[LLVMdev] Instruction Cleanup Questions

[Hal Finkel]

On Thu, 7 Jun 2012 00:57:20 -0700
Chandler Carruth <chandlerc at google.com> wrote:

> On Wed, Jun 6, 2012 at 10:37 PM, Hal Finkel <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
> >
> > 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?

Chandler,

Thanks for the pointer! It turns out that this was a problem only in
the context of a local modification (and I could fix it by fixing
AnalyzeBranch and friends). That triggered other problems, but that's
another story...

 -Hal

-- 
Hal Finkel
Postdoctoral Appointee
Leadership Computing Facility
Argonne National Laboratory