round_1 - 1) enables us to use non-rounding shifts. | 
 |   int32x4_t vert_offset = | 
 |       vdupq_n_s32((1 << (round_1 - 1)) - (1 << (offset_bits - 1))); | 
 |  | 
 |   int y_qn = subpel_y_qn; | 
 |   if (w == 4) { | 
 |     do { | 
 |       const int16_t *s = &src[(y_qn >> SCALE_SUBPEL_BITS) * src_stride]; | 
 |  | 
 |       const ptrdiff_t filter_offset = | 
 |           SUBPEL_TAPS * ((y_qn & SCALE_SUBPEL_MASK) >> SCALE_EXTRA_BITS); | 
 |       const int16x8_t filter = vld1q_s16(y_filter + filter_offset); | 
 |  | 
 |       int16x4_t s0, s1, s2, s3, s4, s5, s6, s7; | 
 |       load_s16_4x8(s, src_stride, &s0, &s1, &s2, &s3, &s4, &s5, &s6, &s7); | 
 |  | 
 |       uint8x8_t d = | 
 |           convolve8_4_v(s0, s1, s2, s3, s4, s5, s6, s7, filter, vert_offset); | 
 |  | 
 |       store_u8_4x1(dst, d); | 
 |  | 
 |       dst += dst_stride; | 
 |       y_qn += y_step_qn; | 
 |     } while (--h != 0); | 
 |   } else if (w == 8) { | 
 |     do { | 
 |       const int16_t *s = &src[(y_qn >> SCALE_SUBPEL_BITS) * src_stride]; | 
 |  | 
 |       const ptrdiff_t filter_offset = | 
 |           SUBPEL_TAPS * ((y_qn & SCALE_SUBPEL_MASK) >> SCALE_EXTRA_BITS); | 
 |       const int16x8_t filter = vld1q_s16(y_filter + filter_offset); | 
 |  | 
 |       int16x8_t s0, s1, s2, s3, s4, s5, s6, s7; | 
 |       load_s16_8x8(s, src_stride, &s0, &s1, &s2, &s3, &s4, &s5, &s6, &s7); | 
 |  | 
 |       uint8x8_t d = | 
 |           convolve8_8_v(s0, s1, s2, s3, s4, s5, s6, s7, filter, vert_offset); | 
 |  | 
 |       vst1_u8(dst, d); | 
 |  | 
 |       dst += dst_stride; | 
 |       y_qn += y_step_qn; | 
 |     } while (--h != 0); | 
 |   } else { | 
 |     do { | 
 |       const int16_t *s = &src[(y_qn >> SCALE_SUBPEL_BITS) * src_stride]; | 
 |       uint8_t *d = dst; | 
 |       int width = w; | 
 |  | 
 |       const ptrdiff_t filter_offset = | 
 |           SUBPEL_TAPS * ((y_qn & SCALE_SUBPEL_MASK) >> SCALE_EXTRA_BITS); | 
 |       const int16x8_t filter = vld1q_s16(y_filter + filter_offset); | 
 |  | 
 |       do { | 
 |         int16x8_t s0[2], s1[2], s2[2], s3[2], s4[2], s5[2], s6[2], s7[2]; | 
 |         load_s16_8x8(s, src_stride, &s0[0], &s1[0], &s2[0], &s3[0], &s4[0], | 
 |                      &s5[0], &s6[0], &s7[0]); | 
 |         load_s16_8x8(s + 8, src_stride, &s0[1], &s1[1], &s2[1], &s3[1], &s4[1], | 
 |                      &s5[1], &s6[1], &s7[1]); | 
 |  | 
 |         uint8x8_t d0 = convolve8_8_v(s0[0], s1[0], s2[0], s3[0], s4[0], s5[0], | 
 |                                      s6[0], s7[0], filter, vert_offset); | 
 |         uint8x8_t d1 = convolve8_8_v(s0[1], s1[1], s2[1], s3[1], s4[1], s5[1], | 
 |                                      s6[1], s7[1], filter, vert_offset); | 
 |  | 
 |         vst1q_u8(d, vcombine_u8(d0, d1)); | 
