[PATCH] D149640: [clang][dataflow] Change PruneTriviallyFalseEdges for building CFG

[Kinuko Yasuda via Phabricator via cfe-commits]

kinu created this revision.
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It looks like keeping this false could end up with extra iterations
on a lot of loops that aren't real ones (e.g. they could be a
do-while-false for macros).

This patch changes the default for
CFG::BuildOptions.PruneTriviallyFalseEdges to true to avoid it.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D149640

Files:
  clang/lib/Analysis/FlowSensitive/ControlFlowContext.cpp


Index: clang/lib/Analysis/FlowSensitive/ControlFlowContext.cpp
===================================================================
--- clang/lib/Analysis/FlowSensitive/ControlFlowContext.cpp
+++ clang/lib/Analysis/FlowSensitive/ControlFlowContext.cpp
@@ -70,7 +70,7 @@
 llvm::Expected<ControlFlowContext>
 ControlFlowContext::build(const Decl *D, Stmt &S, ASTContext &C) {
   CFG::BuildOptions Options;
-  Options.PruneTriviallyFalseEdges = false;
+  Options.PruneTriviallyFalseEdges = true;
   Options.AddImplicitDtors = true;
   Options.AddTemporaryDtors = true;
   Options.AddInitializers = true;


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