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81 lines
2.2 KiB
81 lines
2.2 KiB
/* |
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* Copyright © 2022 Rémi Denis-Courmont. |
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* |
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* This file is part of FFmpeg. |
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* |
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* FFmpeg 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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* FFmpeg 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 FFmpeg; 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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#include "libavutil/cpu.h" |
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#include "libavutil/cpu_internal.h" |
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#include "libavutil/log.h" |
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#include "config.h" |
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#if HAVE_GETAUXVAL |
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#include <sys/auxv.h> |
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#define HWCAP_RV(letter) (1ul << ((letter) - 'A')) |
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#endif |
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int ff_get_cpu_flags_riscv(void) |
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{ |
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int ret = 0; |
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#if HAVE_GETAUXVAL |
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const unsigned long hwcap = getauxval(AT_HWCAP); |
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if (hwcap & HWCAP_RV('I')) |
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ret |= AV_CPU_FLAG_RVI; |
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if (hwcap & HWCAP_RV('F')) |
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ret |= AV_CPU_FLAG_RVF; |
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if (hwcap & HWCAP_RV('D')) |
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ret |= AV_CPU_FLAG_RVD; |
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if (hwcap & HWCAP_RV('B')) |
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ret |= AV_CPU_FLAG_RVB_BASIC; |
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/* The V extension implies all Zve* functional subsets */ |
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if (hwcap & HWCAP_RV('V')) |
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ret |= AV_CPU_FLAG_RVV_I32 | AV_CPU_FLAG_RVV_I64 |
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| AV_CPU_FLAG_RVV_F32 | AV_CPU_FLAG_RVV_F64; |
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#endif |
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#ifdef __riscv_i |
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ret |= AV_CPU_FLAG_RVI; |
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#endif |
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#if defined (__riscv_flen) && (__riscv_flen >= 32) |
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ret |= AV_CPU_FLAG_RVF; |
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#if (__riscv_flen >= 64) |
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ret |= AV_CPU_FLAG_RVD; |
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#endif |
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#endif |
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#ifdef __riscv_zbb |
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ret |= AV_CPU_FLAG_RVB_BASIC; |
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#endif |
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/* If RV-V is enabled statically at compile-time, check the details. */ |
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#ifdef __riscv_vectors |
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ret |= AV_CPU_FLAG_RVV_I32; |
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#if __riscv_v_elen >= 64 |
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ret |= AV_CPU_FLAG_RVV_I64; |
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#endif |
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#if __riscv_v_elen_fp >= 32 |
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ret |= AV_CPU_FLAG_RVV_F32; |
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#if __riscv_v_elen_fp >= 64 |
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ret |= AV_CPU_FLAG_RVV_F64; |
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#endif |
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#endif |
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#endif |
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return ret; |
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}
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