 |  | 
 |         s += 16; | 
 |         d += 16; | 
 |         width -= 16; | 
 |       } while (width != 0); | 
 |  | 
 |       dst += dst_stride; | 
 |       y_qn += y_step_qn; | 
 |     } while (--h != 0); | 
 |   } | 
 | } | 
 |  | 
 | static inline int16x4_t compound_convolve6_4_v( | 
 |     const int16x4_t s0, const int16x4_t s1, const int16x4_t s2, | 
 |     const int16x4_t s3, const int16x4_t s4, const int16x4_t s5, | 
 |     const int16x8_t filter, const int32x4_t offset_const) { | 
 |   const int16x4_t filter_0_3 = vget_low_s16(filter); | 
 |   const int16x4_t filter_4_7 = vget_high_s16(filter); | 
 |  | 
 |   int32x4_t sum = offset_const; | 
 |   // Filter values at indices 0 and 7 are 0. | 
 |   sum = vmlal_lane_s16(sum, s0, filter_0_3, 1); | 
 |   sum = vmlal_lane_s16(sum, s1, filter_0_3, 2); | 
 |   sum = vmlal_lane_s16(sum, s2, filter_0_3, 3); | 
 |   sum = vmlal_lane_s16(sum, s3, filter_4_7, 0); | 
 |   sum = vmlal_lane_s16(sum, s4, filter_4_7, 1); | 
 |   sum = vmlal_lane_s16(sum, s5, filter_4_7, 2); | 
 |  | 
 |   return vshrn_n_s32(sum, COMPOUND_ROUND1_BITS); | 
 | } | 
 |  | 
 | static inline int16x8_t compound_convolve6_8_v( | 
 |     const int16x8_t s0, const int16x8_t s1, const int16x8_t s2, | 
 |     const int16x8_t s3, const int16x8_t s4, const int16x8_t s5, | 
 |     const int16x8_t filter, const int32x4_t offset_const) { | 
 |   const int16x4_t filter_0_3 = vget_low_s16(filter); | 
 |   const int16x4_t filter_4_7 = vget_high_s16(filter); | 
 |  | 
 |   int32x4_t sum0 = offset_const; | 
 |   // Filter values at indices 0 and 7 are 0. | 
 |   sum0 = vmlal_lane_s16(sum0, vget_low_s16(s0), filter_0_3, 1); | 
 |   sum0 = vmlal_lane_s16(sum0, vget_low_s16(s1), filter_0_3, 2); | 
 |   sum0 = vmlal_lane_s16(sum0, vget_low_s16(s2), filter_0_3, 3); | 
 |   sum0 = vmlal_lane_s16(sum0, vget_low_s16(s3), filter_4_7, 0); | 
 |   sum0 = vmlal_lane_s16(sum0, vget_low_s16(s4), filter_4_7, 1); | 
 |   sum0 = vmlal_lane_s16(sum0, vget_low_s16(s5), filter_4_7, 2); | 
 |  | 
 |   int32x4_t sum1 = offset_const; | 
 |   sum1 = vmlal_lane_s16(sum1, vget_high_s16(s0), filter_0_3, 1); | 
 |   sum1 = vmlal_lane_s16(sum1, vget_high_s16(s1), filter_0_3, 2); | 
 |   sum1 = vmlal_lane_s16(sum1, vget_high_s16(s2), filter_0_3, 3); | 
 |   sum1 = vmlal_lane_s16(sum1, vget_high_s16(s3), filter_4_7, 0); | 
 |   sum1 = vmlal_lane_s16(sum1, vget_high_s16(s4), filter_4_7, 1); | 
 |   sum1 = vmlal_lane_s16(sum1, vget_high_s16(s5), filter_4_7, 2); | 
 |  | 
 |   int16x4_t res0 = vshrn_n_s32(sum0, COMPOUND_ROUND1_BITS); | 
 |   int16x4_t res1 = vshrn_n_s32(sum1, COMPOUND_ROUND1_BITS); | 
 |  | 
 |   return vcombine_s16(res0, res1); | 
 | } | 
 |  | 
 | static inline void compound_convolve_vert_scale_6tap_neon( | 
