ref: e7cf9fd4446ed93ca91e18b5440f1f005a5228a9
dir: /vpx_dsp/ppc/vpx_convolve_vsx.c/
/* * Copyright (c) 2017 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 <assert.h> #include <string.h> #include "./vpx_dsp_rtcd.h" #include "vpx/vpx_integer.h" #include "vpx_dsp/ppc/types_vsx.h" #include "vpx_dsp/vpx_filter.h" // TODO(lu_zero): unroll static VPX_FORCE_INLINE void copy_w16(const uint8_t *src, ptrdiff_t src_stride, uint8_t *dst, ptrdiff_t dst_stride, int32_t h) { int i; for (i = h; i--;) { vec_vsx_st(vec_vsx_ld(0, src), 0, dst); src += src_stride; dst += dst_stride; } } static VPX_FORCE_INLINE void copy_w32(const uint8_t *src, ptrdiff_t src_stride, uint8_t *dst, ptrdiff_t dst_stride, int32_t h) { int i; for (i = h; i--;) { vec_vsx_st(vec_vsx_ld(0, src), 0, dst); vec_vsx_st(vec_vsx_ld(16, src), 16, dst); src += src_stride; dst += dst_stride; } } static VPX_FORCE_INLINE void copy_w64(const uint8_t *src, ptrdiff_t src_stride, uint8_t *dst, ptrdiff_t dst_stride, int32_t h) { int i; for (i = h; i--;) { vec_vsx_st(vec_vsx_ld(0, src), 0, dst); vec_vsx_st(vec_vsx_ld(16, src), 16, dst); vec_vsx_st(vec_vsx_ld(32, src), 32, dst); vec_vsx_st(vec_vsx_ld(48, src), 48, dst); src += src_stride; dst += dst_stride; } } void vpx_convolve_copy_vsx(const uint8_t *src, ptrdiff_t src_stride, uint8_t *dst, ptrdiff_t dst_stride, const InterpKernel *filter, int x0_q4, int x_step_q4, int y0_q4, int32_t y_step_q4, int32_t w, int32_t h) { (void)filter; (void)x0_q4; (void)x_step_q4; (void)y0_q4; (void)y_step_q4; switch (w) { case 16: { copy_w16(src, src_stride, dst, dst_stride, h); break; } case 32: { copy_w32(src, src_stride, dst, dst_stride, h); break; } case 64: { copy_w64(src, src_stride, dst, dst_stride, h); break; } default: { int i; for (i = h; i--;) { memcpy(dst, src, w); src += src_stride; dst += dst_stride; } break; } } } static VPX_FORCE_INLINE void avg_w16(const uint8_t *src, ptrdiff_t src_stride, uint8_t *dst, ptrdiff_t dst_stride, int32_t h) { int i; for (i = h; i--;) { const uint8x16_t v = vec_avg(vec_vsx_ld(0, src), vec_vsx_ld(0, dst)); vec_vsx_st(v, 0, dst); src += src_stride; dst += dst_stride; } } static VPX_FORCE_INLINE void avg_w32(const uint8_t *src, ptrdiff_t src_stride, uint8_t *dst, ptrdiff_t dst_stride, int32_t h) { int i; for (i = h; i--;) { const uint8x16_t v0 = vec_avg(vec_vsx_ld(0, src), vec_vsx_ld(0, dst)); const uint8x16_t v1 = vec_avg(vec_vsx_ld(16, src), vec_vsx_ld(16, dst)); vec_vsx_st(v0, 0, dst); vec_vsx_st(v1, 16, dst); src += src_stride; dst += dst_stride; } } static VPX_FORCE_INLINE void avg_w64(const uint8_t *src, ptrdiff_t src_stride, uint8_t *dst, ptrdiff_t dst_stride, int32_t h) { int i; for (i = h; i--;) { const uint8x16_t v0 = vec_avg(vec_vsx_ld(0, src), vec_vsx_ld(0, dst)); const uint8x16_t v1 = vec_avg(vec_vsx_ld(16, src), vec_vsx_ld(16, dst)); const uint8x16_t v2 = vec_avg(vec_vsx_ld(32, src), vec_vsx_ld(32, dst)); const uint8x16_t v3 = vec_avg(vec_vsx_ld(48, src), vec_vsx_ld(48, dst)); vec_vsx_st(v0, 0, dst); vec_vsx_st(v1, 16, dst); vec_vsx_st(v2, 32, dst); vec_vsx_st(v3, 48, dst); src += src_stride; dst += dst_stride; } } void vpx_convolve_avg_vsx(const uint8_t *src, ptrdiff_t src_stride, uint8_t *dst, ptrdiff_t dst_stride, const InterpKernel *filter, int x0_q4, int x_step_q4, int y0_q4, int32_t y_step_q4, int32_t w, int32_t h) { switch (w) { case 16: { avg_w16(src, src_stride, dst, dst_stride, h); break; } case 32: { avg_w32(src, src_stride, dst, dst_stride, h); break; } case 64: { avg_w64(src, src_stride, dst, dst_stride, h); break; } default: { vpx_convolve_avg_c(src, src_stride, dst, dst_stride, filter, x0_q4, x_step_q4, y0_q4, y_step_q4, w, h); break; } } } static VPX_FORCE_INLINE void convolve_line(uint8_t *dst, const int16x8_t s, const int16x8_t f) { const int32x4_t sum = vec_msum(s, f, vec_splat_s32(0)); const int32x4_t bias = vec_sl(vec_splat_s32(1), vec_splat_u32(FILTER_BITS - 1)); const int32x4_t avg = vec_sr(vec_sums(sum, bias), vec_splat_u32(FILTER_BITS)); const uint8x16_t v = vec_splat( vec_packsu(vec_pack(avg, vec_splat_s32(0)), vec_splat_s16(0)), 3); vec_ste(v, 0, dst); } static VPX_FORCE_INLINE void convolve_line_h(uint8_t *dst, const uint8_t *const src_x, const int16_t *const x_filter) { const int16x8_t s = unpack_to_s16_h(vec_vsx_ld(0, src_x)); const int16x8_t f = vec_vsx_ld(0, x_filter); convolve_line(dst, s, f); } // TODO(lu_zero): Implement 8x8 and bigger block special cases static VPX_FORCE_INLINE void convolve_horiz(const uint8_t *src, ptrdiff_t src_stride, uint8_t *dst, ptrdiff_t dst_stride, const InterpKernel *x_filters, int x0_q4, int x_step_q4, int w, int h) { int x, y; src -= SUBPEL_TAPS / 2 - 1; for (y = 0; y < h; ++y) { int x_q4 = x0_q4; for (x = 0; x < w; ++x) { convolve_line_h(dst + x, &src[x_q4 >> SUBPEL_BITS], x_filters[x_q4 & SUBPEL_MASK]); x_q4 += x_step_q4; } src += src_stride; dst += dst_stride; } } static VPX_FORCE_INLINE void convolve_avg_horiz( const uint8_t *src, ptrdiff_t src_stride, uint8_t *dst, ptrdiff_t dst_stride, const InterpKernel *x_filters, int x0_q4, int x_step_q4, int w, int h) { int x, y; src -= SUBPEL_TAPS / 2 - 1; for (y = 0; y < h; ++y) { int x_q4 = x0_q4; for (x = 0; x < w; ++x) { uint8_t v; convolve_line_h(&v, &src[x_q4 >> SUBPEL_BITS], x_filters[x_q4 & SUBPEL_MASK]); dst[x] = ROUND_POWER_OF_TWO(dst[x] + v, 1); x_q4 += x_step_q4; } src += src_stride; dst += dst_stride; } } static uint8x16_t transpose_line_u8_8x8(uint8x16_t a, uint8x16_t b, uint8x16_t c, uint8x16_t d, uint8x16_t e, uint8x16_t f, uint8x16_t g, uint8x16_t h) { uint16x8_t ab = (uint16x8_t)vec_mergeh(a, b); uint16x8_t cd = (uint16x8_t)vec_mergeh(c, d); uint16x8_t ef = (uint16x8_t)vec_mergeh(e, f); uint16x8_t gh = (uint16x8_t)vec_mergeh(g, h); uint32x4_t abcd = (uint32x4_t)vec_mergeh(ab, cd); uint32x4_t efgh = (uint32x4_t)vec_mergeh(ef, gh); return (uint8x16_t)vec_mergeh(abcd, efgh); } static VPX_FORCE_INLINE void convolve_line_v(uint8_t *dst, const uint8_t *const src_y, ptrdiff_t src_stride, const int16_t *const y_filter) { uint8x16_t s0 = vec_vsx_ld(0, src_y + 0 * src_stride); uint8x16_t s1 = vec_vsx_ld(0, src_y + 1 * src_stride); uint8x16_t s2 = vec_vsx_ld(0, src_y + 2 * src_stride); uint8x16_t s3 = vec_vsx_ld(0, src_y + 3 * src_stride); uint8x16_t s4 = vec_vsx_ld(0, src_y + 4 * src_stride); uint8x16_t s5 = vec_vsx_ld(0, src_y + 5 * src_stride); uint8x16_t s6 = vec_vsx_ld(0, src_y + 6 * src_stride); uint8x16_t s7 = vec_vsx_ld(0, src_y + 7 * src_stride); const int16x8_t f = vec_vsx_ld(0, y_filter); uint8_t buf[16]; const uint8x16_t s = transpose_line_u8_8x8(s0, s1, s2, s3, s4, s5, s6, s7); vec_vsx_st(s, 0, buf); convolve_line(dst, unpack_to_s16_h(s), f); } static VPX_FORCE_INLINE void convolve_vert(const uint8_t *src, ptrdiff_t src_stride, uint8_t *dst, ptrdiff_t dst_stride, const InterpKernel *y_filters, int y0_q4, int y_step_q4, int w, int h) { int x, y; src -= src_stride * (SUBPEL_TAPS / 2 - 1); for (x = 0; x < w; ++x) { int y_q4 = y0_q4; for (y = 0; y < h; ++y) { convolve_line_v(dst + y * dst_stride, &src[(y_q4 >> SUBPEL_BITS) * src_stride], src_stride, y_filters[y_q4 & SUBPEL_MASK]); y_q4 += y_step_q4; } ++src; ++dst; } } static VPX_FORCE_INLINE void convolve_avg_vert( const uint8_t *src, ptrdiff_t src_stride, uint8_t *dst, ptrdiff_t dst_stride, const InterpKernel *y_filters, int y0_q4, int y_step_q4, int w, int h) { int x, y; src -= src_stride * (SUBPEL_TAPS / 2 - 1); for (x = 0; x < w; ++x) { int y_q4 = y0_q4; for (y = 0; y < h; ++y) { uint8_t v; convolve_line_v(&v, &src[(y_q4 >> SUBPEL_BITS) * src_stride], src_stride, y_filters[y_q4 & SUBPEL_MASK]); dst[y * dst_stride] = ROUND_POWER_OF_TWO(dst[y * dst_stride] + v, 1); y_q4 += y_step_q4; } ++src; ++dst; } } static VPX_FORCE_INLINE void convolve(const uint8_t *src, ptrdiff_t src_stride, uint8_t *dst, ptrdiff_t dst_stride, const InterpKernel *const filter, int x0_q4, int x_step_q4, int y0_q4, int y_step_q4, int w, int h) { // Note: Fixed size intermediate buffer, temp, places limits on parameters. // 2d filtering proceeds in 2 steps: // (1) Interpolate horizontally into an intermediate buffer, temp. // (2) Interpolate temp vertically to derive the sub-pixel result. // Deriving the maximum number of rows in the temp buffer (135): // --Smallest scaling factor is x1/2 ==> y_step_q4 = 32 (Normative). // --Largest block size is 64x64 pixels. // --64 rows in the downscaled frame span a distance of (64 - 