Add forms of dominates and isReachableFromEntry that accept a Use

directly instead of a user Instruction. This allows them to test
whether a def dominates a particular operand if the user instruction
is a PHI.


git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@154631 91177308-0d34-0410-b5e6-96231b3b80d8

1 files changed, 3 insertions, 0 deletions

diff --git a/include/llvm/Analysis/Dominators.h b/include/llvm/Analysis/Dominators.h
index 372465a054..6e8e424636 100644
--- a/include/llvm/Analysis/Dominators.h
+++ b/include/llvm/Analysis/Dominators.h
@@ -775,6 +775,7 @@ public:
   // dominates - Return true if Def dominates a use in User. This performs
   // the special checks necessary if Def and User are in the same basic block.
   // Note that Def doesn't dominate a use in Def itself!
+  bool dominates(const Instruction *Def, const Use &U) const;
   bool dominates(const Instruction *Def, const Instruction *User) const;
   bool dominates(const Instruction *Def, const BasicBlock *BB) const;
 
@@ -843,6 +844,8 @@ public:
     return DT->isReachableFromEntry(A);
   }
 
+  bool isReachableFromEntry(const Use &U) const;
+
 
   virtual void releaseMemory() {
     DT->releaseMemory();