 |     const int16_t *src, int src_stride, uint16_t *dst, int dst_stride, int w, | 
 |     int h, const int16_t *y_filter, int subpel_y_qn, int y_step_qn) { | 
 |   const int bd = 8; | 
 |   const int offset_bits = bd + 2 * FILTER_BITS - ROUND0_BITS; | 
 |   // A shim of 1 << (COMPOUND_ROUND1_BITS - 1) enables us to use | 
 |   // non-rounding shifts - which are generally faster than rounding shifts on | 
 |   // modern CPUs. | 
 |   const int32x4_t vert_offset = | 
 |       vdupq_n_s32((1 << offset_bits) + (1 << (COMPOUND_ROUND1_BITS - 1))); | 
 |  | 
 |   int y_qn = subpel_y_qn; | 
 |  | 
 |   if (w == 4) { | 
 |     do { | 
 |       const int16_t *s = &src[(y_qn >> SCALE_SUBPEL_BITS) * src_stride]; | 
 |  | 
 |       const ptrdiff_t filter_offset = | 
 |           SUBPEL_TAPS * ((y_qn & SCALE_SUBPEL_MASK) >> SCALE_EXTRA_BITS); | 
 |       const int16x8_t filter = vld1q_s16(y_filter + filter_offset); | 
 |  | 
 |       int16x4_t s0, s1, s2, s3, s4, s5; | 
 |       load_s16_4x6(s, src_stride, &s0, &s1, &s2, &s3, &s4, &s5); | 
 |  | 
 |       int16x4_t d0 = | 
 |           compound_convolve6_4_v(s0, s1, s2, s3, s4, s5, filter, vert_offset); | 
 |  | 
 |       vst1_u16(dst, vreinterpret_u16_s16(d0)); | 
 |  | 
 |       dst += dst_stride; | 
 |       y_qn += y_step_qn; | 
 |     } while (--h != 0); | 
 |   } else { | 
 |     do { | 
 |       const int16_t *s = &src[(y_qn >> SCALE_SUBPEL_BITS) * src_stride]; | 
 |  | 
 |       const ptrdiff_t filter_offset = | 
 |           SUBPEL_TAPS * ((y_qn & SCALE_SUBPEL_MASK) >> SCALE_EXTRA_BITS); | 
 |       const int16x8_t filter = vld1q_s16(y_filter + filter_offset); | 
 |  | 
 |       int width = w; | 
 |       uint16_t *d = dst; | 
 |  | 
 |       do { | 
 |         int16x8_t s0, s1, s2, s3, s4, s5; | 
 |         load_s16_8x6(s, src_stride, &s0, &s1, &s2, &s3, &s4, &s5); | 
 |  | 
 |         int16x8_t d0 = | 
 |             compound_convolve6_8_v(s0, s1, s2, s3, s4, s5, filter, vert_offset); | 
 |  | 
 |         vst1q_u16(d, vreinterpretq_u16_s16(d0)); | 
 |  | 
 |         s += 8; | 
 |         d += 8; | 
 |         width -= 8; | 
 |       } while (width != 0); | 
 |  | 
 |       dst += dst_stride; | 
 |       y_qn += y_step_qn; | 
 |     } while (--h != 0); | 
 |   } | 
 | } | 
 |  | 
 | static inline void compound_avg_convolve_vert_scale_6tap_neon( | 
 |     const int16_t *src, int src_stride, uint8_t *dst8, int dst8_stride, | 
 |     uint16_t *dst16, int dst16_stride, int w, int h, const int16_t *y_filter, | 
 |     int subpel_y_qn, int y_step_qn) { | 
 |   const int bd = 8; | 
 |   const int offset_bits = bd + 2 * FILTER_BITS - ROUND0_BITS; | 
 |   // A shim of 1 << (COMPOUND_ROUND1_BITS - 1) enables us to use | 
 |   // non-rounding shifts - which are generally faster than rounding shifts | 
