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/*
* Copyright © 2022-2024 Rémi Denis-Courmont.
*
* This file is part of FFmpeg.
*
* FFmpeg is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation; either
* version 2.1 of the License, or (at your option) any later version.
*
* FFmpeg is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*
* You should have received a copy of the GNU Lesser General Public
* License along with FFmpeg; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef AVUTIL_RISCV_INTMATH_H
#define AVUTIL_RISCV_INTMATH_H
#include <stdint.h>
#include "config.h"
#include "libavutil/attributes.h"
#include "libavutil/riscv/cpu.h"
/*
* The compiler is forced to sign-extend the result anyhow, so it is faster to
* compute it explicitly and use it.
*/
#define av_clip_int8 av_clip_int8_rvi
static av_always_inline av_const int8_t av_clip_int8_rvi(int a)
{
union { uint8_t u; int8_t s; } u = { .u = a };
if (a != u.s)
a = ((a >> 31) ^ 0x7F);
return a;
}
#define av_clip_int16 av_clip_int16_rvi
static av_always_inline av_const int16_t av_clip_int16_rvi(int a)
{
union { uint16_t u; int16_t s; } u = { .u = a };
if (a != u.s)
a = ((a >> 31) ^ 0x7FFF);
return a;
}
#define av_clipl_int32 av_clipl_int32_rvi
static av_always_inline av_const int32_t av_clipl_int32_rvi(int64_t a)
{
union { uint32_t u; int32_t s; } u = { .u = a };
if (a != u.s)
a = ((a >> 63) ^ 0x7FFFFFFF);
return a;
}
#define av_clip_intp2 av_clip_intp2_rvi
static av_always_inline av_const int av_clip_intp2_rvi(int a, int p)
{
const int shift = 31 - p;
int b = ((int)(((unsigned)a) << shift)) >> shift;
if (a != b)
b = (a >> 31) ^ ((1 << p) - 1);
return b;
}
#if defined (__GNUC__) || defined (__clang__)
static inline av_const int ff_ctz_rv(int x)
{
#if HAVE_RV && !defined(__riscv_zbb)
if (!__builtin_constant_p(x) &&
__builtin_expect(ff_rv_zbb_support(), true)) {
int y;
__asm__ (
".option push\n"
".option arch, +zbb\n"
#if __riscv_xlen >= 64
"ctzw %0, %1\n"
#else
"ctz %0, %1\n"
#endif
".option pop" : "=r" (y) : "r" (x));
if (y > 32)
__builtin_unreachable();
return y;
}
#endif
return __builtin_ctz(x);
}
#define ff_ctz ff_ctz_rv
static inline av_const int ff_ctzll_rv(long long x)
{
#if HAVE_RV && !defined(__riscv_zbb) && __riscv_xlen == 64
if (!__builtin_constant_p(x) &&
__builtin_expect(ff_rv_zbb_support(), true)) {
int y;
__asm__ (
".option push\n"
".option arch, +zbb\n"
"ctz %0, %1\n"
".option pop" : "=r" (y) : "r" (x));
if (y > 64)
__builtin_unreachable();
return y;
}
#endif
return __builtin_ctzll(x);
}
#define ff_ctzll ff_ctzll_rv
static inline av_const int ff_clz_rv(int x)
{
#if HAVE_RV && !defined(__riscv_zbb)
if (!__builtin_constant_p(x) &&
__builtin_expect(ff_rv_zbb_support(), true)) {
int y;
__asm__ (
".option push\n"
".option arch, +zbb\n"
#if __riscv_xlen >= 64
"clzw %0, %1\n"
#else
"clz %0, %1\n"
#endif
".option pop" : "=r" (y) : "r" (x));
if (y > 32)
__builtin_unreachable();
return y;
}
#endif
return __builtin_clz(x);
}
#define ff_clz ff_clz_rv
#if __riscv_xlen == 64
static inline av_const int ff_clzll_rv(long long x)
{
#if HAVE_RV && !defined(__riscv_zbb)
if (!__builtin_constant_p(x) &&
__builtin_expect(ff_rv_zbb_support(), true)) {
int y;
__asm__ (
".option push\n"
".option arch, +zbb\n"
"clz %0, %1\n"
".option pop" : "=r" (y) : "r" (x));
if (y > 64)
__builtin_unreachable();
return y;
}
#endif
return __builtin_clzll(x);
}
#define ff_clz ff_clz_rv
#endif
static inline av_const int ff_log2_rv(unsigned int x)
{
return 31 - ff_clz_rv(x | 1);
}
#define ff_log2 ff_log2_rv
#define ff_log2_16bit ff_log2_rv
static inline av_const int av_popcount_rv(unsigned int x)
{
#if HAVE_RV && !defined(__riscv_zbb)
if (!__builtin_constant_p(x) &&
__builtin_expect(ff_rv_zbb_support(), true)) {
int y;
__asm__ (
".option push\n"
".option arch, +zbb\n"
#if __riscv_xlen >= 64
"cpopw %0, %1\n"
#else
"cpop %0, %1\n"
#endif
".option pop" : "=r" (y) : "r" (x));
if (y > 32)
__builtin_unreachable();
return y;
}
#endif
return __builtin_popcount(x);
}
#define av_popcount av_popcount_rv
static inline av_const int av_popcount64_rv(uint64_t x)
{
#if HAVE_RV && !defined(__riscv_zbb) && __riscv_xlen >= 64
if (!__builtin_constant_p(x) &&
__builtin_expect(ff_rv_zbb_support(), true)) {
int y;
__asm__ (
".option push\n"
".option arch, +zbb\n"
"cpop %0, %1\n"
".option pop" : "=r" (y) : "r" (x));
if (y > 64)
__builtin_unreachable();
return y;
}
#endif
return __builtin_popcountl(x);
}
#define av_popcount64 av_popcount64_rv
static inline av_const int av_parity_rv(unsigned int x)
{
#if HAVE_RV && !defined(__riscv_zbb)
if (!__builtin_constant_p(x) &&
__builtin_expect(ff_rv_zbb_support(), true)) {
int y;
__asm__ (
".option push\n"
".option arch, +zbb\n"
#if __riscv_xlen >= 64
"cpopw %0, %1\n"
#else
"cpop %0, %1\n"
#endif
".option pop" : "=r" (y) : "r" (x));
return y & 1;
}
#endif
return __builtin_parity(x);
}
#define av_parity av_parity_rv
#endif
#endif /* AVUTIL_RISCV_INTMATH_H */
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