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remove some dead code

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git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@33845 91177308-0d34-0410-b5e6-96231b3b80d8
This commit is contained in:
Chris Lattner 2007-02-03 23:28:07 +00:00
parent 7ba98a9000
commit 7f3da2dd13
1 changed files with 3 additions and 14 deletions
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17
lib/Transforms/Scalar/InstructionCombining.cpp
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@ -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