| /* |
| * 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__) |
| |
| #if AV_GCC_VERSION_AT_LEAST(5,1) |
| #define av_mod_uintp2 __builtin_ia32_bzhi_si |
| #elif HAVE_INLINE_ASM |
| /* GCC releases before 5.1.0 have a broken bzhi builtin, so for those we |
| * implement it using inline assembly |
| */ |
| #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 /* AV_GCC_VERSION_AT_LEAST */ |
| |
| #endif /* __BMI2__ */ |
| |
| #endif /* __GNUC__ */ |
| |
| #endif /* AVUTIL_X86_INTMATH_H */ |