[llvm-bugs] [Bug 11364] Peephole pass should remove dead code

[via llvm-bugs]

https://bugs.llvm.org/show_bug.cgi?id=11364

Sjoerd Meijer <sjoerd.meijer at arm.com> changed:

           What    |Removed                     |Added
----------------------------------------------------------------------------
                 CC|                            |sjoerd.meijer at arm.com
         Resolution|---                         |FIXED
             Status|NEW                         |RESOLVED

--- Comment #2 from Sjoerd Meijer <sjoerd.meijer at arm.com> ---
the peepholer now understands this case, e.g.:

  -- RewriteSource
     Replacing: %3:gpr = VMOVRS %1:spr, 14, $noreg
          With: %4:gpr = COPY %0:gpr

and 

  DeadMachineInstructionElim: DELETING: %1:spr = VMOVSR %0:gpr, 14, $noreg


Test case peephole-bitcast.ll was XFAIL'ed, which I have enabled in commit:

https://github.com/llvm/llvm-project/commit/20a1d03d778dedaa91cbf8ff63d4be92c2291ca0

will close this PR.

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