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Diffstat (limited to '')
-rw-r--r-- | third_party/aom/aom_dsp/arm/obmc_variance_neon.c | 290 |
1 files changed, 290 insertions, 0 deletions
diff --git a/third_party/aom/aom_dsp/arm/obmc_variance_neon.c b/third_party/aom/aom_dsp/arm/obmc_variance_neon.c new file mode 100644 index 0000000000..50cd5f3b6a --- /dev/null +++ b/third_party/aom/aom_dsp/arm/obmc_variance_neon.c @@ -0,0 +1,290 @@ +/* + * 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/aom_dsp_rtcd.h" +#include "mem_neon.h" +#include "sum_neon.h" + +static INLINE void obmc_variance_8x1_s16_neon(int16x8_t pre_s16, + const int32_t *wsrc, + const int32_t *mask, + int32x4_t *ssev, + int32x4_t *sumv) { + // For 4xh and 8xh we observe it is faster to avoid the double-widening of + // pre. Instead we do a single widening step and narrow the mask to 16-bits + // to allow us to perform a widening multiply. Widening multiply + // instructions have better throughput on some micro-architectures but for + // the larger block sizes this benefit is outweighed by the additional + // instruction needed to first narrow the mask vectors. + + int32x4_t wsrc_s32_lo = vld1q_s32(&wsrc[0]); + int32x4_t wsrc_s32_hi = vld1q_s32(&wsrc[4]); + int16x8_t mask_s16 = vuzpq_s16(vreinterpretq_s16_s32(vld1q_s32(&mask[0])), + vreinterpretq_s16_s32(vld1q_s32(&mask[4]))) + .val[0]; + + int32x4_t diff_s32_lo = + vmlsl_s16(wsrc_s32_lo, vget_low_s16(pre_s16), vget_low_s16(mask_s16)); + int32x4_t diff_s32_hi = + vmlsl_s16(wsrc_s32_hi, vget_high_s16(pre_s16), vget_high_s16(mask_s16)); + + // ROUND_POWER_OF_TWO_SIGNED(value, 12) rounds to nearest with ties away + // from zero, however vrshrq_n_s32 rounds to nearest with ties rounded up. + // This difference only affects the bit patterns at the rounding breakpoints + // exactly, so we can add -1 to all negative numbers to move the breakpoint + // one value across and into the correct rounding region. + diff_s32_lo = vsraq_n_s32(diff_s32_lo, diff_s32_lo, 31); + diff_s32_hi = vsraq_n_s32(diff_s32_hi, diff_s32_hi, 31); + int32x4_t round_s32_lo = vrshrq_n_s32(diff_s32_lo, 12); + int32x4_t round_s32_hi = vrshrq_n_s32(diff_s32_hi, 12); + + *sumv = vrsraq_n_s32(*sumv, diff_s32_lo, 12); + *sumv = vrsraq_n_s32(*sumv, diff_s32_hi, 12); + *ssev = vmlaq_s32(*ssev, round_s32_lo, round_s32_lo); + *ssev = vmlaq_s32(*ssev, round_s32_hi, round_s32_hi); +} + +#if AOM_ARCH_AARCH64 + +// Use tbl for doing a double-width zero extension from 8->32 bits since we can +// do this in one instruction rather than two (indices out of range (255 here) +// are set to zero by tbl). +DECLARE_ALIGNED(16, static const uint8_t, obmc_variance_permute_idx[]) = { + 0, 255, 255, 255, 1, 255, 255, 255, 2, 255, 255, 255, 3, 255, 255, 255, + 4, 255, 255, 255, 5, 255, 255, 255, 6, 255, 255, 255, 7, 255, 255, 255, + 8, 255, 255, 255, 9, 255, 255, 255, 10, 255, 255, 255, 11, 255, 255, 255, + 12, 255, 255, 255, 13, 255, 255, 255, 14, 255, 255, 255, 15, 255, 255, 255 +}; + +static INLINE void obmc_variance_8x1_s32_neon( + int32x4_t pre_lo, int32x4_t pre_hi, const int32_t *wsrc, + const int32_t *mask, int32x4_t *ssev, int32x4_t *sumv) { + int32x4_t wsrc_lo = vld1q_s32(&wsrc[0]); + int32x4_t wsrc_hi = vld1q_s32(&wsrc[4]); + int32x4_t mask_lo = vld1q_s32(&mask[0]); + int32x4_t