Induction variables must be phi nodes
git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@1402 91177308-0d34-0410-b5e6-96231b3b80d8
diff --git a/lib/Analysis/InductionVariable.cpp b/lib/Analysis/InductionVariable.cpp
index 706c778..b64daa2 100644
--- a/lib/Analysis/InductionVariable.cpp
+++ b/lib/Analysis/InductionVariable.cpp
@@ -59,15 +59,14 @@
// Create an induction variable for the specified value. If it is a PHI, and
// if it's recognizable, classify it and fill in instance variables.
//
-InductionVariable::InductionVariable(Instruction *V, cfg::LoopInfo *LoopInfo) {
+InductionVariable::InductionVariable(PHINode *P, cfg::LoopInfo *LoopInfo) {
InductionType = Unknown; // Assume the worst
+ Phi = P;
- // If this instruction is not a PHINode, it can't be an induction variable.
- // Also, if the PHI node has more than two predecessors, we don't know how to
+ // If the PHI node has more than two predecessors, we don't know how to
// handle it.
//
- Phi = dyn_cast<PHINode>(V);
- if (!Phi || Phi->getNumIncomingValues() != 2) return;
+ if (Phi->getNumIncomingValues() != 2) return;
// If we have loop information, make sure that this PHI node is in the header
// of a loop...