capypad
0 day streak
java / expert
Snippet

Vector API for Data-Parallel Operations

The Vector API allows the JVM to perform SIMD (Single Instruction, Multiple Data) operations. This expert-level feature leverages hardware-level parallelism on modern CPUs to process multiple data points in a single cycle, significantly boosting performance for mathematical computations.

snippet.java
java
1
2
3
4
5
6
7
8
9
static final VectorSpecies<Float> SPECIES = FloatVector.SPECIES_PREFERRED;
 
void compute(float[] a, float[] b, float[] res) {
for (int i = 0; i < a.length; i += SPECIES.length()) {
var va = FloatVector.fromArray(SPECIES, a, i);
var vb = FloatVector.fromArray(SPECIES, b, i);
va.add(vb).intoArray(res, i);
}
}
Breakdown
1
static final VectorSpecies<Float> SPECIES = FloatVector.SPECIES_PREFERRED;
Determines the optimal vector size for the current hardware architecture.
2
va.add(vb).intoArray(res, i);
Performs a parallel addition of multiple elements simultaneously.