 |   // on modern CPUs. | 
 |   const int32_t vert_offset_bits = | 
 |       (1 << offset_bits) + (1 << (COMPOUND_ROUND1_BITS - 1)); | 
 |   // For the averaging code path substract round offset and convolve round. | 
 |   const int32_t avg_offset_bits = (1 << (offset_bits + 1)) + (1 << offset_bits); | 
 |   const int32x4_t vert_offset = vdupq_n_s32(vert_offset_bits - avg_offset_bits); | 
 |  | 
 |   int y_qn = subpel_y_qn; | 
 |  | 
 |   if (w == 4) { | 
 |     do { | 
 |       const int16_t *s = &src[(y_qn >> SCALE_SUBPEL_BITS) * src_stride]; | 
 |  | 
 |       const ptrdiff_t filter_offset = | 
 |           SUBPEL_TAPS * ((y_qn & SCALE_SUBPEL_MASK) >> SCALE_EXTRA_BITS); | 
 |       const int16x8_t filter = vld1q_s16(y_filter + filter_offset); | 
 |  | 
 |       int16x4_t s0, s1, s2, s3, s4, s5; | 
 |       load_s16_4x6(s, src_stride, &s0, &s1, &s2, &s3, &s4, &s5); | 
 |  | 
 |       int16x4_t d0 = | 
 |           compound_convolve6_4_v(s0, s1, s2, s3, s4, s5, filter, vert_offset); | 
 |  | 
 |       int16x4_t dd0 = vreinterpret_s16_u16(vld1_u16(dst16)); | 
 |  | 
 |       int16x4_t avg = vhadd_s16(dd0, d0); | 
 |       int16x8_t d0_s16 = vcombine_s16(avg, vdup_n_s16(0)); | 
 |  | 
 |       uint8x8_t d0_u8 = vqrshrun_n_s16( | 
 |           d0_s16, 2 * FILTER_BITS - ROUND0_BITS - COMPOUND_ROUND1_BITS); | 
 |  | 
 |       store_u8_4x1(dst8, d0_u8); | 
 |  | 
 |       dst16 += dst16_stride; | 
 |       dst8 += dst8_stride; | 
 |       y_qn += y_step_qn; | 
 |     } while (--h != 0); | 
 |   } else { | 
 |     do { | 
 |       const int16_t *s = &src[(y_qn >> SCALE_SUBPEL_BITS) * src_stride]; | 
 |  | 
 |       const ptrdiff_t filter_offset = | 
 |           SUBPEL_TAPS * ((y_qn & SCALE_SUBPEL_MASK) >> SCALE_EXTRA_BITS); | 
 |       const int16x8_t filter = vld1q_s16(y_filter + filter_offset); | 
 |  | 
 |       int width = w; | 
 |       uint8_t *dst8_ptr = dst8; | 
 |       uint16_t *dst16_ptr = dst16; | 
 |  | 
 |       do { | 
 |         int16x8_t s0, s1, s2, s3, s4, s5; | 
 |         load_s16_8x6(s, src_stride, &s0, &s1, &s2, &s3, &s4, &s5); | 
 |  | 
 |         int16x8_t d0 = | 
 |             compound_convolve6_8_v(s0, s1, s2, s3, s4, s5, filter, vert_offset); | 
 |  | 
 |         int16x8_t dd0 = vreinterpretq_s16_u16(vld1q_u16(dst16_ptr)); | 
 |  | 
 |         int16x8_t avg = vhaddq_s16(dd0, d0); | 
 |  | 
 |         uint8x8_t d0_u8 = vqrshrun_n_s16( | 
 |             avg, 2 * FILTER_BITS - ROUND0_BITS - COMPOUND_ROUND1_BITS); | 
 |  | 
 |         vst1_u8(dst8_ptr, d0_u8); | 
 |  | 
 |         s += 8; | 
 |         dst8_ptr += 8; | 
 |         dst16_ptr += 8; | 
 |         width -= 8; | 
 |       } while (width != 0); | 
 |  | 
 |       dst16 += dst16_stride; | 
 |       dst8 += dst8_stride; | 
 |       y_qn += y_step_qn; | 
