The following reduces the number of object files that need to be rebuilt after match.pd has been modified. Right now a change to match.pd which adds/removes a line almost always forces recompilation of all files that genmatch generates from it. This is because of unnecessary changes to the generated .cc files:
1. Function names and ordering change as does the way the functions are distributed across multiple source files. 2. Code locations from match.pd are quoted directly (including line numbers) by logging fprintf calls. This patch addresses the those issues without changing the behaviour of the generated code. The first one is solved by making sure that minor changes to match.pd do not influence the order in which functions are generated. The second one by using a lookup table with line numbers. Now a change to a single function will trigger a rebuild of 4 object files (one with the function and the one with the lookup table both for gimple and generic) instead all of them (20 by default). For reference, this decreased the rebuild time with 48 threads from 3.5 minutes to 1.5 minutes on my machine. Note for reviewers: I do not have write access. Andrzej Turko (3): Support get_or_insert in ordered_hash_map genmatch: Reduce variability of generated code genmatch: Log line numbers indirectly gcc/Makefile.in | 4 +- gcc/genmatch.cc | 76 ++++++++++++++++++++++++++++++----- gcc/ordered-hash-map-tests.cc | 19 +++++++-- gcc/ordered-hash-map.h | 26 ++++++++++++ 4 files changed, 110 insertions(+), 15 deletions(-) -- 2.34.1