/* * Copyright © 2019, VideoLAN and dav1d authors * Copyright © 2019, Michail Alvanos * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions are met: * * 1. Redistributions of source code must retain the above copyright notice, this *    list of conditions and the following disclaimer. * * 2. Redistributions in binary form must reproduce the above copyright notice, *    this list of conditions and the following disclaimer in the documentation *    and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ #include "common/intops.h"#include "src/ppc/types.h"#include "src/cpu.h"#include "src/looprestoration.h" #if BITDEPTH == 8 #define REST_UNIT_STRIDE (400) static inline i32x4 iclip_vec(i32x4 v, const i32x4 minv, const i32x4 maxv) {    v = vec_max(minv, v);    v = vec_min(maxv, v);    return v;} #define APPLY_FILTER_H(v, f, ssum1, ssum2) do {  \    i16x8 ktmp_u16_high = (i16x8) u8h_to_u16(v); \    i16x8 ktmp_u16_low  = (i16x8) u8l_to_u16(v); \    ssum1 = vec_madd(ktmp_u16_high, f, ssum1);   \    ssum2 = vec_madd(ktmp_u16_low, f, ssum2);    \} while (0) static void wiener_filter_h_vsx(int32_t *hor_ptr,                                uint8_t *tmp_ptr,                                const int16_t filterh[8],                                const int w, const int h){    static const i32x4 zerov = vec_splats(0);    static const i32x4 seven_vec = vec_splats(7);    static const i32x4 bitdepth_added_vec = vec_splats(1 << 14);    static const i32x4 round_bits_vec = vec_splats(3);    static const i32x4 rounding_off_vec = vec_splats(1<<2);    static const i32x4 clip_limit_v = vec_splats((1 << 13) - 1);     i16x8 filterhvall = vec_vsx_ld(0, filterh);    i16x8 filterhv0 =  vec_splat( filterhvall, 0);    i16x8 filterhv1 =  vec_splat( filterhvall, 1);    i16x8 filterhv2 =  vec_splat( filterhvall, 2);    i16x8 filterhv3 =  vec_splat( filterhvall, 3);    i16x8 filterhv4 =  vec_splat( filterhvall, 4);    i16x8 filterhv5 =  vec_splat( filterhvall, 5);    i16x8 filterhv6 =  vec_splat( filterhvall, 6);     for (int j = 0; j < h + 6; j++) {        for (int i = 0; i < w; i+=16) {            i32x4 sum1 = bitdepth_added_vec;            i32x4 sum2 = bitdepth_added_vec;            i32x4 sum3 = bitdepth_added_vec;            i32x4 sum4 = bitdepth_added_vec;             u8x16 tmp_v0 = vec_ld(0, &tmp_ptr[i]);            u8x16 tmp_v7 = vec_ld(0, &tmp_ptr[i+16]);             u8x16 tmp_v1 = vec_sld( tmp_v7, tmp_v0, 15);            u8x16 tmp_v2 = vec_sld( tmp_v7, tmp_v0, 14);            u8x16 tmp_v3 = vec_sld( tmp_v7, tmp_v0, 13);            u8x16 tmp_v4 = vec_sld( tmp_v7, tmp_v0, 12);            u8x16 tmp_v5 = vec_sld( tmp_v7, tmp_v0, 11);            u8x16 tmp_v6 = vec_sld( tmp_v7, tmp_v0, 10);             u16x8 tmp_u16_high = u8h_to_u16(tmp_v3);            u16x8 tmp_u16_low  = u8l_to_u16(tmp_v3);             i32x4 tmp_expanded1 = i16h_to_i32(tmp_u16_high);            i32x4 tmp_expanded2 = i16l_to_i32(tmp_u16_high);            i32x4 tmp_expanded3 = i16h_to_i32(tmp_u16_low);            i32x4 tmp_expanded4 = i16l_to_i32(tmp_u16_low);             i16x8 ssum1 = (i16x8) zerov;            i16x8 