 |     } while (--h != 0); | 
 |   } | 
 | } | 
 |  | 
 | static inline void compound_dist_wtd_convolve_vert_scale_6tap_neon( | 
 |     const int16_t *src, int src_stride, uint8_t *dst8, int dst8_stride, | 
 |     uint16_t *dst16, int dst16_stride, int w, int h, const int16_t *y_filter, | 
 |     ConvolveParams *conv_params, int subpel_y_qn, int y_step_qn) { | 
 |   const int bd = 8; | 
 |   const int offset_bits = bd + 2 * FILTER_BITS - ROUND0_BITS; | 
 |   int y_qn = subpel_y_qn; | 
 |   // A shim of 1 << (COMPOUND_ROUND1_BITS - 1) enables us to use | 
 |   // non-rounding shifts - which are generally faster than rounding shifts on | 
 |   // modern CPUs. | 
 |   const int32x4_t vert_offset = | 
 |       vdupq_n_s32((1 << offset_bits) + (1 << (COMPOUND_ROUND1_BITS - 1))); | 
 |   // For the weighted averaging code path we have to substract round offset and | 
 |   // convolve round. The shim of 1 << (2 * FILTER_BITS - ROUND0_BITS - | 
 |   // COMPOUND_ROUND1_BITS - 1) enables us to use non-rounding shifts. The | 
 |   // additional shift by DIST_PRECISION_BITS is needed in order to merge two | 
 |   // shift calculations into one. | 
 |   const int32x4_t dist_wtd_offset = vdupq_n_s32( | 
 |       (1 << (2 * FILTER_BITS - ROUND0_BITS - COMPOUND_ROUND1_BITS - 1 + | 
 |              DIST_PRECISION_BITS)) - | 
 |       (1 << (offset_bits - COMPOUND_ROUND1_BITS + DIST_PRECISION_BITS)) - | 
 |       (1 << (offset_bits - COMPOUND_ROUND1_BITS - 1 + DIST_PRECISION_BITS))); | 
 |   const int16x4_t bck_offset = vdup_n_s16(conv_params->bck_offset); | 
 |   const int16x4_t fwd_offset = vdup_n_s16(conv_params->fwd_offset); | 
 |  | 
 |   if (w == 4) { | 
 |     do { | 
 |       const int16_t *s = &src[(y_qn >> SCALE_SUBPEL_BITS) * src_stride]; | 
 |  | 
 |       const ptrdiff_t filter_offset = | 
 |           SUBPEL_TAPS * ((y_qn & SCALE_SUBPEL_MASK) >> SCALE_EXTRA_BITS); | 
 |       const int16x8_t filter = vld1q_s16(y_filter + filter_offset); | 
 |  | 
 |       int16x4_t s0, s1, s2, s3, s4, s5; | 
 |       load_s16_4x6(s, src_stride, &s0, &s1, &s2, &s3, &s4, &s5); | 
 |  | 
 |       int16x4_t d0 = | 
 |           compound_convolve6_4_v(s0, s1, s2, s3, s4, s5, filter, vert_offset); | 
 |  | 
 |       int16x4_t dd0 = vreinterpret_s16_u16(vld1_u16(dst16)); | 
 |  | 
 |       int32x4_t dst_wtd_avg = vmlal_s16(dist_wtd_offset, bck_offset, d0); | 
 |       dst_wtd_avg = vmlal_s16(dst_wtd_avg, fwd_offset, dd0); | 
 |  | 
 |       int16x4_t d0_s16 = vshrn_n_s32( | 
 |           dst_wtd_avg, 2 * FILTER_BITS - ROUND0_BITS - COMPOUND_ROUND1_BITS + | 
 |                            DIST_PRECISION_BITS); | 
 |  | 
 |       uint8x8_t d0_u8 = vqmovun_s16(vcombine_s16(d0_s16, vdup_n_s16(0))); | 
 |  | 
 |       store_u8_4x1(dst8, d0_u8); | 
