[pedroclobo]

The following crashes Alive2 (https://alive2.llvm.org/ce/z/K86YU9):

define <1 x ptr> @src(ptr %p, ptr %v) {
  store ptr %v, ptr %p
  %l = load <1 x ptr>, ptr %p
  ret <1 x ptr> %l
}

define <1 x ptr> @tgt(ptr %p, ptr %v) {
  store ptr %v, ptr %p
  %l = bitcast ptr %v to <1 x ptr>
  ret <1 x ptr> %l
}

; Severe Z3 error: sort is not a bit-vector [code=3]

ConversionOp::toSMT treats every bitcast to a vector of pointers as a no-op, returning the operand unchanged. That holds for <N x ptr> -> <N x ptr>, but not for ptr -> <1 x ptr>.

This can be avoided by taking the shortcut only when the source is also a vector:

-    if (getType().isVectorType() &&
+    if (getType().isVectorType() && val->getType().isVectorType() &&
         getType().getAsAggregateType()->getChild(0).isPtrType())
       return v;

Found while working on llvm/llvm-project#235505.