derwind https://blog.hatena.ne.jp/derwind/ らんだむな記憶 https://randommemory.hatenablog.com/ C/C++ #include <cstdio> constexpr int num(int a = 1) { if ( a == 1 ) { return 314; } else { return 271; } } int main(void) { char buf[ num(1) ]; printf("%lu\n", sizeof(buf)); return 0; } こんなの書いて、 $ clang++ -O3 -S -o main.s -std=c++14 main.cpp してみると、 .section __TEXT,__text,regular,pure_instructions .macosx… 190 <iframe src="https://hatenablog-parts.com/embed?url=https%3A%2F%2Frandommemory.hatenablog.com%2Fentry%2F2017%2F02%2F04%2F201510" title="constexpr - らんだむな記憶" class="embed-card embed-blogcard" scrolling="no" frameborder="0" style="display: block; width: 100%; height: 190px; max-width: 500px; margin: 10px 0px;"></iframe> Hatena Blog https://hatena.blog 2017-02-04 20:15:10 rich https://randommemory.hatenablog.com/entry/2017/02/04/201510 1.0 100%