On Jun 15, 2011, at 2:04 AM, Richard Guenther wrote:
> This VIEW_CONVERT_EXPR looks useless - in fact useless_type_conversion_p
> will tell you that, so you can omit it.
So, I tracked down who created it:
tree
convert_to_vector (tree type, tree expr)
{
switch (TREE_CODE (TREE_TYPE (expr)))
{
case INTEGER_TYPE:
case VECTOR_TYPE:
if (!tree_int_cst_equal (TYPE_SIZE (type), TYPE_SIZE (TREE_TYPE (expr))))
{
error ("can%'t convert between vector values of different size");
return error_mark_node;
}
=> return build1 (VIEW_CONVERT_EXPR, type, expr);
If people want to not create useless conversions in the first place, though, I
suspect there are lots of places that create useless conversions in the
compiler.