 |  | 
 |       dst16 += dst16_stride; | 
 |       dst8 += dst8_stride; | 
 |       y_qn += y_step_qn; | 
 |     } while (--h != 0); | 
 |   } else { | 
 |     do { | 
 |       const int16_t *s = &src[(y_qn >> SCALE_SUBPEL_BITS) * src_stride]; | 
 |  | 
 |       const ptrdiff_t filter_offset = | 
 |           SUBPEL_TAPS * ((y_qn & SCALE_SUBPEL_MASK) >> SCALE_EXTRA_BITS); | 
 |       const int16x8_t filter = vld1q_s16(y_filter + filter_offset); | 
 |  | 
 |       int width = w; | 
 |       uint8_t *dst8_ptr = dst8; | 
 |       uint16_t *dst16_ptr = dst16; | 
 |  | 
 |       do { | 
 |         int16x8_t s0, s1, s2, s3, s4, s5; | 
 |         load_s16_8x6(s, src_stride, &s0, &s1, &s2, &s3, &s4, &s5); | 
 |  | 
 |         int16x8_t d0 = | 
 |             compound_convolve6_8_v(s0, s1, s2, s3, s4, s5, filter, vert_offset); | 
 |  | 
 |         int16x8_t dd0 = vreinterpretq_s16_u16(vld1q_u16(dst16_ptr)); | 
 |  | 
 |         int32x4_t dst_wtd_avg0 = | 
 |             vmlal_s16(dist_wtd_offset, bck_offset, vget_low_s16(d0)); | 
 |         int32x4_t dst_wtd_avg1 = | 
 |             vmlal_s16(dist_wtd_offset, bck_offset, vget_high_s16(d0)); | 
 |  | 
 |         dst_wtd_avg0 = vmlal_s16(dst_wtd_avg0, fwd_offset, vget_low_s16(dd0)); | 
 |         dst_wtd_avg1 = vmlal_s16(dst_wtd_avg1, fwd_offset, vget_high_s16(dd0)); | 
 |  | 
 |         int16x4_t d0_s16_0 = vshrn_n_s32( | 
 |             dst_wtd_avg0, 2 * FILTER_BITS - ROUND0_BITS - COMPOUND_ROUND1_BITS + | 
 |                               DIST_PRECISION_BITS); | 
 |         int16x4_t d0_s16_1 = vshrn_n_s32( | 
 |             dst_wtd_avg1, 2 * FILTER_BITS - ROUND0_BITS - COMPOUND_ROUND1_BITS + | 
 |                               DIST_PRECISION_BITS); | 
 |  | 
 |         uint8x8_t d0_u8 = vqmovun_s16(vcombine_s16(d0_s16_0, d0_s16_1)); | 
 |  | 
 |         vst1_u8(dst8_ptr, d0_u8); | 
 |  | 
 |         s += 8; | 
 |         dst8_ptr += 8; | 
 |         dst16_ptr += 8; | 
 |         width -= 8; | 
 |       } while (width != 0); | 
 |  | 
 |       dst16 += dst16_stride; | 
 |       dst8 += dst8_stride; | 
 |       y_qn += y_step_qn; | 
 |     } while (--h != 0); | 
 |   } | 
 | } | 
 |  | 
 | static inline uint8x8_t convolve6_4_v(const int16x4_t s0, const int16x4_t s1, | 
 |                                       const int16x4_t s2, const int16x4_t s3, | 
 |                                       const int16x4_t s4, const int16x4_t s5, | 
 |                                       const int16x8_t filter, | 
 |                                       const int32x4_t offset_const) { | 
 |   const int16x4_t filter_0_3 = vget_low_s16(filter); | 
 |   const int16x4_t filter_4_7 = vget_high_s16(filter); | 
 |  | 
 |   int32x4_t sum = offset_const; | 
 |   // Filter values at indices 0 and 7 are 0. | 
