1 files changed, 3 insertions, 2 deletions
diff --git a/llvm/lib/Target/X86/X86TargetMachine.h b/llvm/lib/Target/X86/X86TargetMachine.h
index c16207973b3..617cec26567 100644
--- a/llvm/lib/Target/X86/X86TargetMachine.h
+++ b/llvm/lib/Target/X86/X86TargetMachine.h
@@ -40,8 +40,9 @@ public:
   ~X86TargetMachine() override;
 
   const X86Subtarget *getSubtargetImpl(const Function &F) const override;
-  // The no argument getSubtargetImpl, while it exists on some targets, is
-  // deprecated and should not be used.
+  // DO NOT IMPLEMENT: There is no such thing as a valid default subtarget,
+  // subtargets are per-function entities based on the target-specific
+  // attributes of each function.
   const X86Subtarget *getSubtargetImpl() const = delete;
 
   TargetIRAnalysis getTargetIRAnalysis() override;