[PATCH] D63709: [AMDGPU] Add peephole to optimize MOV

Tue Jun 25 08:51:45 PDT 2019

piotr added a comment.

In D63709#1557626 <https://reviews.llvm.org/D63709#1557626>, @arsenm wrote:

> In D63709#1557605 <https://reviews.llvm.org/D63709#1557605>, @arsenm wrote:
>
> > In D63709#1557592 <https://reviews.llvm.org/D63709#1557592>, @arsenm wrote:
> >
> > > Reduced further: https://paste.debian.net/1089194
> >
> >
> > Other targets seem to not have this problem with a slightly generalized version, so I would look into how this is cleaned up there
>
>
> It seems we're missing a simplifycfg run somewhere, so maybe we're thinking of this on the wrong level entirely.. If I run simplify cfg on any of the testcase variants, this problem disappears

Well spotted, I will try to look at the issue from the perspective of missing simplifycfg.

Repository:
  rL LLVM

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D63709/new/

https://reviews.llvm.org/D63709