-
- // shl i32 X, 32 = 0 and srl i8 Y, 9 = 0, ... just don't eliminate
- // a signed shift.
- //
- if (Op1->uge(TypeBits)) {
- if (I.getOpcode() != Instruction::AShr)
- return ReplaceInstUsesWith(I, Constant::getNullValue(Op0->getType()));
- // ashr i32 X, 32 --> ashr i32 X, 31
- I.setOperand(1, ConstantInt::get(I.getType(), TypeBits-1));
- return &I;
- }
-