Disable most IR-level transform passes on functions marked 'optnone'.

Ideally only those transform passes that run at -O0 remain enabled,
in reality we get as close as we reasonably can.
Passes are responsible for disabling themselves, it's not the job of
the pass manager to do it for them.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@200892 91177308-0d34-0410-b5e6-96231b3b80d8

2 files changed, 15 insertions, 0 deletions

diff --git a/include/llvm/Analysis/LoopPass.h b/include/llvm/Analysis/LoopPass.h
index 5926610d1a..9ca55053f5 100644
--- a/include/llvm/Analysis/LoopPass.h
+++ b/include/llvm/Analysis/LoopPass.h
@@ -81,6 +81,11 @@ public:
 
   /// deleteAnalysisValue - Delete analysis info associated with value V.
   virtual void deleteAnalysisValue(Value *V, Loop *L) {}
+
+protected:
+  /// skipOptnoneFunction - Containing function has Attribute::OptimizeNone
+  /// and most transformation passes should skip it.
+  bool skipOptnoneFunction(Loop *L) const;
 };
 
 class LPPassManager : public FunctionPass, public PMDataManager {
diff --git a/include/llvm/Pass.h b/include/llvm/Pass.h
index 35ec022516..e16144397c 100644
--- a/include/llvm/Pass.h
+++ b/include/llvm/Pass.h
@@ -307,6 +307,11 @@ public:
 
   ///  Return what kind of Pass Manager can manage this pass.
   virtual PassManagerType getPotentialPassManagerType() const;
+
+protected:
+  /// skipOptnoneFunction - This function has Attribute::OptimizeNone
+  /// and most transformation passes should skip it.
+  bool skipOptnoneFunction(Function &F) const;
 };
 
 
@@ -351,6 +356,11 @@ public:
 
   ///  Return what kind of Pass Manager can manage this pass.
   virtual PassManagerType getPotentialPassManagerType() const;
+
+protected:
+  /// skipOptnoneFunction - Containing function has Attribute::OptimizeNone
+  /// and most transformation passes should skip it.
+  bool skipOptnoneFunction(BasicBlock &BB) const;
 };
 
 /// If the user specifies the -time-passes argument on an LLVM tool command line