[LLVMdev] Machine dependent dead-instruction elimination

[Evan Cheng]

On Mar 23, 2009, at 11:48 AM, Villmow, Micah wrote:

> I have a pass that modifies my machine dependent instructions and I  
> have ran into a situation where I want to remove all instructions  
> that an instruction is dependent on when I remove an instruction.
> Is there a way to do this using the API calls?

No. See DeadMachineInstructionElim.cpp.

Evan

>
> For example, I have a sequence of instructions
> a = b + c
> d = c * c
> store d, *a
> load e, *a
> f = e + d
>
>
> since the store and load are pointless I want to turn them into a  
> simple move turning the code into
> a = b + c
> d = c * c
> tmp = d
> e = tmp
> f = e + d
>
> however I also want to remove the `a = b + c` instruction.
>
> Any idea’s?
>
> Thanks,
>
> Micah Villmow
> Systems Engineer
> Advanced Technology & Performance
> Advanced Micro Devices Inc.
> S1-609 One AMD Place
> Sunnyvale, CA. 94085
> P: 408-749-3966
>
>
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