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+/*
+ * 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_VPX_DSP_PPC_TRANSPOSE_VSX_H_
+#define VPX_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
+}
+
+static INLINE void transpose_8x8(const int16x8_t *a, int16x8_t *b) {
+ // Stage 1
+ const int16x8_t s1_0 = vec_mergeh(a[0], a[4]);
+ const int16x8_t s1_1 = vec_mergel(a[0], a[4]);
+ const int16x8_t s1_2 = vec_mergeh(a[1], a[5]);
+ const int16x8_t s1_3 = vec_mergel(a[1], a[5]);
+ const int16x8_t s1_4 = vec_mergeh(a[2], a[6]);
+ const int16x8_t s1_5 = vec_mergel(a[2], a[6]);
+ const int16x8_t s1_6 = vec_mergeh(a[3], a[7]);
+ const int16x8_t s1_7 = vec_mergel(a[3], a[7]);
+
+ // Stage 2
+ const int16x8_t s2_0 = vec_mergeh(s1_0, s1_4);
+ const int16x8_t s2_1 = vec_mergel(s1_0, s1_4);
+ const int16x8_t s2_2 = vec_mergeh(s1_1, s1_5);
+ const int16x8_t s2_3 = vec_mergel(s1_1, s1_5);
+ const int16x8_t s2_4 = vec_mergeh(s1_2, s1_6);
+ const int16x8_t s2_5 = vec_mergel(s1_2, s1_6);
+ const int16x8_t s2_6 = vec_mergeh(s1_3, s1_7);
+ const int16x8_t s2_7 = vec_mergel(s1_3, s1_7);
+
+ // Stage 2
+ b[0] = vec_mergeh(s2_0, s2_4);
+ b[1] = vec_mergel(s2_0, s2_4);
+ b[2] = vec_mergeh(s2_1, s2_5);
+ b[3] = vec_mergel(s2_1, s2_5);
+ b[4] = vec_mergeh(s2_2, s2_6);
+ b[5] = vec_mergel(s2_2, s2_6);
+ b[6] = vec_mergeh(s2_3, s2_7);
+ b[7] = vec_mergel(s2_3, s2_7);
+}
+
+#endif // VPX_VPX_DSP_PPC_TRANSPOSE_VSX_H_