[PATCH] D143521: [llvm][LowerConstantIntrinsics] add debug statements

[Nick Desaulniers via Phabricator via llvm-commits]

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These can help us better understand what __builtin_constant_p and
__builtin_object_size get folded to.

$ clang -mllvm -debug-only=lower-is-constant-intrinsic ...


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D143521

Files:
  llvm/lib/Transforms/Scalar/LowerConstantIntrinsics.cpp


Index: llvm/lib/Transforms/Scalar/LowerConstantIntrinsics.cpp
===================================================================
--- llvm/lib/Transforms/Scalar/LowerConstantIntrinsics.cpp
+++ llvm/lib/Transforms/Scalar/LowerConstantIntrinsics.cpp
@@ -29,6 +29,7 @@
 #include "llvm/IR/PatternMatch.h"
 #include "llvm/InitializePasses.h"
 #include "llvm/Pass.h"
+#include "llvm/Support/Debug.h"
 #include "llvm/Transforms/Scalar.h"
 #include "llvm/Transforms/Utils/Local.h"
 #include <optional>
@@ -136,10 +137,12 @@
       continue;
     case Intrinsic::is_constant:
       NewValue = lowerIsConstantIntrinsic(II);
+      LLVM_DEBUG(dbgs() << "Folding " << *II << " to " << *NewValue << "\n");
       IsConstantIntrinsicsHandled++;
       break;
     case Intrinsic::objectsize:
       NewValue = lowerObjectSizeCall(II, DL, &TLI, true);
+      LLVM_DEBUG(dbgs() << "Folding " << *II << " to " << *NewValue << "\n");
       ObjectSizeIntrinsicsHandled++;
       break;
     }


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