[dpdk-dev] [PATCH] ixgbe: Fix clang compilation issue

[Wiles, Roger Keith]

Acked-by: Keith Wiles <keith.wiles at windiver.com>

On Sep 30, 2014, at 4:40 AM, Bruce Richardson <bruce.richardson at intel.com> wrote:

> Issue reported by Keith Wiles.
> Clang fails with an error about a variable being used uninitialized:
> 
>  CC ixgbe_rxtx_vec.o
> /home/keithw/projects/dpdk-code/org-dpdk/lib/librte_pmd_ixgbe/ixgbe_rxtx_vec.c:67:30:
> error: variable 'dma_addr0' is uninitialized
>      when used here [-Werror,-Wuninitialized]
>                        dma_addr0 = _mm_xor_si128(dma_addr0, dma_addr0);
>                                                  ^~~~~~~~~
> 
> This error can be fixed by replacing the call to xor which
> takes two parameters, by a call to setzero, which does not take any.
> 
> Signed-off-by: Bruce Richardson <bruce.richardson at intel.com>
> ---
> lib/librte_pmd_ixgbe/ixgbe_rxtx_vec.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/lib/librte_pmd_ixgbe/ixgbe_rxtx_vec.c b/lib/librte_pmd_ixgbe/ixgbe_rxtx_vec.c
> index 457f267..2236250 100644
> --- a/lib/librte_pmd_ixgbe/ixgbe_rxtx_vec.c
> +++ b/lib/librte_pmd_ixgbe/ixgbe_rxtx_vec.c
> @@ -64,7 +64,7 @@ ixgbe_rxq_rearm(struct igb_rx_queue *rxq)
> 				 RTE_IXGBE_RXQ_REARM_THRESH) < 0) {
> 		if (rxq->rxrearm_nb + RTE_IXGBE_RXQ_REARM_THRESH >=
> 		    rxq->nb_rx_desc) {
> -			dma_addr0 = _mm_xor_si128(dma_addr0, dma_addr0);
> +			dma_addr0 = _mm_setzero_si128();
> 			for (i = 0; i < RTE_IXGBE_DESCS_PER_LOOP; i++) {
> 				rxep[i].mbuf = &rxq->fake_mbuf;
> 				_mm_store_si128((__m128i *)&rxdp[i].read,
> -- 
> 1.9.3
> 

Keith Wiles, Principal Technologist with CTO office, Wind River mobile 972-213-5533