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Line 54: * Programming with given SIMD instruction sets can involve many low-level challenges. # SIMD may have restrictions on [[Data structure alignment\|data alignment]]; programmers familiar with a given architecture may not expect this. Worse: the alignment may change from one revision or "compatible" processor to another. # Gathering data into SIMD registers and scattering it to the correct destination locations is tricky (sometimes requiring [[permute ~~instruction]]s~~instructions (operations) and can be inefficient. # Specific instructions like rotations or three-operand addition are not available in some SIMD instruction sets. # Instruction sets are architecture-specific: some processors lack SIMD instructions entirely, so programmers must provide non-vectorized implementations (or different vectorized implementations) for them.

Single instruction, multiple data: Difference between revisions