(GCC) C++代码中使用#pragma GCC optimize / #pragma G++ optimize

科学计算用优化

经过实验证明这个命令优化效果最好，把我的 1.2S 的 FFT 优化到了 0.4S使用 pragma 命令优化程序：

#pragma GCC optimize("Ofast,no-stack-protector")

实用优化项：

#pragma GCC optimize("Ofast")

#pragma GCC target("sse3","sse2","sse")

#pragma GCC target("avx","sse4","sse4.1","sse4.2","ssse3")

#pragma GCC target("f16c")

#pragma GCC optimize("inline","fast-math","unroll-loops","no-stack-protector")

#pragma GCC diagnostic error "-fwhole-program"

#pragma GCC diagnostic error "-fcse-skip-blocks"

#pragma GCC diagnostic error "-funsafe-loop-optimizations"

#pragma GCC diagnostic error "-std=c++14"

ref:

[Tutorial] GCC Optimization Pragmas

优化项列表

#pragma GCC optimize(1)

#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("-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")

#pragma G++ optimize(1)

#pragma G++ optimize(2)

#pragma G++ optimize(3)

#pragma G++ optimize("Ofast")

#pragma G++ optimize("inline")

#pragma G++ optimize("-fgcse")

#pragma G++ optimize("-fgcse-lm")

#pragma G++ optimize("-fipa-sra")

#pragma G++ optimize("-ftree-pre")

#pragma G++ optimize("-ftree-vrp")

#pragma G++ optimize("-fpeephole2")

#pragma G++ optimize("-ffast-math")

#pragma G++ optimize("-fsched-spec")

#pragma G++ optimize("unroll-loops")

#pragma G++ optimize("-falign-jumps")

#pragma G++ optimize("-falign-loops")

#pragma G++ optimize("-falign-labels")

#pragma G++ optimize("-fdevirtualize")

#pragma G++ optimize("-fcaller-saves")

#pragma G++ optimize("-fcrossjumping")

#pragma G++ optimize("-fthread-jumps")

#pragma G++ optimize("-funroll-loops")

#pragma G++ optimize("-fwhole-program")

#pragma G++ optimize("-freorder-blocks")

#pragma G++ optimize("-fschedule-insns")

#pragma G++ optimize("inline-functions")

#pragma G++ optimize("-ftree-tail-merge")

#pragma G++ optimize("-fschedule-insns2")

#pragma G++ optimize("-fstrict-aliasing")

#pragma G++ optimize("-fstrict-overflow")

#pragma G++ optimize("-falign-functions")

#pragma G++ optimize("-fcse-skip-blocks")

#pragma G++ optimize("-fcse-follow-jumps")

#pragma G++ optimize("-fsched-interblock")

#pragma G++ optimize("-fpartial-inlining")

#pragma G++ optimize("no-stack-protector")

#pragma G++ optimize("-freorder-functions")

#pragma G++ optimize("-findirect-inlining")

#pragma G++ optimize("-frerun-cse-after-loop")

#pragma G++ optimize("inline-small-functions")

#pragma G++ optimize("-finline-small-functions")

#pragma G++ optimize("-ftree-switch-conversion")

#pragma G++ optimize("-foptimize-sibling-calls")

#pragma G++ optimize("-fexpensive-optimizations")

#pragma G++ optimize("-funsafe-loop-optimizations")

#pragma G++ optimize("inline-functions-called-once")

#pragma G++ optimize("-fdelete-null-pointer-checks")

(GCC) C++代码中使用#pragma GCC optimize / #pragma G++ optimize的相关教程结束。