ssum2 = (i16x8) zerov;             APPLY_FILTER_H(tmp_v0, filterhv0, ssum1, ssum2);            APPLY_FILTER_H(tmp_v1, filterhv1, ssum1, ssum2);            APPLY_FILTER_H(tmp_v2, filterhv2, ssum1, ssum2);            APPLY_FILTER_H(tmp_v3, filterhv3, ssum1, ssum2);            APPLY_FILTER_H(tmp_v4, filterhv4, ssum1, ssum2);            APPLY_FILTER_H(tmp_v5, filterhv5, ssum1, ssum2);            APPLY_FILTER_H(tmp_v6, filterhv6, ssum1, ssum2);             sum1 += i16h_to_i32(ssum1) + (tmp_expanded1 << seven_vec);            sum2 += i16l_to_i32(ssum1) + (tmp_expanded2 << seven_vec);            sum3 += i16h_to_i32(ssum2) + (tmp_expanded3 << seven_vec);            sum4 += i16l_to_i32(ssum2) + (tmp_expanded4 << seven_vec);             sum1 = (sum1 + rounding_off_vec) >> round_bits_vec;            sum2 = (sum2 + rounding_off_vec) >> round_bits_vec;            sum3 = (sum3 + rounding_off_vec) >> round_bits_vec;            sum4 = (sum4 + rounding_off_vec) >> round_bits_vec;             sum1 = iclip_vec(sum1, zerov, clip_limit_v);            sum2 = iclip_vec(sum2, zerov, clip_limit_v);            sum3 = iclip_vec(sum3, zerov, clip_limit_v);            sum4 = iclip_vec(sum4, zerov, clip_limit_v);             vec_st(sum1,  0, &hor_ptr[i]);            vec_st(sum2, 16, &hor_ptr[i]);            vec_st(sum3, 32, &hor_ptr[i]);            vec_st(sum4, 48, &hor_ptr[i]);        }        tmp_ptr += REST_UNIT_STRIDE;        hor_ptr += REST_UNIT_STRIDE;    }} static inline i16x8 iclip_u8_vec(i16x8 v) {    static const i16x8 zerov = vec_splats((int16_t)0);    static const i16x8 maxv = vec_splats((int16_t)255);    v = vec_max(zerov, v);    v = vec_min(maxv, v);    return v;} #define APPLY_FILTER_V(index, f) do { \    i32x4 v1 = vec_ld( 0, &hor[(j + index) * REST_UNIT_STRIDE + i]); \    i32x4 v2 = vec_ld(16, &hor[(j + index) * REST_UNIT_STRIDE + i]); \    i32x4 v3 = vec_ld(32, &hor[(j + index) * REST_UNIT_STRIDE + i]); \    i32x4 v4 = vec_ld(48, &hor[(j + index) * REST_UNIT_STRIDE + i]); \    sum1 = sum1 + v1 * f; \    sum2 = sum2 + v2 * f; \    sum3 = sum3 + v3 * f; \    sum4 = sum4 + v4 * f; \} while (0) #define LOAD_AND_APPLY_FILTER_V(sumpixelv, hor) do { \    i32x4 sum1 = round_vec; \    i32x4 sum2 = round_vec; \    i32x4 sum3 = round_vec; \    i32x4 sum4 = round_vec; \    APPLY_FILTER_V(0, filterv0); \    APPLY_FILTER_V(1, filterv1); \    APPLY_FILTER_V(2, filterv2); \    APPLY_FILTER_V(3, filterv3); \    APPLY_FILTER_V(4, filterv4); \    APPLY_FILTER_V(5, filterv5); \    APPLY_FILTER_V(6, filterv6); \    sum1 = sum1 >> round_bits_vec; \    sum2 = sum2 >> round_bits_vec; \    sum3 = sum3 >> round_bits_vec; \    sum4 = sum4 >> round_bits_vec; \    i16x8 sum_short_packed_1 = (i16x8) vec_pack(sum1, sum2); \    i16x8 sum_short_packed_2 = (i16x8) vec_pack(sum3, sum4); \    sum_short_packed_1 = iclip_u8_vec(sum_short_packed_1); \    sum_short_packed_2 = iclip_u8_vec(sum_short_packed_2); \    sum_pixel = (u8x16) vec_pack(sum_short_packed_1, sum_short_packed_2); \} while (0) static inline void wiener_filter_v_vsx(uint8_t *p,                                       const ptrdiff_t