From 43ef3fbae12c7924a25df4563d86084973db9c67 Mon Sep 17 00:00:00 2001
From: Dan Gohman <gohman@apple.com>
Date: Tue, 20 Jul 2010 17:18:52 +0000
Subject: [PATCH] Remember that the induction variable is always a PHINode and
 use getIncomingValueForBlock instead of
 LoopInfo::getCanonicalInductionVariableIncrement.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@108865 91177308-0d34-0410-b5e6-96231b3b80d8
---
 lib/Transforms/Scalar/IndVarSimplify.cpp | 8 ++++----
 1 file changed, 4 insertions(+), 4 deletions(-)

diff --git a/lib/Transforms/Scalar/IndVarSimplify.cpp b/lib/Transforms/Scalar/IndVarSimplify.cpp
index b5c9dd881df..03fb40d5b62 100644
--- a/lib/Transforms/Scalar/IndVarSimplify.cpp
+++ b/lib/Transforms/Scalar/IndVarSimplify.cpp
@@ -102,7 +102,7 @@ namespace {
     void RewriteNonIntegerIVs(Loop *L);
 
     ICmpInst *LinearFunctionTestReplace(Loop *L, const SCEV *BackedgeTakenCount,
-                                   Value *IndVar,
+                                   PHINode *IndVar,
                                    BasicBlock *ExitingBlock,
                                    BranchInst *BI,
                                    SCEVExpander &Rewriter);
@@ -131,7 +131,7 @@ Pass *llvm::createIndVarSimplifyPass() {
 /// is actually a much broader range than just linear tests.
 ICmpInst *IndVarSimplify::LinearFunctionTestReplace(Loop *L,
                                    const SCEV *BackedgeTakenCount,
-                                   Value *IndVar,
+                                   PHINode *IndVar,
                                    BasicBlock *ExitingBlock,
                                    BranchInst *BI,
                                    SCEVExpander &Rewriter) {
@@ -181,7 +181,7 @@ ICmpInst *IndVarSimplify::LinearFunctionTestReplace(Loop *L,
     // The BackedgeTaken expression contains the number of times that the
     // backedge branches to the loop header.  This is one less than the
     // number of times the loop executes, so use the incremented indvar.
-    CmpIndVar = L->getCanonicalInductionVariableIncrement();
+    CmpIndVar = IndVar->getIncomingValueForBlock(ExitingBlock);
   } else {
     // We have to use the preincremented value...
     RHS = SE->getTruncateOrZeroExtend(BackedgeTakenCount,
@@ -534,7 +534,7 @@ bool IndVarSimplify::runOnLoop(Loop *L, LPPassManager &LPM) {
 
   // Now that we know the largest of the induction variable expressions
   // in this loop, insert a canonical induction variable of the largest size.
-  Value *IndVar = 0;
+  PHINode *IndVar = 0;
   if (NeedCannIV) {
     // Check to see if the loop already has any canonical-looking induction
     // variables. If any are present and wider than the planned canonical