mirror of
https://github.com/FFmpeg/FFmpeg.git
synced 2024-12-02 03:06:28 +02:00
0e580806d8
As with the earlier bswap change, all versions of GCC and Clang that support RISC-V support the popcount built-ins, so we can just use them instead of inline assembler.
82 lines
2.2 KiB
C
82 lines
2.2 KiB
C
/*
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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 AVUTIL_RISCV_INTMATH_H
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#define AVUTIL_RISCV_INTMATH_H
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#include <stdint.h>
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#include "config.h"
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#include "libavutil/attributes.h"
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/*
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* The compiler is forced to sign-extend the result anyhow, so it is faster to
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* compute it explicitly and use it.
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*/
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#define av_clip_int8 av_clip_int8_rvi
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static av_always_inline av_const int8_t av_clip_int8_rvi(int a)
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{
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union { uint8_t u; int8_t s; } u = { .u = a };
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if (a != u.s)
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a = ((a >> 31) ^ 0x7F);
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return a;
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}
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#define av_clip_int16 av_clip_int16_rvi
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static av_always_inline av_const int16_t av_clip_int16_rvi(int a)
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{
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union { uint16_t u; int16_t s; } u = { .u = a };
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if (a != u.s)
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a = ((a >> 31) ^ 0x7FFF);
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return a;
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}
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#define av_clipl_int32 av_clipl_int32_rvi
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static av_always_inline av_const int32_t av_clipl_int32_rvi(int64_t a)
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{
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union { uint32_t u; int32_t s; } u = { .u = a };
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if (a != u.s)
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a = ((a >> 63) ^ 0x7FFFFFFF);
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return a;
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}
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#define av_clip_intp2 av_clip_intp2_rvi
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static av_always_inline av_const int av_clip_intp2_rvi(int a, int p)
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{
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const int shift = 31 - p;
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int b = ((int)(((unsigned)a) << shift)) >> shift;
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if (a != b)
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b = (a >> 31) ^ ((1 << p) - 1);
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return b;
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}
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#if defined (__GNUC__) || defined (__clang__)
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#define av_popcount __builtin_popcount
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#if (__riscv_xlen >= 64)
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#define av_popcount64 __builtin_popcountl
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#else
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#define av_popcount64 __builtin_popcountll
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#endif
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#endif
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#endif /* AVUTIL_RISCV_INTMATH_H */
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