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/*
* 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_COMMON_ATTRIBUTES_H__
#define __DAV1D_COMMON_ATTRIBUTES_H__
#include <stddef.h>
/*
* API for variables, struct members (ALIGN()) like:
* uint8_t var[1][2][3][4]
* becomes:
* ALIGN(uint8_t var[1][2][3][4], alignment).
*/
#define ALIGN(line, align) \
line __attribute__((aligned(align)))
/*
* API for stack alignment (ALIGN_STK_$align()) of variables like:
* uint8_t var[1][2][3][4]
* becomes:
* ALIGN_STK_$align(uint8_t, var, 1, [2][3][4])
*/
#define ALIGN_STK_32(type, var, sz1d, sznd) \
ALIGN(type var[sz1d]sznd, 32)
// as long as stack is itself 16-byte aligned, this works (win64, gcc)
#define ALIGN_STK_16(type, var, sz1d, sznd) \
ALIGN(type var[sz1d]sznd, 16)
#ifdef _MSC_VER
#include <intrin.h>
static inline int ctz(const unsigned int mask) {
unsigned long idx;
_BitScanForward(&idx, mask);
return idx;
}
static inline int clz(const unsigned int mask) {
unsigned long leading_zero = 0;
_BitScanReverse(&leading_zero, mask);
return (31 - leading_zero);
}
static inline int clzll(const unsigned long long mask) {
unsigned long leading_zero = 0;
_BitScanReverse64(&leading_zero, mask);
return (63 - leading_zero);
}
#else /* !_MSC_VER */
static inline int ctz(const unsigned int mask) {
return __builtin_ctz(mask);
}
static inline int clz(const unsigned int mask) {
return __builtin_clz(mask);
}
static inline int clzll(const unsigned long long mask) {
return __builtin_clzll(mask);
}
#endif /* !_MSC_VER */
#endif /* __DAV1D_COMMON_ATTRIBUTES_H__ */
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