就开编译器后门，让编译器来实现。交给编译器就可以针对特定的硬件指令集优化，比如这个popcount函数，在x...
这是C++11没关系，这和C++也没关系，这甚至和标准C都没关系。这是只是一个gcc内建的函数，没有可...
intn =15;//二进制为1111cout<<__builtin_popcount(n)<<endl;//输出4 2.__builtin_parity(n) 该函数是判断n的二进制中1的个数的奇偶性 intn =15;//二进制为1111intm =7;//111cout<<__builtin_parity(n)<<endl;//偶数个,输出0cout<<__builtin_parity(m)<<endl;//奇数个,输出1 3.__bu...
Abhitator216 3 years ago,#| -13 what is the time complexity of __builtin_popcount() which is used as cpp inbuilt function →Reply sahaun 3 years ago,#^| 0 Related blog post: Is __builtin_popcount O(1) or O(log_2 k) ? →Reply...
This replaces all occurrences of the BitCount8 static array with the __builtin_popcount. It is a rather simple and small PR. Fixes #308. chore: __builtin_popcount to replace BitCount8 … fe3b5bf Contributor alanminko commented Jul 24, 2024 Unfortunately there is a problem with the ...
给定一个非负整数 num。对于 0 ≤ i ≤ num 范围中的每个数字 i ，计算其二进制数中的 1 的数目...
# __builtin_popcountll # __builtin_powi # __builtin_powif # __builtin_powil # __builtin_prefetch # __builtin_trap # __builtin_types_compatible_p # __builtin_unreachable # # Unsuppored built-ins will be tested with an empty parameter set and the # result of the check might...
result +=__builtin_popcountll(_mm256_extract_epi64(merged,3)); ptr +=8*32; }returnresult + scalar_count_bytes(ptr, end - ptr, byte); } 开发者ID:WojciechMula,项目名称:toys,代码行数:49,代码来源:avx2.cpp 示例4: rankbv_rank1 ...
intget_array_position_malloc(unsignedintnum_dwords){if(num_dwords > INITIAL_HEAP_SIZE)returnFREE_LIST_SIZE -1;// last element of the free list is reserved for blocks larger than 512 dwordsunsignedintnum_set_bits =__builtin_popcount(num_dwords);if(num_set_bits >1) {// not a power of...
谁让有条指令叫POPCNT呢