[PATCH] D60061: [InstCombine] ssubo X, C -> saddo X, -C

[Dan Robertson via Phabricator via llvm-commits]

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

ssubo X, C is equivalent to saddo X, -C. Make the transformation in
InstCombine and allow the logic implemented for saddo to fold prior
usages of `add nsw` or `sub nsw` with constants.


https://reviews.llvm.org/D60061

Files:
  llvm/lib/Transforms/InstCombine/InstCombineCalls.cpp
  llvm/test/Transforms/InstCombine/ssub-with-overflow.ll

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