diff options
Diffstat (limited to 'libavutil/x86/intmath.h')
| -rw-r--r-- | libavutil/x86/intmath.h | 58 |
1 files changed, 58 insertions, 0 deletions
diff --git a/libavutil/x86/intmath.h b/libavutil/x86/intmath.h new file mode 100644 index 0000000000..c42fa8352b --- /dev/null +++ b/libavutil/x86/intmath.h @@ -0,0 +1,58 @@ +/* + * Copyright (c) 2015 James Almer + * + * 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_X86_INTMATH_H +#define AVUTIL_X86_INTMATH_H + +#include <stdint.h> +#include "config.h" + +#if defined(__GNUC__) + +/* Our generic version of av_popcount is faster than GCC's built-in on + * CPUs that don't support the popcnt instruction. + */ +#if defined(__POPCNT__) + #define av_popcount __builtin_popcount +#if ARCH_X86_64 + #define av_popcount64 __builtin_popcountll +#endif + +#endif /* __POPCNT__ */ + +#if defined(__BMI2__) + +#define av_mod_uintp2 av_mod_uintp2_bmi2 +static av_always_inline av_const unsigned av_mod_uintp2_bmi2(unsigned a, unsigned p) +{ + if (av_builtin_constant_p(p)) + return a & ((1 << p) - 1); + else { + unsigned x; + __asm__ ("bzhi %2, %1, %0 \n\t" : "=r"(x) : "rm"(a), "r"(p)); + return x; + } +} + +#endif /* __BMI2__ */ + +#endif /* __GNUC__ */ + +#endif /* AVUTIL_X86_INTMATH_H */ |