[LLVMdev] Instruction Cleanup Questions

[Ivan Llopard]

Hi Hal,

On 07/06/2012 09:57, Chandler Carruth wrote:
> On Wed, Jun 6, 2012 at 10:37 PM, Hal Finkel <hfinkel at anl.gov 
> <mailto:hfinkel at anl.gov>> wrote:
>
>     I am working on cleaning up some PPC code generation. Two questions:
>
>     1. Which pass is responsible for cleaning up self-moves:
>       0x00000000100057c0 <+208>:   mr      r3,r3
>

and the RA should eliminate trivial copies.

>
>     2. Which pass is responsible for cleaning up unconditional jumps that
>     should be fall-throughs:
>       0x0000000010005d88 <+1688>:  b       0x10005d8c <._Z11sfoo+1692>
>       0x0000000010005d8c <+1692>:  ld r3,-32056(r2)
>
>
> This should be handled by the MachineBlockPlacement (among others). Do 
> you have a reduced est case?
>
>
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