<ul><li>SSE (Streaming SIMD Extensions) and AVX (Advanced Vector Extensions) are instruction sets that allow processors to perform the same operation on multiple data points simultaneously.</li><li>Auto-vectorization in modern compilers automatically generates SIMD instructions based on the code analysis, simplifying optimization process and focusing on high-level logic.</li><li>Enabling auto-vectorization requires specific compiler flags, such as -O3 -march=native or -ffast-math, to optimize the code aggressively.</li><li>In cases where auto-vectorization fails or produces suboptimal results, manual vectorization using intrinsics can provide precise control over SIMD instructions.</li></ul>

Why won’t simple code get auto-vectorized with SSE and AVX in modern compilers?

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