/* * 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 <stdlib.h> #if HAVE_FAST_CLZ #if defined(_MSC_VER) #include <intrin.h> #elif defined(__INTEL_COMPILER) #include <immintrin.h> #endif #endif #include "config.h" #if HAVE_FAST_CLZ #if (defined(__INTEL_COMPILER) && (__INTEL_COMPILER>=1216)) || defined(_MSC_VER) # if defined(__INTEL_COMPILER) # define ff_log2(x) (_bit_scan_reverse((x)|1)) # else # define ff_log2 ff_log2_x86 static av_always_inline av_const int ff_log2_x86(unsigned int v) { unsigned long n; _BitScanReverse(&n, v|1); return n; } # endif # define ff_log2_16bit av_log2 # define ff_ctz(v) _tzcnt_u32(v) # if ARCH_X86_64 # define ff_ctzll(v) _tzcnt_u64(v) # else # define ff_ctzll ff_ctzll_x86 static av_always_inline av_const int ff_ctzll_x86(long long v) { return ((uint32_t)v == 0) ? _tzcnt_u32((uint32_t)(v >> 32)) + 32 : _tzcnt_u32((uint32_t)v); } # endif #endif /* __INTEL_COMPILER */ #endif /* HAVE_FAST_CLZ */ #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__ */ #if defined(__SSE2__) #define av_clipd av_clipd_sse2 static av_always_inline av_const double av_clipd_sse2(double a, double amin, double amax) { #if defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2 if (amin > amax) abort(); #endif __asm__ ("minsd %2, %0 \n\t" "maxsd %1, %0 \n\t" : "+&x"(a) : "xm"(amin), "xm"(amax)); return a; } #endif /* __SSE2__ */ #if defined(__SSE__) #define av_clipf av_clipf_sse static av_always_inline av_const float av_clipf_sse(float a, float amin, float amax) { #if defined(ASSERT_LEVEL) && ASSERT_LEVEL >= 2 if (amin > amax) abort(); #endif __asm__ ("minss %2, %0 \n\t" "maxss %1, %0 \n\t" : "+&x"(a) : "xm"(amin), "xm"(amax)); return a; } #endif /* __SSE__ */ #endif /* __GNUC__ */ #endif /* AVUTIL_X86_INTMATH_H */