Add SIMD version of harmonic bonds

[alexxy/gromacs.git] / docs / release-notes / 2021 / major / performance.rst

diff --git a/docs/release-notes/2021/major/performance.rst b/docs/release-notes/2021/major/performance.rst
index d486d0c308fea4cdfe75daac695d8d453dc39c83..b94c016d48585e286b367c96babdcd8ea25fb55b 100644 (file)
--- a/docs/release-notes/2021/major/performance.rst
+++ b/docs/release-notes/2021/major/performance.rst
@@ -25,3 +25,10 @@ Support for offloading PME to GPU when doing Coulomb FEP
 """"""""""""""""""""""""""""""""""""""""""""""""""""""""
 
 PME calculations can be offloaded to GPU when doing Coulomb free-energy perturbations.
+
+CPU SIMD accelerated implementation of harmonic bonds
+"""""""""""""""""""""""""""""""""""""""""""""""""""""
+
+SIMD acceleration for bonds slightly improves performance for systems
+with H-bonds only constrained or no constraints. This gives a significant
+improvement with multiple time stepping.