[PATCH] D64353: [AMDGPU] Run '' after isel to simplify PHIs.

Mon Jul 8 09:56:58 PDT 2019

hliao added a comment.

In D64353#1573837 <https://reviews.llvm.org/D64353#1573837>, @arsenm wrote:

> I don't follow how eliminating unreachable blocks fixes this.
>
> In general expecting code placement with the block "prolog" instructions isn't reliable. I had fixed this in rL357634 <https://reviews.llvm.org/rL357634>, except it was reverted

BTW, the flow created by CFG structurizer should not have PHI at all by design.

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https://reviews.llvm.org/D64353