405b94c661
Change-Id: I3b4b043c1402b4100653ace4869847e030861b18 Signed-off-by: Rafael de Lucena Valle <rafaeldelucena@gmail.com>
102 lines
3.0 KiB
C
102 lines
3.0 KiB
C
/*
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* Copyright (c) 2017 The WebM project authors. All Rights Reserved.
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*
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* Use of this source code is governed by a BSD-style license
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* that can be found in the LICENSE file in the root of the source
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* tree. An additional intellectual property rights grant can be found
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* in the file PATENTS. All contributing project authors may
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* be found in the AUTHORS file in the root of the source tree.
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*/
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#ifndef VPX_DSP_PPC_TRANSPOSE_VSX_H_
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#define VPX_DSP_PPC_TRANSPOSE_VSX_H_
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#include "./vpx_config.h"
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#include "vpx_dsp/ppc/types_vsx.h"
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static INLINE void vpx_transpose_s16_8x8(int16x8_t v[8]) {
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// d = vec_mergeh(a,b):
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// The even elements of the result are obtained left-to-right,
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// from the high elements of a.
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// The odd elements of the result are obtained left-to-right,
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// from the high elements of b.
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//
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// d = vec_mergel(a,b):
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// The even elements of the result are obtained left-to-right,
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// from the low elements of a.
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// The odd elements of the result are obtained left-to-right,
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// from the low elements of b.
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// Example, starting with:
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// v[0]: 00 01 02 03 04 05 06 07
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// v[1]: 10 11 12 13 14 15 16 17
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// v[2]: 20 21 22 23 24 25 26 27
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// v[3]: 30 31 32 33 34 35 36 37
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// v[4]: 40 41 42 43 44 45 46 47
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// v[5]: 50 51 52 53 54 55 56 57
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// v[6]: 60 61 62 63 64 65 66 67
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// v[7]: 70 71 72 73 74 75 76 77
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int16x8_t b0, b1, b2, b3, b4, b5, b6, b7;
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int16x8_t c0, c1, c2, c3, c4, c5, c6, c7;
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b0 = vec_mergeh(v[0], v[4]);
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b1 = vec_mergel(v[0], v[4]);
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b2 = vec_mergeh(v[1], v[5]);
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b3 = vec_mergel(v[1], v[5]);
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b4 = vec_mergeh(v[2], v[6]);
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b5 = vec_mergel(v[2], v[6]);
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b6 = vec_mergeh(v[3], v[7]);
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b7 = vec_mergel(v[3], v[7]);
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// After first merge operation
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// b0: 00 40 01 41 02 42 03 43
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// b1: 04 44 05 45 06 46 07 47
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// b2: 10 50 11 51 12 52 13 53
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// b3: 14 54 15 55 16 56 17 57
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// b4: 20 60 21 61 22 62 23 63
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// b5: 24 64 25 65 26 66 27 67
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// b6: 30 70 31 71 32 62 33 73
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// b7: 34 74 35 75 36 76 37 77
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c0 = vec_mergeh(b0, b4);
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c1 = vec_mergel(b0, b4);
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c2 = vec_mergeh(b1, b5);
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c3 = vec_mergel(b1, b5);
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c4 = vec_mergeh(b2, b6);
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c5 = vec_mergel(b2, b6);
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c6 = vec_mergeh(b3, b7);
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c7 = vec_mergel(b3, b7);
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// After second merge operation
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// c0: 00 20 40 60 01 21 41 61
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// c1: 02 22 42 62 03 23 43 63
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// c2: 04 24 44 64 05 25 45 65
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// c3: 06 26 46 66 07 27 47 67
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// c4: 10 30 50 70 11 31 51 71
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// c5: 12 32 52 72 13 33 53 73
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// c6: 14 34 54 74 15 35 55 75
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// c7: 16 36 56 76 17 37 57 77
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v[0] = vec_mergeh(c0, c4);
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v[1] = vec_mergel(c0, c4);
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v[2] = vec_mergeh(c1, c5);
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v[3] = vec_mergel(c1, c5);
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v[4] = vec_mergeh(c2, c6);
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v[5] = vec_mergel(c2, c6);
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v[6] = vec_mergeh(c3, c7);
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v[7] = vec_mergel(c3, c7);
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// After last merge operation
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// v[0]: 00 10 20 30 40 50 60 70
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// v[1]: 01 11 21 31 41 51 61 71
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// v[2]: 02 12 22 32 42 52 62 72
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// v[3]: 03 13 23 33 43 53 63 73
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// v[4]: 04 14 24 34 44 54 64 74
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// v[5]: 05 15 25 35 45 55 65 75
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// v[6]: 06 16 26 36 46 56 66 76
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// v[7]: 07 17 27 37 47 57 67 77
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}
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#endif // VPX_DSP_PPC_TRANSPOSE_VSX_H_
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