Vector reductions explained
Horizontal operations, floating-point reassociation and the cost of the final combine.
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Auto-Vectorization
Memory Aliasing and Vectorization
When two pointers may refer to overlapping storage, a compiler can be forced to preserve scalar ordering. Learn how alias analysis, restrict and runtime checks affect vectorization.
Loop-Carried Dependencies Explained
A loop-carried dependency connects one iteration to another. It is one of the most important reasons a loop cannot be executed or vectorized as independent iterations.
Why Compilers Fail to Vectorize Loops
Compilers skip vectorization when legality, profitability or target constraints get in the way. Learn the most common blockers: dependencies, aliasing, control flow, calls and memory access.