g++优化开关（暴力必备）

 1 %:pragma GCC optimize(3)
 2 %:pragma GCC optimize("Ofast")
 3 %:pragma GCC optimize("inline")
 4 %:pragma GCC optimize("-fgcse")
 5 %:pragma GCC optimize("-fgcse-lm")
 6 %:pragma GCC optimize("-fipa-sra")
 7 %:pragma GCC optimize("-ftree-pre")
 8 %:pragma GCC optimize("-ftree-vrp")
 9 %:pragma GCC optimize("-fpeephole2")
10 %:pragma GCC optimize("-ffast-math")
11 %:pragma GCC optimize("-fsched-spec")
12 %:pragma GCC optimize("unroll-loops")
13 %:pragma GCC optimize("-falign-jumps")
14 %:pragma GCC optimize("-falign-loops")
15 %:pragma GCC optimize("-falign-labels")
16 %:pragma GCC optimize("-fdevirtualize")
17 %:pragma GCC optimize("-fcaller-saves")
18 %:pragma GCC optimize("-fcrossjumping")
19 %:pragma GCC optimize("-fthread-jumps")
20 %:pragma GCC optimize("-funroll-loops")
21 %:pragma GCC optimize("-fwhole-program")
22 %:pragma GCC optimize("-freorder-blocks")
23 %:pragma GCC optimize("-fschedule-insns")
24 %:pragma GCC optimize("inline-functions")
25 %:pragma GCC optimize("-ftree-tail-merge")
26 %:pragma GCC optimize("-fschedule-insns2")
27 %:pragma GCC optimize("-fstrict-aliasing")
28 %:pragma GCC optimize("-fstrict-overflow")
29 %:pragma GCC optimize("-falign-functions")
30 %:pragma GCC optimize("-fcse-skip-blocks")
31 %:pragma GCC optimize("-fcse-follow-jumps")
32 %:pragma GCC optimize("-fsched-interblock")
33 %:pragma GCC optimize("-fpartial-inlining")
34 %:pragma GCC optimize("no-stack-protector")
35 %:pragma GCC optimize("-freorder-functions")
36 %:pragma GCC optimize("-findirect-inlining")
37 %:pragma GCC optimize("-fhoist-adjacent-loads")
38 %:pragma GCC optimize("-frerun-cse-after-loop")
39 %:pragma GCC optimize("inline-small-functions")
40 %:pragma GCC optimize("-finline-small-functions")
41 %:pragma GCC optimize("-ftree-switch-conversion")
42 %:pragma GCC optimize("-foptimize-sibling-calls")
43 %:pragma GCC optimize("-fexpensive-optimizations")
44 %:pragma GCC optimize("-funsafe-loop-optimizations")
45 %:pragma GCC optimize("inline-functions-called-once")
46 %:pragma GCC optimize("-fdelete-null-pointer-checks")

真好。

标签：GCC,falign,++,必备,functions,ftree,开关,pragma,optimize
来源： https://www.cnblogs.com/huwenqiang-hwq/p/11281966.html