tree bd912465afd5ec2651517a9b4c503a365802e502
parent 1abe9cb79d8001992f1c79ba5e638e6b423a1382
author Matthias Boehm <mboehm7@gmail.com> 1593901485 +0200
committer Matthias Boehm <mboehm7@gmail.com> 1593901485 +0200

[SYSTEMDS-419] Performance lineage-based reuse (partial rewrites)

This patch makes a minor performance improvement to the important
partial rewrite tsmm(cbind(X,v)) to tsmm(X) + compensation plan, by
avoiding cbind(X, v)[,1:n-1] to extract X if X is still available in the
lineage cache. This avoids unnecessary allocation and copies.