зеркало из https://github.com/mozilla/gecko-dev.git
145 строки
4.2 KiB
C
145 строки
4.2 KiB
C
/*
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* Copyright © 2018, VideoLAN and dav1d authors
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* Copyright © 2018, Two Orioles, LLC
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions are met:
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*
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* 1. Redistributions of source code must retain the above copyright notice, this
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* list of conditions and the following disclaimer.
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*
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* 2. Redistributions in binary form must reproduce the above copyright notice,
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* this list of conditions and the following disclaimer in the documentation
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* and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED
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* WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
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* DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR
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* ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
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* (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
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* LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
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* ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
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* SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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#ifndef DAV1D_COMMON_ATTRIBUTES_H
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#define DAV1D_COMMON_ATTRIBUTES_H
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#include "config.h"
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#include <stddef.h>
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#ifdef __GNUC__
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#define ATTR_ALIAS __attribute__((may_alias))
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#define ATTR_FORMAT_PRINTF(fmt, attr) __attribute__((__format__(__printf__, fmt, attr)))
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#define COLD __attribute__((cold))
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#else
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#define ATTR_ALIAS
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#define ATTR_FORMAT_PRINTF(fmt, attr)
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#define COLD
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#endif
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#if ARCH_X86_64
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/* x86-64 needs 32-byte alignment for AVX2. */
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#define ALIGN_32_VAL 32
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#define ALIGN_16_VAL 16
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#elif ARCH_X86_32 || ARCH_ARM || ARCH_AARCH64
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/* ARM doesn't benefit from anything more than 16-byte alignment. */
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#define ALIGN_32_VAL 16
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#define ALIGN_16_VAL 16
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#else
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/* No need for extra alignment on platforms without assembly. */
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#define ALIGN_32_VAL 8
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#define ALIGN_16_VAL 8
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#endif
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/*
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* API for variables, struct members (ALIGN()) like:
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* uint8_t var[1][2][3][4]
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* becomes:
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* ALIGN(uint8_t var[1][2][3][4], alignment).
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*/
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#ifdef _MSC_VER
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#define ALIGN(ll, a) \
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__declspec(align(a)) ll
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#else
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#define ALIGN(line, align) \
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line __attribute__((aligned(align)))
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#endif
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/*
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* API for stack alignment (ALIGN_STK_$align()) of variables like:
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* uint8_t var[1][2][3][4]
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* becomes:
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* ALIGN_STK_$align(uint8_t, var, 1, [2][3][4])
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*/
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#define ALIGN_STK_32(type, var, sz1d, sznd) \
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ALIGN(type var[sz1d]sznd, ALIGN_32_VAL)
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// as long as stack is itself 16-byte aligned, this works (win64, gcc)
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#define ALIGN_STK_16(type, var, sz1d, sznd) \
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ALIGN(type var[sz1d]sznd, ALIGN_16_VAL)
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/*
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* Forbid inlining of a function:
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* static NOINLINE void func() {}
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*/
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#ifdef _MSC_VER
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#define NOINLINE __declspec(noinline)
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#else /* !_MSC_VER */
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#define NOINLINE __attribute__((noinline))
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#endif /* !_MSC_VER */
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#if defined(__GNUC__) && !defined(__INTEL_COMPILER) && !defined(__clang__)
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# define dav1d_uninit(x) x=x
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#else
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# define dav1d_uninit(x) x
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#endif
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#ifdef _MSC_VER
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#include <intrin.h>
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static inline int ctz(const unsigned int mask) {
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unsigned long idx;
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_BitScanForward(&idx, mask);
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return idx;
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}
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static inline int clz(const unsigned int mask) {
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unsigned long leading_zero = 0;
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_BitScanReverse(&leading_zero, mask);
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return (31 - leading_zero);
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}
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#ifdef _WIN64
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static inline int clzll(const unsigned long long mask) {
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unsigned long leading_zero = 0;
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_BitScanReverse64(&leading_zero, mask);
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return (63 - leading_zero);
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}
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#else /* _WIN64 */
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static inline int clzll(const unsigned long long mask) {
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if (mask >> 32)
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return clz((unsigned)(mask >> 32));
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else
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return clz((unsigned)mask) + 32;
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}
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#endif /* _WIN64 */
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#else /* !_MSC_VER */
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static inline int ctz(const unsigned int mask) {
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return __builtin_ctz(mask);
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}
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static inline int clz(const unsigned int mask) {
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return __builtin_clz(mask);
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}
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static inline int clzll(const unsigned long long mask) {
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return __builtin_clzll(mask);
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}
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#endif /* !_MSC_VER */
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#endif /* DAV1D_COMMON_ATTRIBUTES_H */
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