Techniques
An example would be a program to multiply two vectors of numeric data. A scalar approach would be something like:
for (i = 0; i < 1024; i++) C = A*B;This could be vectorized to look something like:
for (i = 0; i < 1024; i+=4) C = A*B;Here, C represents the four array elements from C to C and the vector processor can perform four operations for a single vector instruction. Since the four vector operations complete in roughly the same time like one scalar instruction, the vector approach can run up to four times faster than the original code.
There are two distinct compiler approaches: one based on conventional vectorization technique and the other based on loop unrolling.
Read more about this topic: Vectorization (parallel Computing)
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