+section: compiler

+synopsis: Introduce a cache of home module name providers

+issues: #27055

+mrs: !15888

+description: {

+    This contribution optimizes the algorithm for finding out which home

+    unit provides the module that a certain import declaration refers

+    to. The previous approach has been to simply search all home units

+    in no particular order. This change introduces a cache that allows

+    for efficiently determining those complete home units that provide a

+    certain module name and changes the module-finding algorithm such

+    that it searches these units before the other home units. This leads

+    to significant performance improvements in situations where there

+    are lots of home units.

+}