| /* |
| * Copyright (c) 2016, 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_dsp_rtcd.h" |
| #include "config/aom_config.h" |
| #include "aom_dsp/arm/sum_neon.h" |
| #include "aom/aom_integer.h" |
| #include "aom_ports/mem.h" |
| |
| // w * h must be less than 2048 or local variable v_sum may overflow. |
| static void variance_neon_w8(const uint8_t *a, int a_stride, const uint8_t *b, |
| int b_stride, int w, int h, uint32_t *sse, |
| int *sum) { |
| int i, j; |
| int16x8_t v_sum = vdupq_n_s16(0); |
| int32x4_t v_sse_lo = vdupq_n_s32(0); |
| int32x4_t v_sse_hi = vdupq_n_s32(0); |
| |
| for (i = 0; i < h; ++i) { |
| for (j = 0; j < w; j += 8) { |
| const uint8x8_t v_a = vld1_u8(&a[j]); |
| const uint8x8_t v_b = vld1_u8(&b[j]); |
| const uint16x8_t v_diff = vsubl_u8(v_a, v_b); |
| const int16x8_t sv_diff = vreinterpretq_s16_u16(v_diff); |
| v_sum = vaddq_s16(v_sum, sv_diff); |
| v_sse_lo = |
| vmlal_s16(v_sse_lo, vget_low_s16(sv_diff), vget_low_s16(sv_diff)); |
| v_sse_hi = |
| vmlal_s16(v_sse_hi, vget_high_s16(sv_diff), vget_high_s16(sv_diff)); |
| } |
| a += a_stride; |
| b += b_stride; |
| } |
| |
| *sum = horizontal_add_s16x8(v_sum); |
| *sse = (unsigned int)horizontal_add_s32x4(vaddq_s32(v_sse_lo, v_sse_hi)); |
| } |
| |
| void aom_get8x8var_neon(const uint8_t *a, int a_stride, const uint8_t *b, |
| int b_stride, unsigned int *sse, int *sum) { |
| variance_neon_w8(a, a_stride, b, b_stride, 8, 8, sse, sum); |
| } |
| |
| void aom_get16x16var_neon(const uint8_t *a, int a_stride, const uint8_t *b, |
| int b_stride, unsigned int *sse, int *sum) { |
| variance_neon_w8(a, a_stride, b, b_stride, 16, 16, sse, sum); |
| } |
| |
| unsigned int aom_variance8x8_neon(const uint8_t *a, int a_stride, |
| const uint8_t *b, int b_stride, |
| unsigned int *sse) { |
| int sum; |
| variance_neon_w8(a, a_stride, b, b_stride, 8, 8, sse, &sum); |
| return *sse - ((sum * sum) >> 6); |
| } |
| |
| unsigned int aom_variance16x16_neon(const uint8_t *a, int a_stride, |
| const uint8_t *b, int b_stride, |
| unsigned int *sse) { |
| int sum; |
| variance_neon_w8(a, a_stride, b, b_stride, 16, 16, sse, &sum); |
| return *sse - (((unsigned int)((int64_t)sum * sum)) >> 8); |
| } |
| |
| unsigned int aom_variance32x32_neon(const uint8_t *a, int a_stride, |
| const uint8_t *b, int b_stride, |
| unsigned int *sse) { |
| int sum; |
| variance_neon_w8(a, a_stride, b, b_stride, 32, 32, sse, &sum); |
| return *sse - (unsigned int)(((int64_t)sum * sum) >> 10); |
| } |
| |
| unsigned int aom_variance32x64_neon(const uint8_t *a, int a_stride, |
| const uint8_t *b, int b_stride, |
| unsigned int *sse) { |
| int sum1, sum2; |
| uint32_t sse1, sse2; |
| variance_neon_w8(a, a_stride, b, b_stride, 32, 32, &sse1, &sum1); |
| variance_neon_w8(a + (32 * a_stride), a_stride, b + (32 * b_stride), b_stride, |
