[llvm-commits] [llvm] r51933 - /llvm/trunk/lib/CodeGen/LowerSubregs.cpp

[Chris Lattner]

On Jun 4, 2008, at 2:17 AM, Evan Cheng wrote:

> Author: evancheng
> Date: Wed Jun  4 04:17:16 2008
> New Revision: 51933
>
> URL: http://llvm.org/viewvc/llvm-project?rev=51933&view=rev
> Log:
> LowerSubregs should not clobber any analysis.

Hey Evan,

Passes should only set this if they make no changes to the code at  
all.  Please just preserve the specific passes that you know are safe  
for lower subregs.

-Chris

>
>
> Modified:
>    llvm/trunk/lib/CodeGen/LowerSubregs.cpp
>
> Modified: llvm/trunk/lib/CodeGen/LowerSubregs.cpp
> URL: http://llvm.org/viewvc/llvm-project/llvm/trunk/lib/CodeGen/LowerSubregs.cpp?rev=51933&r1=51932&r2=51933&view=diff
>
> = 
> = 
> = 
> = 
> = 
> = 
> = 
> = 
> ======================================================================
> --- llvm/trunk/lib/CodeGen/LowerSubregs.cpp (original)
> +++ llvm/trunk/lib/CodeGen/LowerSubregs.cpp Wed Jun  4 04:17:16 2008
> @@ -30,6 +30,10 @@
>       return "Subregister lowering instruction pass";
>     }
>
> +    void getAnalysisUsage(AnalysisUsage &AU) const {
> +      AU.setPreservesAll();
> +    }
> +
>     /// runOnMachineFunction - pass entry point
>     bool runOnMachineFunction(MachineFunction&);
>
>
>
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