ref: 4ddde47d8c295b9307ac750911394000630f6cf8
dir: /vpx_dsp/ppc/transpose_vsx.h/
/* * 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. */ #ifndef VPX_DSP_PPC_TRANSPOSE_VSX_H_ #define VPX_DSP_PPC_TRANSPOSE_VSX_H_ #include "./vpx_config.h" #include "vpx_dsp/ppc/types_vsx.h" static INLINE void vpx_transpose_s16_8x8(int16x8_t v[8]) { // d = vec_mergeh(a,b): // The even elements of the result are obtained left-to-right, // from the high elements of a. // The odd elements of the result are obtained left-to-right, // from the high elements of b. // // d = vec_mergel(a,b): // The even elements of the result are obtained left-to-right, // from the low elements of a. // The odd elements of the result are obtained left-to-right, // from the low elements of b. // Example, starting with: // v[0]: 00 01 02 03 04 05 06 07 // v[1]: 10 11 12 13 14 15 16 17 // v[2]: 20 21 22 23 24 25 26 27 // v[3]: 30 31 32 33 34 35 36 37 // v[4]: 40 41 42 43 44 45 46 47 // v[5]: 50 51 52 53 54 55 56 57 // v[6]: 60 61 62 63 64 65 66 67 // v[7]: 70 71 72 73 74 75 76 77 int16x8_t b0, b1, b2, b3, b4, b5, b6, b7; int16x8_t c0, c1, c2, c3, c4, c5, c6, c7; b0 = vec_mergeh(v[0], v[4]); b1 = vec_mergel(v[0], v[4]); b2 = vec_mergeh(v[1], v[5]); b3 = vec_mergel(v[1], v[5]); b4 = vec_mergeh(v[2], v[6]); b5 = vec_mergel(v[2], v[6]); b6 = vec_mergeh(v[3], v[7]); b7 = vec_mergel(v[3], v[7]); // After first merge operation // b0: 00 40 01 41 02 42 03 43 // b1: 04 44 05 45 06 46 07 47 // b2: 10 50 11 51 12 52 13 53 // b3: 14 54 15 55 16 56 17 57 // b4: 20 60 21 61 22 62 23 63 // b5: 24 64 25 65 26 66 27 67 // b6: 30 70 31 71 32 62 33 73 // b7: 34 74 35 75 36 76 37 77 c0 = vec_mergeh(b0, b4); c1 = vec_mergel(b0, b4); c2 = vec_mergeh(b1, b5); c3 = vec_mergel(b1, b5); c4 = vec_mergeh(b2, b6); c5 = vec_mergel(b2, b6); c6 = vec_mergeh(b3, b7); c7 = vec_mergel(b3, b7); // After second merge operation // c0: 00 20 40 60 01 21 41 61 // c1: 02 22 42 62 03 23 43 63 // c2: 04 24 44 64 05 25 45 65 // c3: 06 26 46 66 07 27 47 67 // c4: 10 30 50 70 11 31 51 71 // c5: 12 32 52 72 13 33 53 73 // c6: 14 34 54 74 15 35 55 75 // c7: 16 36 56 76 17 37 57 77 v[0] = vec_mergeh(c0, c4); v[1] = vec_mergel(c0, c4); v[2] = vec_mergeh(c1, c5); v[3] = vec_mergel(c1, c5); v[4] = vec_mergeh(c2, c6); v[5] = vec_mergel(c2, c6); v[6] = vec_mergeh(c3, c7); v[7] = vec_mergel(c3, c7); // After last merge operation // v[0]: 00 10 20 30 40 50 60 70 // v[1]: 01 11 21 31 41 51 61 71 // v[2]: 02 12 22 32 42 52 62 72 // v[3]: 03 13 23 33 43 53 63 73 // v[4]: 04 14 24 34 44 54 64 74 // v[5]: 05 15 25 35 45 55 65 75 // v[6]: 06 16 26 36 46 56 66 76 // v[7]: 07 17 27 37 47 57 67 77 } #endif // VPX_DSP_PPC_TRANSPOSE_VSX_H_