[PATCH] D50756: AMDGPU: Improve extract_vector_elt reduction combine

[Matt Arsenault via Phabricator via llvm-commits]

arsenm created this revision.
arsenm added reviewers: FarhanaAleen, rampitec.
Herald added subscribers: t-tye, tpr, dstuttard, yaxunl, nhaehnle, wdng, kzhuravl.

Handle fmul, fsub and preserve flags.

      

Also really test minnum/maxnum reductions.
The existing tests were only checking from
minnum/maxnum matched from a fast math compare
 and select which is not the same.


https://reviews.llvm.org/D50756

Files:
  lib/Target/AMDGPU/SIISelLowering.cpp
  test/CodeGen/AMDGPU/reduction.ll

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