| 32, 32, &sse2, &sum2); |
| *sse = sse1 + sse2; |
| sum1 += sum2; |
| return *sse - (unsigned int)(((int64_t)sum1 * sum1) >> 11); |
| } |
| |
| unsigned int aom_variance64x32_neon(const uint8_t *a, int a_stride, |
| const uint8_t *b, int b_stride, |
| unsigned int *sse) { |
| int sum1, sum2; |
| uint32_t sse1, sse2; |
| variance_neon_w8(a, a_stride, b, b_stride, 64, 16, &sse1, &sum1); |
| variance_neon_w8(a + (16 * a_stride), a_stride, b + (16 * b_stride), b_stride, |
| 64, 16, &sse2, &sum2); |
| *sse = sse1 + sse2; |
| sum1 += sum2; |
| return *sse - (unsigned int)(((int64_t)sum1 * sum1) >> 11); |
| } |
| |
| unsigned int aom_variance64x64_neon(const uint8_t *a, int a_stride, |
| const uint8_t *b, int b_stride, |
| unsigned int *sse) { |
| int sum1, sum2; |
| uint32_t sse1, sse2; |
| |
| variance_neon_w8(a, a_stride, b, b_stride, 64, 16, &sse1, &sum1); |
| variance_neon_w8(a + (16 * a_stride), a_stride, b + (16 * b_stride), b_stride, |
| 64, 16, &sse2, &sum2); |
| sse1 += sse2; |
| sum1 += sum2; |
| |
| variance_neon_w8(a + (16 * 2 * a_stride), a_stride, b + (16 * 2 * b_stride), |
| b_stride, 64, 16, &sse2, &sum2); |
| sse1 += sse2; |
| sum1 += sum2; |
| |
| variance_neon_w8(a + (16 * 3 * a_stride), a_stride, b + (16 * 3 * b_stride), |
| b_stride, 64, 16, &sse2, &sum2); |
| *sse = sse1 + sse2; |
| sum1 += sum2; |
| return *sse - (unsigned int)(((int64_t)sum1 * sum1) >> 12); |
| } |
| |
| unsigned int aom_variance128x128_neon(const uint8_t *a, int a_stride, |
| const uint8_t *b, int b_stride, |
| unsigned int *sse) { |
| int sum1, sum2; |
| uint32_t sse1, sse2; |
| sum1 = sse1 = 0; |
| for (int i = 0; i < 16; i++) { |
| variance_neon_w8(a + (8 * i * a_stride), a_stride, b + (8 * i * b_stride), |
| b_stride, 128, 8, &sse2, &sum2); |
| sse1 += sse2; |
| sum1 += sum2; |
| } |
| |
| *sse = sse1; |
| |
| return *sse - (unsigned int)(((int64_t)sum1 * sum1) >> 14); |
| } |
| |
| unsigned int aom_variance16x8_neon(const unsigned char *src_ptr, |
| int source_stride, |
| const unsigned char *ref_ptr, |
| int recon_stride, unsigned int *sse) { |
| int i; |
| int16x4_t d22s16, d23s16, d24s16, d25s16, d26s16, d27s16, d28s16, d29s16; |
| uint32x2_t d0u32, d10u32; |
| int64x1_t d0s64, d1s64; |
| uint8x16_t q0u8, q1u8, q2u8, q3u8; |
| uint16x8_t q11u16, q12u16, q13u16, q14u16; |
| int32x4_t q8s32, q9s32, q10s32; |
| int64x2_t q0s64, q1s64, q5s64; |
| |
| q8s32 = vdupq_n_s32(0); |
| q9s32 = vdupq_n_s32(0); |
| q10s32 = vdupq_n_s32(0); |
| |
| for (i = 0; i < 4; i++) { |
| q0u8 = vld1q_u8(src_ptr); |
| src_ptr += source_stride; |
| q1u8 = vld1q_u8(src_ptr); |
| src_ptr += source_stride; |
| __builtin_prefetch(src_ptr); |
| |
| q2u8 = vld1q_u8(ref_ptr); |
| ref_ptr += recon_stride; |
| q3u8 = vld1q_u8(ref_ptr); |
| ref_ptr += recon_stride; |
