[PATCH] D78191: [GlobalISel] Fix invalid combine of unmerge(merge) with intermediate cast

Wed Apr 15 11:30:30 PDT 2020

arsenm added a comment.

In D78191#1984088 <https://reviews.llvm.org/D78191#1984088>, @gargaroff wrote:

> Unfortunately this caused the build bots to fail due to the sanitizers flagging undefined behavior in the AMDGPUInstructionSelector and I have reverted the commit for now. @arsenm Do you think this patch should wait until the bug in the InstructionSelector is fixed? Or should this patch include a fix? I have not looked into the problem yet, so I cannot say what goes wrong exactly.

I'm assuming this is hitting a null dereference due to the missing 192-bit register class

Repository:
  rG LLVM Github Monorepo

CHANGES SINCE LAST ACTION
  https://reviews.llvm.org/D78191/new/

https://reviews.llvm.org/D78191