[DCE] Port -redundant-dbg-inst-elim to NPM

This is used to test RemoveRedundantDbgInstrs(), which is used by other passes. Reviewed By: ychen Differential Revision: https://reviews.llvm.org/D91477
llvm · Nov 15, 2020 · 6e04da0 · 6e04da0
1 parent 23cc838
commit 6e04da0
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diff --git a/llvm/include/llvm/Transforms/Scalar/DCE.h b/llvm/include/llvm/Transforms/Scalar/DCE.h
@@ -23,6 +23,12 @@ class DCEPass : public PassInfoMixin<DCEPass> {
 public:
   PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM);
 };
+
+class RedundantDbgInstEliminationPass
+    : public PassInfoMixin<RedundantDbgInstEliminationPass> {
+public:
+  PreservedAnalyses run(Function &F, FunctionAnalysisManager &AM);
+};
 }
 
 #endif // LLVM_TRANSFORMS_SCALAR_DCE_H
diff --git a/llvm/lib/Passes/PassRegistry.def b/llvm/lib/Passes/PassRegistry.def
@@ -285,6 +285,7 @@ FUNCTION_PASS("print-alias-sets", AliasSetsPrinterPass(dbgs()))
 FUNCTION_PASS("print-predicateinfo", PredicateInfoPrinterPass(dbgs()))
 FUNCTION_PASS("print-mustexecute", MustExecutePrinterPass(dbgs()))
 FUNCTION_PASS("reassociate", ReassociatePass())
+FUNCTION_PASS("redundant-dbg-inst-elim", RedundantDbgInstEliminationPass())
 FUNCTION_PASS("reg2mem", RegToMemPass())
 FUNCTION_PASS("scalarizer", ScalarizerPass())
 FUNCTION_PASS("separate-const-offset-from-gep", SeparateConstOffsetFromGEPPass())

diff --git a/llvm/lib/Transforms/Scalar/DCE.cpp b/llvm/lib/Transforms/Scalar/DCE.cpp
@@ -69,6 +69,18 @@ Pass *llvm::createRedundantDbgInstEliminationPass() {
   return new RedundantDbgInstElimination();
 }
 
+PreservedAnalyses
+RedundantDbgInstEliminationPass::run(Function &F, FunctionAnalysisManager &AM) {
+  bool Changed = false;
+  for (auto &BB : F)
+    Changed |= RemoveRedundantDbgInstrs(&BB);
+  if (!Changed)
+    return PreservedAnalyses::all();
+  PreservedAnalyses PA;
+  PA.preserveSet<CFGAnalyses>();
+  return PA;
+}
+
 //===--------------------------------------------------------------------===//
 // DeadCodeElimination pass implementation
 //

diff --git a/llvm/test/Transforms/DCE/dbg-value-removal.ll b/llvm/test/Transforms/DCE/dbg-value-removal.ll
@@ -1,5 +1,6 @@
 ; NOTE: Assertions have been autogenerated by utils/update_test_checks.py
 ; RUN: opt < %s -S -redundant-dbg-inst-elim | FileCheck %s
+; RUN: opt < %s -S -passes=redundant-dbg-inst-elim | FileCheck %s
 
 ; All dbg.value with location "!dbg !19" are redundant in the input.
 ; FIXME: We do not handle non-overlapping/overlapping fragments perfectly yet.