| __builtin_prefetch(ref_ptr); |
| |
| q11u16 = vsubl_u8(vget_low_u8(q0u8), vget_low_u8(q2u8)); |
| q12u16 = vsubl_u8(vget_high_u8(q0u8), vget_high_u8(q2u8)); |
| q13u16 = vsubl_u8(vget_low_u8(q1u8), vget_low_u8(q3u8)); |
| q14u16 = vsubl_u8(vget_high_u8(q1u8), vget_high_u8(q3u8)); |
| |
| d22s16 = vreinterpret_s16_u16(vget_low_u16(q11u16)); |
| d23s16 = vreinterpret_s16_u16(vget_high_u16(q11u16)); |
| q8s32 = vpadalq_s16(q8s32, vreinterpretq_s16_u16(q11u16)); |
| q9s32 = vmlal_s16(q9s32, d22s16, d22s16); |
| q10s32 = vmlal_s16(q10s32, d23s16, d23s16); |
| |
| d24s16 = vreinterpret_s16_u16(vget_low_u16(q12u16)); |
| d25s16 = vreinterpret_s16_u16(vget_high_u16(q12u16)); |
| q8s32 = vpadalq_s16(q8s32, vreinterpretq_s16_u16(q12u16)); |
| q9s32 = vmlal_s16(q9s32, d24s16, d24s16); |
| q10s32 = vmlal_s16(q10s32, d25s16, d25s16); |
| |
| d26s16 = vreinterpret_s16_u16(vget_low_u16(q13u16)); |
| d27s16 = vreinterpret_s16_u16(vget_high_u16(q13u16)); |
| q8s32 = vpadalq_s16(q8s32, vreinterpretq_s16_u16(q13u16)); |
| q9s32 = vmlal_s16(q9s32, d26s16, d26s16); |
| q10s32 = vmlal_s16(q10s32, d27s16, d27s16); |
| |
| d28s16 = vreinterpret_s16_u16(vget_low_u16(q14u16)); |
| d29s16 = vreinterpret_s16_u16(vget_high_u16(q14u16)); |
| q8s32 = vpadalq_s16(q8s32, vreinterpretq_s16_u16(q14u16)); |
| q9s32 = vmlal_s16(q9s32, d28s16, d28s16); |
| q10s32 = vmlal_s16(q10s32, d29s16, d29s16); |
| } |
| |
| q10s32 = vaddq_s32(q10s32, q9s32); |
| q0s64 = vpaddlq_s32(q8s32); |
| q1s64 = vpaddlq_s32(q10s32); |
| |
| d0s64 = vadd_s64(vget_low_s64(q0s64), vget_high_s64(q0s64)); |
| d1s64 = vadd_s64(vget_low_s64(q1s64), vget_high_s64(q1s64)); |
| |
| q5s64 = vmull_s32(vreinterpret_s32_s64(d0s64), vreinterpret_s32_s64(d0s64)); |
| vst1_lane_u32((uint32_t *)sse, vreinterpret_u32_s64(d1s64), 0); |
| |
| d10u32 = vshr_n_u32(vreinterpret_u32_s64(vget_low_s64(q5s64)), 7); |
| d0u32 = vsub_u32(vreinterpret_u32_s64(d1s64), d10u32); |
| |
| return vget_lane_u32(d0u32, 0); |
| } |
| |
| unsigned int aom_variance8x16_neon(const unsigned char *src_ptr, |
| int source_stride, |
| const unsigned char *ref_ptr, |
| int recon_stride, unsigned int *sse) { |
| int i; |
| uint8x8_t d0u8, d2u8, d4u8, d6u8; |
| int16x4_t d22s16, d23s16, d24s16, d25s16; |
| uint32x2_t d0u32, d10u32; |
| int64x1_t d0s64, d1s64; |
| uint16x8_t q11u16, q12u16; |
| int32x4_t q8s32, q9s32, q10s32; |
| int64x2_t q0s64, q1s64, q5s64; |
| |
| q8s32 = vdupq_n_s32(0); |
| q9s32 = vdupq_n_s32(0); |
| q10s32 = vdupq_n_s32(0); |
| |
| for (i = 0; i < 8; i++) { |
| d0u8 = vld1_u8(src_ptr); |
| src_ptr += source_stride; |
| d2u8 = vld1_u8(src_ptr); |
| src_ptr += source_stride; |
| __builtin_prefetch(src_ptr); |
| |
| d4u8 = vld1_u8(ref_ptr); |
| ref_ptr += recon_stride; |
| d6u8 = vld1_u8(ref_ptr); |
| ref_ptr += recon_stride; |
| __builtin_prefetch(ref_ptr); |