1) * 32 in the // original frame (in 1/16th pixel units). // --Must round-up because block may be located at sub-pixel position. // --Require an additional SUBPEL_TAPS rows for the 8-tap filter tails. // --((64 - 1) * 32 + 15) >> 4 + 8 = 135. DECLARE_ALIGNED(16, uint8_t, temp[64 * 135]); const int intermediate_height = (((h - 1) * y_step_q4 + y0_q4) >> SUBPEL_BITS) + SUBPEL_TAPS; assert(w <= 64); assert(h <= 64); assert(y_step_q4 <= 32); assert(x_step_q4 <= 32); convolve_horiz(src - src_stride * (SUBPEL_TAPS / 2 - 1), src_stride, temp, 64, filter, x0_q4, x_step_q4, w, intermediate_height); convolve_vert(temp + 64 * (SUBPEL_TAPS / 2 - 1), 64, dst, dst_stride, filter, y0_q4, y_step_q4, w, h); } void vpx_convolve8_horiz_vsx(const uint8_t *src, ptrdiff_t src_stride, uint8_t *dst, ptrdiff_t dst_stride, const InterpKernel *filter, int x0_q4, int x_step_q4, int y0_q4, int y_step_q4, int w, int h) { (void)y0_q4; (void)y_step_q4; convolve_horiz(src, src_stride, dst, dst_stride, filter, x0_q4, x_step_q4, w, h); } void vpx_convolve8_avg_horiz_vsx(const uint8_t *src, ptrdiff_t src_stride, uint8_t *dst, ptrdiff_t dst_stride, const InterpKernel *filter, int x0_q4, int x_step_q4, int y0_q4, int y_step_q4, int w, int h) { (void)y0_q4; (void)y_step_q4; convolve_avg_horiz(src, src_stride, dst, dst_stride, filter, x0_q4, x_step_q4, w, h); } void vpx_convolve8_vert_vsx(const uint8_t *src, ptrdiff_t src_stride, uint8_t *dst, ptrdiff_t dst_stride, const InterpKernel *filter, int x0_q4, int x_step_q4, int y0_q4, int y_step_q4, int w, int h) { (void)x0_q4; (void)x_step_q4; convolve_vert(src, src_stride, dst, dst_stride, filter, y0_q4, y_step_q4, w, h); } void vpx_convolve8_avg_vert_vsx(const uint8_t *src, ptrdiff_t src_stride, uint8_t *dst, ptrdiff_t dst_stride, const InterpKernel *filter, int x0_q4, int x_step_q4, int y0_q4, int y_step_q4, int w, int h) { (void)x0_q4; (void)x_step_q4; convolve_avg_vert(src, src_stride, dst, dst_stride, filter, y0_q4, y_step_q4, w, h); } void vpx_convolve8_vsx(const uint8_t *src, ptrdiff_t src_stride, uint8_t *dst, ptrdiff_t dst_stride, const InterpKernel *filter, int x0_q4, int x_step_q4, int y0_q4, int y_step_q4, int w, int h) { convolve(src, src_stride, dst, dst_stride, filter, x0_q4, x_step_q4, y0_q4, y_step_q4, w, h); } void vpx_convolve8_avg_vsx(const uint8_t *src, ptrdiff_t src_stride, uint8_t *dst, ptrdiff_t dst_stride, const InterpKernel *filter, int x0_q4, int x_step_q4, int y0_q4, int y_step_q4, int w, int h) { // Fixed size intermediate buffer places limits on parameters. DECLARE_ALIGNED(16, uint8_t, temp[64 * 64]); assert(w <= 64); assert(h <= 64); vpx_convolve8_vsx(src, src_stride, temp, 64, filter, x0_q4, x_step_q4, y0_q4, y_step_q4, w, h); vpx_convolve_avg_vsx(temp, 64, dst, dst_stride, NULL, 0, 0, 0, 0, w, h); }