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The simd_mask type enables conditional execution of operations on SIMD vectors in C++. It works with the where expression to selectively apply operations to vector elements based on boolean conditions. The mask contains truth values corresponding to each SIMD vector element, allowing for efficient conditional processing. Examples demonstrate creating masks from predicates and using them to conditionally modify vector elements, such as computing absolute values by negating only negative elements.

Data-Parallel Types: simd_mask – MC++ BLOG