我知道主函数里，int能用register加速。
by 休止 @ 2018-08-08 18:35:24
哦,谢了大佬,能具体说一下用法吗?
by GKE心林电 @ 2018-08-08 18:36:09
就是register int就可以了啊，其他我也不会了，问其他人吧。
by 休止 @ 2018-08-08 18:37:02
拿走不谢
```
#pragma GCC optimize(2)
#pragma GCC optimize(3)
#pragma GCC optimize("Ofast")
#pragma GCC optimize("inline")
#pragma GCC optimize("-fgcse")
#pragma GCC optimize("-fgcse-lm")
#pragma GCC optimize("-fipa-sra")
#pragma GCC optimize("-ftree-pre")
#pragma GCC optimize("-ftree-vrp")
#pragma GCC optimize("-fpeephole2")
#pragma GCC optimize("-ffast-math")
#pragma GCC optimize("-fsched-spec")
#pragma GCC optimize("unroll-loops")
#pragma GCC optimize("-falign-jumps")
#pragma GCC optimize("-falign-loops")
#pragma GCC optimize("-falign-labels")
#pragma GCC optimize("-fdevirtualize")
#pragma GCC optimize("-fcaller-saves")
#pragma GCC optimize("-fcrossjumping")
#pragma GCC optimize("-fthread-jumps")
#pragma GCC optimize("-funroll-loops")
#pragma GCC optimize("-fwhole-program")
#pragma GCC optimize("-freorder-blocks")
#pragma GCC optimize("-fschedule-insns")
#pragma GCC optimize("inline-functions")
#pragma GCC optimize("-ftree-tail-merge")
#pragma GCC optimize("-fschedule-insns2")
#pragma GCC optimize("-fstrict-aliasing")
#pragma GCC optimize("-fstrict-overflow")
#pragma GCC optimize("-falign-functions")
#pragma GCC optimize("-fcse-skip-blocks")
#pragma GCC optimize("-fcse-follow-jumps")
#pragma GCC optimize("-fsched-interblock")
#pragma GCC optimize("-fpartial-inlining")
#pragma GCC optimize("no-stack-protector")
#pragma GCC optimize("-freorder-functions")
#pragma GCC optimize("-findirect-inlining")
#pragma GCC optimize("-fhoist-adjacent-loads")
#pragma GCC optimize("-frerun-cse-after-loop")
#pragma GCC optimize("inline-small-functions")
#pragma GCC optimize("-finline-small-functions")
#pragma GCC optimize("-ftree-switch-conversion")
#pragma GCC optimize("-foptimize-sibling-calls")
#pragma GCC optimize("-fexpensive-optimizations")
#pragma GCC optimize("-funsafe-loop-optimizations")
#pragma GCC optimize("inline-functions-called-once")
#pragma GCC optimize("-fdelete-null-pointer-checks")
```
by XiaoX @ 2018-08-08 18:37:04
就是register int就可以了啊，其他我也不会了，问其他人吧。
by 休止 @ 2018-08-08 18:37:13
谢谢大佬
by GKE心林电 @ 2018-08-08 18:37:31
跪拜
by GKE心林电 @ 2018-08-08 18:37:41
@[XiaoX](/space/show?uid=61309) 这些什么意思？有什么用?
by yzx72424 @ 2018-08-08 18:37:43
``` cpp
extern __inline__ __attribute__ ((always_inline))
```
部分情况可用，优于$inline$
by Juanzhang @ 2018-08-08 18:38:56
快读，快写，搜索剪枝，位运算
by Delta_Rain @ 2018-08-08 18:38:57