What is Vectorization?
Transforming a loop that performs the same computation on each element so that SIMD instructions process several elements at once. It requires no data dependence between iterations.
Field: Compilers
Vectorization in the explanations
Automatic vectorization finds loops that perform the same computation on each array element and replaces them with SIMD instructions that process several elements at once.
Which kind of instruction does a compiler's automatic vecto…Vectorization computes, say, four elements at once with one SIMD instruction.
Why is the loop above hard to vectorize with SIMD instructi…Compilers with strict settings therefore preserve the order; choosing settings that tolerate differences (such as fast-math options) may allow reordering for vectorization.
Why does a compiler with strict settings not reorder the fl…
Questions that mention Vectorization (4)
- Which kind of instruction does a compiler's automatic vectorization use?
- Why is the loop above hard to vectorize with SIMD instructions?
- Why does a compiler with strict settings not reorder the floating-point sum (a + b) + c into a + (b + c) on its own?
- For a loop that sums only the x coordinates as above, why does converting to a structure of arrays (a separate array per field) tend to be faster?
Related terms
SIMD Interrupt Abstract syntax tree Basic block Common subexpression elimination Constant folding Control-flow graph Function inlining Instruction scheduling Intermediate representation