[llvm] r194373 - [NVPTX] Blacklist TailDuplicate pass

[Tom Stellard]

On Mon, Nov 11, 2013 at 12:58:14PM -0000, Justin Holewinski wrote:
> Author: jholewinski
> Date: Mon Nov 11 06:58:14 2013
> New Revision: 194373
> 
> URL: http://llvm.org/viewvc/llvm-project?rev=194373&view=rev
> Log:
> [NVPTX] Blacklist TailDuplicate pass
> 
> This causes issues with virtual registers.  We will likely need
> to fix TailDuplicate in the future, or introduce a new version
> that plays nicely with vregs.
> 

Do you have a testcase to demonstrate what TailDuplicate was doing
wrong?  It would be great if you could file a bug for this.

-Tom

> Modified:
>     llvm/trunk/lib/Target/NVPTX/NVPTXTargetMachine.cpp
> 
> Modified: llvm/trunk/lib/Target/NVPTX/NVPTXTargetMachine.cpp
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/Target/NVPTX/NVPTXTargetMachine.cpp?rev=194373&r1=194372&r2=194373&view=diff
> ==============================================================================
> --- llvm/trunk/lib/Target/NVPTX/NVPTXTargetMachine.cpp (original)
> +++ llvm/trunk/lib/Target/NVPTX/NVPTXTargetMachine.cpp Mon Nov 11 06:58:14 2013
> @@ -126,6 +126,7 @@ void NVPTXPassConfig::addIRPasses() {
>    disablePass(&PrologEpilogCodeInserterID);
>    disablePass(&MachineCopyPropagationID);
>    disablePass(&BranchFolderPassID);
> +  disablePass(&TailDuplicateID);
>  
>    TargetPassConfig::addIRPasses();
>    addPass(createGenericToNVVMPass());
> 
> 
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