[PATCH] D58637: [LegalizeDAG] Expand SADDO/SSUBO using SADDSAT/SSUBSAT (PR37763)

[Simon Pilgrim via Phabricator via llvm-commits]

RKSimon created this revision.
RKSimon added reviewers: nikic, spatel.
Herald added a subscriber: jdoerfert.
Herald added a project: LLVM.

If SADDSAT/SSUBSAT are legal, then we can expand SADDO/SSUBO by performing a ADD/SUB and a SADDO/SSUBO and then compare the results.

I looked at doing this for UADDO/USUBO as well but as we don't have to do as many range comparisons I didn't see any/much benefit.


Repository:
  rL LLVM

https://reviews.llvm.org/D58637

Files:
  lib/CodeGen/SelectionDAG/LegalizeDAG.cpp
  test/CodeGen/X86/vec_saddo.ll
  test/CodeGen/X86/vec_ssubo.ll

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