Open source projects are starting to capitalise on fast new intrinsics available in Java 9. For instance, Lucene is already experimenting with `Arrays.mismatch`

, which I… 2,818 more words

## Tags » JMH

#### Eliminating Bounds Checks with Intrinsics in Java 9

#### How much Algebra does C2 Know? Part 1: Associativity

Making loops execute faster is firmly rooted in algebra, but how much does C2 know or care about? When building a highly optimised query engine, a critical concern is the quality of assembly code generated for loops. 2,564 more words

#### Zeroing Negative Values in Arrays Efficiently

Replacing negatives with zeroes in large arrays of values is a primitive function of several complex financial risk measures, including potential future exposure (PFE) and the liquidity coverage ratio (LCR). 2,735 more words

#### Yell'O

**Yell’O and welcome friends and soon to be friends. This here is State & Main OK and my name is ****Jenny Mae Harms****. Yep that’s right, I go by two names, just stare at the picture to the left and think about the sounds of fiddles and banjos and you’ll be say’n it just about right. ** 161 more words

#### Still True in Java 9: Handwritten Hash Codes are Faster

557 more wordsUpdate 05/09/2017: I have recently discovered that this phenomenon was first described by Alexey Shipilev on an OpenJDK ticket in 2014. As Alexey notes, this is due to the strength reduction of a multiplication by 31 to a shift and a subtraction, which creates a data dependency preventing an unroll.

#### New Methods in Java 9: Math.fma and Arrays.mismatch

There are two noteworthy new methods in Java 9: `Arrays.mismatch`

and `Math.fma`

.

This method takes two primitive arrays, and returns the index of the first differing values. 1,271 more words

#### Choosing the Right Radix: Measurement or Mathematics?

I recently wrote a post about radix sorting, and found that for large arrays of unsigned integers a handwritten implementation beats `Arrays.sort`

. However, I paid no attention to the choice of radix and used a default of eight bits. 532 more words