104 lines
2.7 KiB
C
104 lines
2.7 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 { 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_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 = 32 - p;
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int b = (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 (__riscv_zbb) && (__riscv_zbb > 0) && HAVE_INLINE_ASM
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#define av_popcount av_popcount_rvb
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static av_always_inline av_const int av_popcount_rvb(uint32_t x)
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{
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int ret;
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#if (__riscv_xlen >= 64)
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__asm__ ("cpopw %0, %1\n" : "=r" (ret) : "r" (x));
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#else
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__asm__ ("cpop %0, %1\n" : "=r" (ret) : "r" (x));
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#endif
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return ret;
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}
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#if (__riscv_xlen >= 64)
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#define av_popcount64 av_popcount64_rvb
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static av_always_inline av_const int av_popcount64_rvb(uint64_t x)
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{
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int ret;
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#if (__riscv_xlen >= 128)
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__asm__ ("cpopd %0, %1\n" : "=r" (ret) : "r" (x));
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#else
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__asm__ ("cpop %0, %1\n" : "=r" (ret) : "r" (x));
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#endif
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return ret;
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}
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#endif /* __riscv_xlen >= 64 */
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#endif /* __riscv_zbb */
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#endif /* AVUTIL_RISCV_INTMATH_H */
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