It turns out that initializing a multidimensional array with `int[][] a = new int[rows][cols]` is slower than allocating each column in a loop. Since we do a lot of large multidimensional array allocations in ML-DSA, the optimized initialization improves performance by roughly 10%.
------------- Commit messages: - Changed copyright, removed unnecessary comment - Added optimized boolean matrix allocs - Created optimized matrixAllocate method for 2d arrays Changes: https://git.openjdk.org/jdk/pull/23642/files Webrev: https://webrevs.openjdk.org/?repo=jdk&pr=23642&range=00 Issue: https://bugs.openjdk.org/browse/JDK-8347606 Stats: 56 lines in 1 file changed: 23 ins; 1 del; 32 mod Patch: https://git.openjdk.org/jdk/pull/23642.diff Fetch: git fetch https://git.openjdk.org/jdk.git pull/23642/head:pull/23642 PR: https://git.openjdk.org/jdk/pull/23642