p_stride,                                       const int32_t *hor,                                       const int16_t filterv[8],                                       const int w, const int h){    static const i32x4 round_bits_vec = vec_splats(11);    static const i32x4 round_vec = vec_splats((1 << 10) - (1 << 18));     i32x4 filterv0 =  vec_splats((int32_t) filterv[0]);    i32x4 filterv1 =  vec_splats((int32_t) filterv[1]);    i32x4 filterv2 =  vec_splats((int32_t) filterv[2]);    i32x4 filterv3 =  vec_splats((int32_t) filterv[3]);    i32x4 filterv4 =  vec_splats((int32_t) filterv[4]);    i32x4 filterv5 =  vec_splats((int32_t) filterv[5]);    i32x4 filterv6 =  vec_splats((int32_t) filterv[6]);     for (int j = 0; j < h; j++) {        for (int i = 0; i <(w-w%16); i += 16) {            u8x16 sum_pixel;            LOAD_AND_APPLY_FILTER_V(sum_pixel, hor);            vec_vsx_st(sum_pixel, 0, &p[j * PXSTRIDE(p_stride) + i]);        }        // remaining loop        if (w & 0xf){            int i=w-w%16;            ALIGN_STK_16(uint8_t, tmp_out, 16,);            u8x16 sum_pixel;             LOAD_AND_APPLY_FILTER_V(sum_pixel, hor);            vec_vsx_st(sum_pixel, 0, tmp_out);             for (int k=0; i<w; i++, k++) {                p[j * PXSTRIDE(p_stride) + i] = tmp_out[k];            }        }    }} static inline void padding(uint8_t *dst, const uint8_t *p,                           const ptrdiff_t p_stride, const uint8_t (*left)[4],                           const uint8_t *lpf, const ptrdiff_t lpf_stride,                           int unit_w, const int stripe_h,                           const enum LrEdgeFlags edges){    const int have_left = !!(edges & LR_HAVE_LEFT);    const int have_right = !!(edges & LR_HAVE_RIGHT);     // Copy more pixels if we don't have to pad them    unit_w += 3 * have_left + 3 * have_right;    uint8_t *dst_l = dst + 3 * !have_left;    p -= 3 * have_left;    lpf -= 3 * have_left;     if (edges & LR_HAVE_TOP) {        // Copy previous loop filtered rows        const uint8_t *const above_1 = lpf;        const uint8_t *const above_2 = above_1 + PXSTRIDE(lpf_stride);        pixel_copy(dst_l, above_1, unit_w);        pixel_copy(dst_l + REST_UNIT_STRIDE, above_1, unit_w);        pixel_copy(dst_l + 2 * REST_UNIT_STRIDE, above_2, unit_w);    } else {        // Pad with first row        pixel_copy(dst_l, p, unit_w);        pixel_copy(dst_l + REST_UNIT_STRIDE, p, unit_w);        pixel_copy(dst_l + 2 * REST_UNIT_STRIDE, p, unit_w);        if (have_left) {            pixel_copy(dst_l, &left[0][1], 3);            pixel_copy(dst_l + REST_UNIT_STRIDE, &left[0][1], 3);            pixel_copy(dst_l + 2 * REST_UNIT_STRIDE, &left[0][1], 3);        }    }     uint8_t *dst_tl = dst_l + 3 * REST_UNIT_STRIDE;    if (edges & LR_HAVE_BOTTOM) {        // Copy next loop filtered rows        const uint8_t *const below_1 = lpf + 6 * PXSTRIDE(lpf_stride);        const uint8_t *const below_2 = below_1 + PXSTRIDE(lpf_stride);        pixel_copy(dst_tl + stripe_h * REST_UNIT_STRIDE, below_1, unit_w);        pixel_copy(dst_tl + (stripe_h + 1) * REST_UNIT_STRIDE, below_2, unit_w);        