#optimization

You can see the dependency chain without running anything

Before reaching for a profiler, read what the compiler already produced. Two loops that add the same floats compile to eight adds into one register versus four independent accumulators, and llvm-mca will predict the throughput difference from that assembly without executing a single instruction. Episode 4 of the verification series.

• #performance
• #assembly
• #llvm-mca
• #optimization