https://jasper-aa64.github.io/zh/tags/loop-optimization/Recent content in Loop-Optimization on JasperHugozh-CNMon, 12 Oct 2026 00:00:00 +0000https://jasper-aa64.github.io/zh/posts/loop-optimization/Mon, 12 Oct 2026 00:00:00 +0000https://jasper-aa64.github.io/zh/posts/loop-optimization/点积循环 -O3 报告“已向量化”，四个加法却还是一个等一个：浮点加法不满足结合律，编译器不敢换顺序。循环优化真正要你管的，是这类挡住编译器的地方，和它不会替你做的改动。