Light_az @ 2024-11-28 19:09:17
Rt ,网上找到的断断续续，没有全面介绍的，Cu
by xiezheyuan @ 2024-11-28 19:42:51
@CodingOIer 我好像就是GCC 9 哈
xiezheyuan ➜ ~ $ g++ --version
g++ (Ubuntu 9.4.0-1ubuntu1~20.04.2) 9.4.0
Copyright (C) 2019 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.
xiezheyuan ➜ ~ $ gcc --version
gcc (Ubuntu 9.4.0-1ubuntu1~20.04.2) 9.4.0
Copyright (C) 2019 Free Software Foundation, Inc.
This is free software; see the source for copying conditions. There is NO
warranty; not even for MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.by CodingOIer @ 2024-11-28 19:43:24
@xiezheyuan尽管不会炸也不建议使用 int128 像正常地类型一样用，毕竟不是标准里的东西
他告诉你 1 + 1 = 3 实际上也是符合 C++ 标准地
by CodingOIer @ 2024-11-28 19:43:57
@xiezheyuan我也没炸
by litjohn @ 2024-11-28 20:26:38
@CodingOIer 你会发现它的加法/位运算需要两条指令，乘法需要5条指令，除法需要7条指令
by CodingOIer @ 2024-11-28 20:28:02
@litjohn？没看懂
by litjohn @ 2024-11-28 20:29:49
@CodingOIer 观察汇编，发现在不用simd的情况下__int128的算术运算需要比 long long 更多的指令，时间常数会很大。
by CodingOIer @ 2024-11-28 20:31:12
@litjohn1，所以不建议使用