> During the development of a patch I encountered some strange behavior
> and decided to investigate. The result of which is I think I found a bug
> with 'wide_int_storage::set_len' in gcc/wide-int.h.
>
> The function reads:
> inline void
> wide_int_storage::set_len (unsigned int l, bool is_sign_extended)
> {
> len = l;
> if (!is_sign_extended && len * HOST_BITS_PER_WIDE_INT > precision)
> val[len - 1] = sext_hwi (val[len - 1],
> precision % HOST_BITS_PER_WIDE_INT);
> }
The code certainly lacks a comment explaining the apparent discrepancy.
> Due to this, 'expand_expr' will expand a constant tree with unsigned
> integer type and value MAX_UINT to a rtx node (const_int -1).
As Jakub explained, that is as expected, even if a little surprising.
--
Eric Botcazou
