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e2710e790c
The vector mode was deprecated in ARMv7-A/VFPv3 and various cpu implementations do not support it in hardware. Vector mode code will depending the OS either be emulated in software or result in an illegal instruction on cpus which does not support it. This was not really problem in practice since NEON implementations of the same functions are preferred. It will however become a problem for checkasm which tests every cpu flag separately. Since this is a cpu feature newer cpu do not support anymore the behaviour of this flag differs from the other flags. It can be only activated by runtime cpu feature selection.
93 lines
3.9 KiB
C
93 lines
3.9 KiB
C
/*
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* Copyright (c) 2000, 2001, 2002 Fabrice Bellard
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*
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* This file is part of Libav.
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*
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* Libav is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* Libav 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 GNU
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* 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
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* License along with Libav; if not, write to the Free Software
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* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
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*/
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#ifndef AVUTIL_CPU_H
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#define AVUTIL_CPU_H
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#include "version.h"
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#define AV_CPU_FLAG_FORCE 0x80000000 /* force usage of selected flags (OR) */
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/* lower 16 bits - CPU features */
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#define AV_CPU_FLAG_MMX 0x0001 ///< standard MMX
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#define AV_CPU_FLAG_MMXEXT 0x0002 ///< SSE integer functions or AMD MMX ext
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#define AV_CPU_FLAG_3DNOW 0x0004 ///< AMD 3DNOW
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#define AV_CPU_FLAG_SSE 0x0008 ///< SSE functions
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#define AV_CPU_FLAG_SSE2 0x0010 ///< PIV SSE2 functions
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#define AV_CPU_FLAG_SSE2SLOW 0x40000000 ///< SSE2 supported, but usually not faster
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///< than regular MMX/SSE (e.g. Core1)
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#define AV_CPU_FLAG_3DNOWEXT 0x0020 ///< AMD 3DNowExt
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#define AV_CPU_FLAG_SSE3 0x0040 ///< Prescott SSE3 functions
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#define AV_CPU_FLAG_SSE3SLOW 0x20000000 ///< SSE3 supported, but usually not faster
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///< than regular MMX/SSE (e.g. Core1)
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#define AV_CPU_FLAG_SSSE3 0x0080 ///< Conroe SSSE3 functions
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#define AV_CPU_FLAG_ATOM 0x10000000 ///< Atom processor, some SSSE3 instructions are slower
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#define AV_CPU_FLAG_SSE4 0x0100 ///< Penryn SSE4.1 functions
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#define AV_CPU_FLAG_SSE42 0x0200 ///< Nehalem SSE4.2 functions
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#define AV_CPU_FLAG_AVX 0x4000 ///< AVX functions: requires OS support even if YMM registers aren't used
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#define AV_CPU_FLAG_AVXSLOW 0x8000000 ///< AVX supported, but slow when using YMM registers (e.g. Bulldozer)
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#define AV_CPU_FLAG_XOP 0x0400 ///< Bulldozer XOP functions
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#define AV_CPU_FLAG_FMA4 0x0800 ///< Bulldozer FMA4 functions
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#define AV_CPU_FLAG_CMOV 0x1000 ///< i686 cmov
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#define AV_CPU_FLAG_AVX2 0x8000 ///< AVX2 functions: requires OS support even if YMM registers aren't used
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#define AV_CPU_FLAG_FMA3 0x10000 ///< Haswell FMA3 functions
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#define AV_CPU_FLAG_BMI1 0x20000 ///< Bit Manipulation Instruction Set 1
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#define AV_CPU_FLAG_BMI2 0x40000 ///< Bit Manipulation Instruction Set 2
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#define AV_CPU_FLAG_ALTIVEC 0x0001 ///< standard
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#define AV_CPU_FLAG_VSX 0x0002 ///< ISA 2.06
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#define AV_CPU_FLAG_POWER8 0x0004 ///< ISA 2.07
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#define AV_CPU_FLAG_ARMV5TE (1 << 0)
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#define AV_CPU_FLAG_ARMV6 (1 << 1)
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#define AV_CPU_FLAG_ARMV6T2 (1 << 2)
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#define AV_CPU_FLAG_VFP (1 << 3)
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#define AV_CPU_FLAG_VFPV3 (1 << 4)
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#define AV_CPU_FLAG_NEON (1 << 5)
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#define AV_CPU_FLAG_ARMV8 (1 << 6)
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#define AV_CPU_FLAG_VFP_VM (1 << 7) ///< VFPv2 vector mode, deprecated in ARMv7-A and unavailable in various CPUs implementations
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/**
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* Return the flags which specify extensions supported by the CPU.
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*/
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int av_get_cpu_flags(void);
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/**
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* Set a mask on flags returned by av_get_cpu_flags().
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* This function is mainly useful for testing.
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*
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* @warning this function is not thread safe.
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*/
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void av_set_cpu_flags_mask(int mask);
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/**
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* Parse CPU flags from a string.
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*
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* @return a combination of AV_CPU_* flags, negative on error.
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*/
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int av_parse_cpu_flags(const char *s);
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/**
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* @return the number of logical CPU cores present.
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*/
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int av_cpu_count(void);
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#endif /* AVUTIL_CPU_H */
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