pixel_copy(dst_tl + (stripe_h + 2) * REST_UNIT_STRIDE, below_2, unit_w);    } else {        // Pad with last row        const uint8_t *const src = p + (stripe_h - 1) * PXSTRIDE(p_stride);        pixel_copy(dst_tl + stripe_h * REST_UNIT_STRIDE, src, unit_w);        pixel_copy(dst_tl + (stripe_h + 1) * REST_UNIT_STRIDE, src, unit_w);        pixel_copy(dst_tl + (stripe_h + 2) * REST_UNIT_STRIDE, src, unit_w);        if (have_left) {            pixel_copy(dst_tl + stripe_h * REST_UNIT_STRIDE, &left[stripe_h - 1][1], 3);            pixel_copy(dst_tl + (stripe_h + 1) * REST_UNIT_STRIDE, &left[stripe_h - 1][1], 3);            pixel_copy(dst_tl + (stripe_h + 2) * REST_UNIT_STRIDE, &left[stripe_h - 1][1], 3);        }    }     // Inner UNIT_WxSTRIPE_H    for (int j = 0; j < stripe_h; j++) {        pixel_copy(dst_tl + 3 * have_left, p + 3 * have_left, unit_w - 3 * have_left);        dst_tl += REST_UNIT_STRIDE;        p += PXSTRIDE(p_stride);    }     if (!have_right) {        uint8_t *pad = dst_l + unit_w;        uint8_t *row_last = &dst_l[unit_w - 1];        // Pad 3x(STRIPE_H+6) with last column        for (int j = 0; j < stripe_h + 6; j++) {            pixel_set(pad, *row_last, 3);            pad += REST_UNIT_STRIDE;            row_last += REST_UNIT_STRIDE;        }    }     if (!have_left) {        // Pad 3x(STRIPE_H+6) with first column        for (int j = 0; j < stripe_h + 6; j++) {            pixel_set(dst, *dst_l, 3);            dst += REST_UNIT_STRIDE;            dst_l += REST_UNIT_STRIDE;        }    } else {        dst += 3 * REST_UNIT_STRIDE;        for (int j = 0; j < stripe_h; j++) {            pixel_copy(dst, &left[j][1], 3);            dst += REST_UNIT_STRIDE;        }    }}  // FIXME Could split into luma and chroma specific functions,// (since first and last tops are always 0 for chroma)// FIXME Could implement a version that requires less temporary memory// (should be possible to implement with only 6 rows of temp storage)static void wiener_filter_vsx(uint8_t *p, const ptrdiff_t p_stride,                              const uint8_t (*const left)[4],                              const uint8_t *lpf,                              const ptrdiff_t lpf_stride,                              const int w, const int h,                              const int16_t filter[2][8],                              const enum LrEdgeFlags edges HIGHBD_DECL_SUFFIX){    // Wiener filtering is applied to a maximum stripe height of 64 + 3 pixels    // of padding above and below    ALIGN_STK_16(uint8_t, tmp, 70 /*(64 + 3 + 3)*/ * REST_UNIT_STRIDE,);    padding(tmp, p, p_stride, left, lpf, lpf_stride, w, h, edges);    ALIGN_STK_16(int32_t, hor, 70 /*(64 + 3 + 3)*/ * REST_UNIT_STRIDE + 64,);     wiener_filter_h_vsx(hor, tmp, filter[0], w, h);    wiener_filter_v_vsx(p, p_stride, hor, filter[1], w, h); }#endif COLD void bitfn(dav1d_loop_restoration_dsp_init_ppc)    (Dav1dLoopRestorationDSPContext *const c){    const unsigned flags = dav1d_get_cpu_flags();     if (!(flags & DAV1D_PPC_CPU_FLAG_VSX)) return; #if BITDEPTH == 8    c->wiener[0] = c->wiener[1] = wiener_filter_vsx;#endif}