1 // Copyright 2016 Google Inc. All Rights Reserved. 2 // 3 // Use of this source code is governed by a BSD-style license 4 // that can be found in the COPYING file in the root of the source 5 // tree. An additional intellectual property rights grant can be found 6 // in the file PATENTS. All contributing project authors may 7 // be found in the AUTHORS file in the root of the source tree. 8 // ----------------------------------------------------------------------------- 9 // 10 // SSE2 code common to several files. 11 // 12 // Author: Vincent Rabaud (vrabaud (at) google.com) 13 14 #ifndef WEBP_DSP_COMMON_SSE2_H_ 15 #define WEBP_DSP_COMMON_SSE2_H_ 16 17 #ifdef __cplusplus 18 extern "C" { 19 #endif 20 21 #if defined(WEBP_USE_SSE2) 22 23 #include <emmintrin.h> 24 25 //------------------------------------------------------------------------------ 26 // Quite useful macro for debugging. Left here for convenience. 27 28 #if 0 29 #include <stdio.h> 30 static WEBP_INLINE void PrintReg(const __m128i r, const char* const name, 31 int size) { 32 int n; 33 union { 34 __m128i r; 35 uint8_t i8[16]; 36 uint16_t i16[8]; 37 uint32_t i32[4]; 38 uint64_t i64[2]; 39 } tmp; 40 tmp.r = r; 41 fprintf(stderr, "%s\t: ", name); 42 if (size == 8) { 43 for (n = 0; n < 16; ++n) fprintf(stderr, "%.2x ", tmp.i8[n]); 44 } else if (size == 16) { 45 for (n = 0; n < 8; ++n) fprintf(stderr, "%.4x ", tmp.i16[n]); 46 } else if (size == 32) { 47 for (n = 0; n < 4; ++n) fprintf(stderr, "%.8x ", tmp.i32[n]); 48 } else { 49 for (n = 0; n < 2; ++n) fprintf(stderr, "%.16lx ", tmp.i64[n]); 50 } 51 fprintf(stderr, "\n"); 52 } 53 #endif 54 55 //------------------------------------------------------------------------------ 56 // Math functions. 57 58 // Return the sum of all the 8b in the register. 59 static WEBP_INLINE int VP8HorizontalAdd8b(const __m128i* const a) { 60 const __m128i zero = _mm_setzero_si128(); 61 const __m128i sad8x2 = _mm_sad_epu8(*a, zero); 62 // sum the two sads: sad8x2[0:1] + sad8x2[8:9] 63 const __m128i sum = _mm_add_epi32(sad8x2, _mm_shuffle_epi32(sad8x2, 2)); 64 return _mm_cvtsi128_si32(sum); 65 } 66 67 // Transpose two 4x4 16b matrices horizontally stored in registers. 68 static WEBP_INLINE void VP8Transpose_2_4x4_16b( 69 const __m128i* const in0, const __m128i* const in1, 70 const __m128i* const in2, const __m128i* const in3, __m128i* const out0, 71 __m128i* const out1, __m128i* const out2, __m128i* const out3) { 72 // Transpose the two 4x4. 73 // a00 a01 a02 a03 b00 b01 b02 b03 74 // a10 a11 a12 a13 b10 b11 b12 b13 75 // a20 a21 a22 a23 b20 b21 b22 b23 76 // a30 a31 a32 a33 b30 b31 b32 b33 77 const __m128i transpose0_0 = _mm_unpacklo_epi16(*in0, *in1); 78 const __m128i transpose0_1 = _mm_unpacklo_epi16(*in2, *in3); 79 const __m128i transpose0_2 = _mm_unpackhi_epi16(*in0, *in1); 80 const __m128i transpose0_3 = _mm_unpackhi_epi16(*in2, *in3); 81 // a00 a10 a01 a11 a02 a12 a03 a13 82 // a20 a30 a21 a31 a22 a32 a23 a33 83 // b00 b10 b01 b11 b02 b12 b03 b13 84 // b20 b30 b21 b31 b22 b32 b23 b33 85 const __m128i transpose1_0 = _mm_unpacklo_epi32(transpose0_0, transpose0_1); 86 const __m128i transpose1_1 = _mm_unpacklo_epi32(transpose0_2, transpose0_3); 87 const __m128i transpose1_2 = _mm_unpackhi_epi32(transpose0_0, transpose0_1); 88 const __m128i transpose1_3 = _mm_unpackhi_epi32(transpose0_2, transpose0_3); 89 // a00 a10 a20 a30 a01 a11 a21 a31 90 // b00 b10 b20 b30 b01 b11 b21 b31 91 // a02 a12 a22 a32 a03 a13 a23 a33 92 // b02 b12 a22 b32 b03 b13 b23 b33 93 *out0 = _mm_unpacklo_epi64(transpose1_0, transpose1_1); 94 *out1 = _mm_unpackhi_epi64(transpose1_0, transpose1_1); 95 *out2 = _mm_unpacklo_epi64(transpose1_2, transpose1_3); 96 *out3 = _mm_unpackhi_epi64(transpose1_2, transpose1_3); 97 // a00 a10 a20 a30 b00 b10 b20 b30 98 // a01 a11 a21 a31 b01 b11 b21 b31 99 // a02 a12 a22 a32 b02 b12 b22 b32 100 // a03 a13 a23 a33 b03 b13 b23 b33 101 } 102 103 //------------------------------------------------------------------------------ 104 // Channel mixing. 