/*

 * Copyright © 2018, VideoLAN and dav1d authors

 * Copyright © 2018, Two Orioles, LLC

 * All rights reserved.

 *

 * Redistribution and use in source and binary forms, with or without

 * modification, are permitted provided that the following conditions are met:

 *

 * 1. Redistributions of source code must retain the above copyright notice, this

 *    list of conditions and the following disclaimer.

 *

 * 2. Redistributions in binary form must reproduce the above copyright notice,

 *    this list of conditions and the following disclaimer in the documentation

 *    and/or other materials provided with the distribution.

 *

 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND

 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED

 * WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE

 * DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR

 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES

 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;

 * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND

 * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT

 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS

 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.

 */

#ifndef DAV1D_SRC_CTX_H

#define DAV1D_SRC_CTX_H

#include <stdint.h>

#include "common/attributes.h"

#include "common/intops.h"

union alias64 { uint64_t u64; uint8_t u8[8]; } ATTR_ALIAS;

union alias32 { uint32_t u32; uint8_t u8[4]; } ATTR_ALIAS;

union alias16 { uint16_t u16; uint8_t u8[2]; } ATTR_ALIAS;

union alias8 { uint8_t u8; } ATTR_ALIAS;

typedef void (*dav1d_memset_pow2_fn)(void *ptr, int value);

EXTERN const dav1d_memset_pow2_fn dav1d_memset_pow2[6];

static inline void dav1d_memset_likely_pow2(void *const ptr, const int value, const int n) {

    assert(n >= 1 && n <= 32);

    if ((n&(n-1)) == 0) {

        dav1d_memset_pow2[ulog2(n)](ptr, value);

    } else {

        memset(ptr, value, n);

    }

}

Unexecuted instantiation: decode.c:dav1d_memset_likely_pow2

Unexecuted instantiation: lf_mask.c:dav1d_memset_likely_pow2

Unexecuted instantiation: recon_tmpl.c:dav1d_memset_likely_pow2

Unexecuted instantiation: ctx.c:dav1d_memset_likely_pow2

// For smaller sizes use multiplication to broadcast bytes. memset misbehaves on the smaller sizes.

// For the larger sizes, we want to use memset to get access to vector operations.

#define set_ctx1(var, off, val) \

    ((union alias8 *) &(var)[off])->u8 = (val) * 0x01

#define set_ctx2(var, off, val) \

    ((union alias16 *) &(var)[off])->u16 = (val) * 0x0101

#define set_ctx4(var, off, val) \

    ((union alias32 *) &(var)[off])->u32 = (val) * 0x01010101U

#define set_ctx8(var, off, val) \

    ((union alias64 *) &(var)[off])->u64 = (val) * 0x0101010101010101ULL

#define set_ctx16(var, off, val) do { \

        memset(&(var)[off], val, 16); \

    } while (0)

#define set_ctx32(var, off, val) do { \

        memset(&(var)[off], val, 32); \

    } while (0)

#define case_set(var) \

    switch (var) { \

    case 0: set_ctx(set_ctx1); break; \

    case 1: set_ctx(set_ctx2); break; \

    case 2: set_ctx(set_ctx4); break; \

    case 3: set_ctx(set_ctx8); break; \

    case 4: set_ctx(set_ctx16); break; \

    case 5: set_ctx(set_ctx32); break; \

    default: assert(0); \

    }

#define case_set_upto16(var) \

    switch (var) { \

    case 0: set_ctx(set_ctx1); break; \

    case 1: set_ctx(set_ctx2); break; \

    case 2: set_ctx(set_ctx4); break; \

    case 3: set_ctx(set_ctx8); break; \

    case 4: set_ctx(set_ctx16); break; \

    default: assert(0); \

    }

#endif /* DAV1D_SRC_CTX_H */