commit 617d108a639b29015da2dbf0e54f61bd39c3c33c
author Dale Johannesen <dalej@apple.com> Mon Apr 27 21:03:15 2009 +0000
committer Dale Johannesen <dalej@apple.com> Mon Apr 27 21:03:15 2009 +0000
tree 621e829cbbf7509d9e627df3dea446d2a5254d12
parent c45288e06bfe7d0b0e74eff350d280fa6c944373

Fix PR 4086, a bug in FP IV elimination.



git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@70247 91177308-0d34-0410-b5e6-96231b3b80d8

lib/Transforms/Scalar/IndVarSimplify.cpp

diff --git a/lib/Transforms/Scalar/IndVarSimplify.cpp b/lib/Transforms/Scalar/IndVarSimplify.cpp
index cc3919d..141b118 100644
--- a/lib/Transforms/Scalar/IndVarSimplify.cpp
+++ b/lib/Transforms/Scalar/IndVarSimplify.cpp
@@ -1037,9 +1037,11 @@
                                             Incr->getName()+".int", Incr);
   NewPHI->addIncoming(NewAdd, PH->getIncomingBlock(BackEdge));
 
+  // The back edge is edge 1 of newPHI, whatever it may have been in the
+  // original PHI.
   ConstantInt *NewEV = ConstantInt::get(Type::Int32Ty, intEV);
-  Value *LHS = (EVIndex == 1 ? NewPHI->getIncomingValue(BackEdge) : NewEV);
-  Value *RHS = (EVIndex == 1 ? NewEV : NewPHI->getIncomingValue(BackEdge));
+  Value *LHS = (EVIndex == 1 ? NewPHI->getIncomingValue(1) : NewEV);
+  Value *RHS = (EVIndex == 1 ? NewEV : NewPHI->getIncomingValue(1));
   ICmpInst *NewEC = new ICmpInst(NewPred, LHS, RHS, EC->getNameStart(),
                                  EC->getParent()->getTerminator());