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ffmpeg / libavcodec / ppc / util_altivec.h @ 2912e87a

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/*
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 * This file is part of Libav.
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 *
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 * Libav is free software; you can redistribute it and/or
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 * modify it under the terms of the GNU Lesser General Public
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 * License as published by the Free Software Foundation; either
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 * version 2.1 of the License, or (at your option) any later version.
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 *
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 * Libav is distributed in the hope that it will be useful,
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 * but WITHOUT ANY WARRANTY; without even the implied warranty of
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 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
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 * Lesser General Public License for more details.
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 *
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 * You should have received a copy of the GNU Lesser General Public
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 * License along with Libav; if not, write to the Free Software
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 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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 */
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/**
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 * @file
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 * Contains misc utility macros and inline functions
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 */
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#ifndef AVCODEC_PPC_UTIL_ALTIVEC_H
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#define AVCODEC_PPC_UTIL_ALTIVEC_H
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#include <stdint.h>
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#include "config.h"
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#if HAVE_ALTIVEC_H
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#include <altivec.h>
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#endif
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#include "types_altivec.h"
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// used to build registers permutation vectors (vcprm)
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// the 's' are for words in the _s_econd vector
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#define WORD_0 0x00,0x01,0x02,0x03
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#define WORD_1 0x04,0x05,0x06,0x07
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#define WORD_2 0x08,0x09,0x0a,0x0b
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#define WORD_3 0x0c,0x0d,0x0e,0x0f
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#define WORD_s0 0x10,0x11,0x12,0x13
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#define WORD_s1 0x14,0x15,0x16,0x17
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#define WORD_s2 0x18,0x19,0x1a,0x1b
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#define WORD_s3 0x1c,0x1d,0x1e,0x1f
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#define vcprm(a,b,c,d) (const vector unsigned char){WORD_ ## a, WORD_ ## b, WORD_ ## c, WORD_ ## d}
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#define vcii(a,b,c,d) (const vector float){FLOAT_ ## a, FLOAT_ ## b, FLOAT_ ## c, FLOAT_ ## d}
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// vcprmle is used to keep the same index as in the SSE version.
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// it's the same as vcprm, with the index inversed
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// ('le' is Little Endian)
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#define vcprmle(a,b,c,d) vcprm(d,c,b,a)
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// used to build inverse/identity vectors (vcii)
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// n is _n_egative, p is _p_ositive
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#define FLOAT_n -1.
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#define FLOAT_p 1.
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// Transpose 8x8 matrix of 16-bit elements (in-place)
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#define TRANSPOSE8(a,b,c,d,e,f,g,h) \
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do { \
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    vector signed short A1, B1, C1, D1, E1, F1, G1, H1; \
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    vector signed short A2, B2, C2, D2, E2, F2, G2, H2; \
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 \
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    A1 = vec_mergeh (a, e); \
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    B1 = vec_mergel (a, e); \
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    C1 = vec_mergeh (b, f); \
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    D1 = vec_mergel (b, f); \
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    E1 = vec_mergeh (c, g); \
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    F1 = vec_mergel (c, g); \
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    G1 = vec_mergeh (d, h); \
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    H1 = vec_mergel (d, h); \
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 \
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    A2 = vec_mergeh (A1, E1); \
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    B2 = vec_mergel (A1, E1); \
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    C2 = vec_mergeh (B1, F1); \
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    D2 = vec_mergel (B1, F1); \
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    E2 = vec_mergeh (C1, G1); \
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    F2 = vec_mergel (C1, G1); \
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    G2 = vec_mergeh (D1, H1); \
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    H2 = vec_mergel (D1, H1); \
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 \
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    a = vec_mergeh (A2, E2); \
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    b = vec_mergel (A2, E2); \
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    c = vec_mergeh (B2, F2); \
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    d = vec_mergel (B2, F2); \
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    e = vec_mergeh (C2, G2); \
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    f = vec_mergel (C2, G2); \
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    g = vec_mergeh (D2, H2); \
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    h = vec_mergel (D2, H2); \
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} while (0)
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/** \brief loads unaligned vector \a *src with offset \a offset
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    and returns it */
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static inline vector unsigned char unaligned_load(int offset, uint8_t *src)
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{
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    register vector unsigned char first = vec_ld(offset, src);
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    register vector unsigned char second = vec_ld(offset+15, src);
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    register vector unsigned char mask = vec_lvsl(offset, src);
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    return vec_perm(first, second, mask);
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}
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/**
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 * loads vector known misalignment
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 * @param perm_vec the align permute vector to combine the two loads from lvsl
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 */
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static inline vec_u8 load_with_perm_vec(int offset, uint8_t *src, vec_u8 perm_vec)
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{
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    vec_u8 a = vec_ld(offset, src);
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    vec_u8 b = vec_ld(offset+15, src);
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    return vec_perm(a, b, perm_vec);
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}
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#endif /* AVCODEC_PPC_UTIL_ALTIVEC_H */