mask_hi = vld1q_s32(&mask[4]); + + int32x4_t diff_lo = vmlsq_s32(wsrc_lo, pre_lo, mask_lo); + int32x4_t diff_hi = vmlsq_s32(wsrc_hi, pre_hi, mask_hi); + + // ROUND_POWER_OF_TWO_SIGNED(value, 12) rounds to nearest with ties away from + // zero, however vrshrq_n_s32 rounds to nearest with ties rounded up. This + // difference only affects the bit patterns at the rounding breakpoints + // exactly, so we can add -1 to all negative numbers to move the breakpoint + // one value across and into the correct rounding region. + diff_lo = vsraq_n_s32(diff_lo, diff_lo, 31); + diff_hi = vsraq_n_s32(diff_hi, diff_hi, 31); + int32x4_t round_lo = vrshrq_n_s32(diff_lo, 12); + int32x4_t round_hi = vrshrq_n_s32(diff_hi, 12); + + *sumv = vrsraq_n_s32(*sumv, diff_lo, 12); + *sumv = vrsraq_n_s32(*sumv, diff_hi, 12); + *ssev = vmlaq_s32(*ssev, round_lo, round_lo); + *ssev = vmlaq_s32(*ssev, round_hi, round_hi); +} + +static INLINE void obmc_variance_large_neon(const uint8_t *pre, int pre_stride, + const int32_t *wsrc, + const int32_t *mask, int width, + int height, unsigned *sse, + int *sum) { + assert(width % 16 == 0); + + // Use tbl for doing a double-width zero extension from 8->32 bits since we + // can do this in one instruction rather than two. + uint8x16_t pre_idx0 = vld1q_u8(&obmc_variance_permute_idx[0]); + uint8x16_t pre_idx1 = vld1q_u8(&obmc_variance_permute_idx[16]); + uint8x16_t pre_idx2 = vld1q_u8(&obmc_variance_permute_idx[32]); + uint8x16_t pre_idx3 = vld1q_u8(&obmc_variance_permute_idx[48]); + + int32x4_t ssev = vdupq_n_s32(0); + int32x4_t sumv = vdupq_n_s32(0); + + int h = height; + do { + int w = width; + do { + uint8x16_t pre_u8 = vld1q_u8(pre); + + int32x4_t pre_s32_lo = vreinterpretq_s32_u8(vqtbl1q_u8(pre_u8, pre_idx0)); + int32x4_t pre_s32_hi = vreinterpretq_s32_u8(vqtbl1q_u8(pre_u8, pre_idx1)); + obmc_variance_8x1_s32_neon(pre_s32_lo, pre_s32_hi, &wsrc[0], &mask[0], + &ssev, &sumv); + + pre_s32_lo = vreinterpretq_s32_u8(vqtbl1q_u8(pre_u8, pre_idx2)); + pre_s32_hi = vreinterpretq_s32_u8(vqtbl1q_u8(pre_u8, pre_idx3)); + obmc_variance_8x1_s32_neon(pre_s32_lo, pre_s32_hi, &wsrc[8], &mask[8], + &ssev, &sumv); + + wsrc += 16; + mask += 16; + pre += 16; + w -= 16; + } while (w != 0); + + pre += pre_stride - width; + } while (--h != 0); + + *sse = horizontal_add_s32x4(ssev); + *sum = horizontal_add_s32x4(sumv); +} + +#else // !AOM_ARCH_AARCH64 + +static INLINE void obmc_variance_large_neon(const uint8_t *pre, int pre_stride, + const int32_t *wsrc, + const int32_t *mask, int width, + int height, unsigned *sse, + int *sum) { + // Non-aarch64 targets do not have a 128-bit tbl instruction, so use the + // widening version of the core kernel instead. + + assert(width % 16 == 0); + + int32x4_t ssev = vdupq_n_s32(0); + int32x4_t sumv = vdupq_n_s32(0); + + int h = height; + do { + int w = width; + do { + uint8x16_t pre_u8 = vld1q_u8(pre); + + int16x8_t pre_s16 = vreinterpretq_s16_u16(vmovl_u8(vget_low_u8(pre_u8))); + obmc_variance_8x1_s16_neon(pre_s16, &wsrc[0], &mask[0], &ssev, &sumv); + + pre_s16 = vreinterpretq_s16_u16(vmovl_u8(vget_high_u8(pre_u8))); + obmc_variance_8x1_s16_neon(pre_s16, &wsrc[8], &mask[8], &ssev, &sumv); + + wsrc += 16; + mask += 16; + pre += 16; + w -= 16; + } while (w != 0); + + pre += pre_stride - width; + } while (--h != 0); + + *sse = horizontal_add_s32x4(ssev); + *sum = horizontal_add_s32x4(sumv); +} + +#endif // AOM_ARCH_AARCH64 + +static INLINE void obmc_variance_neon_128xh(const uint8_t *pre, int pre_stride, + const int32_t *wsrc, + const int32_t *mask, int h, + unsigned *sse, int *sum) { + obmc_variance_large_neon(pre, pre_stride, wsrc, mask, 128, h, sse, sum); +} + +static INLINE void obmc_variance_neon_64xh(const uint8_t *pre, int pre_stride, + const int32_t *wsrc, + const int32_t *mask, int h, + unsigned *sse, int *sum) { + obmc_variance_large_neon(pre, pre_stride, wsrc, mask, 64, h, sse, sum); +} + +static INLINE void obmc_variance_neon_32xh(const uint8_t *pre, int pre_stride, + const int32_t *wsrc, + const int32_t *mask, int h, + unsigned *sse, int *sum) { + obmc_variance_large_neon(pre, pre_stride, wsrc, mask, 32, h, sse, sum); +} + +static INLINE void obmc_variance_neon_16xh(const uint8_t *pre, int pre_stride, + const int32_t *wsrc, + const int32_t *mask, int h, + unsigned *sse, int *sum) { + obmc_variance_large_neon(pre, pre_stride, wsrc, mask, 16, h, sse, sum); +} + +static INLINE void obmc_variance_neon_8xh(const uint8_t *pre, int pre_stride, + const int32_t *wsrc, + const int32_t *mask, int h, + unsigned *sse, int *sum) { + int32x4_t ssev = vdupq_n_s32(0); + int32x4_t sumv = vdupq_n_s32(0); + + do { + uint8x8_t pre_u8 = vld1_u8(pre); + int16x8_t pre_s16 = vreinterpretq_s16_u16(vmovl_u8(pre_u8)); + + obmc_variance_8x1_s16_neon(pre_s16, wsrc, mask, &ssev, &sumv); + + pre += pre_stride; + wsrc += 8; + mask += 8; + } while (--h != 0); + + *sse = horizontal_add_s32x4(ssev); + *sum = horizontal_add_s32x4(sumv); +} + +static INLINE void obmc_variance_neon_4xh(const uint8_t *pre, int pre_stride, + const int32_t *wsrc, + const int32_t *mask, int h, + unsigned *sse, int *sum) { + assert(h % 2 == 0); + + int32x4_t ssev = vdupq_n_s32(0); + int32x4_t sumv = vdupq_n_s32(0); + + do { + uint8x8_t pre_u8 = load_unaligned_u8(pre, pre_stride); + int16x8_t pre_s16 = vreinterpretq_s16_u16(vmovl_u8(pre_u8)); + + obmc_variance_8x1_s16_neon(pre_s16, wsrc, mask, &ssev, &sumv); + + pre += 2 * pre_stride; + wsrc += 8; + mask += 8; + h -= 2; + } while (h != 0); + + *sse = horizontal_add_s32x4(ssev); + *sum = horizontal_add_s32x4(sumv); +} + +#define OBMC_VARIANCE_WXH_NEON(W, H) \ + unsigned aom_obmc_variance##W##x##H##_neon( \ + const uint8_t *pre, int pre_stride, const int32_t *wsrc, \ + const int32_t *mask, unsigned *sse) { \ + int sum; \ + obmc_variance_neon_##W##xh(pre, pre_stride, wsrc, mask, H, sse, &sum); \ + return *sse - (unsigned)(((int64_t)sum * sum) / (W * H)); \ + } + +OBMC_VARIANCE_WXH_NEON(4, 4) +OBMC_VARIANCE_WXH_NEON(4, 8) +OBMC_VARIANCE_WXH_NEON(8, 4) +OBMC_VARIANCE_WXH_NEON(8, 8) +OBMC_VARIANCE_WXH_NEON(8, 16) +OBMC_VARIANCE_WXH_NEON(16, 8) +OBMC_VARIANCE_WXH_NEON(16, 16) +OBMC_VARIANCE_WXH_NEON(16, 32) +OBMC_VARIANCE_WXH_NEON(32, 16) +OBMC_VARIANCE_WXH_NEON(32, 32) +OBMC_VARIANCE_WXH_NEON(32, 64) +OBMC_VARIANCE_WXH_NEON(64, 32) +OBMC_VARIANCE_WXH_NEON(64, 64) +OBMC_VARIANCE_WXH_NEON(64, 128) +OBMC_VARIANCE_WXH_NEON(128, 64) +OBMC_VARIANCE_WXH_NEON(128, 128) +OBMC_VARIANCE_WXH_NEON(4, 16) +OBMC_VARIANCE_WXH_NEON(16, 4) +OBMC_VARIANCE_WXH_NEON(8, 32) +OBMC_VARIANCE_WXH_NEON(32, 8) +OBMC_VARIANCE_WXH_NEON(16, 64) +OBMC_VARIANCE_WXH_NEON(64, 16) |