Generalize isSafeToSpeculativelyExecute to work on arbitrary

Values, rather than just Instructions, since it's interesting
for ConstantExprs too.

llvm-svn: 147560

2 files changed, 6 insertions, 2 deletions

diff --git a/llvm/include/llvm/Analysis/ValueTracking.h b/llvm/include/llvm/Analysis/ValueTracking.h
index 85c659c631b..300f51df372 100644
--- a/llvm/include/llvm/Analysis/ValueTracking.h
+++ b/llvm/include/llvm/Analysis/ValueTracking.h
@@ -174,7 +174,7 @@ namespace llvm {
   /// the correct dominance relationships for the operands and users hold.
   /// However, this method can return true for instructions that read memory;
   /// for such instructions, moving them may change the resulting value.
-  bool isSafeToSpeculativelyExecute(const Instruction *Inst,
+  bool isSafeToSpeculativelyExecute(const Value *V,
                                     const TargetData *TD = 0);
 
 } // end namespace llvm
diff --git a/llvm/lib/Analysis/ValueTracking.cpp b/llvm/lib/Analysis/ValueTracking.cpp
index 6de4426ab82..6cef42df9a2 100644
--- a/llvm/lib/Analysis/ValueTracking.cpp
+++ b/llvm/lib/Analysis/ValueTracking.cpp
@@ -1879,8 +1879,12 @@ bool llvm::onlyUsedByLifetimeMarkers(const Value *V) {
   return true;
 }
 
-bool llvm::isSafeToSpeculativelyExecute(const Instruction *Inst,
+bool llvm::isSafeToSpeculativelyExecute(const Value *V,
                                         const TargetData *TD) {
+  const Operator *Inst = dyn_cast<Operator>(V);
+  if (!Inst)
+    return false;
+
   for (unsigned i = 0, e = Inst->getNumOperands(); i != e; ++i)
     if (Constant *C = dyn_cast<Constant>(Inst->getOperand(i)))
       if (C->canTrap())