[PATCH] D94905: [FuzzMutate] Add mutator to modify instruction flags.

[Florian Hahn via Phabricator via llvm-commits]

fhahn created this revision.
fhahn added reviewers: kcc, bogner, igor-laevsky.
Herald added a subscriber: hiraditya.
fhahn requested review of this revision.
Herald added a project: LLVM.

This patch adds a new InstModificationIRStrategy to mutate flags/options
for instructions. For example, it may add or remove nuw/nsw flags from
add, mul, sub, shl instructions or change the predicate for icmp
instructions.

Subtle changes such as those mentioned above should lead to a more
interesting range of inputs. The presence or absence of overflow flags
can expose subtle bugs, for example.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D94905

Files:
  llvm/include/llvm/FuzzMutate/IRMutator.h
  llvm/lib/FuzzMutate/IRMutator.cpp
  llvm/tools/llvm-opt-fuzzer/llvm-opt-fuzzer.cpp
  llvm/unittests/FuzzMutate/StrategiesTest.cpp

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