@[zhanghengrui](/user/110634) 以前曾经waiting了五分钟。。。
by zhaowangji @ 2020-02-24 22:14:11
@[zhanghengrui](/user/110634) 那个jmp,jne是什么意思?
by zhaowangji @ 2020-02-24 22:14:39
神奇的是我测出来反而if快。。。
by zhaowangji @ 2020-02-24 22:16:48
```cpp
#include<bits/stdc++.h>
#include<ctime>
using namespace std;
clock_t t1,t2;
long long ans;
int main(){
t1=clock();
for(int i=1;i<=1e9;++i){
if(i%7==0)continue;
else ++ans;
}
t2=clock();
cout<<(double)(t2-t1)/1000<<endl;
t1=clock();
for(int i=1;i<=1e9;++i){
if(i%7!=0){
++ans;
}
}
t2=clock();
cout<<(double)(t2-t1)/1000<<endl;
return 0;
}
```
by zhaowangji @ 2020-02-24 22:17:12
@[zhaowangji](/user/164840) 不会有多少差别的吧
评测鸡波动见识过就知道了咩
by hater @ 2020-02-24 22:17:37
@[hater](/user/100114) 这波动程度得是多厉害......
by zhaowangji @ 2020-02-24 22:18:25
@[zhaowangji](/user/164840) 实测 `continue` 快一点
![](https://s2.ax1x.com/2020/02/24/3J9Vq1.png)
不过其实还是不太严谨,毕竟 `==` 和 `!=` 效率不一定一样
by zhanghengrui @ 2020-02-24 23:16:32
@[zhanghengrui](/user/110634) 为什么我测if快。。。
你这编译器是怎么搞的?
by zhaowangji @ 2020-02-24 23:19:30
@[zhaowangji](/user/164840) Arch Linux,gcc 9.2.1
应该是官方的
by zhanghengrui @ 2020-02-24 23:20:08
@[zhaowangji](/user/164840)
`gcc -v` 输出
```plain
使用内建 specs。
COLLECT_GCC=gcc
COLLECT_LTO_WRAPPER=/usr/lib/gcc/x86_64-pc-linux-gnu/9.2.1/lto-wrapper
目标:x86_64-pc-linux-gnu
配置为:/build/gcc/src/gcc/configure --prefix=/usr --libdir=/usr/lib --libexecdir=/usr/lib --mandir=/usr/share/man --infodir=/usr/share/info --with-pkgversion='Arch Linux 9.2.1+20200130-2' --with-bugurl=https://bugs.archlinux.org/ --enable-languages=c,c++,ada,fortran,go,lto,objc,obj-c++,d --enable-shared --enable-threads=posix --with-system-zlib --with-isl --enable-__cxa_atexit --disable-libunwind-exceptions --enable-clocale=gnu --disable-libstdcxx-pch --disable-libssp --enable-gnu-unique-object --enable-linker-build-id --enable-lto --enable-plugin --enable-install-libiberty --with-linker-hash-style=gnu --enable-gnu-indirect-function --enable-multilib --disable-werror --enable-checking=release --enable-default-pie --enable-default-ssp --enable-cet=auto gdc_include_dir=/usr/include/dlang/gdc
线程模型:posix
gcc 版本 9.2.1 20200130 (Arch Linux 9.2.1+20200130-2)
```
by zhanghengrui @ 2020-02-24 23:22:02