mirror of https://code.videolan.org/videolan/vlc
226 lines
6.0 KiB
C
226 lines
6.0 KiB
C
/*****************************************************************************
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* vlc_cpu.h: CPU capabilities
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*****************************************************************************
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* Copyright (C) 1998-2009 VLC authors and VideoLAN
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU Lesser General Public License as published by
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* the Free Software Foundation; either version 2.1 of the License, or
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* (at your option) any later version.
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*
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* This program 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
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* GNU 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 License
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* along with this program; if not, write to the Free Software Foundation,
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* 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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* This file provides CPU features detection.
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*/
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#ifndef VLC_CPU_H
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# define VLC_CPU_H 1
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#include <vlc_threads.h>
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/**
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* Retrieves CPU capability flags.
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*/
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VLC_API unsigned vlc_CPU(void);
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/**
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* Computes CPU capability flags.
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*
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* Do not call this function directly.
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* Call vlc_CPU() instead, which caches the correct value.
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*/
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unsigned vlc_CPU_raw(void);
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# if defined (__i386__) || defined (__x86_64__)
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# define HAVE_FPU 1
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# define VLC_CPU_SSE2 0x00000080
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# define VLC_CPU_SSE3 0x00000100
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# define VLC_CPU_SSSE3 0x00000200
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# define VLC_CPU_SSE4_1 0x00000400
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# define VLC_CPU_AVX 0x00002000
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# define VLC_CPU_AVX2 0x00004000
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# if defined (__SSE__)
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# define VLC_SSE
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# else
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# define VLC_SSE __attribute__ ((__target__ ("sse")))
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# endif
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# ifdef __SSE2__
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# define vlc_CPU_SSE2() (1)
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# else
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# define vlc_CPU_SSE2() ((vlc_CPU() & VLC_CPU_SSE2) != 0)
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# endif
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# ifdef __SSE3__
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# define vlc_CPU_SSE3() (1)
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# else
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# define vlc_CPU_SSE3() ((vlc_CPU() & VLC_CPU_SSE3) != 0)
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# endif
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# ifdef __SSSE3__
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# define vlc_CPU_SSSE3() (1)
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# else
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# define vlc_CPU_SSSE3() ((vlc_CPU() & VLC_CPU_SSSE3) != 0)
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# endif
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# ifdef __SSE4_1__
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# define vlc_CPU_SSE4_1() (1)
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# else
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# define vlc_CPU_SSE4_1() ((vlc_CPU() & VLC_CPU_SSE4_1) != 0)
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# endif
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# ifdef __AVX__
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# define vlc_CPU_AVX() (1)
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# define VLC_AVX
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# else
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# define vlc_CPU_AVX() ((vlc_CPU() & VLC_CPU_AVX) != 0)
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# define VLC_AVX __attribute__ ((__target__ ("avx")))
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# endif
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# ifdef __AVX2__
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# define vlc_CPU_AVX2() (1)
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# else
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# define vlc_CPU_AVX2() ((vlc_CPU() & VLC_CPU_AVX2) != 0)
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# endif
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# elif defined (__ppc__) || defined (__ppc64__) || defined (__powerpc__)
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# define HAVE_FPU 1
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# define VLC_CPU_ALTIVEC 2
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# ifdef ALTIVEC
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# define vlc_CPU_ALTIVEC() (1)
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# define VLC_ALTIVEC
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# else
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# define vlc_CPU_ALTIVEC() ((vlc_CPU() & VLC_CPU_ALTIVEC) != 0)
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# define VLC_ALTIVEC __attribute__ ((__target__ ("altivec")))
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# endif
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# elif defined (__arm__)
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# if defined (__VFP_FP__) && !defined (__SOFTFP__)
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# define HAVE_FPU 1
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# else
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# define HAVE_FPU 0
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# endif
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# define VLC_CPU_ARMv6 4
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# define VLC_CPU_ARM_NEON 2
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# if defined (__ARM_ARCH_7A__)
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# define VLC_CPU_ARM_ARCH 7
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# elif defined (__ARM_ARCH_6__) || defined (__ARM_ARCH_6T2__)
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# define VLC_CPU_ARM_ARCH 6
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# else
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# define VLC_CPU_ARM_ARCH 4
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# endif
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# if (VLC_CPU_ARM_ARCH >= 6)
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# define vlc_CPU_ARMv6() (1)
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# else
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# define vlc_CPU_ARMv6() ((vlc_CPU() & VLC_CPU_ARMv6) != 0)
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# endif
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# ifdef __ARM_NEON__
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# define vlc_CPU_ARM_NEON() (1)
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# else
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# define vlc_CPU_ARM_NEON() ((vlc_CPU() & VLC_CPU_ARM_NEON) != 0)
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# endif
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# elif defined (__aarch64__)
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# define HAVE_FPU 1
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# define VLC_CPU_ARM_NEON 0x1
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# define VLC_CPU_ARM_SVE 0x2
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# ifdef __ARM_NEON
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# define vlc_CPU_ARM_NEON() (1)
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# else
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# define vlc_CPU_ARM_NEON() ((vlc_CPU() & VLC_CPU_ARM_NEON) != 0)
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# endif
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# ifdef __ARM_FEATURE_SVE
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# define vlc_CPU_ARM_SVE() (1)
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# else
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# define vlc_CPU_ARM_SVE() ((vlc_CPU() & VLC_CPU_ARM_SVE) != 0)
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# endif
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# elif defined (__sparc__)
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# define HAVE_FPU 1
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# elif defined (__mips_hard_float)
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# define HAVE_FPU 1
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# elif defined (__riscv)
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# ifdef __riscv_flen
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# define HAVE_FPU 1
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# endif
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# define VLC_CPU_RV_V 0x1
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# ifdef __riscv_v
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# define vlc_CPU_RV_V() (1)
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# else
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# define vlc_CPU_RV_V() ((vlc_CPU() & VLC_CPU_RV_V) != 0)
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# endif
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# else
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/**
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* Are single precision floating point operations "fast"?
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* If this preprocessor constant is zero, floating point should be avoided
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* (especially relevant for audio codecs).
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*/
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# define HAVE_FPU 0
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# endif
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/**
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* Initialises DSP functions.
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*
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* This helper looks for accelerated Digital Signal Processing functions
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* identified by the supplied type name. Those functions ares typically
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* implemented using architecture-specific assembler code with
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* Single Instruction Multiple Data (SIMD) opcodes for faster processing.
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*
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* The exact purposes and semantics of the DSP functions is uniquely identified
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* by a nul-terminated string.
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*
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* \note This function should not be used directly. It is recommended to use
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* the convenience wrapper vlc_CPU_functions_init_once() instead.
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*
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* \param name nul-terminated type identifier (cannot be NULL)
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* \param [inout] funcs type-specific data structure to be initialised
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*/
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VLC_API void vlc_CPU_functions_init(const char *name, void *restrict funcs);
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# ifndef __cplusplus
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/**
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* Initialises DSP functions once.
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*
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* This is a convenience wrapper for vlc_CPU_functions_init().
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* It only initialises the functions the first time it is evaluated.
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*/
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static inline void vlc_CPU_functions_init_once(const char *name,
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void *restrict funcs)
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{
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static vlc_once_t once = VLC_STATIC_ONCE;
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if (!vlc_once_begin(&once)) {
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vlc_CPU_functions_init(name, funcs);
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vlc_once_complete(&once);
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}
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}
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# endif
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#define set_cpu_funcs(name, activate, priority) \
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set_callback(VLC_CHECKED_TYPE(void (*)(void *), activate)) \
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set_capability(name, priority)
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#endif /* !VLC_CPU_H */
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