| |
| q11u16 = vsubl_u8(d0u8, d4u8); |
| q12u16 = vsubl_u8(d2u8, d6u8); |
| |
| d22s16 = vreinterpret_s16_u16(vget_low_u16(q11u16)); |
| d23s16 = vreinterpret_s16_u16(vget_high_u16(q11u16)); |
| q8s32 = vpadalq_s16(q8s32, vreinterpretq_s16_u16(q11u16)); |
| q9s32 = vmlal_s16(q9s32, d22s16, d22s16); |
| q10s32 = vmlal_s16(q10s32, d23s16, d23s16); |
| |
| d24s16 = vreinterpret_s16_u16(vget_low_u16(q12u16)); |
| d25s16 = vreinterpret_s16_u16(vget_high_u16(q12u16)); |
| q8s32 = vpadalq_s16(q8s32, vreinterpretq_s16_u16(q12u16)); |
| q9s32 = vmlal_s16(q9s32, d24s16, d24s16); |
| q10s32 = vmlal_s16(q10s32, d25s16, d25s16); |
| } |
| |
| q10s32 = vaddq_s32(q10s32, q9s32); |
| q0s64 = vpaddlq_s32(q8s32); |
| q1s64 = vpaddlq_s32(q10s32); |
| |
| d0s64 = vadd_s64(vget_low_s64(q0s64), vget_high_s64(q0s64)); |
| d1s64 = vadd_s64(vget_low_s64(q1s64), vget_high_s64(q1s64)); |
| |
| q5s64 = vmull_s32(vreinterpret_s32_s64(d0s64), vreinterpret_s32_s64(d0s64)); |
| vst1_lane_u32((uint32_t *)sse, vreinterpret_u32_s64(d1s64), 0); |
| |
| d10u32 = vshr_n_u32(vreinterpret_u32_s64(vget_low_s64(q5s64)), 7); |
| d0u32 = vsub_u32(vreinterpret_u32_s64(d1s64), d10u32); |
| |
| return vget_lane_u32(d0u32, 0); |
| } |
| |
| unsigned int aom_mse16x16_neon(const unsigned char *src_ptr, int source_stride, |
| const unsigned char *ref_ptr, int recon_stride, |
| unsigned int *sse) { |
| int i; |
| int16x4_t d22s16, d23s16, d24s16, d25s16, d26s16, d27s16, d28s16, d29s16; |
| int64x1_t d0s64; |
| uint8x16_t q0u8, q1u8, q2u8, q3u8; |
| int32x4_t q7s32, q8s32, q9s32, q10s32; |
| uint16x8_t q11u16, q12u16, q13u16, q14u16; |
| int64x2_t q1s64; |
| |
| q7s32 = vdupq_n_s32(0); |
| q8s32 = vdupq_n_s32(0); |
| q9s32 = vdupq_n_s32(0); |
| q10s32 = vdupq_n_s32(0); |
| |
| for (i = 0; i < 8; i++) { // mse16x16_neon_loop |
| q0u8 = vld1q_u8(src_ptr); |
| src_ptr += source_stride; |
| q1u8 = vld1q_u8(src_ptr); |
| src_ptr += source_stride; |
| q2u8 = vld1q_u8(ref_ptr); |
| ref_ptr += recon_stride; |
| q3u8 = vld1q_u8(ref_ptr); |
| ref_ptr += recon_stride; |
| |
| q11u16 = vsubl_u8(vget_low_u8(q0u8), vget_low_u8(q2u8)); |
| q12u16 = vsubl_u8(vget_high_u8(q0u8), vget_high_u8(q2u8)); |
| q13u16 = vsubl_u8(vget_low_u8(q1u8), vget_low_u8(q3u8)); |
| q14u16 = vsubl_u8(vget_high_u8(q1u8), vget_high_u8(q3u8)); |
| |
| d22s16 = vreinterpret_s16_u16(vget_low_u16(q11u16)); |
| d23s16 = vreinterpret_s16_u16(vget_high_u16(q11u16)); |
| q7s32 = vmlal_s16(q7s32, d22s16, d22s16); |
| q8s32 = vmlal_s16(q8s32, d23s16, d23s16); |
| |
| d24s16 = vreinterpret_s16_u16(vget_low_u16(q12u16)); |
| d25s16 = vreinterpret_s16_u16(vget_high_u16(q12u16)); |
| q9s32 = vmlal_s16(q9s32, d24s16, d24s16); |
| q10s32 = vmlal_s16(q10s32, d25s16, d25s16); |
| |
| d26s16 = vreinterpret_s16_u16(vget_low_u16(q13u16)); |
