[Beignet] [PATCH] Restore jump threading pass for reducing compiling time when run the large and complex kernel like Luxmark.

[Yang, Rong R]

LGTM, pushed, thanks.

> -----Original Message-----
> From: Beignet [mailto:beignet-bounces at lists.freedesktop.org] On Behalf Of
> yan.wang at linux.intel.com
> Sent: Friday, December 9, 2016 14:50
> To: beignet at lists.freedesktop.org
> Cc: Yan Wang <yan.wang at linux.intel.com>
> Subject: [Beignet] [PATCH] Restore jump threading pass for reducing
> compiling time when run the large and complex kernel like Luxmark.
> 
> From: Yan Wang <yan.wang at linux.intel.com>
> 
> Jump threading pass could optimize the connection between LLVM basic
> blocks of the function and provide the chance to merge and remove
> unnecessary basic blocks to reduce the compilation time and ASM code size.
> 
> Signed-off-by: Yan Wang <yan.wang at linux.intel.com>
> ---
>  backend/src/llvm/llvm_to_gen.cpp | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/backend/src/llvm/llvm_to_gen.cpp
> b/backend/src/llvm/llvm_to_gen.cpp
> index 42f24b3..e108810 100644
> --- a/backend/src/llvm/llvm_to_gen.cpp
> +++ b/backend/src/llvm/llvm_to_gen.cpp
> @@ -214,7 +214,7 @@ namespace gbe
>      // Run instcombine after redundancy elimination to exploit opportunities
>      // opened up by them.
>      MPM.add(createInstructionCombiningPass());
> -    //MPM.add(createJumpThreadingPass());         // Thread jumps
> +    MPM.add(createJumpThreadingPass());         // Thread jumps
>      MPM.add(createCorrelatedValuePropagationPass());
>      MPM.add(createDeadStoreEliminationPass());  // Delete dead stores
>      MPM.add(createAggressiveDCEPass());         // Delete dead instructions
> --
> 2.7.4
> 
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