[PM] Teach the optimization remarks emitter to handle invalidation

events.

This pass sometimes has a pointer to BlockFrequencyInfo so it needs
custom invalidation logic. It is also otherwise immutable so we can
reduce the number of invalidations that happen substantially.

llvm-svn: 292058

1 files changed, 12 insertions, 0 deletions

diff --git a/llvm/lib/Analysis/OptimizationDiagnosticInfo.cpp b/llvm/lib/Analysis/OptimizationDiagnosticInfo.cpp
index fa8b07d61b0..da4e11d4303 100644
--- a/llvm/lib/Analysis/OptimizationDiagnosticInfo.cpp
+++ b/llvm/lib/Analysis/OptimizationDiagnosticInfo.cpp
@@ -45,6 +45,18 @@ OptimizationRemarkEmitter::OptimizationRemarkEmitter(Function *F)
   BFI = OwnedBFI.get();
 }
 
+bool OptimizationRemarkEmitter::invalidate(
+    Function &F, const PreservedAnalyses &PA,
+    FunctionAnalysisManager::Invalidator &Inv) {
+  // This analysis has no state and so can be trivially preserved but it needs
+  // a fresh view of BFI if it was constructed with one.
+  if (BFI && Inv.invalidate<BlockFrequencyAnalysis>(F, PA))
+    return true;
+
+  // Otherwise this analysis result remains valid.
+  return false;
+}
+
 Optional<uint64_t> OptimizationRemarkEmitter::computeHotness(const Value *V) {
   if (!BFI)
     return None;