 |   sum = vmlal_lane_s16(sum, s0, filter_0_3, 1); | 
 |   sum = vmlal_lane_s16(sum, s1, filter_0_3, 2); | 
 |   sum = vmlal_lane_s16(sum, s2, filter_0_3, 3); | 
 |   sum = vmlal_lane_s16(sum, s3, filter_4_7, 0); | 
 |   sum = vmlal_lane_s16(sum, s4, filter_4_7, 1); | 
 |   sum = vmlal_lane_s16(sum, s5, filter_4_7, 2); | 
 |  | 
 |   int16x4_t res = vshrn_n_s32(sum, 2 * FILTER_BITS - ROUND0_BITS); | 
 |  | 
 |   return vqmovun_s16(vcombine_s16(res, vdup_n_s16(0))); | 
 | } | 
 |  | 
 | static inline uint8x8_t convolve6_8_v(const int16x8_t s0, const int16x8_t s1, | 
 |                                       const int16x8_t s2, const int16x8_t s3, | 
 |                                       const int16x8_t s4, const int16x8_t s5, | 
 |                                       const int16x8_t filter, | 
 |                                       const int32x4_t offset_const) { | 
 |   const int16x4_t filter_0_3 = vget_low_s16(filter); | 
 |   const int16x4_t filter_4_7 = vget_high_s16(filter); | 
 |  | 
 |   int32x4_t sum0 = offset_const; | 
 |   // Filter values at indices 0 and 7 are 0. | 
 |   sum0 = vmlal_lane_s16(sum0, vget_low_s16(s0), filter_0_3, 1); | 
 |   sum0 = vmlal_lane_s16(sum0, vget_low_s16(s1), filter_0_3, 2); | 
 |   sum0 = vmlal_lane_s16(sum0, vget_low_s16(s2), filter_0_3, 3); | 
 |   sum0 = vmlal_lane_s16(sum0, vget_low_s16(s3), filter_4_7, 0); | 
 |   sum0 = vmlal_lane_s16(sum0, vget_low_s16(s4), filter_4_7, 1); | 
 |   sum0 = vmlal_lane_s16(sum0, vget_low_s16(s5), filter_4_7, 2); | 
 |  | 
 |   int32x4_t sum1 = offset_const; | 
 |   sum1 = vmlal_lane_s16(sum1, vget_high_s16(s0), filter_0_3, 1); | 
 |   sum1 = vmlal_lane_s16(sum1, vget_high_s16(s1), filter_0_3, 2); | 
 |   sum1 = vmlal_lane_s16(sum1, vget_high_s16(s2), filter_0_3, 3); | 
 |   sum1 = vmlal_lane_s16(sum1, vget_high_s16(s3), filter_4_7, 0); | 
 |   sum1 = vmlal_lane_s16(sum1, vget_high_s16(s4), filter_4_7, 1); | 
 |   sum1 = vmlal_lane_s16(sum1, vget_high_s16(s5), filter_4_7, 2); | 
 |  | 
 |   int16x4_t res0 = vshrn_n_s32(sum0, 2 * FILTER_BITS - ROUND0_BITS); | 
 |   int16x4_t res1 = vshrn_n_s32(sum1, 2 * FILTER_BITS - ROUND0_BITS); | 
 |  | 
 |   return vqmovun_s16(vcombine_s16(res0, res1)); | 
 | } | 
 |  | 
 | static inline void convolve_vert_scale_6tap_neon( | 
 |     const int16_t *src, int src_stride, uint8_t *dst, int dst_stride, int w, | 
 |     int h, const int16_t *y_filter, int subpel_y_qn, int y_step_qn) { | 
 |   const int bd = 8; | 
 |   const int offset_bits = bd + 2 * FILTER_BITS - ROUND0_BITS; | 
 |   const int round_1 = 2 * FILTER_BITS - ROUND0_BITS; | 
 |   // The shim of 1 << (round_1 - 1) enables us to use non-rounding shifts. | 
 |   int32x4_t vert_offset = | 
 |       vdupq_n_s32((1 << (round_1 - 1)) - (1 << (offset_bits - 1))); | 
