So, basically, you want your code to run faster. JNI is the answer. I know you said it didn’t work for you, but let me show you that you are wrong. Here’s Dot.java: import java.nio.FloatBuffer; import org.bytedeco.javacpp.*; import org.bytedeco.javacpp.annotation.*; @Platform(include = “Dot.h”, compiler = “fastfpu”) public class Dot { static { Loader.load(); } static float[] … Read more
sqrtss gives a correctly rounded result. rsqrtss gives an approximation to the reciprocal, accurate to about 11 bits. sqrtss is generating a far more accurate result, for when accuracy is required. rsqrtss exists for the cases when an approximation suffices, but speed is required. If you read Intel’s documentation, you will also find an instruction … Read more
Non-Temporal SSE instructions (MOVNTI, MOVNTQ, etc.), don’t follow the normal cache-coherency rules. Therefore non-temporal stores must be followed by an SFENCE instruction in order for their results to be seen by other processors in a timely fashion. When data is produced and not (immediately) consumed again, the fact that memory store operations read a full … Read more