[PATCH] D107285: [FPEnv][InstSimplify] Enable more folds for constrained fsub

[Kevin P. Neal via Phabricator via llvm-commits]

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Currently there are optimizations for the fsub instruction that do not fire for a constrained fsub. Add some of these optimizations.

Optimizations that require teaching the IR matchers about the constrained intrinsics are for a future patch.


Repository:
  rG LLVM Github Monorepo

https://reviews.llvm.org/D107285

Files:
  llvm/lib/Analysis/InstructionSimplify.cpp
  llvm/test/Transforms/InstSimplify/strictfp-fsub.ll

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