| d27s16 = vreinterpret_s16_u16(vget_high_u16(q13u16)); |
| q7s32 = vmlal_s16(q7s32, d26s16, d26s16); |
| q8s32 = vmlal_s16(q8s32, d27s16, d27s16); |
| |
| d28s16 = vreinterpret_s16_u16(vget_low_u16(q14u16)); |
| d29s16 = vreinterpret_s16_u16(vget_high_u16(q14u16)); |
| q9s32 = vmlal_s16(q9s32, d28s16, d28s16); |
| q10s32 = vmlal_s16(q10s32, d29s16, d29s16); |
| } |
| |
| q7s32 = vaddq_s32(q7s32, q8s32); |
| q9s32 = vaddq_s32(q9s32, q10s32); |
| q10s32 = vaddq_s32(q7s32, q9s32); |
| |
| q1s64 = vpaddlq_s32(q10s32); |
| d0s64 = vadd_s64(vget_low_s64(q1s64), vget_high_s64(q1s64)); |
| |
| vst1_lane_u32((uint32_t *)sse, vreinterpret_u32_s64(d0s64), 0); |
| return vget_lane_u32(vreinterpret_u32_s64(d0s64), 0); |
| } |
| |
| unsigned int aom_get4x4sse_cs_neon(const unsigned char *src_ptr, |
| int source_stride, |
| const unsigned char *ref_ptr, |
| int recon_stride) { |
| int16x4_t d22s16, d24s16, d26s16, d28s16; |
| int64x1_t d0s64; |
| uint8x8_t d0u8, d1u8, d2u8, d3u8, d4u8, d5u8, d6u8, d7u8; |
| int32x4_t q7s32, q8s32, q9s32, q10s32; |
| uint16x8_t q11u16, q12u16, q13u16, q14u16; |
| int64x2_t q1s64; |
| |
| d0u8 = vld1_u8(src_ptr); |
| src_ptr += source_stride; |
| d4u8 = vld1_u8(ref_ptr); |
| ref_ptr += recon_stride; |
| d1u8 = vld1_u8(src_ptr); |
| src_ptr += source_stride; |
| d5u8 = vld1_u8(ref_ptr); |
| ref_ptr += recon_stride; |
| d2u8 = vld1_u8(src_ptr); |
| src_ptr += source_stride; |
| d6u8 = vld1_u8(ref_ptr); |
| ref_ptr += recon_stride; |
| d3u8 = vld1_u8(src_ptr); |
| d7u8 = vld1_u8(ref_ptr); |
| |
| q11u16 = vsubl_u8(d0u8, d4u8); |
| q12u16 = vsubl_u8(d1u8, d5u8); |
| q13u16 = vsubl_u8(d2u8, d6u8); |
| q14u16 = vsubl_u8(d3u8, d7u8); |
| |
| d22s16 = vget_low_s16(vreinterpretq_s16_u16(q11u16)); |
| d24s16 = vget_low_s16(vreinterpretq_s16_u16(q12u16)); |
| d26s16 = vget_low_s16(vreinterpretq_s16_u16(q13u16)); |
| d28s16 = vget_low_s16(vreinterpretq_s16_u16(q14u16)); |
| |
| q7s32 = vmull_s16(d22s16, d22s16); |
| q8s32 = vmull_s16(d24s16, d24s16); |
| q9s32 = vmull_s16(d26s16, d26s16); |
| q10s32 = vmull_s16(d28s16, d28s16); |
| |
| q7s32 = vaddq_s32(q7s32, q8s32); |
| q9s32 = vaddq_s32(q9s32, q10s32); |
| q9s32 = vaddq_s32(q7s32, q9s32); |
| |
| q1s64 = vpaddlq_s32(q9s32); |
| d0s64 = vadd_s64(vget_low_s64(q1s64), vget_high_s64(q1s64)); |
| |
| return vget_lane_u32(vreinterpret_u32_s64(d0s64), 0); |
| } |
| |
| // Load 4 sets of 4 bytes when alignment is not guaranteed. |
| static INLINE uint8x16_t load_unaligned_u8q(const uint8_t *buf, int stride) { |
| uint32_t a; |
| uint32x4_t a_u32 = vdupq_n_u32(0); |
| if (stride == 4) return vld1q_u8(buf); |
| memcpy(&a, buf, 4); |
| buf += stride; |
| a_u32 = vld1q_lane_u32(&a, a_u32, 0); |
| memcpy(&a, buf, 4); |
| buf += stride; |
| a_u32 = vld1q_lane_u32(&a, a_u32, 1); |
| memcpy(&a, buf, 4); |
