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| author | David Brazdil <dbrazdil@google.com> | 2015-04-20 14:52:42 +0100 |
|---|---|---|
| committer | David Brazdil <dbrazdil@google.com> | 2015-04-24 16:19:31 +0100 |
| commit | 2d7352ba5311b8f57427b91b7a891e61497373c1 (patch) | |
| tree | 3f3426f4f30663ee252ebc1f02ecd0eb114bad85 /compiler/optimizing/boolean_simplifier.cc | |
| parent | c5cb691ca6a746a193bfbe3525aafa7cbb281d40 (diff) | |
| download | art-2d7352ba5311b8f57427b91b7a891e61497373c1.tar.gz art-2d7352ba5311b8f57427b91b7a891e61497373c1.tar.bz2 art-2d7352ba5311b8f57427b91b7a891e61497373c1.zip | |
ART: Dead block removal
Adds a new pass which finds all unreachable blocks, typically due to
simplifying an if-condition to a constant, and removes them from the
graph. The patch also slightly generalizes the graph-transforming
operations.
Change-Id: Iff7c97f1d10b52886f3cd7401689ebe1bfdbf456
Diffstat (limited to 'compiler/optimizing/boolean_simplifier.cc')
| -rw-r--r-- | compiler/optimizing/boolean_simplifier.cc | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/compiler/optimizing/boolean_simplifier.cc b/compiler/optimizing/boolean_simplifier.cc index 6ebfb45074..30c89f2d15 100644 --- a/compiler/optimizing/boolean_simplifier.cc +++ b/compiler/optimizing/boolean_simplifier.cc @@ -120,8 +120,11 @@ void HBooleanSimplifier::Run() { phi->ReplaceWith(replacement); merge_block->RemovePhi(phi); - // Link the start/end blocks and remove empty branches. - graph_->MergeEmptyBranches(block, merge_block); + // Delete the true branch and merge the resulting chain of blocks + // 'block->false_block->merge_block' into one. + true_block->DisconnectAndDelete(); + block->MergeWith(false_block); + block->MergeWith(merge_block); // Remove the original condition if it is now unused. if (!if_condition->HasUses()) { |