[dpdk-dev] ixgbe: Fix clang compilation issue

  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@intel.com>
---
 lib/librte_pmd_ixgbe/ixgbe_rxtx_vec.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)
  

Self-nak, resent old patch.

> -----Original Message-----
> From: Richardson, Bruce
> Sent: Wednesday, October 22, 2014 11:54 AM
> To: dev@dpdk.org
> Cc: Richardson, Bruce
> Subject: [PATCH] ixgbe: Fix clang compilation issue
> 
> 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@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