ref: d52533651f72a3e81a103b460d08059d39c1c3f2
dir: /include/common/attributes.h/
/* * 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 "config.h" #include <stddef.h> #ifdef __GNUC__ #define ATTR_ALIAS __attribute__((may_alias)) #else #define ATTR_ALIAS #endif #if ARCH_X86 #define ALIGN_32_VAL 32 #define ALIGN_16_VAL 16 #elif ARCH_ARM || ARCH_AARCH64 // ARM doesn't benefit from anything more than 16 byte alignment. #define ALIGN_32_VAL 16 #define ALIGN_16_VAL 16 #else // No need for extra alignment on platforms without assembly. #define ALIGN_32_VAL 8 #define ALIGN_16_VAL 8 #endif /* * API for variables, struct members (ALIGN()) like: * uint8_t var[1][2][3][4] * becomes: * ALIGN(uint8_t var[1][2][3][4], alignment). */ #ifdef _MSC_VER #define ALIGN(ll, a) \ __declspec(align(a)) ll #else #define ALIGN(line, align) \ line __attribute__((aligned(align))) #endif /* * 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, ALIGN_32_VAL) // 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, ALIGN_16_VAL) /* * Forbid inlining of a function: * static NOINLINE void func() {} */ #ifdef _MSC_VER #define NOINLINE __declspec(noinline) #else /* !_MSC_VER */ #define NOINLINE __attribute__((noinline)) #endif /* !_MSC_VER */ #if defined(__GNUC__) && !defined(__INTEL_COMPILER) && !defined(__clang__) # define dav1d_uninit(x) x=x #else # define dav1d_uninit(x) x #endif #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); } #ifdef _WIN64 static inline int clzll(const unsigned long long mask) { unsigned long leading_zero = 0; _BitScanReverse64(&leading_zero, mask); return (63 - leading_zero); } #else /* _WIN64 */ static inline int clzll(const unsigned long long mask) { if (mask >> 32) return clz((unsigned)(mask >> 32)); else return clz((unsigned)mask) + 32; } #endif /* _WIN64 */ #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__ */