| buf += stride; |
| a_u32 = vld1q_lane_u32(&a, a_u32, 2); |
| memcpy(&a, buf, 4); |
| buf += stride; |
| a_u32 = vld1q_lane_u32(&a, a_u32, 3); |
| return vreinterpretq_u8_u32(a_u32); |
| } |
| |
| // The variance helper functions use int16_t for sum. 8 values are accumulated |
| // and then added (at which point they expand up to int32_t). To avoid overflow, |
| // there can be no more than 32767 / 255 ~= 128 values accumulated in each |
| // column. For a 32x32 buffer, this results in 32 / 8 = 4 values per row * 32 |
| // rows = 128. Asserts have been added to each function to warn against reaching |
| // this limit. |
| |
| // Process a block of width 4 four rows at a time. |
| static void variance_neon_w4x4(const uint8_t *a, int a_stride, const uint8_t *b, |
| int b_stride, int h, uint32_t *sse, int *sum) { |
| const int32x4_t zero = vdupq_n_s32(0); |
| int16x8_t sum_s16 = vreinterpretq_s16_s32(zero); |
| int32x4_t sse_s32 = zero; |
| |
| // Since width is only 4, sum_s16 only loads a half row per loop. |
| assert(h <= 256); |
| |
| int i; |
| for (i = 0; i < h; i += 4) { |
| const uint8x16_t a_u8 = load_unaligned_u8q(a, a_stride); |
| const uint8x16_t b_u8 = load_unaligned_u8q(b, b_stride); |
| const int16x8_t diff_lo_s16 = |
| vreinterpretq_s16_u16(vsubl_u8(vget_low_u8(a_u8), vget_low_u8(b_u8))); |
| const int16x8_t diff_hi_s16 = |
| vreinterpretq_s16_u16(vsubl_u8(vget_high_u8(a_u8), vget_high_u8(b_u8))); |
| |
| sum_s16 = vaddq_s16(sum_s16, diff_lo_s16); |
| sum_s16 = vaddq_s16(sum_s16, diff_hi_s16); |
| |
| sse_s32 = vmlal_s16(sse_s32, vget_low_s16(diff_lo_s16), |
| vget_low_s16(diff_lo_s16)); |
| sse_s32 = vmlal_s16(sse_s32, vget_high_s16(diff_lo_s16), |
| vget_high_s16(diff_lo_s16)); |
| |
| sse_s32 = vmlal_s16(sse_s32, vget_low_s16(diff_hi_s16), |
| vget_low_s16(diff_hi_s16)); |
| sse_s32 = vmlal_s16(sse_s32, vget_high_s16(diff_hi_s16), |
| vget_high_s16(diff_hi_s16)); |
| |
| a += 4 * a_stride; |
| b += 4 * b_stride; |
| } |
| |
| #if defined(__aarch64__) |
| *sum = vaddvq_s32(vpaddlq_s16(sum_s16)); |
| *sse = (uint32_t)vaddvq_s32(sse_s32); |
| #else |
| *sum = horizontal_add_s16x8(sum_s16); |
| *sse = (uint32_t)horizontal_add_s32x4(sse_s32); |
| #endif |
| } |
| |
| // Process a block of any size where the width is divisible by 16. |
| static void variance_neon_w16(const uint8_t *a, int a_stride, const uint8_t *b, |
| int b_stride, int w, int h, uint32_t *sse, |
| int *sum) { |
| const int32x4_t zero = vdupq_n_s32(0); |
| int16x8_t sum_s16 = vreinterpretq_s16_s32(zero); |
| int32x4_t sse_s32 = zero; |
| |
| // The loop loads 16 values at a time but doubles them up when accumulating |
| // into sum_s16. |
| assert(w / 8 * h <= 128); |
| |
| int i, j; |
| for (i = 0; i < h; ++i) { |
| for (j = 0; j < w; j += 16) { |
| const uint8x16_t a_u8 = vld1q_u8(a + j); |
