[Beignet] [patch v2] don't merge serial blocks with barrier.

[Song, Ruiling]

LGTM
We need to remove the limitation that barrier block could not be enclosed in structured block.

> -----Original Message-----
> From: Beignet [mailto:beignet-bounces at lists.freedesktop.org] On Behalf Of
> xionghu.luo at intel.com
> Sent: Tuesday, June 30, 2015 10:37 AM
> To: beignet at lists.freedesktop.org
> Cc: Luo, Xionghu
> Subject: [Beignet] [patch v2] don't merge serial blocks with barrier.
> 
> From: Luo Xionghu <xionghu.luo at intel.com>
> 
> this could fix the piglit and opencv fail on IVB_x86 platform.
> 1) opencv_test_core/OCL_Arithm/CountNonZero
> 2) opencv_test_core/OCL_Arithm/MeanStdDev
> 3) piglit case program/execute/atomic_cmpxchg-local.
> v2: update comments: As our barrier implementation doen't support
> structured barrier operation, exclude all the barrier blocks from
> serialPatternMatch.
> 
> Signed-off-by: Luo Xionghu <xionghu.luo at intel.com>
> ---
>  backend/src/ir/structurizer.cpp | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/backend/src/ir/structurizer.cpp b/backend/src/ir/structurizer.cpp
> index cb8e11b..82bb56b 100644
> --- a/backend/src/ir/structurizer.cpp
> +++ b/backend/src/ir/structurizer.cpp
> @@ -738,7 +738,9 @@ namespace ir {
>        return 0;
> 
>      Block *childBlk = *block->succ_begin();
> -    if (childBlk->pred_size() != 1 )
> +    //FIXME, As our barrier implementation doen't support structured
> barrier
> +    //operation, exclude all the barrier blocks from serialPatternMatch.
> +    if (childBlk->pred_size() != 1 || childBlk->hasBarrier() )
>        return 0;
> 
>      BlockList serialBBs;//childBBs
> --
> 1.9.1
> 
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