C++: Use local flow instead of GVN in getAdditionalFlowIntoCallNodeTerm
#12532
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…n switch statements.
…s in the same stage as 'DataFlowImplCommon'.
jketema
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Mar 15, 2023
cpp/ql/lib/semmle/code/cpp/ir/dataflow/internal/DataFlowPrivate.qll
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…al-flow-for-getAdditionalFlowIntoCallNodeTerm
jketema
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Mar 15, 2023
cpp/ql/lib/semmle/code/cpp/ir/dataflow/internal/DataFlowPrivate.qll
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jketema
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Mar 15, 2023
MathiasVP
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github:mathiasvp/replace-ast-with-ir-use-usedataflow
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This fixes a performance issue we've observed on a project, where the function was too complex for
GVNto figure out that a parameter was used in a switch statement. This meant that the performance-mitigation measure we implemented in #12236 didn't kick in.Commit-by-commit recommended. All the meat is in the first commit, and the second commit just moved things around for caching purposes.
We're losing a bunch of DCA results, but OTOH we're fixing a performance regression on a high-valued project. I'll create an internal issue to discuss how to get back some of these results.