Re: [PATCH v3] lib/fib: remove warning about implicit 64-bit conversion

[Stephen Hemminger <stephen@networkplumber.org>]

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Better to cast the constant (1) to avoid warning,
.
That is what other code does like RTE_BIT macros

On Mon, Mar 3, 2025, 23:55 Andre Muezerie <andremue@linux.microsoft.com>
wrote:

> MSVC issues the warning below:
>
> ../lib/fib/trie.c(341): warning C4334: '<<':
> result of 32-bit shift implicitly converted to 64 bits
> (was 64-bit shift intended?)
>
> The fix is to cast the result explicitly to uintptr_t since it is used
> in pointer arithmetic.
>
> Signed-off-by: Andre Muezerie <andremue@linux.microsoft.com>
> ---
>  lib/fib/trie.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/lib/fib/trie.c b/lib/fib/trie.c
> index 4893f6c636..bf9f63eaa2 100644
> --- a/lib/fib/trie.c
> +++ b/lib/fib/trie.c
> @@ -338,7 +338,7 @@ write_edge(struct rte_trie_tbl *dp, const uint8_t
> *ip_part, uint64_t next_hop,
>                 if (ret < 0)
>                         return ret;
>                 if (edge == LEDGE) {
> -                       write_to_dp((uint8_t *)p + (1 << dp->nh_sz),
> +                       write_to_dp((uint8_t *)p + (uintptr_t)(1 <<
> dp->nh_sz),
>                                 next_hop << 1, dp->nh_sz, UINT8_MAX -
> *ip_part);
>                 } else {
>                         write_to_dp(get_tbl_p_by_idx(dp->tbl8, tbl8_idx *
> --
> 2.48.1.vfs.0.0
>
>

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