From 05fecbe42e835b30274a7b38af27687a8abbd114 Mon Sep 17 00:00:00 2001 From: Andrew Trick Date: Mon, 26 Mar 2012 20:28:37 +0000 Subject: LSR ivchain bug fix: corner case with ConstantExpr. Fixes PR11950. git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@153463 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/Transforms/Scalar/LoopStrengthReduce.cpp | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) (limited to 'lib/Transforms') diff --git a/lib/Transforms/Scalar/LoopStrengthReduce.cpp b/lib/Transforms/Scalar/LoopStrengthReduce.cpp index f2112446ad..7e71683dc1 100644 --- a/lib/Transforms/Scalar/LoopStrengthReduce.cpp +++ b/lib/Transforms/Scalar/LoopStrengthReduce.cpp @@ -704,8 +704,9 @@ static bool isHighCostExpansion(const SCEV *S, Value *UVal = U->getValue(); for (Value::use_iterator UI = UVal->use_begin(), UE = UVal->use_end(); UI != UE; ++UI) { - Instruction *User = cast(*UI); - if (User->getOpcode() == Instruction::Mul + // If U is a constant, it may be used by a ConstantExpr. + Instruction *User = dyn_cast(*UI); + if (User && User->getOpcode() == Instruction::Mul && SE.isSCEVable(User->getType())) { return SE.getSCEV(User) == Mul; } -- cgit v1.2.3