 |  | 
 |   int y_qn = subpel_y_qn; | 
 |   if (w == 4) { | 
 |     do { | 
 |       const int16_t *s = &src[(y_qn >> SCALE_SUBPEL_BITS) * src_stride]; | 
 |  | 
 |       const ptrdiff_t filter_offset = | 
 |           SUBPEL_TAPS * ((y_qn & SCALE_SUBPEL_MASK) >> SCALE_EXTRA_BITS); | 
 |       const int16x8_t filter = vld1q_s16(y_filter + filter_offset); | 
 |  | 
 |       int16x4_t s0, s1, s2, s3, s4, s5; | 
 |       load_s16_4x6(s, src_stride, &s0, &s1, &s2, &s3, &s4, &s5); | 
 |  | 
 |       uint8x8_t d = convolve6_4_v(s0, s1, s2, s3, s4, s5, filter, vert_offset); | 
 |  | 
 |       store_u8_4x1(dst, d); | 
 |  | 
 |       dst += dst_stride; | 
 |       y_qn += y_step_qn; | 
 |     } while (--h != 0); | 
 |   } else if (w == 8) { | 
 |     do { | 
 |       const int16_t *s = &src[(y_qn >> SCALE_SUBPEL_BITS) * src_stride]; | 
 |  | 
 |       const ptrdiff_t filter_offset = | 
 |           SUBPEL_TAPS * ((y_qn & SCALE_SUBPEL_MASK) >> SCALE_EXTRA_BITS); | 
 |       const int16x8_t filter = vld1q_s16(y_filter + filter_offset); | 
 |  | 
 |       int16x8_t s0, s1, s2, s3, s4, s5; | 
 |       load_s16_8x6(s, src_stride, &s0, &s1, &s2, &s3, &s4, &s5); | 
 |  | 
 |       uint8x8_t d = convolve6_8_v(s0, s1, s2, s3, s4, s5, filter, vert_offset); | 
 |  | 
 |       vst1_u8(dst, d); | 
 |  | 
 |       dst += dst_stride; | 
 |       y_qn += y_step_qn; | 
 |     } while (--h != 0); | 
 |   } else { | 
 |     do { | 
 |       const int16_t *s = &src[(y_qn >> SCALE_SUBPEL_BITS) * src_stride]; | 
 |       uint8_t *d = dst; | 
 |       int width = w; | 
 |  | 
 |       const ptrdiff_t filter_offset = | 
 |           SUBPEL_TAPS * ((y_qn & SCALE_SUBPEL_MASK) >> SCALE_EXTRA_BITS); | 
 |       const int16x8_t filter = vld1q_s16(y_filter + filter_offset); | 
 |  | 
 |       do { | 
 |         int16x8_t s0[2], s1[2], s2[2], s3[2], s4[2], s5[2]; | 
 |         load_s16_8x6(s, src_stride, &s0[0], &s1[0], &s2[0], &s3[0], &s4[0], | 
 |                      &s5[0]); | 
 |         load_s16_8x6(s + 8, src_stride, &s0[1], &s1[1], &s2[1], &s3[1], &s4[1], | 
 |                      &s5[1]); | 
 |  | 
 |         uint8x8_t d0 = convolve6_8_v(s0[0], s1[0], s2[0], s3[0], s4[0], s5[0], | 
 |                                      filter, vert_offset); | 
 |         uint8x8_t d1 = convolve6_8_v(s0[1], s1[1], s2[1], s3[1], s4[1], s5[1], | 
 |                                      filter, vert_offset); | 
 |  | 
 |         vst1q_u8(d, vcombine_u8(d0, d1)); | 
 |  | 
 |         s += 16; | 
 |         d += 16; | 
 |         width -= 16; | 
 |       } while (width != 0); | 
 |  | 
 |       dst += dst_stride; | 
 |       y_qn += y_step_qn; | 
 |     } while (--h != 0); | 
 |   } | 
 | } | 
 |  | 
 | #endif  // AOM_AV1_COMMON_ARM_CONVOLVE_SCALE_NEON_H_ |