[PATCH] D73288: [InstCombine] Move negation handling into freelyNegateValue()

[Nikita Popov via Phabricator via llvm-commits]

nikic created this revision.
nikic added reviewers: spatel, lebedev.ri, xbolva00.
Herald added subscribers: llvm-commits, hiraditya.
Herald added a project: LLVM.

Followup to D72978 <https://reviews.llvm.org/D72978>. This moves existing negation handling in InstCombine into freelyNegateValue(), which make it more composable. In particular, the negations of div/zext/sext can now be applied across a `shl`, rather than just for direct negations.

The next step is to add multiply support to fix https://bugs.llvm.org/show_bug.cgi?id=44234.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D73288

Files:
  llvm/lib/Transforms/InstCombine/InstCombineAddSub.cpp
  llvm/lib/Transforms/InstCombine/InstructionCombining.cpp
  llvm/test/Transforms/InstCombine/sub.ll

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