| const uint8x16_t b_u8 = vld1q_u8(b + j); |
| |
| const int16x8_t diff_lo_s16 = |
| vreinterpretq_s16_u16(vsubl_u8(vget_low_u8(a_u8), vget_low_u8(b_u8))); |
| const int16x8_t diff_hi_s16 = vreinterpretq_s16_u16( |
| vsubl_u8(vget_high_u8(a_u8), vget_high_u8(b_u8))); |
| |
| sum_s16 = vaddq_s16(sum_s16, diff_lo_s16); |
| sum_s16 = vaddq_s16(sum_s16, diff_hi_s16); |
| |
| sse_s32 = vmlal_s16(sse_s32, vget_low_s16(diff_lo_s16), |
| vget_low_s16(diff_lo_s16)); |
| sse_s32 = vmlal_s16(sse_s32, vget_high_s16(diff_lo_s16), |
| vget_high_s16(diff_lo_s16)); |
| |
| sse_s32 = vmlal_s16(sse_s32, vget_low_s16(diff_hi_s16), |
| vget_low_s16(diff_hi_s16)); |
| sse_s32 = vmlal_s16(sse_s32, vget_high_s16(diff_hi_s16), |
| vget_high_s16(diff_hi_s16)); |
| } |
| a += a_stride; |
| b += b_stride; |
| } |
| |
| #if defined(__aarch64__) |
| *sum = vaddvq_s32(vpaddlq_s16(sum_s16)); |
| *sse = (uint32_t)vaddvq_s32(sse_s32); |
| #else |
| *sum = horizontal_add_s16x8(sum_s16); |
| *sse = (uint32_t)horizontal_add_s32x4(sse_s32); |
| #endif |
| } |
| |
| // Process a block of width 8 two rows at a time. |
| static void variance_neon_w8x2(const uint8_t *a, int a_stride, const uint8_t *b, |
| int b_stride, int h, uint32_t *sse, int *sum) { |
| const int32x4_t zero = vdupq_n_s32(0); |
| int16x8_t sum_s16 = vreinterpretq_s16_s32(zero); |
| int32x4_t sse_s32 = zero; |
| |
| // Each column has it's own accumulator entry in sum_s16. |
| assert(h <= 128); |
| |
| int i = 0; |
| do { |
| const uint8x8_t a_0_u8 = vld1_u8(a); |
| const uint8x8_t a_1_u8 = vld1_u8(a + a_stride); |
| const uint8x8_t b_0_u8 = vld1_u8(b); |
| const uint8x8_t b_1_u8 = vld1_u8(b + b_stride); |
| const int16x8_t diff_0_s16 = |
| vreinterpretq_s16_u16(vsubl_u8(a_0_u8, b_0_u8)); |
| const int16x8_t diff_1_s16 = |
| vreinterpretq_s16_u16(vsubl_u8(a_1_u8, b_1_u8)); |
| sum_s16 = vaddq_s16(sum_s16, diff_0_s16); |
| sum_s16 = vaddq_s16(sum_s16, diff_1_s16); |
| sse_s32 = |
| vmlal_s16(sse_s32, vget_low_s16(diff_0_s16), vget_low_s16(diff_0_s16)); |
| sse_s32 = |
| vmlal_s16(sse_s32, vget_low_s16(diff_1_s16), vget_low_s16(diff_1_s16)); |
| sse_s32 = vmlal_s16(sse_s32, vget_high_s16(diff_0_s16), |
| vget_high_s16(diff_0_s16)); |
| sse_s32 = vmlal_s16(sse_s32, vget_high_s16(diff_1_s16), |
| vget_high_s16(diff_1_s16)); |
| a += a_stride + a_stride; |
| b += b_stride + b_stride; |
| i += 2; |
| } while (i < h); |
| |
| #if defined(__aarch64__) |
| *sum = vaddvq_s32(vpaddlq_s16(sum_s16)); |
| *sse = (uint32_t)vaddvq_s32(sse_s32); |
| #else |
| *sum = horizontal_add_s16x8(sum_s16); |
| *sse = (uint32_t)horizontal_add_s32x4(sse_s32); |
| #endif |
| } |
| |
| #define varianceNxM(n, m, shift) \ |
| unsigned int aom_variance##n##x##m##_neon(const uint8_t *a, int a_stride, \ |
| const uint8_t *b, int b_stride, \ |
