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Reblogged by cstanhope@social.coop ("Your friendly 'net denizen"):

joe@f.duriansoftware.com ("Joe Groff") wrote:

a while back, someone asked, "why isn't there a way in C to tell if my code is optimized?" thankfully, we can implement this as a library function

Attachments:

• #include <stdio.h> __attribute__((noinline)) bool is_optimized_impl(int *a, float *b) { *a = 0; *b = 1; return *a == 0; } bool is_optimized() { union { int a; float b; } u; return is_optimized_impl(&u.a, &u.b); } int main() { printf("i am %soptimized\n", is_optimized() ? "" : "not "); } (remote)