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55200f999c
If Zbb is enabled at compilation (e.g. Ubuntu), the compiler should compile the new C mid_pred() function correctly. But if Zbb is *not* enabled (e.g. Debian), then we can at least fallback at run-time. On SiFive-U74, before: sub_median_pred_c: 1331.9 ( 1.00x) sub_median_pred_rvb_b: 881.8 ( 1.51x) After: sub_median_pred_c: 1133.1 ( 1.00x) sub_median_pred_rvb_b: 875.7 ( 1.29x)
55 lines
1.6 KiB
C
55 lines
1.6 KiB
C
/*
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* Copyright © 2025 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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#ifndef AVCODEC_RISCV_MATHOPS_H
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#define AVCODEC_RISCV_MATHOPS_H
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#include "config.h"
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#include <stdbool.h>
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#include "libavutil/attributes_internal.h"
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#include "libavutil/riscv/cpu.h"
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#if HAVE_RV && !defined(__riscv_zbb)
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static inline int median3_c(int a, int b, int c);
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static inline av_const int median3_rv(int a, int b, int c)
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{
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if (__builtin_expect(ff_rv_zbb_support(), true)) {
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int min2, max2;
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__asm__ (
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".option push\n"
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".option arch, +zbb\n"
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"max %1, %2, %3\n"
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"min %0, %2, %3\n"
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"min %1, %4, %1\n"
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"max %0, %0, %1\n"
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".option pop\n"
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: "=&r" (min2), "=&r" (max2) : "r" (a), "r" (b), "r" (c));
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return min2;
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}
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return median3_c(a, b, c);
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}
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#define mid_pred median3_rv
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#endif
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#endif /* HAVE_RVV */
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