1 /* 2 * Copyright (c) 2017 The WebM project authors. All Rights Reserved. 3 * 4 * Use of this source code is governed by a BSD-style license 5 * that can be found in the LICENSE file in the root of the source 6 * tree. An additional intellectual property rights grant can be found 7 * in the file PATENTS. All contributing project authors may 8 * be found in the AUTHORS file in the root of the source tree. 9 */ 10 11 #ifndef VPX_DSP_PPC_TRANSPOSE_VSX_H_ 12 #define VPX_DSP_PPC_TRANSPOSE_VSX_H_ 13 14 #include "./vpx_config.h" 15 #include "vpx_dsp/ppc/types_vsx.h" 16 17 static INLINE void vpx_transpose_s16_8x8(int16x8_t v[8]) { 18 // d = vec_mergeh(a,b): 19 // The even elements of the result are obtained left-to-right, 20 // from the high elements of a. 21 // The odd elements of the result are obtained left-to-right, 22 // from the high elements of b. 23 // 24 // d = vec_mergel(a,b): 25 // The even elements of the result are obtained left-to-right, 26 // from the low elements of a. 27 // The odd elements of the result are obtained left-to-right, 28 // from the low elements of b. 29 30 // Example, starting with: 31 // v[0]: 00 01 02 03 04 05 06 07 32 // v[1]: 10 11 12 13 14 15 16 17 33 // v[2]: 20 21 22 23 24 25 26 27 34 // v[3]: 30 31 32 33 34 35 36 37 35 // v[4]: 40 41 42 43 44 45 46 47 36 // v[5]: 50 51 52 53 54 55 56 57 37 // v[6]: 60 61 62 63 64 65 66 67 38 // v[7]: 70 71 72 73 74 75 76 77 39 40 int16x8_t b0, b1, b2, b3, b4, b5, b6, b7; 41 int16x8_t c0, c1, c2, c3, c4, c5, c6, c7; 42 43 b0 = vec_mergeh(v[0], v[4]); 44 b1 = vec_mergel(v[0], v[4]); 45 b2 = vec_mergeh(v[1], v[5]); 46 b3 = vec_mergel(v[1], v[5]); 47 b4 = vec_mergeh(v[2], v[6]); 48 b5 = vec_mergel(v[2], v[6]); 49 b6 = vec_mergeh(v[3], v[7]); 50 b7 = vec_mergel(v[3], v[7]); 51 52 // After first merge operation 53 // b0: 00 40 01 41 02 42 03 43 54 // b1: 04 44 05 45 06 46 07 47 55 // b2: 10 50 11 51 12 52 13 53 56 // b3: 14 54 15 55 16 56 17 57 57 // b4: 20 60 21 61 22 62 23 63 58 // b5: 24 64 25 65 26 66 27 67 59 // b6: 30 70 31 71 32 62 33 73 60 // b7: 34 74 35 75 36 76 37 77 61 62 c0 = vec_mergeh(b0, b4); 63 c1 = vec_mergel(b0, b4); 64 c2 = vec_mergeh(b1, b5); 65 c3 = vec_mergel(b1, b5); 66 c4 = vec_mergeh(b2, b6); 67 c5 = vec_mergel(b2, b6); 68 c6 = vec_mergeh(b3, b7); 69 c7 = vec_mergel(b3, b7); 70 71 // After second merge operation 72 // c0: 00 20 40 60 01 21 41 61 73 // c1: 02 22 42 62 03 23 43 63 74 // c2: 04 24 44 64 05 25 45 65 75 // c3: 06 26 46 66 07 27 47 67 76 // c4: 10 30 50 70 11 31 51 71 77 // c5: 12 32 52 72 13 33 53 73 78 // c6: 14 34 54 74 15 35 55 75 79 // c7: 16 36 56 76 17 37 57 77 80 81 v[0] = vec_mergeh(c0, c4); 82 v[1] = vec_mergel(c0, c4); 83 v[2] = vec_mergeh(c1, c5); 84 v[3] = vec_mergel(c1, c5); 85 v[4] = vec_mergeh(c2, c6); 86 v[5] = vec_mergel(c2, c6); 87 v[6] = vec_mergeh(c3, c7); 88 v[7] = vec_mergel(c3, c7); 89 90 // After last merge operation 91 // v[0]: 00 10 20 30 40 50 60 70 92 // v[1]: 01 11 21 31 41 51 61 71 93 // v[2]: 02 12 22 32 42 52 62 72 94 // v[3]: 03 13 23 33 43 53 63 73 95 // v[4]: 04 14 24 34 44 54 64 74 96 // v[5]: 05 15 25 35 45 55 65 75 97 // v[6]: 06 16 26 36 46 56 66 76 98 // v[7]: 07 17 27 37 47 57 67 77 99 } 100 101 #endif // VPX_DSP_PPC_TRANSPOSE_VSX_H_ 102