105 106 // Function used several times in VP8PlanarTo24b. 107 // It samples the in buffer as follows: one every two unsigned char is stored 108 // at the beginning of the buffer, while the other half is stored at the end. 109 #define VP8PlanarTo24bHelper(IN, OUT) \ 110 do { \ 111 const __m128i v_mask = _mm_set1_epi16(0x00ff); \ 112 /* Take one every two upper 8b values.*/ \ 113 (OUT##0) = _mm_packus_epi16(_mm_and_si128((IN##0), v_mask), \ 114 _mm_and_si128((IN##1), v_mask)); \ 115 (OUT##1) = _mm_packus_epi16(_mm_and_si128((IN##2), v_mask), \ 116 _mm_and_si128((IN##3), v_mask)); \ 117 (OUT##2) = _mm_packus_epi16(_mm_and_si128((IN##4), v_mask), \ 118 _mm_and_si128((IN##5), v_mask)); \ 119 /* Take one every two lower 8b values.*/ \ 120 (OUT##3) = _mm_packus_epi16(_mm_srli_epi16((IN##0), 8), \ 121 _mm_srli_epi16((IN##1), 8)); \ 122 (OUT##4) = _mm_packus_epi16(_mm_srli_epi16((IN##2), 8), \ 123 _mm_srli_epi16((IN##3), 8)); \ 124 (OUT##5) = _mm_packus_epi16(_mm_srli_epi16((IN##4), 8), \ 125 _mm_srli_epi16((IN##5), 8)); \ 126 } while (0) 127 128 // Pack the planar buffers 129 // rrrr... rrrr... gggg... gggg... bbbb... bbbb.... 130 // triplet by triplet in the output buffer rgb as rgbrgbrgbrgb ... 131 static WEBP_INLINE void VP8PlanarTo24b(__m128i* const in0, __m128i* const in1, 132 __m128i* const in2, __m128i* const in3, 133 __m128i* const in4, __m128i* const in5) { 134 // The input is 6 registers of sixteen 8b but for the sake of explanation, 135 // let's take 6 registers of four 8b values. 136 // To pack, we will keep taking one every two 8b integer and move it 137 // around as follows: 138 // Input: 139 // r0r1r2r3 | r4r5r6r7 | g0g1g2g3 | g4g5g6g7 | b0b1b2b3 | b4b5b6b7 140 // Split the 6 registers in two sets of 3 registers: the first set as the even 141 // 8b bytes, the second the odd ones: 142 // r0r2r4r6 | g0g2g4g6 | b0b2b4b6 | r1r3r5r7 | g1g3g5g7 | b1b3b5b7 143 // Repeat the same permutations twice more: 144 // r0r4g0g4 | b0b4r1r5 | g1g5b1b5 | r2r6g2g6 | b2b6r3r7 | g3g7b3b7 145 // r0g0b0r1 | g1b1r2g2 | b2r3g3b3 | r4g4b4r5 | g5b5r6g6 | b6r7g7b7 146 __m128i tmp0, tmp1, tmp2, tmp3, tmp4, tmp5; 147 VP8PlanarTo24bHelper(*in, tmp); 148 VP8PlanarTo24bHelper(tmp, *in); 149 VP8PlanarTo24bHelper(*in, tmp); 150 // We need to do it two more times than the example as we have sixteen bytes. 151 { 152 __m128i out0, out1, out2, out3, out4, out5; 153 VP8PlanarTo24bHelper(tmp, out); 154 VP8PlanarTo24bHelper(out, *in); 155 } 156 } 157 158 #undef VP8PlanarTo24bHelper 159 160 // Convert four packed four-channel buffers like argbargbargbargb... into the 161 // split channels aaaaa ... rrrr ... gggg .... bbbbb ...... 162 static WEBP_INLINE void VP8L32bToPlanar(__m128i* const in0, 163 __m128i* const in1, 164 __m128i* const in2, 165 __m128i* const in3) { 166 // Column-wise transpose. 167 const __m128i A0 = _mm_unpacklo_epi8(*in0, *in1); 168 const __m128i A1 = _mm_unpackhi_epi8(*in0, *in1); 169 const __m128i A2 = _mm_unpacklo_epi8(*in2, *in3); 170 const __m128i A3 = _mm_unpackhi_epi8(*in2, *in3); 171 const __m128i B0 = _mm_unpacklo_epi8(A0, A1); 172 const __m128i B1 = _mm_unpackhi_epi8(A0, A1); 173 const __m128i B2 = _mm_unpacklo_epi8(A2, A3); 174 const __m128i B3 = _mm_unpackhi_epi8(A2, A3); 175 // C0 = g7 g6 ... g1 g0 | b7 b6 ... b1 b0 176 // C1 = a7 a6 ... a1 a0 | r7 r6 ... r1 r0 177 const __m128i C0 = _mm_unpacklo_epi8(B0, B1); 178 const __m128i C1 = _mm_unpackhi_epi8(B0, B1); 179 const __m128i C2 = _mm_unpacklo_epi8(B2, B3); 180 const __m128i C3 = _mm_unpackhi_epi8(B2, B3); 181 // Gather the channels. 182 *in0 = _mm_unpackhi_epi64(C1, C3); 183 *in1 = _mm_unpacklo_epi64(C1, C3); 184 *in2 = _mm_unpackhi_epi64(C0, C2); 185 *in3 = _mm_unpacklo_epi64(C0, C2); 186 } 187 188 #endif // WEBP_USE_SSE2 189 190 #ifdef __cplusplus 191 } // extern "C" 192 #endif 193 194 #endif // WEBP_DSP_COMMON_SSE2_H_ 195
