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

[Matt Arsenault via Phabricator via llvm-commits]

arsenm added a comment.

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



================
Comment at: llvm/test/CodeGen/AMDGPU/lcssa-optnone.ll:1-3
+; RUN: llc -march=amdgcn -O0 -o - %s | FileCheck %s
+
+; CHECK-LABEL: non_uniform_loop
----------------
Generate check lines


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  https://reviews.llvm.org/D64353/new/

https://reviews.llvm.org/D64353