When we check for similarity, right now there is no order to how it is checked, except for via the suffix tree ordering.
We can reduce how much structural analysis we perform by checking the the regions in decreasing size. In doing so, we know that if two large sections match, each of their contained regions also match. This allows us to skip the structural checking for each smaller section. IT does require that we use the large regions as a "bridge" to create the canonical mapping between the two regions.
This reduces compile time significantly for some benchmarks. It will not perform as well for programs with many small items.
Recommit fixes the IRSimilarity tests.
Recommit of: 805ec19d7d9915989be8a8a626176b5e29e19eee
Recommit fixes llvm-sim tests
Recommit of: 082ec267583100455fee356bb0d4ebd55aba2d46
Reviewer: paquette
Differential Revision: https://reviews.llvm.org/D139338
When we check for similarity, right now there is no order to how it is checked, except for via the suffix tree ordering.
We can reduce how much structural analysis we perform by checking the the regions in decreasing size. In doing so, we know that if two large sections match, each of their contained regions also match. This allows us to skip the structural checking for each smaller section. IT does require that we use the large regions as a "bridge" to create the canonical mapping between the two regions.
This reduces compile time significantly for some benchmarks. It will not perform as well for programs with many small items.
Recommit fixes the IRSimilarity tests.
Recommit of: 805ec19d7d9915989be8a8a626176b5e29e19eee
Reviewer: paquette
Differential Revision: https://reviews.llvm.org/D139338
The current IRSimilarityIdentifier does not try to find similarity across blocks, this patch provides a mechanism to compare two branches against one another, to find similarity across basic blocks, rather than just within them.
This adds a step in the similarity identification process that labels all of the basic blocks so that we can identify the relative branching locations. Within an IRSimilarityCandidate we use these relative locations to determine whether if the branching to other relative locations in the same region is the same between branches. If they are, we consider them similar.
We do not consider the relative location of the branch if the target branch is outside of the region. In this case, both branches must exit to a location outside the region, but the exact relative location does not matter.
Reviewers: paquette, yroux
Differential Revision: https://reviews.llvm.org/D106989
When doing some recent debugging of the IROutliner, and using the similarity pass for debugging, just having the basic block and function isn't really enough to get all the information. This adds the first and last instruction to the output of the IRSimilarityPrinting pass to give better information to a user.
Reviewer: paquette
Differential Revision: https://reviews.llvm.org/D94304
This introduces an analysis pass that wraps IRSimilarityIdentifier,
and adds a printer pass to examine in what function similarities are
being found.
Test for what the printer pass can find are in
test/Analysis/IRSimilarityIdentifier.
Reviewed by: paquette, jroelofs
Differential Revision: https://reviews.llvm.org/D86973
