From df4237fa224b73a08d6097ce5d642db6076d1847 Mon Sep 17 00:00:00 2001 From: Dan Gohman Date: Mon, 26 Jul 2010 18:02:06 +0000 Subject: Preserve ScalarEvolution in the loop unroller. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@109412 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/Transforms/Utils/LoopUnroll.cpp | 6 ++++++ 1 file changed, 6 insertions(+) (limited to 'lib/Transforms/Utils/LoopUnroll.cpp') diff --git a/lib/Transforms/Utils/LoopUnroll.cpp b/lib/Transforms/Utils/LoopUnroll.cpp index e0e07e7..236bbe9 100644 --- a/lib/Transforms/Utils/LoopUnroll.cpp +++ b/lib/Transforms/Utils/LoopUnroll.cpp @@ -24,6 +24,7 @@ #include "llvm/ADT/Statistic.h" #include "llvm/Analysis/ConstantFolding.h" #include "llvm/Analysis/LoopPass.h" +#include "llvm/Analysis/ScalarEvolution.h" #include "llvm/Support/Debug.h" #include "llvm/Support/raw_ostream.h" #include "llvm/Transforms/Utils/BasicBlockUtils.h" @@ -127,6 +128,11 @@ bool llvm::UnrollLoop(Loop *L, unsigned Count, LoopInfo* LI, LPPassManager* LPM) return false; } + // Notify ScalarEvolution that the loop will be substantially changed, + // if not outright eliminated. + if (ScalarEvolution *SE = LPM->getAnalysisIfAvailable()) + SE->forgetLoop(L); + // Find trip count unsigned TripCount = L->getSmallConstantTripCount(); // Find trip multiple if count is not available -- cgit v1.1