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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.
45 lines
1.8 KiB
C
45 lines
1.8 KiB
C
/*
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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_ARM_CPU_H
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#define AVUTIL_ARM_CPU_H
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#include "config.h"
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#include "libavutil/cpu.h"
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#include "libavutil/cpu_internal.h"
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#define have_armv5te(flags) CPUEXT(flags, ARMV5TE)
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#define have_armv6(flags) CPUEXT(flags, ARMV6)
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#define have_armv6t2(flags) CPUEXT(flags, ARMV6T2)
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#define have_vfp(flags) CPUEXT(flags, VFP)
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#define have_vfpv3(flags) CPUEXT(flags, VFPV3)
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#define have_neon(flags) CPUEXT(flags, NEON)
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/* some functions use the VFPv2 vector mode which is deprecated in ARMv7-A
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* and might trap on such CPU depending on the OS configuration */
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#define have_vfp_vm(flags) \
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(have_armv6(flags) && ((flags) & AV_CPU_FLAG_VFP_VM))
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/* Some functions use the 'setend' instruction which is deprecated on ARMv8
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* and serializing on some ARMv7 cores. This macro ensures such functions
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* are only enabled on ARMv6. */
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#define have_setend(flags) \
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(have_armv6(flags) && !(have_vfpv3(flags) || have_neon(flags)))
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#endif /* AVUTIL_ARM_CPU_H */
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