| unsigned int *sse) { \ |
| int sum; \ |
| if (n == 4) \ |
| variance_neon_w4x4(a, a_stride, b, b_stride, m, sse, &sum); \ |
| else if (n == 8) \ |
| variance_neon_w8x2(a, a_stride, b, b_stride, m, sse, &sum); \ |
| else \ |
| variance_neon_w16(a, a_stride, b, b_stride, n, m, sse, &sum); \ |
| if (n * m < 16 * 16) \ |
| return *sse - ((sum * sum) >> shift); \ |
| else \ |
| return *sse - (uint32_t)(((int64_t)sum * sum) >> shift); \ |
| } |
| |
| static void variance_neon_wide_block(const uint8_t *a, int a_stride, |
| const uint8_t *b, int b_stride, int w, |
| int h, uint32_t *sse, int *sum) { |
| const int32x4_t zero = vdupq_n_s32(0); |
| int32x4_t v_diff = zero; |
| int64x2_t v_sse = vreinterpretq_s64_s32(zero); |
| |
| int s, i, j; |
| for (s = 0; s < 16; s++) { |
| int32x4_t sse_s32 = zero; |
| int16x8_t sum_s16 = vreinterpretq_s16_s32(zero); |
| for (i = (s * h) >> 4; i < (((s + 1) * h) >> 4); ++i) { |
| for (j = 0; j < w; j += 16) { |
| const uint8x16_t a_u8 = vld1q_u8(a + j); |
| const uint8x16_t b_u8 = vld1q_u8(b + j); |
| |
| const int16x8_t diff_lo_s16 = vreinterpretq_s16_u16( |
| vsubl_u8(vget_low_u8(a_u8), vget_low_u8(b_u8))); |
| const int16x8_t diff_hi_s16 = vreinterpretq_s16_u16( |
| vsubl_u8(vget_high_u8(a_u8), vget_high_u8(b_u8))); |
| |
| sum_s16 = vaddq_s16(sum_s16, diff_lo_s16); |
| sum_s16 = vaddq_s16(sum_s16, diff_hi_s16); |
| |
| sse_s32 = vmlal_s16(sse_s32, vget_low_s16(diff_lo_s16), |
| vget_low_s16(diff_lo_s16)); |
| sse_s32 = vmlal_s16(sse_s32, vget_high_s16(diff_lo_s16), |
| vget_high_s16(diff_lo_s16)); |
| sse_s32 = vmlal_s16(sse_s32, vget_low_s16(diff_hi_s16), |
| vget_low_s16(diff_hi_s16)); |
| sse_s32 = vmlal_s16(sse_s32, vget_high_s16(diff_hi_s16), |
| vget_high_s16(diff_hi_s16)); |
| } |
| |
| a += a_stride; |
| b += b_stride; |
| } |
| |
| v_diff = vpadalq_s16(v_diff, sum_s16); |
| v_sse = vpadalq_s32(v_sse, sse_s32); |
| } |
| #if defined(__aarch64__) |
| int diff = vaddvq_s32(v_diff); |
| uint32_t sq = (uint32_t)vaddvq_u64(vreinterpretq_u64_s64(v_sse)); |
| #else |
| int diff = horizontal_add_s32x4(v_diff); |
| uint32_t sq = vget_lane_u32( |
| vreinterpret_u32_s64(vadd_s64(vget_low_s64(v_sse), vget_high_s64(v_sse))), |
| 0); |
| #endif |
| |
| *sum = diff; |
| *sse = sq; |
| } |
| |
| #define varianceNxM_wide(W, H) \ |
| unsigned int aom_variance##W##x##H##_neon(const uint8_t *a, int a_stride, \ |
| const uint8_t *b, int b_stride, \ |
| uint32_t *sse) { \ |
| int sum; \ |
| variance_neon_wide_block(a, a_stride, b, b_stride, W, H, sse, &sum); \ |
| return *sse - (uint32_t)(((int64_t)sum * sum) / (W * H)); \ |
| } |
| |
| varianceNxM(4, 4, 4); |
| varianceNxM(4, 8, 5); |
| varianceNxM(8, 4, 5); |
| varianceNxM(16, 32, 9); |
| varianceNxM(32, 16, 9); |
| varianceNxM_wide(128, 64); |
| varianceNxM_wide(64, 128); |
