From 7f3da2dd13d2c420c22800845486ba5971e37eb0 Mon Sep 17 00:00:00 2001 From: Chris Lattner Date: Sat, 3 Feb 2007 23:28:07 +0000 Subject: [PATCH] remove some dead code git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@33845 91177308-0d34-0410-b5e6-96231b3b80d8 --- lib/Transforms/Scalar/InstructionCombining.cpp | 17 +++-------------- 1 file changed, 3 insertions(+), 14 deletions(-) diff --git a/lib/Transforms/Scalar/InstructionCombining.cpp b/lib/Transforms/Scalar/InstructionCombining.cpp index 8f3675299c7..49a17750478 100644 --- a/lib/Transforms/Scalar/InstructionCombining.cpp +++ b/lib/Transforms/Scalar/InstructionCombining.cpp @@ -5624,25 +5624,14 @@ Instruction *InstCombiner::FoldShiftByConstant(Value *Op0, ConstantInt *Op1, unsigned ShiftAmt2 = (unsigned)Op1->getZExtValue(); // Check for (A << c1) << c2 and (A >> c1) >> c2. - if (isLeftShift == isShiftOfLeftShift) { - // Do not fold these shifts if the first one is signed and the second one - // is unsigned and this is a right shift. Further, don't do any folding - // on them. - if (isShiftOfSignedShift && isUnsignedShift && !isLeftShift) - return 0; - + if (I.getOpcode() == ShiftOp->getOpcode()) { unsigned Amt = ShiftAmt1+ShiftAmt2; // Fold into one big shift. if (Amt > Op0->getType()->getPrimitiveSizeInBits()) Amt = Op0->getType()->getPrimitiveSizeInBits(); Value *Op = ShiftOp->getOperand(0); - BinaryOperator *ShiftResult = - BinaryOperator::create(I.getOpcode(), Op, - ConstantInt::get(Op->getType(), Amt)); - if (I.getType() == ShiftResult->getType()) - return ShiftResult; - InsertNewInstBefore(ShiftResult, I); - return CastInst::create(Instruction::BitCast, ShiftResult, I.getType()); + return BinaryOperator::create(I.getOpcode(), Op, + ConstantInt::get(Op->getType(), Amt)); } // Check for (A << c1) >> c2 or (A >> c1) << c2. If we are dealing with