ref: 30c22d842cffc737de00388af972110b89b1547c
dir: /vpx_dsp/arm/variance_neon.c/
/* * Copyright (c) 2014 The WebM project authors. All Rights Reserved. * * Use of this source code is governed by a BSD-style license * that can be found in the LICENSE file in the root of the source * tree. An additional intellectual property rights grant can be found * in the file PATENTS. All contributing project authors may * be found in the AUTHORS file in the root of the source tree. */ #include <arm_neon.h> #include <assert.h> #include "./vpx_dsp_rtcd.h" #include "./vpx_config.h" #include "vpx/vpx_integer.h" #include "vpx_dsp/arm/mem_neon.h" #include "vpx_dsp/arm/sum_neon.h" #include "vpx_ports/mem.h" // 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) { int i; int16x8_t sum_s16 = vdupq_n_s16(0); int32x4_t sse_lo_s32 = vdupq_n_s32(0); int32x4_t sse_hi_s32 = vdupq_n_s32(0); // Since width is only 4, sum_s16 only loads a half row per loop. assert(h <= 256); 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 uint16x8_t diff_lo_u16 = vsubl_u8(vget_low_u8(a_u8), vget_low_u8(b_u8)); const uint16x8_t diff_hi_u16 = vsubl_u8(vget_high_u8(a_u8), vget_high_u8(b_u8)); const int16x8_t diff_lo_s16 = vreinterpretq_s16_u16(diff_lo_u16); const int16x8_t diff_hi_s16 = vreinterpretq_s16_u16(diff_hi_u16); sum_s16 = vaddq_s16(sum_s16, diff_lo_s16); sum_s16 = vaddq_s16(sum_s16, diff_hi_s16); sse_lo_s32 = vmlal_s16(sse_lo_s32, vget_low_s16(diff_lo_s16), vget_low_s16(diff_lo_s16)); sse_lo_s32 = vmlal_s16(sse_lo_s32, vget_high_s16(diff_lo_s16), vget_high_s16(diff_lo_s16)); sse_hi_s32 = vmlal_s16(sse_hi_s32, vget_low_s16(diff_hi_s16), vget_low_s16(diff_hi_s16)); sse_hi_s32 = vmlal_s16(sse_hi_s32, vget_high_s16(diff_hi_s16), vget_high_s16(diff_hi_s16)); a += 4 * a_stride; b += 4 * b_stride; } *sum = vget_lane_s32(horizontal_add_int16x8(sum_s16), 0); *sse = vget_lane_u32(horizontal_add_uint32x4(vreinterpretq_u32_s32( vaddq_s32(sse_lo_s32, sse_hi_s32))), 0); } // 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) { int i, j; int16x8_t sum_s16 = vdupq_n_s16(0); int32x4_t sse_lo_s32 = vdupq_n_s32(0); int32x4_t sse_hi_s32 = vdupq_n_s32(0); // The loop loads 16 values at a time but doubles them up when accumulating // into sum_s16. assert(w / 8 * h <= 128); 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 uint16x8_t diff_lo_u16 = vsubl_u8(vget_low_u8(a_u8), vget_low_u8(b_u8)); const uint16x8_t diff_hi_u16 = vsubl_u8(vget_high_u8(a_u8), vget_high_u8(b_u8)); const int16x8_t diff_lo_s16 = vreinterpretq_s16_u16(diff_lo_u16); const int16x8_t diff_hi_s16 = vreinterpretq_s16_u16(diff_hi_u16); sum_s16 = vaddq_s16(sum_s16, diff_lo_s16); sum_s16 = vaddq_s16(sum_s16, diff_hi_s16); sse_lo_s32 = vmlal_s16(sse_lo_s32, vget_low_s16(diff_lo_s16), vget_low_s16(diff_lo_s16)); sse_lo_s32 = vmlal_s16(sse_lo_s32, vget_high_s16(diff_lo_s16), vget_high_s16(diff_lo_s16)); sse_hi_s32 = vmlal_s16(sse_hi_s32, vget_low_s16(diff_hi_s16), vget_low_s16(diff_hi_s16)); sse_hi_s32 = vmlal_s16(sse_hi_s32, vget_high_s16(diff_hi_s16), vget_high_s16(diff_hi_s16)); } a += a_stride; b += b_stride; } *sum = vget_lane_s32(horizontal_add_int16x8(sum_s16), 0); *sse = vget_lane_u32(horizontal_add_uint32x4(vreinterpretq_u32_s32( vaddq_s32(sse_lo_s32, sse_hi_s32))), 0); } // 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) { int i = 0; int16x8_t sum_s16 = vdupq_n_s16(0); int32x4_t sse_lo_s32 = vdupq_n_s32(0); int32x4_t sse_hi_s32 = vdupq_n_s32(0); // Each column has it's own accumulator entry in sum_s16. assert(h <= 128); 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 uint16x8_t diff_0_u16 = vsubl_u8(a_0_u8, b_0_u8); const uint16x8_t diff_1_u16 = vsubl_u8(a_1_u8, b_1_u8); const int16x8_t diff_0_s16 = vreinterpretq_s16_u16(diff_0_u16); const int16x8_t diff_1_s16 = vreinterpretq_s16_u16(diff_1_u16); sum_s16 = vaddq_s16(sum_s16, diff_0_s16); sum_s16 = vaddq_s16(sum_s16, diff_1_s16); sse_lo_s32 = vmlal_s16(sse_lo_s32, vget_low_s16(diff_0_s16), vget_low_s16(diff_0_s16)); sse_lo_s32 = vmlal_s16(sse_lo_s32, vget_low_s16(diff_1_s16), vget_low_s16(diff_1_s16)); sse_hi_s32 = vmlal_s16(sse_hi_s32, vget_high_s16(diff_0_s16), vget_high_s16(diff_0_s16)); sse_hi_s32 = vmlal_s16(sse_hi_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); *sum = vget_lane_s32(horizontal_add_int16x8(sum_s16), 0); *sse = vget_lane_u32(horizontal_add_uint32x4(vreinterpretq_u32_s32( vaddq_s32(sse_lo_s32, sse_hi_s32))), 0); } void vpx_get8x8var_neon(const uint8_t *a, int a_stride, const uint8_t *b, int b_stride, unsigned int *sse, int *sum) { variance_neon_w8x2(a, a_stride, b, b_stride, 8, sse, sum); } void vpx_get16x16var_neon(const uint8_t *a, int a_stride, const uint8_t *b, int b_stride, unsigned int *sse, int *sum) { variance_neon_w16(a, a_stride, b, b_stride, 16, 16, sse, sum); } #define varianceNxM(n, m, shift) \ unsigned int vpx_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); \ } varianceNxM(4, 4, 4); varianceNxM(4, 8, 5); varianceNxM(8, 4, 5); varianceNxM(8, 8, 6); varianceNxM(8, 16, 7); varianceNxM(16, 8, 7); varianceNxM(16, 16, 8); varianceNxM(16, 32, 9); varianceNxM(32, 16, 9); varianceNxM(32, 32, 10); unsigned int vpx_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_w16(a, a_stride, b, b_stride, 32, 32, &sse1, &sum1); variance_neon_w16(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 vpx_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_w16(a, a_stride, b, b_stride, 64, 16, &sse1, &sum1); variance_neon_w16(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 vpx_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_w16(a, a_stride, b, b_stride, 64, 16, &sse1, &sum1); variance_neon_w16(a + (16 * a_stride), a_stride, b + (16 * b_stride), b_stride, 64, 16, &sse2, &sum2); sse1 += sse2; sum1 += sum2; variance_neon_w16(a + (16 * 2 * a_stride), a_stride, b + (16 * 2 * b_stride), b_stride, 64, 16, &sse2, &sum2); sse1 += sse2; sum1 += sum2; variance_neon_w16(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 vpx_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 vpx_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); src_ptr += source_stride; d7u8 = vld1_u8(ref_ptr); ref_ptr += recon_stride; 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); }